Sustained-release foaming agent

Which belongs to a field

The invention relates to a solid slowly release foaming agent, is a kind of gasfield foam dewatering agent, which belongs to the technical field of chemical engineering of the oil.

Background Art

Late in the exploitation of a natural gas well, the energy of the gas in the bottom itself, formation water in the gas stream will be in the process of lifting the slip effect and gradually on the bottom of the well or accumulation near the well, liquid saturation is increased, because the logging tool "flooding", "water-lock", "water-sensitive clay mineral of the expansion" and other reasons, the vapor permeability to great injury, might cause water-seal gas, reduced productivity and the final recovery efficiency of a gas, the gas yield caused by gas or water poured in.

At present, a commonly used method for water drainage gas production of the drainage pipe, gas-lift water drainage, foam drainage, ultrasonic atomization drainage, such as sucker rods, and foam drainage sealing mine safely gas production law because the equipment is simple, convenient construction, low cost, large applicable range of well depths, does not affect the normal production of a gas, and the like become rapid development in recent years, the widespread application of industrial gas water drainage gas production technology.

Foam drainage sealing mine safely gas production law principle of the sleeve through the oil pipe or oil foaming agent is injected into the annulus to the well, under agitation of the flow, with a certain stability of the foam, by water or the water clamps the condensate this is a non-continuous phase of high-quality foam, rapidly changing and at the bottom of the structure of the gas-liquid distribution within the pipe string, izutsu effusion into gas, foam phase of expansion. Pipe into the liquid phase of the foam slipping deposition, rapidly changing low position is the relative density of the fluid, for continuous production of foam the gas phase drives outflow izutsu, gradually achieve gas-liquid in the pipe jacket of the structure, so as to discharge the liquid in the well.

The bottom water contains a large amount of mineral ion such as sodium, calcium, magnesium, barium, chlorine, and the like, and the surface of the foam dewatering agent to active component in the mineralized water "salting-out" effect, thereby losing latherability. Therefore, foam dewatering agent must have a relatively high anti-salinity capacity, in order to guarantee normal foaming, the stable time of the foam at the same time.

In the production process, the well will be a greater degree of influence on the production, danger is also increased at the same time, the water should be of a foam dewatering agent released slowly dissolved after, terromycin in the medicine, so can lengthen the cycle of the on-site addition of the medicament, reduce the number of filling operations, reduce labor intensity, save the manpower resources.

Content of the invention

The purpose of this invention is to provide a slow release of foam dewatering agent, foaming agent in the well bore by reducing the dissolution rate, the time the effect of prolonging the effective ingredient, to increase foam water drainage gas production effect.

1, foaming agent component

The slow release type foaming agent comprised of the following components by weight percentage:

2, the mashed essence extract preparation method

takes without the trouble accurate that the whole fruit, crushing, in after adding water the 80-100 and [...] 36-72 hours; the flocculating agent is added after polymerization solution of aluminum sulfate, after the flocculation, takes the supernatant concentrated until the moisture content is less than 5% get soapnut essence extract.

3, foaming agent component performance

Soapnut essence and fatty alcohol polyoxyethylene ether AEO18 two kinds of surface-active substance compounded as the surface active agent. Wherein soapnut also known sapindus mukorossi, which belongs to the plant sapindaceae , in the thickness of the peel pulp shape rich in saponin, saponin simple in the water, and kneading will produce the foam, is a kind of natural foaming agent; fatty alcohol polyoxyethylene ether AEO18 is a negative ion surfactant, has very good heat stability and biological degradability, with other various types of surfactant mixed for use. The invention will be the above-mentioned two kinds of surface-active substance combination, can be mutually reinforcing surface-active properties of the two, the mixed liquid foaming capacity and stability of the foam, the role of analyzes the oilthe emulsification congeals at the same time, the ability of the product is enhanced anticoagulant analyzes the oil , to resist the impact of the unfavorable external environment; the two sharing can also improve the biodegradability of the surfactant, reduce biological toxicity, avoid pollution to the environment; the two is that it can combine the advantages of the ability to foam dewatering agent has a high degree of mineralization, the high degree of mineralization of the normal play or gas well. Because the foaming agent in the rising process of foam produced is apt to burst, this invention adopts the poly-lauroyl-diethanolamine for stable foam, large molecular weight, the viscosity of the foam can be increased, slowing down the flow speed of the liquid surface of the foam, the life cycle of the foam, a foam-stabilizing role, and soapnut essence and fatty alcohol polyoxyethylene ether AEO18 compounded form, the surfactant has relatively high cooperativity, foam can be reduced on-site in the well bore, entrained liquid capacity of the foam enhancement, avoid the water-bubble bursting resistance generated on the wall. This invention adopts the polyvinyl alcohol PAV and acrylic resin as the compound coating agent, the foaming agent is dissolved and through the framework in extremely fine aperture of the channel, the outer diffusion to slowly release, controlling and regulating the release rate of the foaming agent of preparation, period of validity in the agent, prolong the cycle of on-site addition of the medicament, in the production process is reduced, the number of medicine the customs police throws Canada , reduce labor intensity, save the manpower resources.

