Cement testing

Devices and methods for testing cement include: a pressure vessel with a sample container inside an interior working volume of the pressure vessel, the pressure vessel configured to supply a first pressurized fluid to control a pore pressure of a cement sample and to supply a second pressurized fluid to lateral exterior surfaces of the sample container to provide a confining pressure that can be different than the pore pressure.

Cement compositions comprising particulate foamed elastomers and associated methods

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid. In one embodiment, the particulate foamed elastomer may comprise polyurethane foam.

DRILLING PERFORMANCE OPTIMIZATION WITH EXTREMUM SEEKING

A drilling optimization method including perturbing one or more drilling control parameters with a periodic or a stochastic signal during a drilling process, estimating at least one drilling performance measure to optimize the drilling process based on the perturbed one or more drilling control parameters, perturbing the at least one drilling performance measure with a periodic or a stochastic perturbation source through demodulation, determine a next best estimate of the one or more drilling control parameters to optimize the at least one drilling performance measure, perturbing the next best estimate by a periodic or a stochastic perturbation source through modulation, and feeding the perturbation next best estimates of the one or more drilling control parameters back to the drilling process. 1. A method comprising:perturbing a drilling control parameter with a periodic or a stochastic signal during a drilling process;estimating or calculating a drilling performance measure to optimize the drilling process based on the perturbation of the drilling control parameter;perturbing the drilling performance measure by multiplying the drilling performance measure with a periodic or a stochastic perturbation source through demodulation;determining a next best estimate of the drilling control parameter to optimize the drilling performance measure;perturbing the next best estimate by a periodic or a stochastic perturbation source through modulation; andfeeding the perturbed next best estimate of the drilling control parameters to the drilling process.2. The method of claim 1 , further comprising feeding the drilling performance measure through a high-pass filter.3. The method of claim 1 , further comprising feeding the perturbed drilling performance measure through a low-pass filter.4. The method of claim 1 , wherein determining the next best estimate comprises integrating a gradient to calculate the next best estimate.5. The method of claim 1 , wherein feeding next best ...

Cement Testing

Devices and methods for testing cement include: a pressure vessel with a sample container inside an interior working volume of the pressure vessel, the pressure vessel configured to supply a first pressurized fluid to control a pore pressure of a cement sample and to supply a second pressurized fluid to lateral exterior surfaces of the sample container to provide a confining pressure that can be different than the pore pressure. 113-. (canceled)14. A method of testing a cement , the method comprising: controlling pore pressure in a cement sample inside a sample container disposed in a pressure vessel of a testing apparatus while the cement sample is curing to provide a first pressure in the cement sample; and simultaneouslycontrolling a confining pressure applied to lateral exterior surfaces of the sample container to provide a second pressure that can be different than the first pressure.15. The method of claim 14 , further comprising:mixing a slurry of the cement sample at pressure conditions that are different than ambient pressure conditions; andtransferring the slurry of the cement sample to the sample container for curing without exposure to ambient pressure conditions.16. The method of claim 14 , further comprising:selecting end caps of the sample container based on tests to be performed;assembling the sample container by attaching the end caps to opposite ends of a substantially tubular sleeve which is more flexible than the end caps; andfilling the sample container with slurry.17. The method of claim 14 , further comprising:simultaneously setting initial pressure conditions in multiple testing apparatuses;isolating at least one of the testing apparatuses from others of the multiple testing apparatuses; andtesting a mechanical property of cement sample(s) in the at least one of the testing apparatuses isolated from others of the multiple testing apparatuses.18. The method of claim 17 , further comprising calculating a failure mode for the cement being tested ...

