CN-121997512-A - Method, system, storage medium and equipment for evaluating contribution rate of cracks to single well yield

CN121997512ACN 121997512 ACN121997512 ACN 121997512ACN-121997512-A

Abstract

The invention belongs to the technical field of oilfield transformation, and provides a method, a system, a storage medium and equipment for evaluating the contribution rate of a crack to single well yield, wherein the method comprises the steps of determining a geomechanical model of a single well reservoir based on a matrix geomodel; the method comprises the steps of generating a primary fracturing crack expansion model based on a geomechanical model, generating a primary fracturing single well yield relation curve within a first preset time period based on the primary fracturing crack expansion model, determining a single well primary production model, obtaining a repeated fracturing crack expansion model based on the single well primary production model, generating a repeated fracturing single well yield relation curve within a second preset time period based on the repeated fracturing crack expansion model, and quantitatively evaluating single well yield contribution rate according to the primary fracturing single well yield relation curve and the repeated fracturing single well yield relation curve. Quantitative analysis of the yield of the single well after primary fracturing and repeated fracturing is carried out, the yield contribution degree of the single well in different production periods is clear, the evaluation result is accurate, the technology application cost is low, and the popularization is strong.

Inventors

REN JIAWEI
ZHOU TAO
QI YIN
BAI XIAOHU
KANG BO
BU JUN
LI ZHUANHONG
Bai Yuen
YU JINZHU
MAO YAHUI

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A method for evaluating the contribution rate of a crack to the yield of a single well, which is characterized by comprising the following steps: Establishing a matrix geologic model of an oil reservoir where a target single well is located, and determining a geomechanical model of the single well reservoir based on the matrix geologic model; Determining a primary fracturing fracture expansion result based on the geomechanical model, coupling the primary fracturing fracture expansion result to the matrix geological model, and generating a primary fracturing fracture expansion model; Simulating a first preset time length of single well initial production based on the initial fracturing crack extension model, generating an initial fracturing single well yield relation curve within the first preset time length, and determining a single well initial production model; Determining a repeated fracturing crack expansion result based on the single well primary production model, and coupling the repeated fracturing crack expansion result to the single well primary production model to obtain a repeated fracturing crack expansion model; Simulating repeated production of a single well for a second preset time period based on the repeated fracturing crack extension model, and generating a repeated fracturing single well yield relation curve in the second preset time period; and quantitatively evaluating the single well yield contribution rate according to the primary fracturing single well yield relation curve and the repeated fracturing single well yield relation curve.
2. The method of claim 1, wherein establishing a matrix geologic model of a reservoir in which the target individual well is located, determining a geomechanical model of the individual well reservoir based on the matrix geologic model, comprises: Acquiring well point layering data, sedimentary microphase data, multi-well logging data and single-well logging data of a target single well; determining an initial construction model by using the well point layering data, and establishing a phase model by combining the sedimentary microphase data based on the initial construction model; based on the phase model, establishing an attribute model according to the multi-well logging data, and determining the matrix geological model of the oil reservoir where the target single well is located; Based on the matrix geologic model, young's modulus, poisson's ratio, maximum and minimum principal stress and vertical stress data are calculated using the single well logging data, and the geomechanical model of a single well reservoir is established.
3. The method of claim 1, wherein determining the primary fracture propagation results based on the geomechanical model, coupling the primary fracture propagation results to the matrix geomodel, generating the primary fracture propagation model comprises: Based on the geomechanical model, calculating a crack expansion track of the primary fracturing according to the position of the primary fracturing perforation and a pumping program; Based on a crack expansion track of the primary fracturing, dispersing the crack into a plurality of crack segments, generating a natural crack grid, and determining the crack expansion result of the primary fracturing; And coupling the primary fracture expansion result to the matrix geological model to generate the primary fracture expansion model, wherein the primary fracture expansion model comprises the natural fracture grid and the original matrix fracture grid.
