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Bio-enzyme gel breaker, and applications thereof

A technology of gel breaker and biological enzyme, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve the problems that water-based gel fracturing fluid cannot be effectively broken quickly

Inactive Publication Date: 2015-07-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that the existing biological enzyme products cannot effectively realize the rapid gel breaking of water-based jelly fracturing fluid, the present invention provides a composite enzyme system for biological gel breaking of water-based jelly fracturing fluid, which is especially suitable for Gel fracturing fluid system

Method used

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  • Bio-enzyme gel breaker, and applications thereof
  • Bio-enzyme gel breaker, and applications thereof
  • Bio-enzyme gel breaker, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Fracturing fluid base fluid formula: potassium chloride 2.0%, coumarin 0.3%, demulsifier 0.1%, drainage aid 0.1%. Prepare fracturing fluid base fluid according to the above formula, swell for more than 4 hours, and use it for later use.

[0026] 1) Prepare 1.0% borax decahydrate solution as the fracturing fluid cross-linking agent, and add β-mannanase and α-galactosidase to the cross-linking agent liquid to make the final concentration reach 200U / mL and 100U / mL.

[0027] 2) Prepare 1.0% borax decahydrate solution as the fracturing fluid cross-linking agent, and add β-mannanase and α-galactosidase to the cross-linking agent liquid to make the final concentration reach 80 U / mL and 40U / mL.

[0028] Take the above-mentioned crosslinking agent added with gel breaker, and prepare 100mL fracturing fluid with a crosslinking ratio (volume ratio) of 100:5, and 170s at 20℃ -1 Shear for 60 minutes and record the fracturing fluid viscosity-temperature curve, such as figure 1 Shown.

Embodiment 2

[0034] Formula of fracturing fluid base fluid: potassium chloride 2.0%, coumadin 0.35%, demulsifier 0.1%, drainage aid 0.1%. Prepare fracturing fluid base fluid according to the above formula, swell for more than 4 hours, and use it for later use.

[0035] 1) Prepare 1.0% borax decahydrate solution as the fracturing fluid cross-linking agent, and add β-mannanase and α-galactosidase to the cross-linking agent liquid to make the final concentration reach 120U / mL and 60U / mL.

[0036] 2) Prepare 1.0% borax decahydrate solution as the fracturing fluid cross-linking agent, and add β-mannanase and α-galactosidase to the cross-linking agent liquid to make the final concentration reach 50U / mL and 25U / mL.

[0037] Take the above-mentioned cross-linking agent added with gel breaker and prepare 100 mL fracturing fluid with a cross-linking ratio (volume ratio) of 100:5, and 170s at 40°C -1 Shear for 60 minutes and record the fracturing fluid viscosity-temperature curve, such as figure 2 Shown....

Embodiment 3

[0043] Formula of fracturing fluid base fluid: potassium chloride 2.0%, coumadin 0.4%, demulsifier 0.1%, drainage aid 0.1%. Prepare fracturing fluid base fluid according to the above formula, swell for more than 4 hours, and use it for later use.

[0044] 1) Prepare 1.0% borax decahydrate solution as the fracturing fluid cross-linking agent, and add β-mannanase and α-galactosidase to the cross-linking agent liquid to make the final concentration reach 80 U / mL and 40U / mL.

[0045] 2) Prepare 1.0% borax decahydrate solution as the fracturing fluid cross-linking agent, and add β-mannanase and α-galactosidase to the cross-linking agent liquid to make the final concentration reach 40 U / mL and 20U / mL.

[0046] Take the above-mentioned cross-linking agent added with gel breaker, and prepare 100mL fracturing fluid with a cross-linking ratio (volume ratio) of 100:5, and 170s at 60°C -1 Shear for 60 minutes and record the fracturing fluid viscosity-temperature curve, such as image 3 Shown....

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Abstract

The invention relates to bio-enzyme gel breaker and applications thereof. The bio-enzyme gel breaker is an aqueous solution of beta-mannanase, alpha-galactosidase, and a cross-linking agent. According to an application method, by volume, 80 to 120 parts of a fracturing fluid base solution is mixed with 5 to 10 parts of the bio-enzyme gel breaker, and after gel forming, an obtained mixture is taken as a fracturing fluid. According to applications, galactosidase is used for removing a part of galactose residues on the side chains of galactomannan, so that mannose glycosidic bonds on the main chain of galactomannans are exposed, and then degradation effect of mannanase is adopted for selective degradation of galactomannan. Combination of the above two enzymes is capable of realizing high-efficiency rapid gel breaking of the fracturing fluid, reducing molecular weight of gel breaking products greatly, and reducing reservoir damage.

Description

Technical field [0001] The invention relates to a biological enzyme gel breaker and its application. Background technique [0002] Thickener is the main additive in water-based fracturing fluid, and its performance has an important impact on the overall performance of the fracturing fluid and the effect of fracturing construction. Especially when facing the development of reservoirs with high temperature, low permeability and severe formation sensitivity, seeking thickeners with stronger thickening ability, less damage to the formation, and better high temperature stability has gradually become the research direction of domestic and foreign scholars. There are many types of water-based fracturing fluid thickeners currently in use, which are mainly divided into natural vegetable gums and their derivatives, synthetic high molecular polymers and so on. Among them, vegetable gum has strong thickening ability, is easy to cross-link into jelly, and has stable performance. It is the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/665C09K8/887C09K8/905C09K2208/24
Inventor 郑承纲张锁兵张大年贺甲元林鑫汪友平
Owner CHINA PETROLEUM & CHEM CORP
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