A kind of foaming agent for high-inclination-horizontal well drainage and gas recovery

Abstract

The invention relates to a foam draining agent used for foam draining gas recovery of a high-inclination horizontal well. The foam draining agent solves the problems of special well types and complexwell conditions and can adapt to the high-inclination horizontal well. According to the technical scheme, a soluble film is made into a shell, and the soluble film is composed of polyvinyl alcohol orpolyvinylpyrrolidone or a mixture of the two; an elliptical shell interlayer is filled with three substances, and the whole interlayer is filled with the liquid foam draining agent mixed with a granular corrosion inhibitor and a powder foam stabilizer; the prepared foam draining agent used for foam draining gas recovery of the high-inclination horizontal well is put into a gas well, relative sliding of an inner membrane and an outer membrane can allow the elliptical foam draining agent to slide automatically, thus the elliptical foam draining agent can easily reach a horizontal section, the foam draining agent is dissolved to form a large amount of foam, and the effect of foam draining gas recovery is achieved. The function of the foam draining agent and the foam draining gas recovery efficiency are improved, time and labor are saved, the cost is low and the foam draining agent is environmentally friendly.

Description

technical field [0001] The invention relates to a foaming agent used for high-inclination-horizontal well drainage and gas recovery in the gas recovery process of oil and gas fields, and belongs to the field of gas well drainage and gas recovery. Background technique [0002] During the production process of a gas well, when the gas flow rate in the wellbore decreases to the point where the liquid cannot be continuously carried to the wellhead, part of the liquid will fall back and gradually accumulate at the bottom of the well to form fluid accumulation. Liquid in high-pressure wells exists in the form of slug flow, which will consume more formation energy and limit the production capacity of gas wells; liquid accumulation in low-pressure wells can completely crush the gas well, causing water flooding and shutting down the gas well, reducing the production of the gas well. [0003] In the commonly used methods of natural gas foam drainage and gas recovery, the injection met...

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Problems solved by technology

[0005] According to literature research, there is no report on the idea, product, process design method and theoretical basis research of a foam drainage agent for drainage and gas recovery in highly inclined-horizontal wells in the foam drainage gas recovery process.

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