Selective water plugging method for high-water-cut gas well of bottom water gas reservoir

Abstract

The invention discloses a selective water plugging method for a high-water-cut gas well of a bottom water gas reservoir. The selective water plugging method comprises the following steps that S1, the position of a water outlet gas layer caused by bottom water coning is determined; S2, a foaming agent solution is injected into the water outlet gas layer, wherein the foaming agent solution is an aqueous solution of an ionic foaming agent, and the concentration is controlled to be 0.5%-1.2%; S3, after the step S2 is completed, nitrogen is injected, and the nitrogen enters a water production high-pressure layer to force water cone of the immediate vicinity of wellbore to fall back; S4, a plugging agent is injected into a water production channel in a directional mode, an artificial partition plate is formed in the water production layer, a bottom water channeling channel is plugged, and bottom water coning is restrained and relieved; and S5, liquid nitrogen over-displacement is carried out, and the permeability of the immediate vicinity of wellbore is recovered and reserved. According to the method, the artificial partition plate is built at the water outlet layer position of the high-water-cut gas well of the bottom water gas reservoir, intelligent selective water plugging of the high-water-cut gas well of the bottom water gas reservoir can be achieved, and the problem that the gas well yield is sharply reduced after water breakthrough of the gas reservoir is solved.

Description

technical field [0001] The invention relates to the technical field of bottom oil and gas exploitation, in particular to a method for selectively shutting off water in a gas well with high water content in a bottom water gas reservoir. Background technique [0002] Water production from gas wells is an inevitable problem in the development of oil and gas fields. With the development of gas fields, the number of wells producing water and flooded wells is increasing, leading to a decline in production of gas wells, and even complete water flooding of gas wells, which reduces the ultimate recovery of gas fields, which is also the main reason for the deterioration of economic benefits of gas wells One, it is necessary to propose supporting drainage gas recovery and water shutoff technology for water-flooded wells. [0003] Drainage and gas recovery methods mainly include: deployment of drainage wells, mechanical drainage, foam drainage, gas lift + foam row, plunger + foam row, ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a selective water shutoff method for high water content gas wells in bottom water gas reservoirs for the problem of difficult water shutoff in gas wells with high water content in bottom water gas reservoirs

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