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Calculation method for stratum initial cracking pressure of deep shale

A calculation method and technology of fracture initiation pressure, applied in the field of exploration, can solve problems such as high formation fracture pressure, exceeding the bearing capacity of pipe strings and equipment, failure of fracturing stimulation measures, etc.

Inactive Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0003] In the process of reservoir stimulation, the fracture pressure of some formations is abnormally high, exceeding the bearing capacity of the pipe string and equipment, which directly leads to the failure of fracturing stimulation measures

Method used

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  • Calculation method for stratum initial cracking pressure of deep shale
  • Calculation method for stratum initial cracking pressure of deep shale
  • Calculation method for stratum initial cracking pressure of deep shale

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Embodiment Construction

[0029] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0030] Embodiments of the present invention provide a method for calculating formation crack initiation pressure of deep shale, such as figure 1 shown, including:

[0031] Step S101, acquiring casing, cement sheath and wellbore dimensions, combining with perforation parameters, constructing a formation-wellbore-perforation three-dimensional model.

[0032] Firstly, a finite element model is established, bas...

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Abstract

The invention discloses a calculation method for the stratum initial cracking pressure of deep shale, and belongs to the technical field of exploration. The calculation method for the stratum initial cracking pressure of the deep shale is used for calculating the stratum initial cracking pressure of the deep shale and comprises the steps that the size of a casing pipe, the size of a cement loop and the size of a borehole are acquired, and a stratum-shaft-perforation three-dimensional model is constructed by combining perforation parameters; material attributes are given to the stratum-shaft-perforation three-dimensional model on the basis of material parameters of the casing pipe and the cement loop and stratum rock mechanical parameters, wherein the stratum rock mechanical parameters have the transverse isotropic homogeneity characteristic and the nonlinear deformation characteristic; boundary loads are applied to the stratum-shaft-perforation three-dimensional model, and the stratum initial cracking pressure is obtained.

Description

technical field [0001] The invention relates to the technical field of exploration, in particular to a calculation method for formation crack initiation pressure of deep shale. Background technique [0002] Deep shale oil and gas reservoirs are characterized by low reserve abundance, poor physical properties, low natural productivity, high production cost, and difficulty in increasing production, and most of them are difficult-to-produce reservoirs. Hydraulic fracturing technology has been widely used in the exploitation of oil and gas in low-permeability formations. Spiral perforation is a common measure in this technology. The formation fracture pressure under this condition is one of the important factors affecting the success rate and effect of construction. . [0003] In the process of reservoir stimulation, the fracture pressure of some formations is abnormally high, which exceeds the bearing capacity of the pipe string and equipment, which directly leads to the failu...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B47/06
Inventor 张旭东金衍单清林侯冰李奎为徐胜强
Owner CHINA PETROLEUM & CHEM CORP
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