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Method for calculating shaft casing variables of horizontal well in hydraulic fracturing of natural fracture shale formation

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

Active Publication Date: 2020-11-24
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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  • Method for calculating shaft casing variables of horizontal well in hydraulic fracturing of natural fracture shale formation
  • Method for calculating shaft casing variables of horizontal well in hydraulic fracturing of natural fracture shale formation
  • Method for calculating shaft casing variables of horizontal well in hydraulic fracturing of natural fracture shale formation

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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 method for calculating shaft casing variables of a horizontal well in hydraulic fracturing of natural fracture shale formation, and belongs to the field of shale gas fracturing technology. The invention mainly overcomes the shortcomings of existing technology and puts forward the method for calculating the shaft casing variables of the horizontal well in hydraulic fracturing of natural fracture shale formation. The method includes the following steps that crustal stress, rock mechanics parameters, natural fracture geometrical parameters and logging data of a target work area are obtained; an I-II composite type fracture displacement field analytical model of superimposed fluid pressure is established based on a complex variable function method; the tangential relative displacement of a fracture is obtained through calculation; and the shaft casing variables are determined according to the tangential relative displacement of the fracture. According to the method, the shaft casing variables can be obtained through precise calculation, and in the areas where the risk of casing deformation is high, measures such as shaft orientation optimizing, well cementation quality strengthening, appropriate displacement reduction and temporary plugging technology adoption can be taken into consideration to reasonably control the fluid pressure in the fracture and reduce the risk of casing deformation.

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 Applications(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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