PROBABILISTIC MODEL CALIBRATION AND ESTIMATION FOR DRILLING STEERING CONTROL

A method for calibrating a steering model may comprise estimating an initial condition for one or more variables in the steering model and calibrating the steering model with a Markov Chain Monte Carlo Simulation (MCMC). A drilling system may comprise a bottom hole assembly, a drill string connected to the bottom hole assembly, and an information handling system connected to the bottom hole assembly. The information handling system may be configured to process one or more measurements from the bottom hole assembly, calibrate a steering model based at least in part on the one or more measurements, adjust a control logic based at least in part on the steering model, and adjust the bottom hole assembly based at least in part on the control logic. 1. A method for calibrating a steering model comprising:estimating an initial condition for one or more variables in the steering model; andcalibrating the steering model with a Markov Chain Monte Carlo Simulation (MCMC).2. The method of further comprising estimating a measurement uncertainty based at least in part on the one or more variables.3. The method of further comprising updating a prior probability distribution for the one or more variables based at least in part on one or more posterior probabilities.4. The method of claim 1 , further comprising calculating a probability distribution for the one or more variables in the steering model.5. The method of claim 4 , further comprising fitting the one or more variables to the steering model by minimizing an objective function.6. The method of claim 5 , further comprising performing a sum of squares of the objective function.7. The method of claim 1 , further comprising identifying a window at an initial depth for the estimating the initial condition.8. The method of claim 7 , further comprising selecting a random sample of measurements.9. The method of claim 8 , further comprising performing a least-squares linear fit on the random sample of measurements.10. The method of ...

PROSPECTIVE KICK LOSS DETECTION FOR OFF-SHORE DRILLING

Certain aspects and features relate to a system that monitors for kick and lost circulation in the riser string of an offshore drilling rig. The system compensates for annulus outflow fluctuation induced by wave (heave) motion in order to reduce false alarms, resulting in fewer drilling operation disruptions. The system includes a sensor or sensors disposable with respect to a drilling rig subject to rig motion. A processor receives a real-time position signal indicative of the rig motion from the sensor and applies a state observer to the position signal to determine annular flow parameters. The system models an annular flow for the wellbore to produce a modeled flow signal that reflects a position of the drilling rig relative to influx flow. The system uses the modeled flow to determine kick-loss-alarm parameters that take into account the heave motion. 1. A system comprising:at least one sensor disposable with respect to a drilling rig subject to rig motion;a processor communicatively coupled to the at least one sensor; and receiving, in real time from the at least one sensor, a position signal indicative of the rig motion;', 'applying a state observer to the position signal to determine annular flow parameters;', 'modeling an annular flow for a wellbore associated with the drilling rig to produce a modeled flow signal based on the annular flow parameters, the modeled flow signal reflecting a position of the drilling rig relative to influx flow;', 'determining kick-loss-alarm parameters from the modeled flow signal; and', 'applying the kick-loss-alarm parameters to an alarm module., 'a non-transitory memory device comprising instructions that are executable by the processor to cause the processor to perform operations comprising2. The system of claim 1 , wherein the at least one sensor comprises a heave motion sensor and the rig motion comprises wave-induced rig motion.3. The system of claim 1 , wherein the operation of modeling the annular flow further comprises ...

CEMENT COMPOSITIONS COMPRISING PARTICULATE FOAMED ELASTOMERS AND ASSOCIATED METHODS

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the methods comprise introducing a cement composition into a subterranean location, wherein the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid; and allowing the cement composition to set in the subterranean location. 1. A method of cementing , comprising: a hydraulic cement,', 'a particulate foamed elastomer, and', 'an aqueous fluid; and, 'introducing a cement composition into a subterranean location, wherein the cement composition comprisesallowing the cement composition to set in the subterranean location.2. The method of wherein the particulate foamed elastomer comprises polyurethane foam.3. The method of wherein the particulate foamed elastomer comprises a foamed swellable elastomer.4. The method of wherein the particulate foamed elastomer comprises at least one foamed oil-swellable elastomer selected from the group consisting of ethylene propylene diene M-class rubber claim 1 , polyamide claim 1 , polypropylene claim 1 , polyethylene claim 1 , styrene butadiene claim 1 , styrene claim 1 , divinylbenzene claim 1 , natural rubber claim 1 , acrylate butadiene rubber claim 1 , polyacrylate rubber claim 1 , isoprene rubber claim 1 , chloroprene rubber claim 1 , butyl rubber claim 1 , brominated butyl rubber claim 1 , chlorinated butyl rubber claim 1 , chlorinated polyethylene claim 1 , neoprene rubber claim 1 , styrene butadiene copolymer rubber claim 1 , sulphonated polyethylene claim 1 , ethylene acrylate rubber claim 1 , epichlorohydrin ethylene oxide copolymer claim 1 , ethylene-propylene rubber claim 1 , ethylene-propylene-diene terpolymer rubber claim 1 , ethylene vinyl acetate copolymer claim 1 , fluorosilicone rubbers claim 1 , silicone rubbers claim 1 , poly 2 claim 1 ,2 claim 1 ,1-bicyclo heptene (polynorborneane) claim 1 , alkylstyrene claim 1 ...

