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Drag-reduction water system, preparation method and application

A drag-reducing water and system technology, applied in the field of shale reservoir fracturing, can solve the problems of increased transportation costs and material costs, unknown formation damage, complex preparation process, etc., achieving low cost, small formation damage, and less dosage Effect

Active Publication Date: 2015-01-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing drag reducing water system has the following deficiencies: ①The drag reducing agents used are emulsion type, the preparation process is complicated, and the damage of the formed microemulsion system to the formation is unknown; ②Under the same index conditions, the additives in the system such as anti The high concentration of swelling agent and drainage aid will increase the transportation cost and material cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Measure 500ml of water and pour it into the stirring container, adjust the speed of the agitator until the vortex formed by the liquid can see the top of the central axis of the agitator blade. Slowly add 0.02% drag reducer JC-J10 (product of Jianghan Oilfield Oil Production Institute), stir for 1min to dissolve, then add 0.1% composite anti-swelling agent JC-FC03 (product of Jianghan Oilfield Oil Production Institute), 0.2% composite synergist JC -ZP2 (product of Jianghan Oilfield Oil Production Institute). After adding all the additives, continue to stir for 5 minutes to form a uniform solution, then stop stirring. According to the standard of "Technical Conditions of Reducing Water for Shale Gas Fracturing", the related performance of drag reducing water was tested. The measured kinematic viscosity of the drag reducing water is 5.5mPa·s, the drag reducing rate is 74.6%, the pH of the drag reducing water measured by a pH meter is 6.75, the anti-swelling rate is 74.7%...

Embodiment 2

[0024] Measure 495ml of water and pour it into the stirring container, adjust the speed of the agitator until the vortex formed by the liquid can be seen on the top of the central shaft of the agitator blade. Slowly add 0.05% drag reducer JC-J10 (product of Jianghan Oilfield Oil Production Institute), stir for 1 minute to dissolve, then add 0.5% composite anti-swelling agent JC-FC03 (product of Jianghan Oilfield Oil Production Institute), 0.08% composite synergist JC -ZP2 (product of Jianghan Oilfield Oil Production Institute). After adding all the additives, continue to stir for 5 minutes to form a uniform solution, then stop stirring. The measured kinematic viscosity of the drag reducing water is 5.4mPa·s, the drag reducing rate is 74.6%, the pH of the drag reducing water measured by pH meter is 6.8, the anti-swelling rate is 90.5%, the surface tension is 28.9mN / m, and the interfacial tension is 2.8mN / m, the permeability damage rate of the core is about 8.0%.

Embodiment 3

[0026] Measure 500ml of water and pour it into the stirring container, adjust the speed of the agitator until the vortex formed by the liquid can see the top of the central axis of the agitator blade. Slowly add 0.1% drag reducer JC-J10 (product of Jianghan Oilfield Oil Production Institute), stir for 1 minute to dissolve, then add 1.0% composite anti-swelling agent JC-FC03 (product of Jianghan Oilfield Oil Production Institute), 0.3% composite synergist JC -ZP2 (product of Jianghan Oilfield Oil Production Institute). After adding all the additives, continue to stir for 5 minutes to form a uniform solution, then stop stirring. The measured kinematic viscosity of the drag reducing water is 8.4mPa·s, the drag reducing rate is 78.4%, the pH of the drag reducing water measured by pH meter is 7.0, the anti-swelling rate is 90.5%, the surface tension is 28.2mN / m, and the interfacial tension is 2.2mN / m, the permeability damage rate of the core is about 10.6%.

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Abstract

The invention discloses a drag-reduction water system, a preparation method and application. The drag-reduction water system includes the following components according to weight percentages: 0.02 to 0.1 percent of a drag reducer JC-J10, 0.08 to 0.5 percent of a compound synergist JC-ZP2, 0.1 to 1.0 percent of a compound anti-swelling agent JC-FC03, and the balance of water. The preparation method includes the following steps: the drag reducer with the mentioned percentage is added into water, the mixture is stirred for dissolution, the compound anti-swelling agent and the compound synergist with the mentioned percentages are then added in sequence, and the mixture is stirred uniformly, so as to obtain the drag-reduction water system. The drag-reduction water system provided by the invention has the characteristics of no residues, good fast-dissolving property, high drag reduction rate (larger than 70 percent) and good anti-swelling performance, and can satisfy the requirement for continuous mixing of large liquid volumes under a complex mountainous environment; moreover, the formation of network cracks is facilitated, so as to greatly enlarge the crack volume and improve the fracturing effect.

Description

technical field [0001] The invention relates to the field of shale reservoir fracturing, and furthermore, relates to a drag-reducing water system, a preparation method and an application. Background technique [0002] The geological resources of shale gas in the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation mud shale section in the first phase production and construction area of ​​Jiaoshiba area, Fuling is 869.07×10 8 m 3 , the amount of recoverable resources is 173.88~347.76×10 8 m 3 . For the Longmaxi marine shale gas reservoir whose storage space is dominated by micro-pores and nano-scale pores, in order to obtain higher production, it is necessary to base the overall development of well pattern deployment and use horizontal wells to Drag-reducing water + glue” is used to add sand and fracturing in stages to improve the conductivity of the reservoir and expand the venting area. [0003] At present, domestic patents 201110401452.7, 201310020401.9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/68C09K8/882C09K2208/12C09K2208/28
Inventor 韩玲刘炜吴雷泽陈建达黄亚杰李远照
Owner CHINA PETROLEUM & CHEM CORP
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