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Method for increasing fracturing volume in tight sandstone reservoir

A technology for tight sandstone and tight sandstone reservoirs, which is applied in the direction of exploitation fluid, earthwork drilling and production, wellbore/well components, etc., can solve the problems of unsatisfactory fracturing effect, poor development benefit, difficulty in forming complex fractures, etc., and achieve improvement Improve the volume and seepage capacity, improve the effect of stimulation, and improve the effect of fracturing stimulation

Active Publication Date: 2020-02-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems in the prior art that it is difficult to form complex fractures, the fracturing effect is not ideal, and the development benefit is poor, the present invention provides a method for increasing the fracturing volume of tight sandstone reservoirs

Method used

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  • Method for increasing fracturing volume in tight sandstone reservoir
  • Method for increasing fracturing volume in tight sandstone reservoir
  • Method for increasing fracturing volume in tight sandstone reservoir

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Experimental program
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Embodiment

[0050] 1. The middle depth of the oil layer in Well X is 1900m, the thickness of the oil layer is 10.8m, the porosity is 9.2%, the core permeability is 0.9mD, the natural fractures in the reservoir are not developed, and the stress difference between the two directions is 7.5MPa. 1 / 2 〃Casing completion, no productivity after perforation.

[0051] 2. Connect liquid flow cavitation device with 2 7 / 8 〃The tubing is connected and lowered into the middle of the perforation section in the wellbore, the 70MPa fracturing wellhead is installed, and the 50m is prepared with a liquid tank 3 Active water, after connecting the ground pipeline, test the pressure to 65MPa.

[0052] 3. After passing the pressure test, use 2.5m 3 / min displacement injects active water from the tubing for 2 hours. This step uses a liquid flow cavitation device. When the injected liquid passes through the cavitation device, a shock wave is generated, and the shock wave is transmitted through the reservo...

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Abstract

The invention discloses a method for increasing the fracturing volume in a tight sandstone reservoir. The method includes the steps that (1) micro-fractures are formed in the tight sandstone reservoir; step (2) the micro-fractures are expanded and communicated; step (3) hydraulic fracturing is performed to form main fractures; and step (4) a proppant is turned from temporary blocking to form branch fractures. The method is suitable for fracturing transformation production increase operation of the tight sandstone reservoir with micro-fractures not developed. Through innovative process ideas, first, a large number of radial micro-fractures are artificially generated in a sandstone reservoir with the micro-fractures not developed and a dense matrix, then the main fractures penetrating through the micro-fractures are formed through hydraulic fracturing, and in the extension process, the main fractures are turned for multiple times, so that a complex fracture system is formed, and the fracturing transformation volume is increased and the production increase effect is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a method for increasing the fracturing volume of a tight sandstone reservoir. It is suitable for fracturing stimulation operations in tight sandstone reservoirs without micro-fractures. Background technique [0002] my country's Ordos Basin, Songliao Basin and Junggar Basin are rich in tight oil resources, and they are the most realistic oil replacement positions in my country. The tight oil resource reservoirs discovered by current exploration generally have the characteristics of tight lithology, lack of micro-fractures, high crude oil viscosity, and low pressure coefficient. It is difficult to form complex fractures with conventional fracturing methods, and the fracturing effect is not ideal. The benefits are poor. [0003] The current main development technology for tight oil resources is: long horizontal well section + multi-stage fracturing, generally usi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 陈作李奎为刘红磊侯磊周林波吴春方李洪春吴峙颖
Owner CHINA PETROLEUM & CHEM CORP
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