Delayed crosslinking fracturing fluid composition

A delayed cross-linking and fracturing fluid technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of not effectively delaying cross-linking performance, and achieve the effect of reducing shear loss and thickening

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects in the prior art that polyacrylamide thickeners have no effective delayed crosslinking performance, and provide a delayed crosslinking fracturing fluid composition, specifically, a delayed crosslinking Polyacrylamide polymer fracturing fluid composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 4 grams of polyacrylamide fracturing special material acrylamide / sodium acrylate copolymer (AM / AA(Na) (molecular weight: 4 million) in 1000ml of water, and let it stand for 2 hours to form a base liquid; at room temperature, add 20 grams of chlorine Potassium chloride, 1 gram of glutaraldehyde, 0.5 gram of citric acid, 1 gram of NE-940, and 0.5 gram of ammonium persulfate were stirred and dissolved, and 200 ml of base liquid was placed in a Warring mixer, and stirring was started, and 1.2 grams of delayed Cross-linking agent (the weight ratio of metal salt aluminum chloride, glyoxal, glycerin and deionized water is 1:2:2:0.5), the recorded vortex closing time is 192 seconds, the gel is uniform, and the vortex is closed for 4 minutes Can be picked later.

Embodiment 2

[0025] Dissolve 4 grams of polyacrylamide fracturing special material acrylamide / 2-acrylamide-2-methylpropanesulfonate sodium copolymer (average molecular weight: 6 million) in 1000ml of water, and let it stand for 2 hours to form a base liquid; room temperature Next, add 1 gram of DIONIC900, 0.5 gram of citric acid, 1 gram of FlowGas-M, 0.5 gram of ammonium persulfate and stir to dissolve, take 200ml of base liquid in a Warring mixer, start stirring, and add 0.8 gram of delayed crosslinking agent (The weight ratio of metal salt chromium chloride, glyoxal, glycerin and deionized water is 1:2:2:1), the recorded vortex closing time is 267 seconds, the gel is uniform, and can be picked after 5 minutes of vortex closing. hang.

Embodiment 3

[0027] Dissolve 4 grams of acrylamide / N,N-dimethylacrylamide copolymer, a special material for polyacrylamide fracturing, in 1000ml of water, and let it stand for 2 hours to form a base liquid; at room temperature, add 1 gram of trimethylammonium chloride, After stirring and dissolving 1 gram of glutaraldehyde, 3 grams of citric acid, 1 gram of NE-201, and 0.5 gram of ammonium persulfate, take 200 ml of base liquid in a Warring mixer, start stirring, and add 0.2 gram of delayed crosslinking agent ( Among them, the weight ratio of metal salt titanium chloride, glyoxal, glycerin and deionized water is 1:3:2.5:0.5), the recorded vortex closing time is 573 seconds, the gel is uniform, and can be picked up after 7 minutes of vortex closing .

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PUM

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Abstract

The invention discloses a delayed crosslinking fracturing fluid composition containing a polyacrylamide polymer, a delayed crosslinking agent, a fracturing auxiliary agent and water, wherein the delayed crosslinking agent is prepared by mixing a polyvalent metal salt, glyoxal, glycerol and deionized water. With adopting of the delayed crosslinking fracturing fluid composition, delayed crosslinking can be realized, the stable and uniform delayed crosslinking liquid composition which can be hung can be formed, the delay time can be controlled in the range of 3-10 minutes, and the requirements of fracturing site construction are met.

Description

technical field [0001] The invention relates to a delayed crosslinking fracturing fluid composition, in particular to a delayed crosslinking polyacrylamide polymer fracturing fluid composition. Background technique [0002] Delayed cross-linking technology is an important technology in the hydraulic fracturing of oil and gas wells. This technology makes the online mixed fracturing fluid not cross-linked when it flows in the wellbore, and only a certain amount of thickener can make the fracturing The fluid has a certain viscosity to carry the proppant, so the shear degradation of the polymer in the fracturing fluid is not serious; after the fracturing fluid enters the formation, a cross-linking reaction occurs, and the viscosity of the fracturing fluid increases, which is conducive to creating fractures in the formation. [0003] At present, the delayed cross-linking water-based fracturing fluid used in oil and gas well fracturing is mainly a delayed cross-linking fracturing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 祝纶宇伊卓方昭杜超赵方园刘希徐阳林蔚然张文龙
Owner CHINA PETROLEUM & CHEM CORP
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