CN-121995477-A - Effective fracturing volume prediction method and device based on pressure failure simulation, electronic equipment and medium

CN121995477ACN 121995477 ACN121995477 ACN 121995477ACN-121995477-A

Abstract

The application discloses an effective fracturing volume prediction method and device based on pressure failure simulation, electronic equipment and medium. The method may include establishing a relationship of distance from a maximum fracture front to a fracture point and time, identifying an effective fracture event, establishing a discrete mesh geologic model, and calculating an effective fracture volume based on the discrete mesh geologic model. According to the method, the interference of invalid microseism event points is reduced, the effective fracturing volume with high precision is obtained, and the reliability of fracturing effect evaluation is improved.

Inventors

DING SHENG
LI FEI
ZHANG SHENGHAN

Assignees

中国石油化工股份有限公司
中石化石油物探技术研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. A method of effective fracture volume prediction based on pressure failure simulation, comprising: establishing a relation between the distance from the maximum fracture front edge to the fracturing point and time, and identifying an effective fracturing event; establishing a discrete seam network geological model; Based on the discrete fracture network geologic model, an effective fracture volume is calculated.
2. The method of effective fracture volume prediction based on pressure failure simulation of claim 1, wherein the distance from the maximum fracture front to the fracture point is as follows: Wherein D max is the maximum value of the distance from the fracture front to the fracture point, Q I is the average fracture displacement, and t is the fracture time.
3. The method of effective fracturing volume prediction based on pressure failure simulation of claim 2, wherein identifying an effective fracturing event comprises: the relation between the distance from the large fracture front edge to the fracturing point and the time is approximate to a power function relation, and when the average displacement is determined, an effective event distribution boundary can be obtained; The valid event points are inside the power function curve and the event points outside the power function curve are invalid event points.
4. The method of effective fracturing volume prediction based on pressure failure simulation of claim 1, wherein establishing a discrete mesh geological model comprises: Acquiring three-dimensional coordinates of a boundary of a work area and projection information of all crack surfaces on the top surface and the bottom surface of the work area according to a stratum surface model, and establishing a topological corresponding relation on the top surface and the bottom surface; performing Delaunay triangulation on the top surface of the work area, and mapping the nodes after the triangulation to the bottom surface through affine transformation; Connecting the corresponding nodes of the top surface and the bottom surface to form stand columns, and calculating coordinates of the stand columns penetrating through other ground surfaces between the top surface and the bottom surface; Dividing a model vertical grid layer; And extracting matrix block grids and fracture surface grids, combining the matrix block grids and the fracture surface grids, and establishing a connection relationship between the matrix block grids and the fracture surface grids to form a final grid model, namely a discrete fracture network geological model.
5. The method of effective fracturing volume prediction based on pressure failure simulation of claim 4, wherein calculating an effective fracturing volume based on a discrete mesh geological model comprises: Performing failure development numerical simulation on the fracturing well, and determining full-field pressure distribution when the production of the oil and gas well reaches a quasi-steady state; and determining critical pressure of the transformation area according to the pressure distribution edge, acquiring grids smaller than the critical pressure in the layered discrete fracture model, and accumulating volumes corresponding to the grids to obtain an effective fracturing volume.
6. An effective fracturing volume prediction device based on pressure failure simulation, comprising: the identification module is used for establishing a relation between the distance from the maximum fracture front edge to the fracturing point and time and identifying an effective fracturing event; the modeling module is used for establishing a discrete seam network geological model; and the calculation module is used for calculating the effective fracturing volume based on the discrete fracture network geological model.
7. The effective fracture volume prediction device based on pressure failure simulation of claim 6, wherein the distance from the maximum fracture front to the fracture point is as follows: Wherein D max is the maximum value of the distance from the fracture front to the fracture point, Q I is the average fracture displacement, and t is the fracture time.
8. The effective fracturing volume prediction apparatus based on pressure failure simulation of claim 7, wherein identifying an effective fracturing event comprises: the relation between the distance from the large fracture front edge to the fracturing point and the time is approximate to a power function relation, and when the average displacement is determined, an effective event distribution boundary can be obtained; The valid event points are inside the power function curve and the event points outside the power function curve are invalid event points.
9. An electronic device, the electronic device comprising: A memory storing executable instructions; A processor executing the executable instructions in the memory to implement the effective fracturing volume prediction method based on pressure failure simulation of any of claims 1-5.
10. A computer readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the effective fracturing volume prediction method based on pressure failure simulation of any of claims 1-5.

