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Calculation method of wellbore casing variables for hydraulically fractured horizontal wells in naturally fractured shale formations

A technology of natural fractures and hydraulic fracturing, which is applied in the field of shale gas fracturing to achieve the effects of reducing displacement, reducing the risk of casing deformation, and enhancing the quality of cementing

Active Publication Date: 2021-02-19
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

At present, the set of variables is usually calculated based on caliper logging analysis or numerical simulation, and there are many limitations in practical applications

Method used

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  • Calculation method of wellbore casing variables for hydraulically fractured horizontal wells in naturally fractured shale formations
  • Calculation method of wellbore casing variables for hydraulically fractured horizontal wells in naturally fractured shale formations
  • Calculation method of wellbore casing variables for hydraulically fractured horizontal wells in naturally fractured shale formations

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0025] During the fracturing process of Well HX-1, a horizontal well in the well area, the 20th section of bridge plug and perforation was blocked due to casing deformation. The ant tracking fracture prediction map shows that there may be natural fractures near the resistance point (fracture length 150m, N50°E), and the wellbore is about 30m away from the center of the fracture length. Well logging shows that there is an obvious temperature drop at the resistance point. The in-situ stress in the well area is relatively stable, and the maximum principal stress direction is predicted to be 103°.

[0026] Therefore adopt the method of the present invention to calculate the well casing variable of HX-1, concrete steps are as follows:

[0027] Step S10, obtaining the in-situ stress, rock mechanical parameters, natural fracture geometric parameters, and...

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Abstract

The invention relates to a calculation method for wellbore casing variables of hydraulic fracturing horizontal wells in shale formations with natural fractures, and belongs to the technical field of shale gas fracturing. The present invention mainly overcomes the deficiencies in the prior art, and proposes a calculation method for the wellbore casing variable of the hydraulic fracturing horizontal well in the natural fracture shale formation, including the following steps: obtaining the ground stress, rock mechanics parameters, and natural fracture geometry of the target work area Parameters and well logging data; based on the complex variable function method, an analytical model of I-II composite fracture displacement field with superimposed fluid pressure is established; the tangential relative displacement of the fracture is calculated; finally, the wellbore casing variable is determined according to the tangential relative displacement of the fracture . The present invention can accurately calculate the wellbore casing variable, and in areas where the risk of casing change is judged to be high, measures such as optimizing the wellbore azimuth, strengthening the cementing quality, appropriately reducing displacement, and adopting temporary plugging technology to reasonably control the reduction of the fluid pressure in the fracture can be considered. Change risk.

Description

technical field [0001] The invention relates to a calculation method for wellbore casing variables of hydraulic fracturing horizontal wells in shale formations with natural fractures, and belongs to the technical field of shale gas fracturing. Background technique [0002] During the shale gas fracturing process, the casing will be deformed to varying degrees, which will increase the difficulty and cost of fracturing construction, bring great difficulties to subsequent operations and production, and cause problems such as low single well production and short well life cycle, which are serious Affect the overall economic benefits of shale gas development. Casing deformation (hereinafter referred to as casing deformation) will affect the integrity of the wellbore, hinder the downhole tool deployment, reduce the effectiveness of fracturing stages, and even cause some fracturing stages to abandon stimulation. One of the important factors in the development of shale gas fracturin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00G06F30/20
Inventor 路千里郭建春刘壮张航母青平尹从彬李彦超
Owner SOUTHWEST PETROLEUM UNIV
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