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A selective water plugging method for high water cut gas wells in bottom water gas reservoirs

A selective, water-gas technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as water shutoff difficulties, and achieve benefits to gas well production, recovery of permeability, and foam stability Good results

Active Publication Date: 2022-07-22
SOUTHWEST PETROLEUM UNIV
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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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  • A selective water plugging method for high water cut gas wells in bottom water gas reservoirs
  • A selective water plugging method for high water cut gas wells in bottom water gas reservoirs
  • A selective water plugging method for high water cut gas wells in bottom water gas reservoirs

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Embodiment Construction

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

[0026] The invention provides a method for selective water plugging of gas wells with high water cut in bottom water gas reservoirs. Because there is no gas phase in the layer, no foam will be generated. Therefore, automatic fixed-point temporary plugging can be realized to protect the potential gas-producing layer. Afterwards, nitrogen is injected at high speed and high pressure to press down the water cone near the wellbore, communicate with the natural gas at the far end, increase the gas seepage capacity, and create conditions for the subsequent entry of the plugging agent. Next, inject the plugging agent into the water-producing layer. Due to the pre-injected foaming agent ...

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Abstract

The invention discloses a method for selective water plugging of high water-cut gas wells in bottom water gas reservoirs. The foaming agent solution is an aqueous solution of an ionic foaming agent, and the concentration is controlled at 0.5%-1.2%; S3, after the completion of step S2, inject nitrogen, so that the nitrogen enters the water-producing high pressure layer, forcing the water cone in the near-wellbore zone to fall back; S4, injecting The blocking agent enters the water-producing channel directionally, and forms an artificial baffle in the water-producing layer to block the channel of bottom water channeling, inhibit and alleviate the coning of bottom water; The method is to establish an artificial baffle at the water production layer of the gas well with high water cut in the bottom water gas reservoir, which can realize intelligent selective water plugging of the gas well with high water cut in the bottom water gas reservoir, and solve the problem that the gas well production decreases sharply after the gas reservoir breaks through.

Description

technical field [0001] The invention relates to the technical field of bottom oil and gas exploitation, in particular to a method for selective water plugging of gas wells with high water content in bottom water gas reservoirs. Background technique [0002] Water production from gas wells is an inevitable problem in the development of oil and gas fields. With the exploitation of gas fields, the number of water-producing wells and water-flooded wells is increasing, resulting in the decline of gas well production, and even the situation of gas wells being completely flooded, which reduces the ultimate recovery factor of the gas field, which is also the main reason for the deterioration of the economic benefits of gas wells. First, it is necessary to propose a matching drainage gas recovery and water blocking process for flooded wells. [0003] The main methods of drainage and gas production include: deployment of drainage wells, mechanical drainage, foam drainage, gas lift + ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13E21B47/10C09K8/518C09K8/508
CPCE21B33/13E21B47/10C09K8/518C09K8/5083C09K8/508
Inventor 金发扬钱德升李翔鞠野宋书渝李晓伟
Owner SOUTHWEST PETROLEUM UNIV
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