Temporary plugging agent for staged fracturing of horizontal well and preparation method thereof

The invention relates to a temporary plugging agent for the staged fracturing of a horizontal well and a preparation method thereof. The temporary plugging agent consists of the following components of guar gum, aluminum oxide, magnesium oxide, an ammonium persulfate microcapsule gel breaker, sodium polyacrylate spherule and sodium bicarbonate according to a mass ratio of 48:107:193:(11-42):24:1.26. The preparation method comprises the following steps of: mixing the guar gum, the aluminum oxide, the magnesium oxide, the ammonium persulfate microcapsule gel breaker, the sodium polyacrylate spherule and the sodium bicarbonate which serve as raw materials uniformly at room temperature according to the ratio, adding the mixture into water slowly with stirring, and stirring for 5 minutes to obtain the temporary plugging agent for the staged fracturing of the horizontal well. The temporary plugging agent is subjected to a cross-linking reaction at the well temperature of between 60 and 80 DEG ...

Packer packing multi-layer hydropower abrasive perforating and fracturing integrated technique

An integrative method for a packer to pack off a multi-layer hydraulic sand-spraying perforation and pressure fracture is used in the multi-layer perforation and the pressure fracture of a well of well completion of a petroleum casing. A pipe column comprises an oil pipe, a safety joint, a hydraulic ejector, a K34 or a Y34 packer, a uniflow valve, a sieve vessel and an end cap, wherein, the lower layer of a hydraulic ejector position requires perforation depth. With the completion of perforation, the hydraulic sand-spraying fractures the lower layer by actively circulating the lower layer of the hydraulic sand-spraying perforation. When the hydraulic sand-spraying pressure fracture for the lower layer is completed, a reverse circulation surge tank is processed and the pipe column is leveled up and dragged to the upper layer of perforation pressure fracture to continue to fracture the upper layer by hydraulic sand-spraying perforation. After completion, the pipe column is lifted to be put ...

Online method for measuring oil density in oil containing sewage and device thereof

The invention discloses the online measuring the oil concentration of the sewage and its equipment. The method adopts the ultrasonic emulsification oil-water mixture and uses the optical nephelo method to test the oil concentration. The equipment comprises the measuring section vertically put on the sewage pipeline, the ultrasonic oscillator set at the input and the output ends of the measuring section; three pairs of white gem windows transmitting beams set at the outside pipe wall, and the windows arrange in 120 Deg angle mutually; three groups of photoelectric converters are set corresponding to the windows; connect the industrial controller with a displayer through the signal receiver and the amplifier. When the sewage flows through the test section, the ultrasonic oscillator emulsificates the sewage and mixes it evenly; the testing beam is the violet beam with fixed wavelength; the photoelectric converter converses the optical signal into the electric signal and the optical nephelometer ...

Online method for measuring oil density in oil containing sewage and device thereof