Fracturing fluid system of CO2 cleaning foam

A technology for cleaning foam and fracturing fluid, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as damage to the conductivity of propped fractures and affect fracturing effects, and achieve good foaming and easy control , The effect of high foam stability

Inactive Publication Date: 2011-04-27
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of acidic cross-linked guar gum CO 2 Since the foam fracturing fluid system uses guar gum derivatives as thickeners, it contains a certain amount of water-insoluble substances, and residues are left after the gel is broken, which will damage the conductivity of propped fractures and affect the final fracturing effect

Method used

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  • Fracturing fluid system of CO2 cleaning foam
  • Fracturing fluid system of CO2 cleaning foam
  • Fracturing fluid system of CO2 cleaning foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a CO 2 Clean foam fracturing fluid system, its optimal components are composed of the following mass percentages: 0.55% water-soluble hydrophobic association polymer, 0.35% rheological additive, 1.0% clay stabilizer, foaming agent 0.2%, gel breaker 0.03%, liquid CO 2 is 55.0%, and the balance is water. The water-soluble hydrophobic association polymer is composed of acrylamide, sodium acrylate, allyl-alkylphenyl ether monomer, and initiator. The specific synthesis method and ratio See Chinese patent CN200510022249.3; the rheological additive is composed of the following components in mass percentage: zwitterionic surfactant is 10%, nonionic surfactant is 5%, nonionic fluorocarbon surfactant FCN -18 is 1%, and the balance is water, wherein the zwitterionic surfactant is the cocoyl propyl betaine CAB-35 with a concentration of 10%, and the nonionic surfactant is a concentration of 5%. Alkyl polyglucoside C8-C10; The use concentration of nonionic fluorocarbon surfactant...

Embodiment 2

[0021] a CO 2 Clean foam fracturing fluid system, its components are composed of the following mass percentages: 0.3% of water-soluble hydrophobic association polymer, 0.25% of rheological additive, 0.5% of clay stabilizer, and 0.1% of foaming agent %, gel breaker is 0.01%, liquid CO 2The water-soluble hydrophobic association polymer is 30.0% and the balance is water. The water-soluble hydrophobic association polymer is composed of acrylamide, sodium acrylate, allyl-alkylphenyl ether monomer and initiator. For the specific synthesis method and ratio, please refer to China Patent CN200510022249.3; the rheology additive is composed of the following components in mass percentage: zwitterionic surfactant 9%, nonionic surfactant 4.5%, nonionic fluorocarbon surfactant FCN-18 is 1.1%, and the balance is water, wherein the zwitterionic surfactant is the cocoyl propyl betaine CAB-35 with a concentration of 9%, and the nonionic surfactant is an alkane with a concentration of 4.5%....

Embodiment 3

[0024] a CO 2 Clean foam fracturing fluid system, its components are composed of the following mass percentages: 0.8% of water-soluble hydrophobic association polymer, 0.55% of rheological additive, 3.0% of clay stabilizer, and 0.5% of foaming agent %, gel breaker is 0.2%, liquid CO 2 is 80.0%, and the balance is water. The water-soluble hydrophobic association polymer is composed of acrylamide, sodium acrylate, allyl-alkylphenyl ether monomer, and initiator. For specific synthesis methods and ratios, see China Patent CN200510022249.3; the rheological additive is composed of the following components in mass percentage: zwitterionic surfactant is 11%, nonionic surfactant is 5.5%, nonionic fluorocarbon surfactant FCN-18 3%, and the balance is water, wherein the zwitterionic surfactant is the cocoyl propyl betaine CAB-35 with a concentration of 11%, and the nonionic surfactant is an alkyl group with a concentration of 5.5%. The use concentration of polyglycoside C8-C10, non...

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Abstract

The invention relates to a fracturing fluid system used in an oil and gas field, in particular to a fracturing fluid system of CO2 cleaning foam. The fracturing fluid system comprises the following components in percentage by weight: 0.3-0.8 percent of water-soluble hydrophobic association polymer, 0.25-0.55 percent of rheological auxiliary agent, 0.5-3.0 percent of clay stabilizer, 0.1-0.5 percent of foaming agent, 0.01-0.2 percent of gel breaker, 30.0-80.0 percent of liquid CO2 and the balance of water. Compared with the prior art, in the fracturing fluid system of the CO2 cleaning foam, a cross-linking agent is not needed, the foamability is good, the foam stability is high, the sand-carrying capability is strong, gel breaking is easy to control, no residue is generated after gel breaking, the superficial/interfacial tension of gel-breaking liquid is low, and the damage to the formation is less, and therefore, the fracturing fluid system can be used for fracturing modification of hypoisotonic, low-pressure and water-sensitive storage layers at the temperature of 60-140 DEG C.

Description

technical field [0001] The invention relates to a fracturing fluid system used in an oil and gas field, specifically a CO 2 Clean foam fracturing fluid system. Background technique [0002] CO 2 Foam fracturing fluid is one of the core contents of foam fracturing technology, and its excellent performance is an important guarantee to ensure the success of fracturing construction. CO 2 Foam fracturing fluid made from CO 2 It is composed of water-based cross-linked jelly, and the pH value is about 3-4. Since conventional water-based fracturing fluids are usually cross-linked under alkaline conditions and broken under acidic conditions, acidic cross-linking is a CO 2 The key technology of foam fracturing fluid. At present, the domestically adopted CO 2 Foam fracturing fluid is mainly composed of AL-1 or AC-8 acidic cross-linked hydroxypropyl guar gum (HPG) jelly and CO 2 composition, in which AL-1 and AC-8 are acidic cross-linking agents; from the perspective of field ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/70
Inventor 王香增高瑞民吴金桥张军涛雷晓岚申峰李辉汶锋刚
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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