CN-121982350-A - Behavior characteristic determining method, device, equipment and medium of profile control system

CN121982350ACN 121982350 ACN121982350 ACN 121982350ACN-121982350-A

Abstract

The embodiment of the invention discloses a behavior characteristic determining method, device, equipment and medium of a profile control system. The method comprises the steps of obtaining a state image corresponding to a pore simulation model of an oil-gas field in each displacement stage, wherein the displacement stage at least comprises a saturated oil stage, a blank water flooding stage, a profile control system displacement stage and a subsequent water flooding stage, carrying out element separation on each state image to obtain a single element image corresponding to each state image, carrying out image comparison of the same type among different stages on the single element images corresponding to each displacement stage, and determining the behavior characteristics of the profile control system in the pore simulation model. By the technical scheme provided by the embodiment of the invention, the behavior characteristics of the profile control system in the pore structure of the reservoir can be effectively identified, tracked and reconstructed, the efficiency, accuracy and universality of the determination of the behavior characteristics are improved, and an effective decision basis is provided for the follow-up establishment of an accurate profile control scheme aiming at specific oil reservoir conditions.

Inventors

GAO MING
ZHANG XINGGUANG
WANG ZHONGSHENG
ZHOU CHAOHUI
ZOU XINYUAN
ZHANG QUN
ZHANG FAN
FAN JIAN
ZHOU TIYAO
PAN RUOSHENG
QI JING

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260202

Claims (10)

1. The behavior characteristic determining method of the profile control system is characterized by comprising the following steps of: the method comprises the steps of acquiring a state image corresponding to a pore simulation model of an oil-gas field in each displacement stage, wherein the displacement stage at least comprises a saturated oil stage, a blank water displacement stage, a displacement system displacement stage and a subsequent water displacement stage; Element separation is carried out on each state image to obtain a single element image corresponding to each state image, wherein the single element image at least comprises a skeleton image and an oil distribution image; and comparing the unit pixel images corresponding to each displacement stage with the same type images among different stages, and determining the behavior characteristics of the profile control system in the pore simulation model.
2. The method of claim 1, wherein the element separating each state image to obtain a unit pixel image corresponding to each state image comprises: Performing binarization processing on each state image to obtain a first gray level image; separating the solid element and the fluid element in the first gray level image based on gray value difference between the solid element and the fluid element, and determining a skeleton image and an oil-water mixed image corresponding to each state image; performing binarization processing on the oil-water mixed image to obtain a second gray level image; And separating the oil and the water in the second gray level image based on the gray level value difference between the oil and the water, and determining an oil distribution image corresponding to each state image.
3. The method of claim 1, wherein the performing different inter-stage image comparison of the unit pixel images corresponding to each displacement stage to determine the behavior characteristics of the profile control system in the pore simulation model comprises: Performing pore-throat feature recognition and pore-throat feature analysis on the skeleton image to obtain pore-throat feature parameters corresponding to the skeleton image; and comparing the same type data among different stages of oil distribution images and/or pore throat characteristic parameters corresponding to each displacement stage, and determining the behavior characteristics of a profile control system in the pore simulation model.
4. The method of claim 3, wherein performing pore-throat feature recognition and pore-throat feature analysis on the skeleton image to obtain pore-throat feature parameters corresponding to the skeleton image comprises: performing structure segmentation on the skeleton image, determining a pore structure and a throat structure in the skeleton image, and marking the positions of the structures; Performing pore characteristic recognition and pore characteristic analysis on the pore structure to obtain pore characteristic parameters corresponding to the skeleton image; Performing throat characteristic identification and throat characteristic analysis on the throat structure to obtain throat characteristic parameters corresponding to the skeleton image; and determining pore-throat characteristic parameters corresponding to the skeleton image based on the pore characteristic parameters and the throat characteristic parameters.
5. A method according to claim 3, wherein the determining the behavior characteristics of the profile control system in the pore simulation model by comparing the same type of data between different phases for the oil distribution image and/or pore throat characteristic parameter corresponding to each displacement phase comprises: Image comparison between different stages is carried out on oil distribution images corresponding to each displacement stage, the flow path of the oil displacement agent of the profile control system in the pore simulation model is determined, and/or, Performing difference processing on the pore-throat characteristic parameters of the same position or region corresponding to each displacement stage, and determining characteristic parameter variation among different stages; And determining a profile control agent flow path of the profile control system in the pore simulation model based on the spatial distribution of the characteristic parameter variation and a preset statistical analysis mode.
6. The method of claim 1, wherein each of the displacement phases corresponds to at least two status images, the method further comprising: for each displacement stage, performing image change analysis on at least two state images corresponding to the current displacement stage based on an image acquisition time sequence, and determining skeleton change information and oil distribution change information corresponding to the current displacement stage; Performing back-pushing based on the framework change information, and determining a profile control agent flow path of a profile control system in the current displacement stage; And performing back-pushing based on the oil distribution change information, and determining an oil displacement agent flow path of the profile control and displacement system in the current displacement stage.
7. A behavior characteristic determining device of a profile control system, the device comprising: The system comprises a state image acquisition module, a displacement phase acquisition module and a displacement phase acquisition module, wherein the state image acquisition module is used for acquiring a state image corresponding to a pore simulation model of an oil-gas field in each displacement phase, and the displacement phase at least comprises a saturated oil phase, a blank water displacement phase, a displacement phase of a profile control system and a subsequent water displacement phase; The single element image determining module is used for carrying out element separation on each state image to obtain a single element image corresponding to each state image, wherein the single element image at least comprises a skeleton image and an oil distribution image; and the behavior characteristic determining module is used for comparing the unit pixel images corresponding to each displacement stage with the images of the same type in different stages and determining the behavior characteristics of the profile control system in the pore simulation model.
8. An electronic device, the electronic device comprising: One or more processors; A memory for storing one or more programs; When executed by the one or more processors, causes the one or more processors to implement the behavior feature determination method of a profile as claimed in any one of claims 1-6.
9. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements a method of determining behavioral characteristics of a profile according to any one of claims 1-6.
10. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements a behavior feature determination method of a profile control system according to any one of claims 1-6.