SLIDE-ROTATE RATIO MODE OPTIMIZATION FOR MUD MOTOR TRAJECTORY CONTROL

Aspects of the subject technology relate to systems and methods for improving mud motor trajectory controls. Systems and methods are provided for receiving control data from a mud motor trajectory controller, predefining a plurality of control modes based on the control data from the mud motor trajectory controller, achieving desired slide rotate ratios and toolface angles by solving an established objective function that mathematically represents operational preferences and system constraints for a selected control mode of the plurality of control modes, generating a modulation procedure that converts the slide-rotate ratios to a binary slide and rotate control sequence, and applying the modulation procedure to generate the binary slide and rotate control sequence. 1. A method comprising:receiving control data from a mud motor trajectory controller;predefining a plurality of control modes based on the control data from the mud motor trajectory controller;achieving desired slide rotate ratios and toolface angles by solving an established objective function that mathematically represents operational preferences and system constraints for a selected control mode of the plurality of control modes;generating a modulation procedure that converts the slide-rotate ratios to a binary slide and rotate control sequence; andapplying the modulation procedure to generate the binary slide and rotate control sequence.2. The method of claim 1 , wherein the mud motor trajectory controller is a model predictive control system.3. The method of claim 1 , wherein the control data includes curvature demands for subsequent drilling operations.4. The method of claim 1 , wherein the plurality of control modes includes a plurality of settings having respective continuous slide and rotate lengths.5. The method of claim 1 , further comprising providing the modulation procedure to at least one of advisory display and an automatic closed loop trajectory control system.6. The method of claim 1 , ...

Cement compositions comprising particulate foamed elastomers and associated methods

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid. In one embodiment, the particulate foamed elastomer may comprise polyurethane foam.

Cement testing

Devices and methods for testing cement include: a pressure vessel with a sample container inside an interior working volume of the pressure vessel, the pressure vessel configured to supply a first pressurized fluid to control a pore pressure of a cement sample and to supply a second pressurized fluid to lateral exterior surfaces of the sample container to provide a confining pressure that can be different than the pore pressure.

Cement testing

Devices and methods for testing cement include: a pressure vessel with a sample container inside an interior working volume of the pressure vessel, the pressure vessel configured to supply a first pressurized fluid to control a pore pressure of a cement sample and to supply a second pressurized fluid to lateral exterior surfaces of the sample container to provide a confining pressure that can be different than the pore pressure.

Cement Compositions Comprising Particulate Foamed Elastomers and Associated Methods

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the methods comprise introducing a cement composition into a subterranean location, wherein the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid; and allowing the cement composition to set in the subterranean location. In one embodiment, the particulate foamed elastomer may comprise polyurethane foam.

Cement compositions comprising particulate foamed elastomers and associated methods

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the methods comprise introducing a cement composition into a subterranean location, wherein the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid; and allowing the cement composition to set in the subterranean location. In one embodiment, the particulate foamed elastomer may comprise polyurethane foam.

Cement compositions comprising particulate foamed elastomers and associated methods

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the methods comprise introducing a cement composition into a subterranean location, wherein the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid; and allowing the cement composition to set in the subterranean location.

cement testing system, method and device

sistema, método e dispositivo para testar cimento. dispositivios e métodos para testar cimento incluem: u mvaso de pressão com um recipiente de amostra dentro de um volume de trabalho interno do vaso de pressão, o vaso de pressão configurado para suprir um primeiro fluido pressurizado para controlar uma pressão de poro de uma amostra de ciemnto e para suprir um segundo fluido pressurizado nas superfícies externas laterais do recipiente de amostra para prover uma pressão de confinamento que possa ser diferente do que a pressão de poro. system, method and device for testing cement. Cement testing devices and methods include: a pressure vessel with a sample vessel within an internal workload of the pressure vessel, the pressure vessel configured to supply a first pressurized fluid to control a pore pressure of a sample of and to supply a second pressurized fluid to the outer side surfaces of the sample container to provide a confining pressure that may be different than the pore pressure.

