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Efficient clay inhibitor for shale gas fracturing and preparation method of efficient clay inhibitor

A clay inhibitor and air pressure technology, which is applied in the field of high-efficiency clay inhibitor for shale gas fracturing and its preparation, can solve problems such as expansion damage, and achieve the effects of stable product performance, stable polymerization reaction and significant production increase.

Inactive Publication Date: 2015-01-28
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-swellable clays such as kaolinite and illite are mainly caused by migration and blockage. In addition, illite, which is sensitive to water, will also cause swelling damage to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example describes a high-efficiency clay inhibitor for shale gas fracturing, and its raw materials include the following components in parts by weight: 650-850 parts of water, 190-230 parts of cationic monomer, 100-140 parts of acrylamide, 0.5 parts of disodium edetate, 0.5 to 3 parts of initiator A, and 0.5 to 3 parts of initiator B; wherein the cationic monomers are methacryloyloxyethyltrimethylammonium chloride, acryloyloxy One or more in ethyl trimethyl ammonium chloride or dimethyl diallyl ammonium chloride, described initiator A is peroxide, adopts potassium persulfate, ammonium persulfate or hydrogen peroxide One or more combinations, the initiator B is a sulfite, using one or more combinations of sodium bisulfite, sodium sulfite or potassium sulfite.

[0026] The concrete steps of its preparation are as follows:

[0027] 1) Dosing: Add 700 parts of water into the dosing tank, add 200 parts of cationic monomer methacryloyloxyethyltrimethylammonium chloride ...

Embodiment 2

[0032] A high-efficiency clay inhibitor for shale gas fracturing provided in this example is prepared through the following steps:

[0033] 1) Dosing: Add 700 parts of water into the dosing tank, add 200 parts of cationic monomer acryloyloxyethyltrimethylammonium chloride under stirring, then heat the dosing tank, and then add 110 1 part of acrylamide, after it is completely dissolved, add 0.5 part of disodium ethylenediamine tetraacetate under stirring, and obtain the preparation solution after it is completely dissolved, and the temperature in the whole process is not higher than 30°C;

[0034] 2) Adjusting the pH value: using sodium hydroxide to adjust the pH value of the preparation solution to 9;

[0035]3) Polymerization: Step 2) the gained configuration liquid is transferred to the reactor, and 1 weight part of initiator A ammonium persulfate (ammonium persulfate aqueous solution that is mixed with 10% ammonium persulfate solution, ammonium persulfate Aqueous solution ...

Embodiment 3

[0038] A high-efficiency clay inhibitor for shale gas fracturing provided in this example is prepared through the following steps:

[0039] 1) Dosing: Add 800 parts of water to the dosing tank, add 200 parts of cationic monomer dimethyl diallyl ammonium chloride under stirring, then heat the dosing tank, and then add 110 parts under stirring Acrylamide, after it is completely dissolved, add 0.5 parts of disodium ethylenediaminetetraacetate under stirring, and obtain a preparation solution after it is completely dissolved, the temperature of the whole process is not higher than 30°C;

[0040] 2) Adjusting the pH value: using sodium hydroxide to adjust the pH value of the preparation solution to 9.5;

[0041] 3) Polymerization: Step 2) the gained configuration liquid is transferred to the reactor, and 1 weight part of initiator A ammonium persulfate (ammonium persulfate aqueous solution that is mixed with 10% ammonium persulfate solution, ammonium persulfate Aqueous solution is...

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PUM

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Abstract

The invention discloses an efficient clay inhibitor for shale gas fracturing and a preparation method of efficient clay inhibitor. The efficient clay inhibitor for shale gas fracturing comprises the following raw materials in parts by weight: 650-850 parts of water, 190-230 parts of cationic monomer, 100-140 parts of acrylamide, 0.5 part of EDTA, 0.5-3 parts of an initiator A and 0.5-3 parts of an initiator B. According to the invention, the solid content of the synthesized efficient clay inhibitor is about 35%, and an anti-swelling ratio is 80.3% when the dosage is 0.5%; the efficient clay inhibitor is an excellent clay inhibitor with less dosage, quick action and low price. In addition, the efficient clay inhibitor has high temperature resistance, more durable shale stability and excellent compatibility. According to the efficient clay inhibitor for shale gas fracturing, the production synthesis temperature is 40 DEG C, the polymerization reaction is stable, the production efficiency is high, and the product performance is very stable.

Description

technical field [0001] The invention relates to an agent for increasing oil and gas production, in particular to a high-efficiency clay inhibitor for shale gas fracturing and a preparation method thereof. Background technique [0002] Shale oil and gas layers generally contain clay minerals. Shale is a kind of sedimentary rock with complex composition, but they all have thin-sheet or thin-sheet-like joints, which are mainly transformed by clay deposition through the joint action of formation pressure and temperature. It is rock, but it is mixed with mineral debris such as feldspar, quartz, mica and other chemical substances. [0003] 97% of the world's oil and gas reservoirs contain variable amounts of various clay minerals. Most of the oil reservoirs in my country are sandstone oil reservoirs, which usually contain clay minerals in varying amounts. When the clay content of oil and gas reservoirs is between 5% and 20%, the oil and gas reservoirs are considered to have high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C08F220/56C08F220/60C08F226/02
CPCC09K8/74C08F220/34C08F226/02
Inventor 贾振福吴雪平钟静霞张吉才张鹏周成裕王愉韩德福
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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