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Low-temperature low-damage shale gas slickwater fracturing fluid and preparation method thereof

A shale gas and water fracturing technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult flowback of fracturing fluid, easy retention of polymers, and damage to reservoirs, etc., to achieve Reduce the burden of environmental protection, improve the conductivity of cracks, and have good salt resistance

Inactive Publication Date: 2018-01-19
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the fracturing of these normal-pressure low-temperature well reservoirs, the main difficulty is that the slick water fracturing fluid polymer is easy to stay and cause damage to the reservoir; the fracturing fluid is not easy to flow back under normal pressure conditions

Method used

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  • Low-temperature low-damage shale gas slickwater fracturing fluid and preparation method thereof
  • Low-temperature low-damage shale gas slickwater fracturing fluid and preparation method thereof
  • Low-temperature low-damage shale gas slickwater fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 400g of tap water into a stirring container, add 0.10% drainage aid FLYZ and 0.20% clay stabilizer FLYF sequentially in mass percentage. Adjust the speed of the agitator to 1000-1500rad / min, and add 0.04% drag reducer (completely added within 30s), 0.005% destroyer BRE-1 and 0.005% destroyer BRE-2 (within 30s) under stirring condition finished), and stirred for 1 min to obtain a low-temperature low-damage slippery water system.

[0024] The slippery water that obtains in embodiment 1 is carried out drag reduction rate test, obtains its drag reduction rate and the relationship curve figure of shear rate, as figure 1 Shown, wherein A is the slick water obtained in Example 1. It can be seen from the figure that as the shear rate increases, the drag reduction rate of slick water gradually increases, indicating that slick water has better drag reduction performance.

[0025] Adopt HAKKE MARS 60 high temperature and high pressure rheometer to carry out frequency scann...

Embodiment 2

[0028] Weigh 400g of tap water into a stirring container, add 0.20% of drainage aid FLYZ and 0.30% of clay stabilizer FLYF in order by mass percentage. Adjust the speed of the agitator to 1000-1500rad / min, and add 0.08% drag reducer (completely added within 30s), 0.01% destroyer BRE-1 and 0.01% destroyer BRE-2 (within 30s) under stirring finished), and stirred for 1 min to obtain a low-temperature low-damage slippery water system.

[0029] The slippery water obtained in embodiment 2 is carried out drag reduction rate test, obtains its drag reduction rate and the relationship curve figure of shear rate, as figure 1 Shown, wherein B is the slippery water that obtains in embodiment 2.

[0030] The viscosity of slippery water obtained in Example 2, surface tension, anti-swelling rate, and viscosity and molecular weight after standing at room temperature for 24 hours were tested, and the results are shown in Table 1-Table 4.

Embodiment 3

[0032] Weigh 400g of tap water into a stirring container, and add 0.15% of the drainage aid FLYZ and 0.35% of the clay stabilizer FLYF in order by mass percentage. Adjust the speed of the agitator to 1000-1500rad / min, and add 0.06% drag reducer (completely added within 30s), 0.005% destroyer BRE-1 and 0.01% destroyer BRE-2 (within 30s) under stirring condition finished), and stirred for 1 min to obtain a low-temperature low-damage slippery water system.

[0033] The slippery water that obtains in embodiment 3 is carried out drag reduction rate test, obtains its drag reduction rate and the relationship curve figure of shear rate, as figure 1 Shown, wherein C is the slippery water that obtains in embodiment 3.

[0034] The viscosity of slippery water obtained in Example 3, surface tension, anti-swelling rate, and viscosity and molecular weight after standing at room temperature for 24 hours were tested, and the results are shown in Table 1-Table 4.

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Abstract

The invention relates to a low-temperature low-damage shale gas slickwater fracturing fluid and a preparation method thereof. The low-temperature low-damage shale gas slickwater fracturing fluid comprises the following components in percentage by mass: 0.01-0.08% of a drag reducer, 0.1-0.2% of a discharge aiding agent, 0.2-0.5% of a clay stabilizer, 0.005-0.02% of a polymer destroying agent and balance of water. The slickwater fracturing fluid provided by the invention has good salt tolerance, and flowback fluid is clear and transparent, contains no residue, does not need to be subjected to flocculation or precipitation treatment and can be repeatedly utilized directly or after being diluted with clear water, so that environmental protection burden is alleviated.

Description

technical field [0001] The invention relates to the technical field of shale oil and gas reservoir fracturing reconstruction, and more specifically relates to a low-temperature and low-damage shale gas slick water fracturing fluid and a preparation method thereof. Background technique [0002] In recent years, with the deepening of shale gas exploration and development, overpressured (formation pressure coefficient > 1.2) shale gas blocks represented by Jiaoshiba and Changning-Weiyuan have formed relatively mature fracturing supporting technologies. Most get industrial airflow. However, the atmospheric pressure (pressure coefficient 0.8-1.2) shale gas resources and reserves represented by Pengshui and Yichang are huge, and will become the focus of shale gas exploration and development. The temperature of these shale gas reservoirs is generally low, and they belong to low temperature reservoirs. For the fracturing of these normal-pressure low-temperature well reservoirs,...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/88
Inventor 闫秀王冰龚起雨胡光袁凯张骏超邰云龙
Owner 中石化石油工程技术服务有限公司
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