Cement compositions comprising particulate foamed elastomers and associated methods

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the methods comprise introducing a cement composition into a subterranean location, wherein the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid; and allowing the cement composition to set in the subterranean location. In one embodiment, the particulate foamed elastomer may comprise polyurethane foam.

cementation method and cement composition

Cement compositions comprising particulate foamed elastomers and associated methods

Methods of subterranean cementing involving cement compositions comprising particulate foamed elastomers and associated methods are provided. In one embodiment, the methods comprise introducing a cement composition into a subterranean location, wherein the cement composition comprises a hydraulic cement, a particulate foamed elastomer, and an aqueous fluid; and allowing the cement composition to set in the subterranean location. In one embodiment, the particulate foamed elastomer may comprise polyurethane foam.

System to Correlate Suitable Slurry Designs with Petrophysical While-Drilling Measurements in Real Time

A method of designing a cement blend for a wellbore isolation barrier from datasets indicative of drilling a wellbore. The drilling datasets may include drilling equipment data, bottom hole assembly data, and mud system data. A drilling path record comprising depth segments with averaged data values of drilling data can be generated by processing the drilling datasets. A design process can determine a stress state for each depth segment of the drilling path record and design a cement blend with mechanical properties exceeding the stress state. The design process can determine an optimized cement design comprising the cement blend for each depth segment of the drilling path record.

Prospective kick loss detection for off-shore drilling

Real-time automated geosteering interpretation using adaptive combined heatmaps

An intuitive automated geosteering interpretation method and system that creates a geological model of a subterranean formation using an adaptive combined heatmap is provided. The adaptive combined heatmap is generated from individual heatmaps that each correspond to a specific type of drilling data (e.g. sensor readings) and then combined with adaptive weightings. An example of an automated method of drilling a target well using a well plan, includes: (1) generating at least two individual heatmaps for a subterranean formation using target well drilling data from a target well and offset well data from at least one offset well, wherein each of the individual heatmaps correspond to a specific type of drilling data, (2) generating an adaptive combined heatmap from the individual heatmaps, (3) determining a path of the target well in the subterranean formation based on the adaptive combined heatmap, and (4) updating the well plan according to the path.

Prospective kick loss detection for off-shore drilling

Automated vertical-curve-lateral drilling

A method may include dividing a wellplan into one or more section using a section detection algorithm, receiving a depth measurement of a drill bit or a bottom hole assembly located in a wellbore, utilizing the section detection algorithm and the depth measurement to identify a section of the wellplan from the one or more sections of the wellplan, and identifying a target based at least in part on the identified section. The method may further include determining one or more steering commands based at least in part on the target and a control algorithm and steering the bottom hole assembly to the target using the one or more steering commands.

Detection of potential geological control points with logging-while-drilling sensors

A geosteering subsystem has been designed to detect patterns in measurements that correlate to geological events. A geological event may correspond to a potential control point that geosteering operations may use to make geosteering decisions. The subsystem evaluates obtained measurements against predetermined patterns that correlate to geological events. When a pattern is detected in the measurements, the subsystem labels the depth and corresponding formation property measurements as a potential control point. Once detected, the subsystem can pass on the potential control point for interpretation using various methods such as manual interpretation, performed by a human operator, and automatic interpretation,performed by geosteering software.

Real-time automated geosteering interpretation using adaptive combined heatmaps

An intuitive automated geosteering interpretation method and system that creates a geological model of a subterranean formation using an adaptive combined heatmap is provided. The adaptive combined heatmap is generated from individual heatmaps that each correspond to a specific type of drilling data (e.g. sensor readings) and then combined with adaptive weightings. An example of an automated method of drilling a target well using a well plan, includes: (1) generating at least two individual heatmaps for a subterranean formation using target well drilling data from a target well and offset well data from at least one offset well, wherein each of the individual heatmaps correspond to a specific type of drilling data, (2) generating an adaptive combined heatmap from the individual heatmaps, (3) determining a path of the target well in the subterranean formation based on the adaptive combined heatmap, and (4) updating the well plan according to the path.

Detection of potential geological control points with logging-while-drilling sensors

A geosteering subsystem has been designed to detect patterns in measurements that correlate to geological events. A geological event may correspond to a potential control point that geosteering operations may use to make geosteering decisions. The subsystem evaluates obtained measurements against predetermined patterns that correlate to geological events. When a pattern is detected in the measurements, the subsystem labels the depth and corresponding formation property measurements as a potential control point. Once detected, the subsystem can pass on the potential control point for interpretation using various methods such as manual interpretation, performed by a human operator, and automatic interpretation, performed by geosteering software.

