Method for building new slot to implement refracturing

A technology of repeated fracturing and artificial fractures, which is used in earth-moving drilling, wellbore/well components, and production fluids. theoretical research, etc.

Inactive Publication Date: 2007-02-21
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Application Information

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Problems solved by technology

However, the research on in-situ stress diversion is still at the stage of theoretical research and numerical simulation, without th

Method used

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  • Method for building new slot to implement refracturing
  • Method for building new slot to implement refracturing
  • Method for building new slot to implement refracturing

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Embodiment Construction

[0021] Using elliptical fractures to describe the primary fracturing artificial fractures, combined with the tensile failure criterion and shear failure criterion, the conditions for new rock failure in the refracturing process of low-permeability reservoirs were analyzed for the first time at home and abroad, and the repeated fracturing conditions were given. Theoretical criteria for creating new fractures. That is to say, the critical bottomhole extension pressure value required to create new fractures, the in-situ stress field of the target layer and the characteristics and conditions that should be possessed by rock mechanics parameters are given. The new fractures here are divided into shear fractures and tensile fractures, corresponding to the shear failure and tensile failure of rocks, respectively. The orientations of the two fractures are different from those of artificial fractures during initial fracturing, and the critical pressure is a function of the in-situ stre...

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Abstract

The present invention relates to a method for implementing repeated fracturing treatment to make new fracture for low permeability oil field. Said invention utilizes elliptic fracture to described primary fractured artificial fracture, and combines tensional breaking criterion and shear breaking criterion so as to obtain the theoretical basis for repeatedly-fracturing to make new fracture. Said invention utilizes this theoretical basis to provide various fracturing processes for implementing the invented method.

Description

technical field [0001] The present invention relates to hydraulic fracturing stimulation measures for oil and gas reservoirs, and in particular proposes a theoretical method for realizing repeated fracturing in low-permeability oilfields to create new fractures. Maximize the potential of remaining oil and enhance recovery. Background technique [0002] Refracturing is an important way to achieve stable production and increase production in low-permeability oilfields. If refracturing can create new fractures, new oil and gas flow channels can be opened in oil and gas layers, and the undeveloped artificial fractures in the initial fracturing can be communicated on a larger scale. Oil and gas layers, greatly increase oil and gas production, and further improve the development effect of oil and gas reservoirs. However, there is still a lack of systematic and in-depth research on the mechanism of refracturing to create new fractures. At present, the analysis of new fractures cr...

Claims

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Application Information

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IPC IPC(8): E21B43/26
Inventor 宋振云李培超吴增智
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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