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Preparation method of gas-well water controlling agent

A water control agent and gas well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor reservoir physical properties, short water control period, easy blockage of gas flow channels, etc., and achieve thermal stability and salinity. Good stability, small change in gas phase permeability, and easy control of reaction conditions

Inactive Publication Date: 2012-11-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it mainly includes: improved polymer cross-linking technology, polymer bridge bond adsorption technology, and interpenetration improved water control system, etc. However, most water control agents are high molecular weight polymers. In the process of using in low permeability gas fields, there are mainly the following Some problems: (1) Low-permeability gas reservoirs have poor physical properties, strong sensitivity, and start-up pressure gradients, while high-molecular polymers or cross-linked systems have high viscosity and high injection pressure, which can easily block gas flow channels and cause reservoir damage; ( 2) Wetting reversal technology has high construction cost, short water control period, and difficult to control the effect; (3) Most of the research on relative permeability improvement systems at home and abroad focuses on selective water shutoff of high permeability reservoirs and field or laboratory test effect evaluation

Method used

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  • Preparation method of gas-well water controlling agent

Examples

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Effect test

Embodiment 1

[0028] A gas well water control agent and a preparation method thereof, comprising the steps of:

[0029] a. At room temperature, uniformly mix anionic polyacrylamide (molecular weight: 16 million), cationic polymer and KCl solution with a mass concentration of 2.0% according to the mass ratio of 0.1:0.02:100, and stir slowly until completely dissolved to form a polymer compound solution;

[0030] The cationic polymer is formed by the copolymerization of acryloyloxyethyltrimethylammonium chloride and acrylamide, with a molecular weight of 4 million.

[0031] b. Compound ethyl acetate, sodium bicarbonate and the polymer composite solution formed in step a according to the mass ratio of 0.1:0.5:100 to obtain a gas well water control agent with water control effect.

Embodiment 2

[0033] A gas well water control agent and a preparation method thereof, comprising the steps of:

[0034] a. At room temperature, uniformly mix anionic polyacrylamide (molecular weight: 16 million), cationic polymer and KCl solution with a mass concentration of 2.0% according to the mass ratio of 0.15:0.05:100, and stir slowly until completely dissolved to form a polymer compound solution;

[0035] Described cationic polymer general embodiment 1.

[0036] b. Compound ethyl acetate, sodium bicarbonate and the polymer composite solution formed in step a according to the mass ratio of 0.15:0.8:100 to obtain a gas well water control agent with water control effect.

Embodiment 3

[0038] A gas well water control agent and a preparation method thereof, comprising the steps of:

[0039] a. At room temperature, uniformly mix anionic polyacrylamide (molecular weight: 16 million), cationic polymer and NaCl solution (co-solvent) with a mass concentration of 2.0% according to the mass ratio of 0.2:0.08:100, and stir slowly until complete Dissolve to form a polymer composite solution;

[0040] The cationic polymer is formed by the copolymerization of acryloyloxyethyltrimethylammonium chloride and acrylamide, with a molecular weight of 4 million.

[0041] b. Compound ethyl lactate, sodium bicarbonate and the polymer composite solution formed in step a according to a mass ratio of 0.2:0.8:100 to obtain a gas well water control agent with water control effect.

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Abstract

The invention relates to a preparation method of a gas-well controlling agent, which comprises the following steps: proportionally and evenly mixing anionic polyacrylamide, cationic polymer and a cosolvent water solution at room temperature to obtain a polymer composite solution; and compounding the polymer composite solution, organic acid ester and carbonate in the proportion of 100:(0.05-0.5):(0.5-1) to obtain the gas-well water controlling agent. The method has the advantages of simple technique and easily controlled reaction conditions; and the gas-well water controlling agent can change the permeation characteristics and pore throat structure or partial water plugging of the gas-well reservoir to achieve the controlled gas-to-water ratio, has the characteristics of favorable shearingresistance, high thermal stability, high salt resistance, low friction resistance and the like, and is used for near-water or high-water-content low-permeability gas-pool water-control gas productionor water-control fracture reconstruction.

Description

technical field [0001] The invention relates to a gas well water control agent and a preparation method thereof, in particular to a gas well water control exploitation or water control fracturing reconstruction for near water or high water content and low permeability gas reservoirs. Background technique [0002] Gas well water control technology is a widely used method of drainage and gas recovery at home and abroad. Can the water blocking method commonly used in oil wells be used for the treatment of these water-producing gas wells? This is a problem that gas field workers at home and abroad generally want to solve. With the increasing status of natural gas in industrial energy, the development of natural gas has become a hot spot. For this reason, oil and gas field workers at home and abroad have also increased their research efforts on measures to enhance oil recovery in gas field development. For some water-producing gas wells, if the water-control technology can be us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44
Inventor 罗明良温庆志孙厚台贾自龙刘佳林刘洪见
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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