Probabilistic model calibration and estimation for drilling steering control

Increasing drilling accuracy while increasing drilling rates

Robust linear parameter varying control design for automated curvature cruise

A computer-implemented method for drilling a curve section of a wellbore in a subsurface formation. The method comprises obtaining a curvature setpoint. The method comprises obtaining drilling process feedback from a drilling assembly drilling the curve section of the wellbore. The method comprises updating a scheduling parameter vector based on the drilling process feedback. The method comprises updating a controller, wherein the controller is configured with the scheduling parameter vector. The method comprises determining an error based on the curvature setpoint and the drilling process feedback. The method comprises inputting the error into the controller. The method comprises determining, via the controller, steering decisions based on the error and the scheduling parameter vector.

Robust linear parameter varying control design for automated curvature cruise

A computer-implemented method for drilling a curve section of a wellbore in a subsurface formation. The method comprises obtaining a curvature setpoint. The method comprises obtaining drilling process feedback from a drilling assembly drilling the curve section of the wellbore. The method comprises updating a scheduling parameter vector based on the drilling process feedback. The method comprises updating a controller, wherein the controller is configured with the scheduling parameter vector. The method comprises determining an error based on the curvature setpoint and the drilling process feedback. The method comprises inputting the error into the controller. The method comprises determining, via the controller, steering decisions based on the error and the scheduling parameter vector.

Real-time automated geosteering interpretation using adaptive combined heatmaps

Calibração e estimativa de modelo probabilístico para controle de direção de perfuração

calibração e estimativa de modelo probabilístico para controle de direção de perfuração. um método para calibrar um modelo de direção pode incluir estimar uma condição inicial para uma ou mais variáveis no modelo de direção e calibrar o modelo de direção com uma simulação de monte carlo de cadeia de markov (mcmc). um sistema de perfuração pode compreender uma composição de fundo de poço, uma coluna de perfuração conectada à composição de fundo de poço e um sistema de manipulação de informações conectado à composição de fundo de poço. o sistema de manipulação de informações pode ser configurado para processar uma ou mais medições da composição de fundo, calibrar um modelo de orientação com base, pelo menos em parte, em uma ou mais medições, ajustar uma lógica de controle com base, pelo menos em parte, no modelo de orientação e ajustar a composição de fundo com base,pelo menos em parte, na lógica de controle.

Prediction based pump-off detection

Pump-off detection, and actions to avert a pump-off event from occurring, are described that may be implemented in a wireline control system while performing a pump-down operation to position a downhole tool within a wellbore. As part of the pump-down operation, the downhole tool is attached to a wireline coupling the tool to a wireline control device located at the surface above the wellbore.

Prediction based pump-off detection

Pump-off detection, and actions to avert a pump-off event from occurring, are described that may be implemented in a wireline control system while performing a pump-down operation to position a downhole tool within a wellbore. As part of the pump-down operation, the downhole tool is attached to a wireline coupling the tool to a wireline control device located at the surface above the wellbore.

Prospective kick loss detection for off-shore drilling

Certain aspects and features relate to a system that monitors for kick and lost circulation in the riser string of an offshore drilling rig. The system compensates for annulus outflow fluctuation induced by wave (heave) motion in order to reduce false alarms, resulting in fewer drilling operation disruptions. The system includes a sensor or sensors disposable with respect to a drilling rig subject to rig motion. A processor receives a real-time position signal indicative of the rig motion from the sensor and applies a state observer to the position signal to determine annular flow parameters. The system models an annular flow for the wellbore to produce a modeled flow signal that reflects a position of the drilling rig relative to influx flow. The system uses the modeled flow to determine kick-loss-alarm parameters that take into account the heave motion.

Slide-rotate ratio mode optimization for mud motor trajectory control

Automated vertical-curve-lateral drilling

Probabilistic model calibration and estimation for drilling steering control

Probabilistic model calibration and estimation for drilling steering control

A method for calibrating a steering model may comprise estimating an initial condition for one or more variables in the steering model and calibrating the steering model with a Markov Chain Monte Carlo Simulation (MCMC). A drilling system may comprise a bottom hole assembly, a drill string connected to the bottom hole assembly, and an information handling system connected to the bottom hole assembly. The information handling system may be configured to process one or more measurements from the bottom hole assembly, calibrate a steering model based at least in part on the one or more measurements, adjust a control logic based at least in part on the steering model, and adjust the bottom hole assembly based at least in part on the control logic.

