A supercritical CO2 integrated development device for low-maturity shale oil

Abstract

The present invention provides a supercritical CO2 integrated development system for low- to medium-maturity shale oil. This system comprises a supercritical CO2 generation system, including a compressor, a heater, a temperature sensor, and a pressure sensor. The compressor is used to pressurize the CO2 gas to a supercritical state, the heater is used to heat the pressurized CO2 gas to a supercritical temperature, and the temperature sensor and pressure sensor are used to monitor and adjust the temperature and pressure of the CO2 in real time to ensure it remains in a supercritical state. This system utilizes a dual-medium model and a fluid dynamics simulation module to accurately describe the matrix and fracture characteristics of the shale layer, optimize the contact efficiency between CO2 and shale oil, and improve dissolution and extraction. Real-time monitoring and adjustment software automatically adjusts injection and production parameters based on real-time data and issues alarms in abnormal situations, ensuring the stability and safety of system operation.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated development equipment for medium- and low-maturity shale oil, and specifically to a supercritical CO2 integrated development equipment for medium- and low-maturity shale oil. Background Art

[0002] The basic structure of a supercritical CO2 integrated development unit for low-maturity shale oil includes the following main parts: Supercritical CO2 generation system: This system heats and pressurizes CO2 gas to a supercritical state through a compressor and a heater. Injection system: Supercritical CO2 is injected into the shale layer through pipelines and injection wells. Dissolution and extraction system: In the shale layer, supercritical CO2 acts as a solvent, contacts the shale oil and dissolves the hydrocarbon substances therein to form a dissolved hydrocarbon fluid. Production system: The dissolved hydrocarbon fluid is extracted to the surface through production wells. Separation and recovery system: On the surface, supercritical CO2 and shale oil are separated by a separator, the CO2 is recovered and reused, and the shale oil enters storage or further processing.

[0003] This system has the following defects: the geological characteristics of the shale layer are complex and highly heterogeneous, which may lead to insufficient contact between CO2 and shale oil, affecting the dissolution and extraction efficiency. The high pressure and high temperature environment of supercritical CO2 places high demands on equipment materials and structures, the equipment is complex, and maintenance and servicing are difficult. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a supercritical CO2 integrated development device for medium and low-maturity shale oil, which solves the problem that the geological characteristics of the shale layer are complex and the heterogeneity is large, which may lead to insufficient contact between CO2 and shale oil, affecting the dissolution and extraction efficiency; the high pressure and high temperature environment of supercritical CO2 has high requirements on equipment materials and structures, the equipment is complex, and maintenance is difficult.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a supercritical CO2 integrated development device for low-maturity shale oil, comprising:

[0008] A supercritical CO2 generation system includes a compressor, a heater, a temperature sensor, and a pressure sensor. The compressor is used to pressurize the CO2 gas to a supercritical state. The heater is used to heat the pressurized CO2 gas to a supercritical temperature. The temperature sensor and pressure sensor are used to monitor and adjust the temperature and pressure of the CO2 in real time to ensure that it remains in a supercritical state.

[0009] The injection system includes multiple injection wells, injection pipelines, and a distribution control module. Supercritical CO2 is transported to the injection wells through the injection pipelines. The distribution control module controls the distribution of CO2 in multiple injection wells to ensure uniform distribution of supercritical CO2 in the shale layer.

[0010] A dissolution and extraction system, including a fracture network and dual-medium model. In shale formations, supercritical CO2 contacts shale oil through the fracture network and dissolves the hydrocarbons therein. The dual-medium model is used to describe the matrix and fracture characteristics of the shale formation and optimize the contact efficiency between CO2 and shale oil.

[0011] A production system comprising a plurality of production wells, production pipelines and a distribution control module, wherein dissolved hydrocarbon fluid is transported to the surface through the production pipelines, and the distribution control module controls fluid extraction from the plurality of production wells to improve the recovery rate of the dissolved hydrocarbon fluid;

[0012] The separation and recovery system includes a multi-stage separator, a cooling module, and a recovery pipeline. The multi-stage separator is used to separate supercritical CO2 and shale oil. The cooling module is used to cool and condense the recovered CO2. The recovery pipeline transports the cooled CO2 to the supercritical CO2 generation system for reuse.

[0013] Geological property analysis software, including a 3D geological modeling module for constructing a 3D geological model of the shale layer, and a data processing module for processing raw data from geological exploration and analyzing the geological properties of the shale layer;

[0014] The dissolution and extraction efficiency optimization model includes a fluid dynamics simulation module and an optimization algorithm module. The fluid dynamics simulation module is used to simulate the flow and dissolution process of supercritical CO2 in shale formations. The optimization algorithm module optimizes the CO2 injection strategy and fluid flow path based on the simulation results to improve the dissolution and extraction efficiency.

[0015] Real-time monitoring and adjustment software includes a data acquisition module, a control module and an alarm module. The data acquisition module is used to collect pressure, temperature and flow data during the injection and production process. The control module automatically adjusts the injection and production parameters based on real-time data. The alarm module is used to issue an alarm under abnormal circumstances.

