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Cross-linking reinforcing agent as well as preparation method thereof and fracturing fluid

A technology of cross-linking enhancer and fracturing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reservoir matrix permeability damage, increased residue content, and affecting fracturing effects, etc., to achieve Reduce residue content, improve temperature resistance and shear resistance, and improve fracturing effect

Inactive Publication Date: 2019-07-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: in the production process, the modified guar gum contains water-insoluble matter that cannot be removed, and the concentration of the modified guar gum in the fracturing fluid is increased. , will inevitably lead to an increase in the residue content after the fracturing fluid is broken, which will cause greater damage to the permeability of the reservoir matrix and seriously affect the fracturing effect

Method used

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  • Cross-linking reinforcing agent as well as preparation method thereof and fracturing fluid
  • Cross-linking reinforcing agent as well as preparation method thereof and fracturing fluid
  • Cross-linking reinforcing agent as well as preparation method thereof and fracturing fluid

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preparation example Construction

[0027] The embodiment of the present invention also provides a preparation method of the above-mentioned cross-linking enhancer, which includes the following steps: firstly add water into the container; then add polyhydric alcohol and oxygen-scavenging synergist, and stir;

[0028] Wherein, the polyhydric alcohol is glycerol; the oxygen-scavenging synergist is sodium thiosulfate.

[0029] When preparing the cross-linking enhancer, first add water to the container, turn on the stirring device, and then add polyols and oxygen-scavenging synergists to the container in sequence. The reason for this addition order is mainly to consider the formation of a solution Uniformity and security of the configuration process.

[0030] The cross-linking enhancer for boron cross-linked modified guar gum fracturing fluid has simple preparation process, safe use, and can meet the requirements of various preparation processes of different fracturing fluids.

[0031] Among them, the polyhydric al...

Embodiment 1

[0040] Based on 100 parts of the total solution mass of boron cross-linked modified guar gum fracturing fluid cross-linking enhancer, wherein: water accounts for 49 parts of the total solution mass, polyols account for 50 parts of the total solution mass, and oxygen-scavenging synergists account for the total solution 1 part by mass, first add water into the reaction kettle, turn on the stirring device, then add polyhydric alcohol and oxygen-scavenging synergist, and stir until a transparent and uniform solution is formed to obtain a cross-linking enhancer.

[0041] According to the formula "0.40% modified guar gum + 0.25% pH regulator + 0.5% anti-swelling agent + 0.5% drainage aid + 0.5% cross-linking enhancer", prepare 500mL fracturing fluid base fluid, stir and swell for 20min, then add cross-linking agent Linking agent 3mL to prepare boron cross-linked modified guar gum fracturing fluid.

[0042]Wherein, polyhydric alcohol is glycerol, and purity is the industrial grade pr...

Embodiment 2

[0053] Based on 100 parts of the total solution mass of boron cross-linked modified guar gum fracturing fluid cross-linking enhancer, wherein: water accounts for 68 parts of the total solution mass, polyols account for 30 parts of the total solution mass, and oxygen-scavenging synergists account for the total solution 2 parts by mass, first add water into the reaction kettle, turn on the stirring device, then add polyhydric alcohol and oxygen-scavenging synergist, and stir until a transparent and uniform solution is formed to obtain a cross-linking enhancer.

[0054] According to the formula "0.3% modified guar gum + 0.1% pH regulator + 0.5% anti-swelling agent + 0.5% drainage aid + 0.3% cross-linking enhancer", prepare 500mL fracturing fluid base fluid, stir and swell for 20min, and then add cross-linking agent Linking agent 2mL to prepare boron cross-linked modified guar gum fracturing fluid.

[0055] Wherein, polyhydric alcohol is glycerol, and purity is the industrial grad...

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Abstract

The invention relates to a cross-linking reinforcing agent used for boron cross-linking modified guar gum fracturing fluid, a preparation method of the cross-linking reinforcing agent and the boron cross-linking modified guar gum fracturing fluid prepared from the cross-linking reinforcing agent, and belongs to the technical field of modified guar gum fracturing fluids. Specifically, in the embodiments of the invention, a cross-linking reinforcing agent is prepared by adopting glycerin, sodium thiosulfate and water, when the prepared cross-linking reinforcing agent is added into the boron cross-linking modified guar gum fracturing fluid, the temperature resistance and shear resistance of the fracturing liquid can be improved, a use concentration of the modified guar gum at the same temperature can be greatly reduced, a residue content after gel breaking can be reduced, damage to reservoir matrix permeability can be avoided, and the fracturing effect is improved.

Description

technical field [0001] The invention relates to the technical field of modified guar gum fracturing fluid, in particular to a crosslinking enhancer for boron crosslinked modified guar gum fracturing fluid, a preparation method thereof, and a boron crosslinking enhancer prepared by the crosslinking enhancer. Joint modified guar gum fracturing fluid. Background technique [0002] Hydraulic fracturing technology is an important measure to increase production in low-permeability oil and gas fields. The cross-linking and rheological properties of the fracturing fluid used in the fracturing process will directly affect the effect of hydraulic fracturing. Currently the commonly used fracturing fluid is boron cross-linked modified guar gum fracturing fluid, which has mature preparation technology, excellent performance, low cost, simple preparation process and easy-to-obtain raw materials, and is widely used in hydraulic fracturing technology. [0003] However, with the deepening o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685
Inventor 陈紫薇张胜传李晓娟隋向云刘学伟王娟周震张润泽田福春
Owner PETROCHINA CO LTD
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