System to correlate suitable slurry designs with petrophysical while-drilling measurements in real time

Probabilistic model calibration and estimation for drilling steering control

A method for calibrating a steering model may comprise estimating an initial condition for one or more variables in the steering model and calibrating the steering model with a Markov Chain Monte Carlo Simulation (MCMC). A drilling system may comprise a bottom hole assembly, a drill string connected to the bottom hole assembly, and an information handling system connected to the bottom hole assembly. The information handling system may be configured to process one or more measurements from the bottom hole assembly, calibrate a steering model based at least in part on the one or more measurements, adjust a control logic based at least in part on the steering model, and adjust the bottom hole assembly based at least in part on the control logic.

Techniques for calibrating borehole propagation model for direction drilling in real time

Current disclosure proposes calibration methodology that uses the knowledge learned from historical data and real-time data to update a simplified physics-based borehole propagation model for real time steering control of a directional drilling system. The proposed methodology updates model parameters of the simplified physics-based model in real time through a process of setting up and optimizing an objective function, which indicates the difference between the estimated trajectory and the feedback from the real-time data. Penalizing terms, which prevent the parameters from deviating drastically from the prior knowledge of the parameter, and various components of the objective function are learned from the historical data. As a result, the updated model can accurately estimate and predict the system behavior allowing an input sequence of the system to be accurately mapped to the output response.

Sistema, método e meio legível por computador não transitório

SISTEMA, MÉTODO E MEIO LEGÍVEL POR COMPUTADOR NÃO TRANSITÓRIO. Certos aspectos e características estão relacionados a um sistema que monitora o kick e a circulação perdida na coluna do riser de uma plataforma de perfuração offshore. O sistema compensa a flutuação do fluxo de saída do anular induzida pelo movimento das ondas (elevação) para reduzir os alarmes falsos, resultando em menos interrupções na operação de perfuração. O sistema inclui um sensor ou sensores implantáveis em relação a uma plataforma de perfuração sujeita ao movimento da plataforma. Um processador recebe um sinal de posição em tempo real indicativo do movimento da plataforma do sensor e aplica um observador de estado ao sinal de posição para determinar os parâmetros de fluxo anular. O sistema modela um fluxo anular para o furo de poço para produzir um sinal de fluxo modelado que reflete uma posição da plataforma de perfuração em relação ao fluxo de influxo. O sistema usa o fluxo modelado para determinar os parâmetros de alarme de perda de kick que levam em consideração o movimento de elevação.

Error-space feedback controller for drill bit steering

A variety of methods, systems, and apparatus are disclosed, including, in one embodiment a method of steering a drilling bit including: determining at least one control command to a drilling system, wherein the control command includes a combination of one or more nominal control commands output from a feedforward controller and one or more control command error values output from a feedback controller operating in an error space; and directing the drill bit of the drilling system in the wellbore based on at least the control command to extend the wellbore towards a planned depth-based wellbore trajectory.

A model-based curvature cruise control design

A curvature cruise controller has been designed to maintain a desired curvature when drilling a curve section of a wellbore. The curvature cruise controller utilizes a model-based controller (such as an LQR controller) to generate steering inputs based on the desired curvature and attitude setpoints and real time measurements. The model-based controller is configured with a wellbore propagation model that characterizes the tool's response dynamics. The curvature cruise controller utilizes real time drilling operation parameters measurements to tune the model-based controller.

Perturbation based well path reconstruction

A well path for a directional drilling device may be updated by determining a perturbation for a new well path from a current bottom-hole assembly position to a target using the initial well plan (or any well path of reference) as a reference. An initial well plan may be determined for a directional drilling device along with a current actual borehole position of a drilling device along with other parameters such as attitude. With this, a perturbation to the well plan based on the current actual borehole position of a drilling device and a subterranean target maybe determined. Based on this perturbation an updated borehole path may be determined.

