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Temperature-sensitive acid liquid thickening agent for acid fracturing and preparation method thereof

An acid thickener and acid fracturing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high initial viscosity, long dissolution time, high construction cost, etc., and achieve low fluid loss, The effect of low price and reduction of construction cost

Inactive Publication Date: 2020-01-21
陕西博世威科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used acid thickeners generally have the disadvantages of high initial viscosity, long dissolution time, and high construction cost; in addition, there are poor thickening properties at high temperatures, and they are not temperature-resistant, especially after the acid-rock reaction. + Disadvantages of decreased concentration and increased fluid loss

Method used

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  • Temperature-sensitive acid liquid thickening agent for acid fracturing and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present invention is a temperature-sensitive acid thickener for acid fracturing, which is prepared through the following steps:

[0031] 1) Use AM, vinyl chitooligosaccharide, sodium 2-methyl-2-acrylamidopropanesulfonate and diacetone acrylamide as comonomers, and the molar ratio of the four monomers is AM: vinyl chitooligosaccharide Sugar (50% cationic degree): sodium 2-methyl-2-acrylamidopropanesulfonate: diacetone acrylamide = 100: 10: 2.5: 3.5, add the four monomers into water and stir to dissolve;

[0032] 2) Adjust the reaction system to 25°C, adjust the pH value of the system to 6.8, blow in high-purity nitrogen for 20 minutes, and then add an initiator accounting for 0.05% of the total monomer mass to initiate polymerization;

[0033] 3) The polymerization reaction is carried out under heat preservation and airtight conditions. When the reaction system reaches the highest temperature, the reaction is continued for 2 hours, and then the colloid is taken out f...

Embodiment 2

[0036] The present invention is a temperature-sensitive acid thickener for acid fracturing, which is prepared through the following steps:

[0037] 1) Use AM, vinyl chitooligosaccharide, sodium vinylbenzene sulfonate and dodecylphenol polyoxyethylene ether (18) acrylate as comonomers, and the feeding mole of the four monomers is AM: vinyl shell Polysaccharide (85% cationic degree): sodium vinylbenzene sulfonate: dodecylphenol polyoxyethylene ether (20) acrylate = 100:1:4:3, add the four monomers into water and stir to dissolve;

[0038] 2) Adjust the reaction system to 50°C, adjust the pH value of the system to 7.6, blow in high-purity nitrogen for 20 minutes, and then add an initiator accounting for 0.03% of the total monomer mass to initiate polymerization;

[0039] 3) The polymerization reaction is carried out under heat preservation and airtight conditions. When the reaction system reaches the highest temperature, the reaction is continued for 2 hours, and then the colloid...

Embodiment 3

[0042] The present invention is a temperature-sensitive acid thickener for acid fracturing, which is prepared through the following steps:

[0043] 1) Use AM, vinyl chitosan, sodium vinyl sulfonate and dodecylphenol polyoxyethylene ether (18) acrylate as comonomers, and the feeding mole of the four monomers is AM: vinyl chitosan Sugar (65% cationic degree): sodium vinyl sulfonate: dodecylphenol polyoxyethylene ether (20) acrylate = 100: 2.6: 2: 5, add the four monomers into water and stir to dissolve;

[0044] 2) Adjust the reaction system to 30°C, adjust the pH value of the system to 7, blow in high-purity nitrogen for 20 minutes, and then add an initiator accounting for 0.02% of the total monomer mass to initiate polymerization;

[0045] 3) The polymerization reaction is carried out under heat preservation and airtight conditions. When the reaction system reaches the highest temperature, the reaction is continued for 2 hours, and then the colloid is taken out for granulation...

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Abstract

The invention discloses a temperature-sensitive acid liquid thickening agent for acid fracturing, which belongs to the technical field of oilfield development, is a quadripolymer, and is formed by quaternary copolymerization of acrylamide, a bio-based cationic monomer, a temperature-resistant salt-resistant monomer and a temperature-sensitive monomer. The thickening agent has good solubility in acid liquor and has thermosensitivity and pH sensitivity, wherein the viscosity of the solution is greatly increased along with temperature rising and acid rock reaction, so that the crack width is increased, and the stratum permeability is improved, and the invention further discloses a preparation method of the thickening agent.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a temperature-sensitive acid thickener for acid fracturing and a preparation method thereof. Background technique [0002] With the rapid development of the petroleum industry, the field of petroleum and natural gas exploration continues to expand, and a large number of carbonate reservoirs and sandstone reservoirs are gradually discovered. At present, one (or several) acid liquids or acid mixed liquids are injected into the formation through the oil and gas wellbore, and the H in the acid liquid is used to + Chemically react with some minerals in the formation, dissolve the pore or fracture wall rock cement in the reservoir to increase the permeability of the formation, remove the pollution near the bottom of the injection well (water well) of the production well, and restore the permeability of the formation, thereby Relieve the damage caused to the formation nea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F290/06C08F220/56C08F220/58C08F212/14C09K8/74
CPCC09K8/74C08F251/00C08F290/062C08F220/56C08F220/58C08F212/14
Inventor 罗杨张建文徐兴海
Owner 陕西博世威科技有限责任公司
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