Integrated and combined gas production method based on plunger gas lifting and foam drainage

Abstract

The invention relates to an integrated and combined gas production method of based on plunger gas lifting and foam drainage. The integrated and combined gas production method based on the plunger and the foam drainage solves the problems that the process existing of drainage gas production techniques is simplex and a multi-item dewatering and gas production technology under complicated changeable well condition is complex. According to technical scheme of the integrated and combined gas production method based on the plunger and the foam drainage includes the steps that a foam drainage rod is made firstly, the rod is a cylindrical plunger, a plunger main chamber is formed in the rod, trapezoidal grooves in spiral shapes are distributed on external surface of the main plunger body at equal intervals, fluid through holes are evenly distributed between the grooves, the plunger main chamber and the fluid through holes are connected through a small fluid channel; the main components of the foam drainage rod include polyethylene glycol, sodium dodecyl benzene sulfonate, imidazoline, polyoxyethylene alkyl ether and carboxymethyl cellulose; in the gas lifting and drainage stage of the plunger, the plunger lifts the liquid out of the well in a slugged mode; and the main plunger body is gradually dissolved, the foam drainage rod sinks to the bottom of the well, and dissolves to produces large amounts of foam, gas production is conducted through foam drainage. According to the gas production method, two drainage and gas production technologies are conducted spontaneously, the process is simple and the best drainage and gas production effect can be achieved.

Description

technical field [0001] The invention relates to an integrated composite gas recovery method of plunger gas lift and foam drainage used in the gas recovery process of oil and gas fields, and belongs to the field of gas reservoir drainage and gas recovery. Background technique [0002] Gas wells produce liquid to varying degrees during the production process. The liquid in the gas well is usually distributed in the gas phase in the form of droplets. The gas is a continuous phase while the liquid flows in a discontinuous phase. The liquid is carried by the gas to the surface in the form of droplets. Liquid accumulations form at the bottom of gas wells when the gas phase does not provide sufficient capacity to continuously flow liquids in the wellbore out of the wellhead. 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 c...

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Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the problem of single process in current drainage and gas recovery technology, and multiple drainage and gas recovery processes for wells with complex well conditions, the present invention will spontaneously perform plunger gas lift liquid drainage and gas recovery and foam drainage in sequence Two processes of gas recovery, an integrated composite gas recovery method of plunger gas lift and foam drainage

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