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Efficient cross-linking and low damage fracturing fluid

A fracturing fluid and high-efficiency technology, applied in the field of fracturing fluid, can solve the problems of low cross-linking efficiency and large damage of fracturing fluid, and achieve the effects of ensuring matrix permeability, improving flowback efficiency, and improving transformation effect.

Inactive Publication Date: 2019-11-12
北京宝丰春石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cross-linking efficiency of existing fracturing fluids is relatively low, and the damage caused by clay swelling and migration is relatively large. Therefore, we propose a high-efficiency and low-damage fracturing fluid

Method used

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  • Efficient cross-linking and low damage fracturing fluid
  • Efficient cross-linking and low damage fracturing fluid
  • Efficient cross-linking and low damage fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. A high-efficiency and low-damage fracturing fluid is characterized in that, in terms of mass percentages, it includes 25% of thickening agent, 15% of crosslinking agent, 0.06% of pH regulator, 0.1% of clay stabilizer, 0.8% % drainage aid, 0.5% waterproof lock agent, 0.01% fungicide, 0.01% gel breaker, 40% water;

[0024] The preparation method of fracturing fluid is as follows:

[0025] (1) According to the proportion, add 40% of water, 25% of thickener and 15% of crosslinking agent into the reactor, and make it fully stirred and mixed at 200r / min.

[0026] (2) Add 15% of cross-linking agent, 0.06% of PH regulator, 0.1% of clay stabilizer, 0.8% of drainage aid, 0.5% of water-proof locking agent and 0.01% of the solution obtained in the first step The gel breaker is mixed again at a high speed of 1000r / min;

[0027] (3) Add 0.06% pH regulator to the solution in step 2 to make the solution weakly alkaline, and continue to stir and mix it at 1000r / min;

[0028] (4) ...

Embodiment 2

[0037] A high-efficiency and low-damage fracturing fluid, characterized in that, in terms of mass percentages: it includes 25%-65% of thickener, 23% of cross-linking agent, 0.1% of pH regulator, and 0.18% of clay stabilizer Agent, 1.2% drainage aid, 0.8% waterproof lock agent, 0.03% gel breaker and 50% water;

[0038] The preparation method of fracturing fluid is as follows:

[0039] (1) According to the proportion, add 50% water, 30% thickener and 23% crosslinking agent to the reaction kettle, and make it fully stirred and mixed at 200r / min.

[0040] (2) Add 23% of cross-linking agent, 0.1% of PH regulator, 0.18% of clay stabilizer, 1.2% of drainage aid, 0.8% of waterproofing agent and 0.03% of the solution obtained in the first step The gel breaker is mixed again at a high speed of 1000r / min;

[0041] (3) Add 0.1% of the pH regulator of the pH regulator to the solution in step 2 to make the solution weakly alkaline, and continue to stir and mix it at 1000r / min;

[0042] (...

Embodiment 3

[0051] 2. A high-efficiency and low-injury fracturing fluid is characterized in that, in terms of mass percentage, it includes 50% of thickener, 40% of crosslinking agent, 1% of pH regulator, 0.3% of clay stabilizer, 2% % drainage aid, 2% waterproof lock agent, 0.06% fungicide, 0.05% gel breaker and 60% water;

[0052] The preparation method of fracturing fluid is as follows:

[0053] (1) According to the proportion, add 60% of water, 50% of thickener and 45% of crosslinking agent into the reaction kettle, and make it fully stirred and mixed at 200r / min.

[0054] (2) Add 45% cross-linking agent, 0.3% clay stabilizer, 2% drainage aid, 2% waterproof locking agent, 0.06% bactericide and 0.05% to the solution obtained in the first step Gel breaker, again carry out 1000r / min high-speed stirring and mixing;

[0055] (3) Add 1% pH regulator to the solution in step 2 to make the solution weakly alkaline, and continue to stir and mix it at 1000r / min;

[0056](4) Add 0.06% bacterici...

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Abstract

The invention discloses efficient cross-linking and low damage fracturing fluid. The efficient cross-linking and low damage fracturing fluid is prepared from the components in percentage by mass: 25%-65% of a thickening agent, 15%-45% of a cross-linking agent, 0.06%-1% of a PH regulator, 0.1%-0.3% of a clay stabilizer, 0.8%-2% of a discharge aiding agent, 0.5%-2% of a waterproof locking agent, 0.01%-0.06% of a bactericide, 0.01%-0.05% of a gel breaker and 40%-60% of water. The fracturing fluid uses fast dissolving guar gum (super HPG), the swelling time is smaller than 3 min, continuous blending is met, material consumption is reduced, the gel state is good, the delayed cross-linking time can be regulated, friction resistance is effectively lowered, a powdery plugging agent is adopted to realize multilayer steering in seams and between the seams, a complex seam net is formed, the compact oil and gas transformation effect is improved, by setting one or more of montmorillonite, kaolin, illite or chlorite as the clay stabilizer and starting with dissecting of different clay mineral damage mechanisms, targeted technological means are adopted, clay mineral damage caused by extraneous fluids is controlled to the utmost extent, and thus the matrix permeability is ensured.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid, in particular to a high-efficiency combined low-damage fracturing fluid. Background technique [0002] Petroleum is an important strategic material of the country, which plays a pivotal role in the political and economic development of the country. The oil output of Daqing Oilfield accounts for 50% of the country's onshore oil output, making a great contribution to the country. However, after more than 40 years of development, Daqing Oilfield is also facing a great crisis. First, the oilfield has entered the late stage of high water cut, making mining difficult and costly; In order to achieve considerable industrial oil flow and obtain commercial exploitation value, fracturing needs to use fracturing fluid, which is mainly divided into oil-based There are three types of fracturing fluid, water-based fracturing fluid and foam fracturing fluid. Water-based fracturing fluid is widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90C09K8/84
CPCC09K8/685C09K8/845C09K8/90
Inventor 张刘杰
Owner 北京宝丰春石油技术有限公司
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