Description

Effective fracturing volume prediction method and device based on pressure failure simulation, electronic equipment and medium Technical Field The invention relates to the field of microseism data interpretation, in particular to an effective fracturing volume prediction method, device, electronic equipment and medium based on pressure failure simulation. Background The existing microseism fracturing monitoring technology obtains fracture properties (main stress trend, fracture width, density and the like) and sweep volumes (SRV) obtained by calculation of geometric parameters of the fracture according to inversion positioning seismic source information, wherein the sweep volumes are usually volumes defined by furthest microseism event points of stress release response in the fracturing construction process, and errors of several orders of magnitude possibly exist between the sweep volumes and actual effective fracturing volumes. After the fracturing construction, the generated cracks may be closed, so that closed crack volumes are generated, and unconnected crack volumes are formed, and foreign statistics results show that only about 15% of the fracturing cracks are supported by the propping agent, so that a large number of swept volumes belong to unconnected cracks and crack closed volumes, and the volumes do not act on the increase of productivity, so that the precision of microseism fracturing volumes is low, the development policy formulation is seriously influenced, and the calculation results cannot be applied to unconventional development. How to obtain an effective fracturing volume with higher precision by utilizing microseism event points becomes a research focus of microseism interpretation, and in order to solve the problem, it is necessary to develop an effective fracturing volume prediction method, an effective fracturing volume prediction device, electronic equipment and a medium based on pressure failure simulation. The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. Disclosure of Invention The invention provides an effective fracturing volume prediction method, device, electronic equipment and medium based on pressure failure simulation, which can reduce the interference of ineffective microseism event points, obtain effective fracturing volume with higher precision and improve the reliability of fracturing effect evaluation. In a first aspect, embodiments of the present disclosure provide an effective fracturing volume prediction method based on pressure failure simulation, comprising: establishing a relation between the distance from the maximum fracture front edge to the fracturing point and time, and identifying an effective fracturing event; establishing a discrete seam network geological model; Based on the discrete fracture network geologic model, an effective fracture volume is calculated. As a specific implementation manner of the embodiment of the present disclosure, the relationship between the distance from the maximum fracture front edge to the fracturing point and the time is: Wherein D max is the maximum value of the distance from the fracture front to the fracture point, Q I is the average fracture displacement, and t is the fracture time. As a specific implementation of an embodiment of the present disclosure, identifying a valid fracturing event includes: the relation between the distance from the large fracture front edge to the fracturing point and the time is approximate to a power function relation, and when the average displacement is determined, an effective event distribution boundary can be obtained; The valid event points are inside the power function curve and the event points outside the power function curve are invalid event points. As a specific implementation of an embodiment of the present disclosure, establishing a discrete slot network geologic model includes: Acquiring three-dimensional coordinates of a boundary of a work area and projection information of all crack surfaces on the top surface and the bottom surface of the work area according to a stratum surface model, and establishing a topological corresponding relation on the top surface and the bottom surface; performing Delaunay triangulation on the top surface of the work area, and mapping the nodes after the triangulation to the bottom surface through affine transformation; Connecting the corresponding nodes of the top surface and the bottom surface to form stand columns, and calculating coordinates of the stand columns penetrating through other ground surfaces between the top surface and the bottom surface; Dividing a model vertical grid layer; And extracting matrix block grids and fracture surface grids, combining the matrix block grids a