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Tight sandstone gas surface gas wettability reversal agent and preparation method and application thereof

A technology of tight sandstone and wetting reversal, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor dispersion and gas wetting change ability, weak adsorption force, etc., and achieves a simple and easy preparation method. , the effect of improving yield and preventing swelling of the matrix

Inactive Publication Date: 2020-12-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a tight sandstone gas surface gas wetting reversal agent and its preparation method and application, which overcomes the deficiencies of the prior art above, and can effectively solve the problem of weak adsorption and dispersion of existing wetting reversal agents. The problem of poor ability to change and Qirun

Method used

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  • Tight sandstone gas surface gas wettability reversal agent and preparation method and application thereof
  • Tight sandstone gas surface gas wettability reversal agent and preparation method and application thereof
  • Tight sandstone gas surface gas wettability reversal agent and preparation method and application thereof

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Embodiment 1

[0029] Embodiment 1: The gas wetting reversal agent on the surface of tight sandstone gas, raw materials include low molecular weight fluoroalkyl acrylate copolymer, mutual solvent, water and emulsifier, wherein, low molecular weight fluoroalkyl acrylate copolymer, The mass ratio of mutual solvent, water and emulsifier is 2:1 to 2:3 to 5:1 to 2, prepared according to the following method: the required amount of low molecular weight fluoroalkyl acrylate copolymer, mutual solvent , water and emulsifier are uniformly mixed to obtain a tight sandstone gas surface gas-wetting reversal agent.

Embodiment 2

[0030] Embodiment 2: The gas wetting reversal agent on the surface of tight sandstone gas, raw materials include low molecular weight fluoroalkyl acrylate copolymer, mutual solvent, water and emulsifier, wherein, low molecular weight fluoroalkyl acrylate copolymer, The mass ratio of mutual solvent, water and emulsifier is 2:1 or 2:3 or 5:1 or 2, prepared according to the following method: the required amount of low molecular weight fluoroalkyl acrylate copolymer, mutual solvent , water and emulsifier are uniformly mixed to obtain a tight sandstone gas surface gas-wetting reversal agent.

Embodiment 3

[0031] Example 3: As an optimization of the above examples, the low molecular weight fluoroalkyl acrylate copolymer is obtained by copolymerizing acrylic acid, methacrylic acid or methyl methacrylate in a ratio of 1:0.5 to 2 to obtain a low molecular weight fluoroalkyl acrylate copolymer with a molecular weight less than or equal to 2000 Fluoroalkyl acrylate copolymers, wherein the fluoroalkyl group is C 2 to C 10 fluorinated linear alkyl groups.

[0032] In the present invention, the model of the fluoroalkyl acrylate copolymer can be one of D20, FG24, FSD-61, TF328, Dynol604, and Capstone FS-100.

[0033]The molecular weight of the fluoroalkyl acrylate copolymer is less than or equal to 2000, which can make the tight sandstone gas surface gas wettability reversal agent not only have strong adsorption performance, but also can enter the tight sandstone reservoir, low molecular weight fluoroalkyl The acrylate copolymer adheres to the sandstone surface to isolate the water lay...

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Abstract

The invention relates to the technical field of tight sandstone gas fracturing production increasing transformation, in particular to a tight sandstone gas surface gas wettability reversal agent and apreparation method and application thereof. The reversal agent comprises the followings raw materials: a low-molecular-weight fluoroalkyl acrylate copolymer, a mutual solvent, water and an emulsifying agent, a required amount of the low-molecular-weight fluoroalkyl acrylate copolymer, the mutual solvent, the water and the emulsifier are uniformly mixed to obtain the tight sandstone gas surface gas wettability reversal agent, and the reversal agent is applied to the aspect of increasing the yield of tight sandstone gas wells. The low-molecular-weight fluorocarbon copolymer, the mutual solventand an emulsifier system used in the invention have very good dispersibility, are beneficial to on-site liquid preparation and use, successfully realize compact sandstone surface gas wettability reversal, and can effectively convert the tight sandstone layer surface from liquid wettability to gas wettability. The preparation method is simple and easy, blockage of pores of the tight sandstone and expansion of a matrix can be prevented, so that the yield of the tight sandstone gas wells is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of tight sandstone gas fracturing stimulation and transformation, and relates to a tight sandstone gas surface gas wetting reversal agent and its preparation method and application. Background technique [0002] In recent years, the development of tight sandstone gas in my country has developed rapidly, and it has become the first priority of unconventional gas and the core strategy to ensure natural gas supply and alleviate foreign dependence. Multi-stage fracturing of vertical wells and multi-stage fracturing of horizontal wells are key reservoir stimulation technologies for tight sandstone gas reservoirs at home and abroad to improve single well production and development benefits. However, since most of the tight sandstone reservoirs are hydrophilic, the surface of the tight sandstone is mostly water-wet, so the water pressed into the tight sandstone reservoirs during the large-scale hydraulic fracturing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60C09K8/584
CPCC09K8/604C09K8/584C09K2208/12
Inventor 王肃凯曹华宝张贵仪宋会光王天祥蒲松龄刘伟王庆国钱莉莎任翔
Owner BC P INC CHINA NAT PETROLEUM CORP