Description

Behavior characteristic determining method, device, equipment and medium of profile control system Technical Field The embodiment of the invention relates to the technical field of simulation, in particular to a behavior characteristic determining method, device, equipment and medium of a profile control system. Background Along with the continuous high-speed development of social economy, the demands of China on energy are increasingly urgent. The crude oil is used as one of energy sources, and the method has important significance for ensuring the stable yield and the yield increase of the crude oil. At present, most of the dominant force oil fields enter the later development stage of high water content and even extra-high water content, and an ineffective circulation of injected water occurs, so that a large amount of residual oil is trapped in a low-permeability area and cannot be effectively used, and the displacement efficiency is reduced. Aiming at the development contradiction, a profile control system with specific functions is generally injected into the deep part of the stratum. On one hand, the high-permeability layer and the high-permeability strip are effectively plugged, the permeability of the high-permeability layer and the high-permeability strip is reduced, injected water is forced to change the flow direction and enter the low-permeability layer and the low-permeability strip which are difficult to reach originally, on the other hand, in the displacement process, the profile control agent can have complex physical and chemical actions with crude oil, the oil-water interfacial tension is reduced, the oil washing efficiency is improved, and the synergistic advantage of blending and driving is fully exerted. However, in order to design and optimize a precise profile control scheme for specific reservoir conditions, a way is needed to be able to effectively identify, track and reconstruct the actual flow path of the profile control agent in the reservoir pore structure. Disclosure of Invention The embodiment of the invention provides a behavior characteristic determining method, device, equipment and medium of a profile control system, which can effectively identify, track and reconstruct the behavior characteristic of the profile control system in a pore structure of a reservoir, improve the efficiency, accuracy and universality of behavior characteristic determination and provide effective decision basis for the follow-up establishment of an accurate profile control scheme aiming at specific oil reservoir conditions. In a first aspect, an embodiment of the present invention provides a method for determining a behavioral characteristic of a profile control system, including: the method comprises the steps of acquiring a state image corresponding to a pore simulation model of an oil-gas field in each displacement stage, wherein the displacement stage at least comprises a saturated oil stage, a blank water displacement stage, a displacement system displacement stage and a subsequent water displacement stage; Element separation is carried out on each state image to obtain a single element image corresponding to each state image, wherein the single element image at least comprises a skeleton image and an oil distribution image; and comparing the unit pixel images corresponding to each displacement stage with the same type images among different stages, and determining the behavior characteristics of the profile control system in the pore simulation model. The method comprises the steps of obtaining a first gray level image through binarization processing of each state image, separating solid elements and fluid elements in the first gray level image based on gray level value differences between the solid elements and the fluid elements, determining a skeleton image and an oil-water mixed image corresponding to each state image, obtaining a second gray level image through binarization processing of the oil-water mixed image, separating oil and water in the second gray level image based on gray level value differences between the oil and the water, and determining an oil distribution image corresponding to each state image. Optionally, the method further comprises the steps of carrying out pore-throat feature recognition and pore-throat feature analysis on the skeleton image to obtain pore-throat feature parameters corresponding to the skeleton image, and carrying out data comparison of the same type among different stages on oil distribution images and/or pore-throat feature parameters corresponding to each displacement stage to determine the behavior features of a profile control system in the pore simulation model. Optionally, the method further comprises the steps of carrying out structure segmentation on the skeleton image, determining a pore structure and a throat structure in the skeleton image, marking each structure position, carrying out pore feature recognition and pore feature analysi