Optimización del modo de relación deslizamiento-rotación para el control de la trayectoria del motor de lodo

Los aspectos de la tecnología en cuestión se refieren a sistemas y métodos para mejorar los controles de trayectoria del motor de lodo. Se proporcionan sistemas y métodos para recibir datos de control desde un controlador de trayectoria del motor de lodo, predefinir una pluralidad de modos de control en función de los datos de control del controlador de trayectoria del motor de lodo, lograr relaciones de rotación de deslizamiento y ángulos de orientación de la herramienta deseados al resolver una función objetivo establecida que representa matemáticamente las preferencias operativas y las limitaciones del sistema para un modo de control seleccionado de la pluralidad de modos de control, generar un procedimiento de modulación que convierte las relaciones de deslizamiento-rotación en una secuencia de control binaria de deslizamiento y rotación, y aplicar el procedimiento de modulación para generar la secuencia de control binaria de deslizamiento y rotación.

System to correlate suitable slurry designs with petrophysical while-drilling measurements in real time

A method of designing a cement blend for a wellbore isolation barrier from datasets indicative of drilling a wellbore. The drilling datasets may include drilling equipment data, bottom hole assembly data, and mud system data. A drilling path record comprising depth segments with averaged data values of drilling data can be generated by processing the drilling datasets. A design process can determine a stress state for each depth segment of the drilling path record and design a cement blend with mechanical properties exceeding the stress state. The design process can determine an optimized cement design comprising the cement blend for each depth segment of the drilling path record.

System to correlate suitable slurry designs with petrophysical while-drilling measurements in real time

A method of designing a cement blend for a wellbore isolation barrier from datasets indicative of drilling a wellbore. The drilling datasets may include drilling equipment data, bottom hole assembly data, and mud system data. A drilling path record comprising depth segments with averaged data values of drilling data can be generated by processing the drilling datasets. A design process can determine a stress state for each depth segment of the drilling path record and design a cement blend with mechanical properties exceeding the stress state. The design process can determine an optimized cement design comprising the cement blend for each depth segment of the drilling path record.

Geosteering interpretation using bayesian inference

A geosteering subsystem has been designed to detect patterns in measurements that correlate to geological events and use statical analysis to interpret the geological events corresponding to control points and update a geological model based on the statistical analysis-based interpretations. The subsystem evaluates obtained measurements against predetermined patterns that correlate to geological events. If a pattern is detected, the subsystem labels the corresponding wellbore position and/or measurements as a control point and passes on the measurements for interpretation. The subsystem generates interpretations of the control point based on the measurements and historic control points. For each interpretation, the subsystem generates a pseudo log based on offset logs. The subsystem then generates a posterior probability for each interpretation based on evaluating the corresponding pseudo log with respect to the measurements and formation knowledge. High posterior probability interpretations are selected for updating the geological model.

Model-based curvature cruise control design

A curvature cruise controller has been designed to maintain a desired curvature when drilling a curve section of a wellbore. The curvature cruise controller utilizes a model-based controller (such as an LQR controller) to generate steering inputs based on the desired curvature and attitude setpoints and real time measurements. The model-based controller is configured with a wellbore propagation model that characterizes the tool's response dynamics. The curvature cruise controller utilizes real time drilling operation parameters measurements to tune the model-based controller.

Geosteering interpretation using bayesian inference

Geosteering interpretation using bayesian inference

A geosteering subsystem has been designed to detect patterns in measurements that correlate to geological events and use statical analysis to interpret the geological events corresponding to control points and update a geological model based on the statistical analysis-based interpretations. The subsystem evaluates obtained measurements against predetermined patterns that correlate to geological events. If a pattern is detected, the subsystem labels the corresponding wellbore position and/or measurements as a control point and passes on the measurements for interpretation. The subsystem generates interpretations of the control point based on the measurements and historic control points. For each interpretation, the subsystem generates a pseudo log based on offset logs. The subsystem then generates a posterior probability for each interpretation based on evaluating the corresponding pseudo log with respect to the measurements and formation knowledge. High posterior probability interpretations are selected for updating the geological model.

A model-based curvature cruise control design

Methods for estimating downhole weight on bit and rate of penetration using acceleration measurements

Methods and compositions for estimating one or more downhole qualities of a drilling apparatus by obtaining axial acceleration data. The axial acceleration data may be acquired by measuring an axial acceleration of a bottom hole assembly. The axial acceleration may then be used to estimate one or more of a downward weight on a drill bit of the drilling apparatus or a rate of penetration of the drill bit.

