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Multifunctional composite fracturing liquid system

A composite fracturing and multi-functional technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of complex flowback fluid composition, complex fluid mixing process, and increased difficulty in quality control

Active Publication Date: 2016-01-06
SICHUAN GUANGYA POLYMER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are different types of water-resistance and jelly fracturing fluid additives, and in order to meet the needs of various formations, there are many types of additives, and it is more difficult to control the quality of raw materials when purchasing raw materials. Crack construction process), consumes a lot of manpower and material resources
In addition, with the continuous improvement of environmental protection requirements and the scarcity of water resources, it is required to reduce the amount of working fluid required for fracturing stimulation, and at the same time "zero discharge" the wastewater of fracturing fluid stimulation working fluid, and treat all the flowback fluid after fracturing , recovery or re-injection into the formation, while there are many types of jelly fracturing fluid additives, the composition of the flowback fluid is complex, and the cost of recovery and treatment is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The associative polymer used as a drag reducing agent is hydrophobically modified hydroxyethyl cellulose, 0.05wt%; the synergist is sodium dodecylbenzenesulfonate (sodium dodecylbenzenesulfonate), 0.2wt% ; The clay stabilizer is KCl, 1wt%.

[0076] Use a balance to weigh the water (clear water) for preparing water resistance reduction, pour it into the mixer, adjust the speed of the mixer until the middle axis at the bottom of the mixer is seen, and then slowly add the associated polymer into the mixer to ensure that the associated polymer is dispersed Evenly without agglomeration, stir for 2-3 minutes, then add synergist and clay stabilizer, and continue stirring for 1-2 minutes to obtain water resistance reduction.

[0077] Test (25° C.) the drag-reducing water friction obtained in Example 1 to obtain a relational curve between its friction and displacement, as shown in figure 1 As shown, wherein D is the water resistance reduction obtained in Example 1. It can be s...

Embodiment 2

[0081] The associative polymer used as drag reducing agent is Sichuan Guangya Polymer Chemical Co., Ltd. associative non-crosslinked fracturing thickener GRF-1C, 0.08wt% (effective concentration of associative polymer); the synergist is GRF-2C, 0.2wt%; clay stabilizer is KCl, 1wt%.

[0082] Use a balance to weigh the water (clear water) for preparing water resistance reduction, pour it into the mixer, adjust the speed of the mixer until the middle axis at the bottom of the mixer is seen, and then slowly add the associated polymer into the mixer to ensure that the associated polymer is dispersed Evenly without agglomeration, stir for 2-3 minutes, then add synergist and clay stabilizer, and continue stirring for 1-2 minutes to obtain water resistance reduction.

[0083] Test (25° C.) the drag-reducing water friction obtained in Example 2 to obtain a relational curve between its friction and displacement, as shown in figure 1 Shown, wherein B is the water resistance reduction ob...

Embodiment 3

[0088] The associative polymer used as drag reducing agent is Sichuan Guangya Polymer Chemical Co., Ltd. associative non-crosslinked fracturing thickener GRF-1H, 0.1wt%; the synergist is GRF-2B, 0.15wt%; The clay stabilizer is KCl, 1 wt%.

[0089] Use a balance to weigh the water (clear water) for preparing water resistance reduction, pour it into the mixer, adjust the speed of the mixer until the middle axis at the bottom of the mixer is seen, and then slowly add the associated polymer into the mixer to ensure that the associated polymer is dispersed Evenly without agglomeration, stir for 2-3 minutes, then add synergist and clay stabilizer, and continue stirring for 1-2 minutes to obtain water resistance reduction.

[0090] Test (25° C.) the drag-reducing water friction obtained in Example 3 to obtain a relational curve of its friction and displacement, as shown in figure 1 As shown, wherein C is the anti-resistance water obtained in Example 3, A is 0.1wt% anionic polyacryla...

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Abstract

The invention provides a multifunctional composite fracturing liquid system. The multifunctional composite fracturing liquid system comprises resistance reduction water and high-viscosity sand carrying liquid, wherein the resistance reduction water comprises 0.02 to 0.15 percent by weight of the resistance reduction agent; the high-viscosity sand carrying liquid comprises 0.2 to 0.75 percent by weight of a thickening agent; the resistance reduction agent and the thickening agent are identical aggregation polymer and are natural modified aggregation polymer and / or organic synthetic aggregation polymer. The low-concentration aggregation polymer having good resistance reduction performance and the high-concentration aggregation polymer having good sand carrying performance are used for forming the multifunctional composite fracturing liquid system; compared with the existing composite fracturing liquid system, the multifunctional composite fracturing liquid system has characteristics of fewer types of additives, simple formula and simple preparation process; meanwhile, the system has good resistance reduction performance, shear resistance and sand carrying performance; return liquid of the system can be reused after being treated in a way such as flocculating, precipitating and filtering, and the utilization rate of water for fracturing is increased.

Description

technical field [0001] The invention belongs to the technical field of fracturing reconstruction of oil and gas reservoirs, and in particular relates to a multifunctional composite fracturing fluid system suitable for tight oil and gas reservoirs and shale oil and gas reservoirs. Background technique [0002] There are abundant unconventional oil and gas resources at home and abroad, among which low-permeability and ultra-low-permeability oil and gas reservoirs account for a huge proportion. Due to the low permeability and small porosity of low-permeability oil and gas reservoirs, it must be reformed to form a complex fracture network to increase production. At home and abroad, hydraulic fracturing technology is mainly used for low-permeability oil and gas reservoir stimulation. The commonly used fracturing fluid is guar gum fracturing fluid. When using guar gum as a thickener, in order to form enough viscosity to meet the requirements of suspended sand, usually A cross-lin...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K8/90C09K8/882C09K2208/12C09K2208/26C09K2208/28C09K8/665
Inventor 郭拥军罗平亚王翔刘宽
Owner SICHUAN GUANGYA POLYMER CHEM
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