A simulation method of single fracture propagation based on quasi-continuous geomechanical model

A technology of geomechanics and simulation methods, applied in the field of hydraulic fracturing simulation, can solve problems such as poor integration path, low solution rate, large amount of calculation, etc., and achieve dynamic display of fractures, fast solution speed, and good reliability. Effect

Active Publication Date: 2019-01-18
PEKING UNIV
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Problems solved by technology

The disadvantage of this method is that this method is limited to solving two-dimensional problems. When it is extended to three-dimensional, there is no good solution for how to choose the integration path of J integral.
The disadvantage of this method is that it is difficult to control the selection of particle size and the acquisition of mechanical parameters between particles, and the calculation amount is large.
However, when applied to fracture propagation simulation, the disadvantages of this method are that 1) the direction of fracture propagation cannot be determined, 2) it is not suitable for hard shale, and 3) it can only set fuzzy s

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  • A simulation method of single fracture propagation based on quasi-continuous geomechanical model
  • A simulation method of single fracture propagation based on quasi-continuous geomechanical model
  • A simulation method of single fracture propagation based on quasi-continuous geomechanical model

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Embodiment 1

[0078] Assume that there is a construction area, the well number of which is "well-1", and the fracturing operation simulation of this well is planned. All the parameters required to import it are as follows:

[0079] 1) Three-dimensional geological model information: the model is a three-dimensional cube of 300m×30m×10m, the formation is isotropic, and the permeability in all directions is 1.02×10 -13 m 2 , the porosity is 10%, and the fractured well is located at the center of the model;

[0080] 2) Petrophysical parameter information: rock elastic modulus is 41.4GPa, Poisson's ratio is 0.2, density is 2.3×10 3 Kg / m 3 , the tensile strength is 0.2MPa, the cohesion is 2MPa, and the internal friction angle is 0.52;

[0081] 3) Fracture parameter information: the friction coefficient of the fracture surface is 15, the compressive strength of the fracture surface is 80MPa, and the tangential stiffness of the fracture surface is 2MPa / mm;

[0082] 4) Fracturing construction p...

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Abstract

The invention discloses a simulation method of single propagation expansion based on a quasi-continuous geomechanical model, which comprises the following steps: acquiring geological parameters, including three-dimensional geological information and rock physical property information; Correcting petrophysical information; Establishing three-dimensional geological model of stratum; establishing FEMfluid-solid coupling model; obtaining the pressure field, displacement field, stress field and strain field of the three-dimensional geological model by solving the fluid-solid coupling equations ofthe finite element method; judging whether cracks are produced or not according to the stress strength criterion; obtaining The fracture width, permeability matrix and flexibility matrix, and then calculating the influence of fracture on pressure field and displacement field. The simulation of single fracture propagation based on quasi-continuous geomechanical model is realized. The invention hasthe advantages of quick solution, high accuracy and good reliability, and effectively solves the problem of dynamic display of fractures in the process of hydraulic fracturing simulation.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing simulation, and in particular relates to a single fracture expansion simulation method based on a quasi-continuous geomechanics model. Background technique [0002] Reservoir stimulation is an effective method to increase production in the development of low permeability oil and gas reservoirs. Reservoir stimulation simulation technology can predict the size, shape, scale and even complexity of artificial fractures in reservoirs by simulating fracture propagation, which has guiding significance for on-site fracturing implementation and is a necessary technology for realizing economic benefits of oilfields. [0003] Reservoir stimulation models include 2D, pseudo-3D (P3D) and full 3D (PL3D) models. The earliest two-dimensional model is also called analytical model, which includes KGD model [1], PKN model [2] and radial model [3]. The KGD model assumes that the fracture height remains...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/05
CPCG06T17/05G06F30/20
Inventor 李三百张东晓
Owner PEKING UNIV
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