A method of removing liquid accumulation in gas wells by using oil casing pressure balance method

Abstract

The invention belongs to the technical field of water drainage and gas recovery of a gas well, and particularly provides a method for removing gas well accumulated liquid by means of the oil jacket pressure balancing method. The method mainly comprises the steps of bottom hole accumulated liquid diagnosis, formation pressure prediction, flow inducing with the oil jacket balancing method, foam drainage and the like. The feasibility of the technique is determined through accumulated liquid diagnosis and formation pressure prediction. Liquid in a well and foaming agents can be well mixed through accumulated liquid flowing caused by the oil jacket balancing method, and liquid drainage effect is promoted cooperatively. The method is suitable for wells with certain stratum energy and reduced productivity due to liquid accumulation or dead wells. The method is not limited by well deflection, gas-liquid ratio, ground environment and the like and has the advantages of being simple, economical and practical.

Description

technical field [0001] The invention belongs to the technical field of gas well drainage and gas recovery, and in particular relates to a method for removing liquid accumulation in a gas well by using an oil casing pressure balance method. Background technique [0002] Most of the gas reservoirs in my country are low-permeability gas reservoirs, which generally have the characteristics of low porosity and low permeability. The natural energy of the reservoirs is insufficient, and the natural production capacity is low. At the same time, some low-permeability gas reservoirs are in the same layer of gas and water, or water is produced due to water invasion of edge and bottom water, or residual water from fracturing. In the early stage of production, gas wells have large output and high flow rate, and the gas may carry water out of the wellbore. However, as the production progresses, the energy of the formation decreases, and the liquid-carrying capacity of the gas decreases. ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art. Based on the fact that under normal circumstances, the casing pressure is obviously higher than the oil pressure in wells that are shut down due to fluid accumulation. For removing the fluid accumulation in the wellbore, the conventional technology is adopted, which is economical and practical. To solve the problem of poor performance, through bottom hole fluid diagnosis, oil casing pressure balance method to induce blowout and foam drainage, provide a simple, economical and practical method to eliminate gas well wellbore fluid and restore or increase gas well productivity

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