4. The method of claim 1, wherein simulating a single well first production run for a first predetermined period of time based on the first fracture propagation model, generating a first fracture single well production relationship curve for the first predetermined period of time, determining a single well first production run model, comprising Setting an phase permeation curve of a target oil reservoir, high-temperature high-pressure PVT data and initial parameters of model operation by adopting a double-hole double-permeation black oil model; Partitioning the primary fracturing crack extension model, partitioning a natural crack grid into a partition I, partitioning an original matrix crack grid into a partition II, simulating primary production of a single well for the first preset time period based on the primary fracturing crack extension model according to the initial parameters, and determining the average primary production yield of the single well; Generating production curves of the partition I and the partition II according to the average single well production of the primary production, acquiring a primary fracturing single well production relation curve within the first preset duration, and determining the single well primary production model.
5. The method of claim 1, wherein determining the repeated frac crack propagation results based on the single well primary production model, coupling the repeated frac crack propagation results to the single well primary production model, obtaining the repeated frac crack propagation model, comprises: calculating crack expansion tracks of repeated fracturing according to the positions of repeated fracturing perforations and a pumping program based on the single well primary production model; Based on a crack expansion track of repeated fracturing, dispersing the crack into a plurality of crack segments, generating a repeated fracturing artificial crack grid, and determining a repeated fracturing crack expansion result; And coupling the repeated fracturing crack expansion result to the single well primary production model to generate a repeated fracturing crack expansion model, wherein the repeated fracturing crack expansion model comprises a natural fracturing crack grid, an original matrix fracturing crack grid and the repeated fracturing artificial fracturing crack grid.
6. The method of claim 1, wherein simulating a single well repeat production run for a second preset time period based on the repeat fracture propagation model, generating a repeat fracture single well production relationship curve for the second preset time period comprises: Partitioning the repeated fracturing crack extension model, dividing the repeated fracturing artificial crack grid into a partition III, dividing the natural crack grid into a partition IV, dividing the original matrix crack grid into a partition V, simulating single-well repeated production for the second preset time period based on the repeated fracturing crack extension model according to initial parameters, and determining the repeated production average single-well yield; and generating production curves of the partition III, the partition IV and the partition V according to the average single well production of the repeated production, and acquiring a repeated fracturing single well production relation curve within the second preset time.
7. The method of claim 1, wherein quantitatively evaluating single well production contribution from the primary and repeated frac single well production profiles comprises: calculating the ratio of the yield of the partition I in the first preset duration to the total yield of the partition I and the partition II in the first preset duration according to the primary fracturing single well yield relation curve; Calculating the ratio of the yield of the partition III in the second preset time period to the total yield of the partition III, the partition IV and the partition V in the second preset time period according to the repeated fracturing single well yield relation curve, and calculating the ratio of the yield of the partition IV in the second preset time period to the total yield of the partition III, the partition IV and the partition V in the second preset time period according to the repeated fracturing single well yield relation curve.
8. The system is characterized by comprising a single well model building module, a single well crack expansion module, a single well yield analysis module and a single well contribution analysis module; The single well model building module is used for building a matrix geologic model of an oil reservoir where a target single well is located, and determining a geomechanical model of a single well reservoir based on the matrix geologic model; The single well crack extension module is used for determining a primary fracture crack extension result based on the geomechanical model, coupling the primary fracture crack extension result to the matrix geological model and generating the primary fracture crack extension model; The single well yield analysis module is used for simulating single well initial production for a first preset time length based on the initial fracturing crack expansion model, generating an initial fracturing single well yield relation curve in the first preset time length, and determining the single well initial production model; And the single well contribution analysis module is used for quantitatively evaluating the single well yield contribution rate according to the primary fracturing single well yield relation curve and the repeated fracturing single well yield relation curve.
9. A computer-readable storage medium storing one or more programs, characterized in that, When the one or more programs are executed, the method of evaluating the contribution rate of a fracture to single well production of any one of claims 1-7 may be implemented.
10. An electronic device comprising a processor, a communication interface, the computer-readable storage medium of claim 9, and a communication bus, wherein the processor, the communication interface, and the computer-readable storage medium communicate with each other over the communication bus; It is characterized in that the method comprises the steps of, The processor is configured to execute a program stored in a computer-readable storage medium.

