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A hilly laying method and application of a magnetic proppant

A proppant and magnetic technology, applied in the field of oil and gas field development and research, can solve the problems of lack of proppant, difficult to form pillars, affecting the effect of fracturing, etc., to improve gas recovery, improve oil and gas seepage capacity, and improve conductivity Effect

Inactive Publication Date: 2021-05-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to implement on site. It is difficult to achieve non-uniform dispersion and laying of proppant, and it is even more difficult to form "pillars". In addition, there is a large area of ​​lack of proppant filling in fractures, which leads to fracture closure and affects fracturing. Effect

Method used

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  • A hilly laying method and application of a magnetic proppant
  • A hilly laying method and application of a magnetic proppant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A method of hilly placement of magnetic proppant comprising:

[0051] Mix the fluid medium containing magnetic proppant and the fluid medium containing iron-containing proppant in the fracturing fractures of the formation: the iron-containing proppant is adsorbed around the magnetic proppant due to magnetic attraction, thereby forming a hilly pavement place.

[0052] The fluid medium containing the magnetic proppant is a high-viscosity sand-carrying fluid, and the fluid medium containing the iron-containing proppant is a low-viscosity intermediate displacement fluid. Wherein, the viscosity range of the high-viscosity sand-carrying fluid is greater than or equal to 50mPa·s and less than or equal to 80mPa·s; the viscosity range of the low-viscosity intermediate displacement fluid is greater than or equal to 30mPa·s and less than 40mPa·s.

Embodiment 2

[0054] The hilly laying method of described magnetic proppant is specifically as follows:

[0055] Preparation of high-viscosity sand-carrying fluid: Under the action of an external magnetic field, mix the magnetic proppant and high-viscosity fracturing fluid evenly at a sand ratio of 5% to 10%, and the strength of the external magnetic field is such that after the external magnetic field disappears, The magnetic proppant will not attract together; the viscosity range of the high-viscosity fracturing fluid is greater than or equal to 60mPa·s and less than or equal to 80mPa·s;

[0056] Preparation of low-viscosity intermediate displacement fluid: mix iron-containing proppant and low-viscosity fracturing fluid in a sand mixing vehicle at a sand ratio of 20% to 40%, and the viscosity range of the low-viscosity fracturing fluid is greater than or equal to 40mPa·s , less than 50mPa·s;

[0057] Fracturing fractures: pump pre-fluid into the formation to form fractures in the formati...

Embodiment 3

[0061] The hilly laying method of magnetic proppant as described in Example 2, the difference is that, in the stage of injecting high-viscosity sand-carrying liquid and low-viscosity intermediate displacement liquid, cyclically inject high-viscosity sand-carrying liquid and low-viscosity sand-carrying liquid into the fracture Low viscosity intermediate displacement fluid.

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Abstract

The invention relates to a hilly laying method and application of a magnetic proppant, and belongs to the technical field of oil and gas field development and research. A method for laying a magnetic proppant in a hilly manner, comprising: mixing a fluid medium containing a magnetic proppant and a fluid medium containing an iron-containing proppant in a fracturing fracture of a formation: the iron-containing proppant is absorbed by the The magnetic proppant is adsorbed around the magnetic proppant to form a hilly laying method; the invention also discloses a hilly laying method of the magnetic proppant, which can be used to exploit oil and gas in oil and gas exploitation, and to return fracturing fluid after fracturing in oil and gas exploitation. Applications in drainage, hydraulic fracturing, and geothermal energy development. The present invention changes conventional uniform laying into non-uniform scattered laying, forming unobstructed flow passages between hills, and numerous flow passages form a network, thereby realizing the form of large cracks containing many small cracks, which greatly improves the Material exchange capacity between cracks.

Description

technical field [0001] The invention relates to a hilly laying method and application of a magnetic proppant, and belongs to the technical field of oil and gas field development and research. Background technique [0002] Low-permeability and ultra-low-permeability oil and gas reservoirs are widely distributed in my country. Most of the low-permeability oil and gas reservoirs are difficult to obtain industrial oil and gas without reservoir stimulation. At present, hydraulic fracturing technology is the main measure for oil and gas reservoir stimulation. The purpose of hydraulic fracturing is to create a flow path from the formation to the wellbore, increasing the productivity of oil and gas wells. Conventional fracturing technology usually uses proppant to fill fractures, keep the fractures open, and make the fractures have high conductivity, so as to establish effective production channels. Therefore, in hydraulic fracturing, the placement of proppant in the fracture plays...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 赫文强刘均荣
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)