Geosteering interpretation with multiple logging-while-drilling sensors

A computer-implemented method for drilling a wellbore in a subsurface formation. The method comprises obtaining measurement data including a first measurement from a first sensor and a second measurement from a second sensor of a drilling assembly in the wellbore. The method comprises generating, based on the first measurement, a first control point indicating a geological feature and having a first confidence interval. The method comprises generating, based on the second measurement, a second control point indicating the geological feature and having a second confidence interval. The method comprises generating a curve indicating a formation bed boundary of the subsurface formation based on the first and second control points and the first and second confidence intervals. The method comprises performing a drilling operation in the wellbore based on the formation bed boundary.

Model-based curvature cruise control design

A curvature cruise controller has been designed to maintain a desired curvature when drilling a curve section of a wellbore. The curvature cruise controller utilizes a model-based controller (such as an LQR controller) to generate steering inputs based on the desired curvature and attitude setpoints and real time measurements. The model-based controller is configured with a wellbore propagation model that characterizes the tool's response dynamics. The curvature cruise controller utilizes real time drilling operation parameters measurements to tune the model-based controller.

Geosteering interpretation with multiple logging-while-drilling sensors

A computer-implemented method for drilling a wellbore in a subsurface formation. The method comprises obtaining measurement data including a first measurement from a first sensor and a second measurement from a second sensor of a drilling assembly in the wellbore. The method comprises generating, based on the first measurement, a first control point indicating a geological feature and having a first confidence interval. The method comprises generating, based on the second measurement, a second control point indicating the geological feature and having a second confidence interval. The method comprises generating a curve indicating a formation bed boundary of the subsurface formation based on the first and second control points and the first and second confidence intervals. The method comprises performing a drilling operation in the wellbore based on the formation bed boundary.

Métodos para estimar el peso sobre la barrena en el fondo de pozo y la velocidad de penetración mediante el uso de mediciones de aceleración

Métodos y composiciones para estimar una o más cualidades de fondo de pozo de un aparato de perforación al obtener datos de aceleración axial. Los datos de aceleración axial se pueden adquirir al medir una aceleración axial de un ensamblaje de fondo de pozo. La aceleración axial luego se puede usar para estimar uno o más de un peso hacia abajo sobre una barrena de perforación del aparato de perforación o una velocidad de penetración de la barrena de perforación.

Methods for estimating downhole weight on bit and rate of penetration using acceleration measurements

Methods and compositions for estimating one or more downhole qualities of a drilling apparatus by obtaining axial acceleration data. The axial acceleration data may be acquired by measuring an axial acceleration of a bottom hole assembly, lire axial acceleration may then be used to estimate one or more of a downward, weight on a drill bit of the drilling apparatus or a rate of penetration of the drill bit.

Geosteering interpretation with multiple logging-while-drilling sensors

Optimal probabilistic steering control of directional drilling systems

Aspects of the subject technology relate to systems and methods of controlling a drill string having a steerable bit when drilling a wellbore through a substrate. A deterministic model of a directional behavior of the drill string is developed that includes a drill string state, one or more drill parameters associated with the drill string, and one or more substrate parameters associated with the substrate. A stochastic differential model of the directional behavior of the drill string is then developed by replacing the state and each of the parameters of the deterministic model with respective probability distributions and adding feedback. The stochastic differential model is reduced to a truncated stochastic model by substituting a predetermined number of terms of a generalized polynomial chaos expansion for each probability distribution and then evaluating the expectations.

Systems and methods to perform automated drilling

The disclosed embodiments include systems and methods to perform automated drilling for both surface and downhole control. The method includes receiving a curvature reference set point, and calculating a curvature error with respect to the curvature reference set point. The method also includes providing the curvature error to a linear matrix inequalities based robust linear quadratic regulator controller. The method further includes determining one or more steering commands based on an output of the linear matrix inequalities based robust linear quadratic regulator controller. The method further includes providing the one or more steering commands to be implemented by a drilling tool during a drilling operation.

Methods for estimating downhole weight on bit and rate of penetration using acceleration measurements

Methods and compositions for estimating one or more downhole qualities of a drilling apparatus by obtaining axial acceleration data. The axial acceleration data may be acquired by measuring an axial acceleration of a bottom hole assembly. The axial acceleration may then be used to estimate one or more of a downward weight on a drill bit of the drilling apparatus or a rate of penetration of the drill bit.