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A method for increasing fracturing volume in tight sandstone reservoirs

A technology for tight sandstone and tight sandstone reservoirs, which is applied in the direction of exploitation fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as unsatisfactory fracturing effect, difficulty in forming complex fractures, poor development efficiency, etc., and achieve improvement Fracturing stimulation effect, stimulation volume increase, effect of stimulation volume increase

Active Publication Date: 2021-08-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • A method for increasing fracturing volume in tight sandstone reservoirs
  • A method for increasing fracturing volume in tight sandstone reservoirs
  • A method for increasing fracturing volume in tight sandstone reservoirs

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Experimental program
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Effect test

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 of a tight sandstone reservoir. Including: step (1) forming micro-fractures in tight sandstone reservoirs; step (2) expanding and connecting micro-fractures; step (3) forming main fractures through hydraulic fracturing; step (4) turning proppant from temporary plugging to form branch fractures . The invention is suitable for fracturing and stimulation operations of tight sandstone reservoirs without micro-fractures. The present invention adopts an innovative process idea, first artificially generates a large number of radial micro-cracks in sandstone reservoirs with no micro-cracks and dense matrix, and then forms main cracks passing through the micro-cracks through hydraulic fracturing, and makes the main cracks During the extension process, it turns multiple times to form a complex fracture system, which improves the volume of fracturing stimulation and the effect of stimulation.

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 Patents(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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