CN-122014178-A - Carbon dioxide flooding and underground sealing cooperative control method and system

CN122014178ACN 122014178 ACN122014178 ACN 122014178ACN-122014178-A

Abstract

The invention provides a carbon dioxide flooding and underground sealing cooperative control method and system, and belongs to the technical field of carbon dioxide flooding and underground sealing. The method comprises the steps of collecting reservoir basic data and initial state data of a reservoir geological model, performing standardized processing to obtain reservoir data, designing a self-adaptive well pattern layout, constructing a multi-field coupling early warning system, combining a bidirectional linkage mechanism of injection and production optimization driving early warning adjustment and risk early warning driving well pattern regulation, constructing a continuous sealing barrier for a target reservoir area by utilizing a directional isolation technology, and monitoring the long-acting sealing barrier by utilizing the multi-field coupling early warning system to form a preset sealing and storage guarantee system. According to the invention, the sealing stability of the sealing area is improved without re-drilling in the sealing stage, the risk disposal response time is shortened, the accurate positioning of the risk points is realized, the oil displacement efficiency attenuation rate is reduced, the recovery ratio is improved, the sealing risk pre-judging accuracy is improved, and the resource utilization rate is improved.

Inventors

CAI JIATIE
LI HUIMIN
XU XING
PAN YI
HU JIANWEI
Chang Zhaoyuan
WANG RUOTONG
MA HUIYANG

Assignees

辽宁石油化工大学

Dates

Publication Date: 20260512
Application Date: 20251209

Claims (10)

1. The carbon dioxide flooding and underground sealing cooperative control method is characterized by comprising the following steps of: acquiring oil reservoir basic data of an oil reservoir geological model through a geological exploration technology, acquiring initial state data according to sensors deployed in a target oil reservoir area, and performing standardization processing to obtain oil reservoir data; Based on oil reservoir data, a self-adaptive well pattern layout is designed, and a multi-field coupling early warning system is constructed, so that the well pattern function and early warning monitoring are matched with each other; The method comprises the steps of utilizing a self-adaptive well pattern layout and a multi-field coupling early warning system to combine a two-way linkage mechanism for injection and production optimization driving early warning adjustment and risk early warning driving well pattern regulation and control, and realizing depth coordination of self-adaptive well pattern dynamic function switching and monitoring by the multi-field coupling early warning system; After the oil displacement effect of the target oil reservoir area is determined to reach the standard, a continuous sealing barrier is constructed for the target oil reservoir area by utilizing a directional isolation technology; and monitoring the long-acting sealing barrier by using a multi-field coupling early warning system to form a preset sealing guarantee system, so as to realize stable sealing of carbon dioxide.
2. The cooperative control method of claim 1, wherein the designing an adaptive well pattern layout comprises: classifying well types according to the oil reservoir characteristics and development requirements in the oil reservoir data; designing a spatial layout based on the remaining oil distribution data in the reservoir data; Presetting key parameters according to potential channeling channels in the oil reservoir data; And verifying well pattern effects under different injection and mining scenes by utilizing oil reservoir numerical simulation software, and generating a self-adaptive well pattern layout by combining well pattern classification, space layout and key parameters.
3. The cooperative control method according to claim 2, wherein the constructing the multi-field coupling early warning system includes: planning an inter-well-in-well three-dimensional monitoring framework according to the self-adaptive well pattern layout; deploying distributed optical fibers among wells, and installing corresponding sensors at preset positions in the wells; Based on the data of the distributed optical fiber and the sensor, a multi-stage data transmission link is constructed, and a monitoring data-well pattern position association mapping is established to generate a multi-field coupling early warning system.
4. The cooperative control method according to claim 1, wherein the injection and production optimization driving early warning adjustment includes: Based on the data collected by the distributed optical fibers, monitoring the oil displacement effect by combining with a preset judgment standard; when the oil displacement effect reaches a preset judging standard, the cooperative control system generates and executes a well function switching instruction; After the well function switching instruction is executed, the acquisition frequency of the sensor is increased, the diffusion trend of carbon dioxide is monitored, and the early warning parameters of the multi-field coupling early warning system are dynamically optimized.
5. The cooperative control method of claim 4, wherein the risk early warning driving well pattern regulation comprises: Analyzing data of the distributed optical fiber and the sensor, judging that the flow-channeling risk exists when abnormal pressure change and synchronous abnormal rise of carbon dioxide concentration are detected, and triggering grading early warning; Generating and executing well pattern emergency regulation and control instructions through a cooperative control system according to triggered hierarchical early warning, and pushing early warning information for a user to confirm; After the user confirms the early warning information, temporary plugging reinforcement is carried out on the preset isolation belt.
6. The cooperative control method of claim 1, wherein the constructing a continuous sealing barrier for the target reservoir region using directional isolation techniques comprises: Combining oil reservoir data, injection and production optimization data and carbon dioxide distribution monitoring results, and defining the boundary of an oil displacement area-a sealing area by a numerical simulation method; Injecting curable gel into the isolation belt through a preset well for plugging according to the defined boundary to form a continuous sealing barrier; And detecting the integrity of the continuous sealing barrier by using a preset sealing test technology, and if a leakage point is detected, injecting curable gel until reaching the standard.
7. The cooperative control method according to claim 6, wherein the monitoring the long-acting sealing barrier by using the multi-field coupling early warning system to form a preset sealing and preserving guarantee system includes: Utilizing a multi-field coupling early warning system to collect multi-source data of the sealing area according to a preset frequency; Carrying out inspection on the sealing monitoring well, the isolation belt and the early warning equipment according to a preset period; And summarizing the monitoring data according to a preset time period, predicting the long-term carbon dioxide sequestration stability through numerical simulation, and generating a sequestration monitoring report.
8. The cooperative control method according to claim 1, characterized in that the cooperative control method further comprises: And integrating the data stream and the instruction stream of the cooperative control system by utilizing the SCADA control system, performing instruction closed-loop execution by using a special linkage module, and iteratively optimizing parameters of the cooperative control system according to the operation data of the SCADA control system.
9. The cooperative control method according to claim 1, wherein the integrating the data stream and the command stream of the cooperative control system by the SCADA control system performs the closed-loop execution of the command by a dedicated linkage module, and includes: the SCADA control system is deployed, the data stream and the instruction stream of each link of the cooperative control system are integrated, and closed-loop management of data-instruction-execution-feedback is realized; Developing a special early warning-regulation linkage module, and converting monitoring data of the multi-field coupling early warning system into well pattern regulation executable instructions; Setting hierarchical operation authority, configuring data encryption and log recording functions, and ensuring traceability and data safety and controllability of the SCADA control system.
10. A co-control system for carbon dioxide flooding and underground sequestration, characterized in that it comprises a control module comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the computer program to implement the co-control method according to any one of claims 1-9.

