Resistance-reducing agent used for reusable slippery water fracturing fluid and preparation method thereof

A drag-reducing agent and water fracturing technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems affecting fracturing fluid flowback, environmental pollution, and increased production costs, and achieve swelling and drag reduction Outstanding performance, avoiding the risk of environmental pollution, and reducing the cost of raw materials

Inactive Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of organic solvents (oil phase) are used in the synthesis process, which not only causes the production cost of the product to increase, but also easily causes environmental pollution and potential safety hazards.
In addition, the addition of oil-phase substances in the slick water fracturing fluid tends to form emulsified droplets in the reservoir and stay in the pore throat, causing the "Jiamin effect" to affect the flowback of the fracturing fluid, thus causing serious reservoir damage

Method used

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  • Resistance-reducing agent used for reusable slippery water fracturing fluid and preparation method thereof
  • Resistance-reducing agent used for reusable slippery water fracturing fluid and preparation method thereof
  • Resistance-reducing agent used for reusable slippery water fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0020] Examples 1-4 were implemented according to the following mass ratios and preparation conditions.

[0021]

[0022] The drag reducer prepared in Examples 1-4 was placed at room temperature for 3 months, sealed and kept away from light, and the appearance and system stability of the drag reducer were observed. The results are shown in Table 1.

[0023] The drag reducing agents prepared in Examples 1-4 were diluted 1000 times respectively, and a drag reducing agent solution with a mass concentration of 0.1% was prepared. The swelling endpoint was recorded when the viscosity of the solution no longer increased. The results are shown in Table 1.

[0024] The drag-reducing performance of the drag-reducing agent is specifically manifested in the acceleration of the flow rate of the drag-reducing agent solution and the reduction of the frictional pressure drop. When the flow rate is constant, the drag-reducing effect is manifested in the reduction of the frictional pressure d...

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Abstract

The invention provides a resistance-reducing agent used for reusable slippery water fracturing fluid. The resistance-reducing agent comprises the following components in parts by weight: 25-30 parts of inorganic salt, 10-20 parts of a dispersant, 2-8 parts of a cation monomer, 18-32 parts of a nonionic monomer, 0.0002-0.0005 parts of an initiator. The invention also provides a preparation method of the resistance-reducing agent and an application of the resistance-reducing agent in shale gas fracturing fluid construction. The resistance-reducing agent is a water-in-water emulsion type, keeps excellent resistance-reducing and dissolving performances of the traditional emulsion-type polyacrylamide resistance-reducing agents, can avoid massive usage of an organic solvent during a production process, can greatly reduce the production cost, and can effectively reduce the reservoir damage and environment risk during fracturing construction.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to a drag reducing agent for slick water fracturing fluid and a preparation method thereof. The drag reducing agent is especially suitable for shale gas fracturing construction. Background technique [0002] With the depletion of conventional oil and gas resources, the development of unconventional oil and gas resources has attracted more and more attention worldwide, and people urgently need to find suitable replacement resources. According to the forecast and statistics of the World Oil and Gas Magazine in 2009, the world's shale gas reserves are about 4.6×10 14 m 3 , the amount of resources is very rich. [0003] Shale gas reservoirs have ultra-low permeability, large thickness, and well-developed natural fractures, requiring hydraulic fracturing to achieve industrial exploitation value. Although the conventional vegetable gum fracturing fluid syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/54C08F226/02C09K8/68
Inventor 郑承纲苏建政赵崇镇马玉生赵梦云王连生李颖史爱萍张大年
Owner CHINA PETROLEUM & CHEM CORP
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