The effect of this invention

Release foaming agent of this invention with water slowly post-foaming ability, foam has good stability, and samples of the foam and anti-salinity capacity is high, suitable for high salinity of including condensate , yield the use of a natural gas well. Slow release foaming agent of this invention can achieve foaming ability of 175 mm, anti-salinity capacity is up to 250 g/l, anticoagulated analyzes the oil capacity is up to 30%, up to high resistances the 90 [...] , dissolution time more than 72 hours, medicine long period of validity, on-the-spot test phao arranged in power up to 90% or more, the product is non-toxic, easily degradable, will not cause pollution to the environment. The foam dewatering agent can be with methanol, corrosion inhibitor, the compatibility of medicine such as scale inhibitor, and the air, no chemical reaction component, does not increase the toxicity of the gas and combustion products, does not corrode the apparatus and pipeline.

Mode of execution

In the embodiment the following combining specific for further detailed description of this invention.

Embodiment 1

This embodiment slow-release foaming agent composed of the following components: soapnut extract 20%, fatty alcohol polyoxyethylene ether AEO₁₈ 13.3%, poly-lauroyl-diethanolamine 6.7%, polyvinyl alcohol PVA10%, acrylic resin 50%, the foaming agent component with the polyvinyl alcohol PVA, acrylic acid resin compound ratio of 4:1:5.

Embodiment 2

This embodiment slow-release foaming agent composed of the following components: soapnut extract 20%, fatty alcohol polyoxyethylene ether AEO₁₈ 13.3%, poly-lauroyl-diethanolamine 6.7%, polyvinyl alcohol PVA20%, acrylic resin 40%, the foaming agent component with the polyvinyl alcohol PVA, the compounding ratio of acrylic resin 4:2:4.

Embodiment 3

This embodiment slow-release foaming agent composed of the following components: soapnut extract 20%, fatty alcohol polyoxyethylene ether AEO₁₈ 13.3%, poly-lauroyl-diethanolamine 6.7%, polyvinyl alcohol PVA30%, acrylic resin 30%, the foaming agent component with the polyvinyl alcohol PVA, acrylic acid resin compound ratio of 4:3:3.

Embodiment 4

This embodiment slow-release foaming agent composed of the following components: soapnut extract 20%, fatty alcohol polyoxyethylene ether AEO₁₈ 13.3%, poly-lauroyl-diethanolamine 6.7%, polyvinyl alcohol PVA40%, acrylic resin 20%, the foaming agent component with the polyvinyl alcohol PVA, the compounding ratio of acrylic resin 4:4:2.

Embodiment 5

This embodiment slow-release foaming agent composed of the following components: soapnut extract 20%, fatty alcohol polyoxyethylene ether AEO₁₈ 13.3%, poly-lauroyl-diethanolamine 6.7%, polyvinyl alcohol PVA50%, acrylic resin 10%, the foaming agent component with the polyvinyl alcohol PVA, the compounding ratio of acrylic resin 4:5:1.

Test example 1

The present invention relates to a foaming agent component and the two kinds of coating agent according to different matching experiment and foaming ability of duplicate timing chemical dissolving time measuring test.

Test method: according to an example embodiment 1-5 method, the foaming agent material according to the most optimal compounding ratio (i.e.: sapindus mukorossi essence: 50%, poly laurel acid diethanolamine: 33.3%, AEO18: 16.7%)compounded together, and then the excess moisture in the oven drying, and then ground into powder. As the foaming agent component, with the coating agent polyvinyl alcohol PVA and acrylic resin according to these two kinds of materials to different proportions, the agent concentration for the 3.0 [...] , salinity to 250 g/l, anti -30% under the conditions of condensate, the GB/T13173-2008 Ross-Miles method of foaming ability of the test solution, respectively, and in the 90 are respectively under [...] pharmaceutical dissolution time, specific experimental junction

the fruit sees in the following table 1.

Table 1 foaming ability under different compounding ratio test results and dissolve time

Test example 2

The present invention relates to slow release type foaming agent in the foaming ability under different concentrations, foam stability and takes along the fluid rate determination test.

Test method: from test example 1 can be seen, under the condition of same drug concentration, embodiment 2 in the foaming agent component: PVA: acrylic resin is 4:2:4, , the foaming ability, chemical dissolving time is the longest. The embodiment 2 preparation of the slow release type foaming agent gas in different simulation test under the drug concentration, the analog device mainly comprises a Roche takes along the fluid meterlatherometer and constant temperature. Slow release type inspection different concentrations in simulated formation temperature of the foaming agent solution the 90 [...] , analog formation water 250 g/l the mineralized water, anti -30% when the condensate oil foaming capacity, foam stability and takes along the fluid rate , to inspect the invention slow release foaming agent aqueous solution meet the most effective of the actual demand, the concentration range of the most economic use of. Simulated formation water are as follows: weighing 20.00g (CaCl₂), 12.00g (MgCl₂), 33.00g (Na₂ SO₄), 185.00g (NaCl) for 1000 ml beaker, dissolving and diluting with distilled water to the total volume is 1L, the total salinity 250.00 g/l. Specific experiment the results are shown in table 2.

Table 2   example 2 slow release frothers different concentrations in simulation of experimental results

The above embodiment shows that, in the present invention the slow release type foaming agent by soapnut extract 20%, fatty alcohol polyoxyethylene ether AEO₁₈ 13.3%, poly-lauroyl-diethanolamine 6.7%, polyvinyl alcohol PVA20%, acrylic resin 40%, the foaming agent component with the polyvinyl alcohol PVA, the compounding ratio of acrylic resin 4:2:4 compound, in the 90 [...] , total salinity to 250 g/l, anti -30% condensate under the conditions of the foaming ability, chemical dissolving the longest time and; drug concentration the 3.0-7.0 the [...][...] even better foaming capacity and the foam stability, higher takes along the fluid rate and, effect the best and the most economic concentration range is 3.0 the -4.0 the [...][...].