Description

Carbon dioxide flooding and underground sealing cooperative control method and system Technical Field The invention relates to the technical field of carbon dioxide flooding and underground sealing, in particular to a carbon dioxide flooding and underground sealing cooperative control method and system. Background The carbon dioxide oil displacement and underground sealing are technologies with dual values of resource development and carbon emission reduction, and the core is that captured carbon dioxide is injected into an underground oil reservoir to realize the synergy of oil displacement synergy and permanent sealing. After the carbon dioxide is injected into the oil reservoir, the residual oil which is difficult to be mined originally is pushed to flow to the oil extraction well by the functions of reducing the viscosity of crude oil, improving the oil-water fluidity ratio, dissolving crude oil and the like, and after the oil displacement, the carbon dioxide which is not mined can be fixed by the functions of geological entrapment, rock pore adsorption, stratum water dissolution, mineral carbonization and the like of the oil reservoir, and is stored underground for a long time, so that the greenhouse effect caused by entering the atmosphere is avoided. In the prior art, when carbon dioxide oil displacement and underground sealing are carried out, the well pattern in the oil displacement stage is only used for oil extraction efficiency, an isolation well or a monitoring well is required to be redeployed in the sealing stage, so that the construction period is prolonged, the cost is increased, the sealing barrier and the original well pattern are poor in suitability, only passive alarm can be realized on risks such as carbon dioxide channeling, sealing leakage and the like, a closed loop is lacked in early warning-disposal, the risk response is lagged, the loss of oil displacement efficiency or the environmental risk is easily caused, the suitability of the whole life cycle for dynamic change of an oil reservoir is lacked, and the injection and production parameters, the early warning threshold and the sealing strategy are fixed and cannot be dynamically optimized along with the distribution of residual oil in the oil reservoir and the change of stratum stress, so that the later oil displacement efficiency is attenuated or the sealing stability is reduced. Disclosure of Invention The invention aims to provide a carbon dioxide flooding and underground sealing and storing cooperative control method and system, which are used for solving the technical problems that in the prior art, an isolation well needs to be redeployed in the sealing and storing stage, the suitability of the isolation well and the original well pattern is poor, the flooding efficiency is lost easily due to risk response lag, and the full life cycle suitability for dynamic change of an oil reservoir is lacking. The invention provides a carbon dioxide flooding and underground sealing cooperative control method, which comprises the steps of collecting reservoir basic data of a reservoir geological model through a geological exploration technology, collecting initial state data according to sensors deployed in a target reservoir area, performing standardization processing to obtain reservoir data, designing a self-adaptive well pattern layout based on the reservoir data, constructing a multi-field coupling early warning system to enable well pattern functions and early warning monitoring to be matched with each other, utilizing the self-adaptive well pattern layout and the multi-field coupling early warning system, combining a bidirectional linkage mechanism of injection and production optimization driving early warning adjustment and risk early warning driving well pattern regulation to achieve depth cooperation of oil displacement effect of the target reservoir area after reaching standards, utilizing a directional isolation technology to construct a continuous sealing barrier for the target reservoir area, utilizing the multi-field coupling early warning system to monitor the long-acting sealing barrier to form a preset sealing guarantee system, and achieving stable sealing of carbon dioxide. The method comprises the steps of selecting oil reservoir characteristics and development requirements in oil reservoir data, classifying well patterns, designing spatial layout based on residual oil distribution data in the oil reservoir data, presetting key parameters according to potential channeling channels in the oil reservoir data, verifying well pattern effects under different injection and mining scenes by utilizing oil reservoir numerical simulation software, and generating the self-adaptive well pattern layout by combining the well pattern classification, the spatial layout and the key parameters. The method comprises the steps of constructing a multi-field coupling early warning system, namely planning an inter-well-in-well three-dimensi