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Gas well reservoir water block removing agent and preparation method thereof

A technology for dehydrating water lock agent and reservoir, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of unstable production, low production, and shale gas wells unable to rely on their own energy to maintain production, etc., to improve effective penetration. rate, the ability to improve the flow, the effect of improving the conductivity

Active Publication Date: 2021-07-02
辽宁泰戈油气工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As of now, wells put into production before 2019 have basically entered the stage of low pressure and low production. The pressure is lower than 3 MPa, and the production is lower than 30,000 cubic meters per day. As a result, shale gas wells cannot rely on their own energy to maintain production. Methods such as gas lift and drainage can not stabilize production

Method used

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  • Gas well reservoir water block removing agent and preparation method thereof
  • Gas well reservoir water block removing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The gas well reservoir water-blocking agent is composed of the following raw materials in mass fraction: cetyltrimethylammonium bromide 30%, coconut oil fatty acid diethanolamide 20%, limonene 20%, fumed silica 5%, dimethyl carbonate Esters 25%.

[0028] The preparation method of the gas well reservoir dewatering and locking agent of this embodiment is to mix cetyltrimethylammonium bromide, coconut oil fatty acid diethanolamide, limonene, fumed silica, and dimethyl carbonate uniformly.

Embodiment 2

[0030] The water-blocking agent for gas well reservoirs is composed of the following raw materials in mass fractions: octadecyl dimethyl benzyl ammonium chloride 28%, Tween 20 23%, limonene 18%, fumed silica 4%, dimethyl carbonate 27%.

[0031] The preparation method of the gas well reservoir dewatering and locking agent in this embodiment is to mix octadecyldimethylbenzyl ammonium chloride, Tween 20, limonene, fumed silica, and dimethyl carbonate uniformly.

Embodiment 3

[0033] The water-blocking agent for gas well reservoirs is composed of the following raw materials in mass fractions: 25% polyacrylamide, 22% octanol polyoxyethylene ether, 17% limonene, 3% fumed silica, and 33% dimethyl carbonate.

[0034] The preparation method of the dehydration and locking agent for the gas well reservoir in this embodiment consists in uniformly mixing polyacrylamide, octanol polyoxyethylene ether, limonene, fumed silica, and dimethyl carbonate.

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Abstract

The invention provides a gas well reservoir water block removing agent and a preparation method thereof, which belong to the technical field of shale gas exploitation. The gas well reservoir water block removing agent comprises the following raw materials by mass: 20-30% of a cationic active agent, 20-25% of a nonionic active agent, 15-20% of limonene, 1-5% of a nano material, and the balance of dimethyl carbonate. Through cooperation of the cationic surface active agent, the nonionic surface active agent, the limonene, the nano material and the dimethyl carbonate, ultralow-order-of-magnitude interfacial tension can be formed, stable and rich low-density foam can be formed, the foam can be efficiently mixed with well bottom accumulated liquid in a gas well seriously flooded, then the accumulated liquid is displaced, therefore, the purpose of removing the water block is achieved.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploitation, and in particular relates to a gas well reservoir dewatering and locking agent. In addition, the invention also relates to a preparation method of the gas well reservoir dewatering and locking agent. Background technique [0002] Shale gas is a kind of "continuous" accumulation of unconventional natural gas. It occurs in organic-rich shale and its interlayers. , high-efficiency energy resources and chemical raw materials, mainly used for residential gas, urban heating, power generation, automobile fuel and chemical production, etc., with a wide range of uses. [0003] At present, the exploitation of shale gas is mainly through drilling. Shale gas drilling has experienced the development of vertical wells, single horizontal wells, multi-branched horizontal well cluster wells, and cluster horizontal wells. At present, horizontal wells have become the mainstay of shale gas development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60
CPCC09K8/584C09K8/602C09K8/604C09K2208/10
Inventor 刘建李凤锦陈向伟
Owner 辽宁泰戈油气工程技术有限公司
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