Description

Method, system, storage medium and equipment for evaluating contribution rate of cracks to single well yield Technical Field The disclosure belongs to the technical field of oilfield transformation, and particularly relates to a method, a system, a storage medium and equipment for evaluating the contribution rate of a crack to single well yield. Background In order to realize repeated development of the old oil well of the oil reservoir, the repeated fracturing modification effect of the old oil well needs to be evaluated, and the fracturing modification parameters of the oil well need to be optimized, so that quantitative analysis needs to be carried out on the yield of the single well after primary fracturing and the yield of the single well after repeated fracturing. In the prior art, the invention patent application with the application number of CN201510764702.1 discloses a quantitative evaluation method of the contribution rate of a crack and a matrix to the single well yield of an ultralow-permeability oil reservoir. The invention patent application with the application number of CN202110392226.0 discloses an intelligent releasable tracer liquid production profile test experimental device and method, which are used for evaluating the contribution degree of each section of crack to the single well yield and cannot evaluate the repeated fracturing modification effect of an old oil well. In summary, at present, the contribution evaluation of the yield of each fracturing segment in a certain time is generally realized by adopting means such as a liquid production profile test, an optical fiber test and the like, and the contribution rate of the repeated fracturing fracture and the primary fracturing fracture after repeated fracturing casting of a single well to the yield of the single well is lack of accurate evaluation. Disclosure of Invention In order to solve the problems, the disclosure provides a method, a system, a storage medium and equipment for evaluating the contribution rate of a crack to single well yield, which are used for establishing a primary fracturing crack expansion model, simulating a primary fracturing single well yield relation curve after single well production is started for a first preset time period, establishing a repeated fracturing crack expansion model, simulating a repeated fracturing single well yield relation curve after single well production is started for a second preset time period again, quantitatively evaluating the contribution rate of the single well yield according to the primary fracturing single well yield relation curve and the repeated fracturing single well yield relation curve, and quantitatively analyzing the yield after single well primary fracturing and the yield after single well repeated fracturing. The invention is realized by the following technical scheme: In a first aspect, embodiments of the present disclosure provide a method for evaluating a single well yield contribution rate of a fracture, the method comprising: Establishing a matrix geologic model of an oil reservoir where a target single well is located, and determining a geomechanical model of the single well reservoir based on the matrix geologic model; Determining a primary fracturing fracture expansion result based on the geomechanical model, coupling the primary fracturing fracture expansion result to the matrix geological model, and generating a primary fracturing fracture expansion model; Simulating a first preset time length of single well initial production based on the initial fracturing crack extension model, generating an initial fracturing single well yield relation curve within the first preset time length, and determining a single well initial production model; Determining a repeated fracturing crack expansion result based on the single well primary production model, and coupling the repeated fracturing crack expansion result to the single well primary production model to obtain a repeated fracturing crack expansion model; Simulating repeated production of a single well for a second preset time period based on the repeated fracturing crack extension model, and generating a repeated fracturing single well yield relation curve in the second preset time period; and quantitatively evaluating the single well yield contribution rate according to the primary fracturing single well yield relation curve and the repeated fracturing single well yield relation curve. Further, the method comprises the steps of, Acquiring well point layering data, sedimentary microphase data, multi-well logging data and single-well logging data of a target single well; determining an initial construction model by using the well point layering data, and establishing a phase model by combining the sedimentary microphase data based on the initial construction model; based on the phase model, establishing an attribute model according to the multi-well logging data, and determining the matrix geological model o