Water drive gas reservoir exploitation method

Abstract

The invention provides a water drive gas reservoir exploitation method. The water drive gas reservoir exploitation method comprises the steps that after a gas layer is drilled, well drilling continuesto be conducted on a lower rock stratum, a liquid accumulating area is formed, a draining gas recovery system is mounted in a casing pipe, the casing pipe extends to the bottom of the liquid accumulating area, and a plurality of gas holes are formed in the position, corresponding to the gas layer, of the casing pipe wall. Liquid in a gas well is temporarily stored in the liquid accumulating area,it is ensured that no liquid is accumulated in a gas hole well section, and thus the phenomena of reverse imbibition (gas resisted by water) and formation of a water cone are avoided and restrained;gas-liquid shunting is achieved through the draining gas recovery system, thus flowing of the gas in the gas recovery process does not need to overcome the resistance of the liquid, single-phase upward flowing is kept, the problem that the gas is pressed by the water is solved, the gas without the resistance flows more smoothly, the flowing speed is higher, and thus the recovery rate of the gas isincreased; the liquid of the gas well is drained to the ground by the draining gas recovery system through a draining pipe with the help of the stratum pressure and then external force, thus the liquid in the liquid accumulating area is drained in time, and flooding of the gas hole well section is avoided.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a water drive gas reservoir exploitation method. Background technique [0002] Most of the natural gas reservoirs at home and abroad are surrounded by formation water in part or all of their boundaries, and such gas reservoirs are called water drive gas reservoirs. Water production is unavoidable during the production of water drive gas reservoirs. When the water content in the near-wellbore zone increases, the gas flow is restricted, resulting in a decrease in gas well recovery, and severe water production may lead to no gas production at all, thus forcing Shutting down the well will affect the recovery of the gas well. Therefore, after the gas well produces water, how to discharge the water stored in the gas well in time is the key for the gas well to maintain normal production. [0003] In the prior art, according to factors such as well depth,...

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Problems solved by technology

[0005] The invention provides a water drive gas reservoir mining method to solve the problems in the prior art that the liquid resistance affects the gas flow during the gas recovery process of the water drive gas reservoir, resulting in slow gas flow rate and low recovery factor

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