[0016] Preferably, the dissolution and extraction efficiency optimization model includes a fluid dynamics simulation module for simulating the flow and dissolution process of supercritical CO2 in the shale layer, and the formula is as follows:

[0017]

[0018] 0kP

[0019]

[0020] Preferably, the real-time monitoring and adjustment software includes a data acquisition module for collecting pressure, temperature and flow data during the injection and production processes.

[0021] Preferably, the real-time monitoring and adjustment software includes a control module for automatically adjusting injection and production parameters based on real-time data, as follows:

[0022] QUR

[0023]

[0024] x(k+1)=Ax(k)+Bu(k)

[0025] y(k)=Cx(k)+Du(k)

[0026]

[0027] Preferably, the injection system and the production system are both made of high temperature and high pressure resistant materials to meet the requirements of use in a supercritical CO2 environment.

[0028] Preferably, the cooling module is used to cool and condense the recovered CO2, and the geological property analysis software also includes a data processing module for processing raw data from geological exploration.

[0029] Preferably, the dissolution and extraction efficiency optimization model includes an optimization algorithm module for optimizing the injection strategy based on the simulation results, and the real-time monitoring and adjustment software includes an alarm module for issuing an alarm in abnormal situations.

[0030] Preferably, the distributed control module is used to control fluid extraction from a plurality of production wells.

[0031] (3) Beneficial effects

[0032] The present invention provides a supercritical CO2 integrated development device for low-maturity shale oil. It has the following beneficial effects:

[0033] The dual-medium model and fluid dynamics simulation module accurately describe the matrix and fracture characteristics of the shale layer, optimize the contact efficiency between CO2 and shale oil, and improve the dissolution and extraction effects. The real-time monitoring and adjustment software automatically adjusts injection and production parameters based on real-time data and issues alarms in abnormal situations to ensure the stability and safety of system operation. The cooling module is used to cool and condense the recovered CO2, realizing the recycling of CO2 and reducing environmental impact. The injection system and production system use high-temperature and high-pressure resistant materials such as nickel-based alloys, titanium alloys and stainless steel to ensure the long-term stable operation of the equipment in a supercritical CO2 environment. The geological property analysis software and dissolution and extraction efficiency optimization model provide a scientific basis based on geological exploration data and simulation results to optimize injection strategies and fluid flow paths, thereby improving the overall efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 Schematic diagram of the separation and recovery system structure of the present invention;

[0036] Figure 3 This is a schematic diagram of the production system structure of the present invention;

[0037] Figure 4 This is a schematic diagram of the injection system structure of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] like Figure 1-4 As shown, an embodiment of the present invention provides a supercritical CO2 integrated development device for low-maturity shale oil, comprising:

[0040] The supercritical CO2 generation system includes a compressor, a heater, a temperature sensor and a pressure sensor. The compressor is used to pressurize the CO2 gas to a supercritical state, the heater is used to heat the pressurized CO2 gas to a supercritical temperature, and the temperature sensor and pressure sensor are used to monitor and adjust the temperature and pressure of CO2 in real time to ensure that it remains in a supercritical state.

[0041] The injection system includes multiple injection wells, injection pipelines and a distribution control module. Supercritical CO2 is transported to the injection wells through the injection pipelines. The distribution control module controls the distribution of CO2 in multiple injection wells to ensure uniform distribution of supercritical CO2 in the shale layer. Both the injection system and the production system are made of high-temperature and high-pressure resistant materials to meet the requirements of use in a supercritical CO2 environment. The distribution control module is used to control fluid extraction from multiple production wells.

[0042] The dissolution and extraction system includes a fracture network and a dual-medium model. In the shale layer, supercritical CO2 contacts the shale oil through the fracture network and dissolves the hydrocarbons therein. The dual-medium model is used to describe the matrix and fracture characteristics of the shale layer and optimize the contact efficiency between CO2 and shale oil. The dissolution and extraction efficiency optimization model includes a fluid dynamics simulation module to simulate the flow and dissolution process of supercritical CO2 in the shale layer. The formula is as follows:

[0043]

[0044] PcqI

[0045]

[0046] The dissolution and extraction efficiency optimization model includes an optimization algorithm module for optimizing the injection strategy based on the simulation results, and the real-time monitoring and adjustment software includes an alarm module for issuing alarms in abnormal situations.

[0047] The production system includes multiple production wells, production pipelines and a distribution control module. Dissolved hydrocarbon fluid is transported to the surface through the production pipelines. The distribution control module controls the fluid extraction from multiple production wells to improve the recovery rate of dissolved hydrocarbon fluid.

[0048] The separation and recovery system includes a multi-stage separator, a cooling module and a recovery pipeline. The multi-stage separator is used to separate supercritical CO2 and shale oil. The cooling module is used to cool and condense the recovered CO2. The recovery pipeline transports the cooled CO2 to the supercritical CO2 generation system for reuse. The cooling module is used to cool and condense the recovered CO2. The geological property analysis software also includes a data processing module for processing raw data from geological exploration.

[0049] The geological property analysis software includes a three-dimensional geological modeling module, which is used to construct a three-dimensional geological model of the shale layer, and a data processing module which is used to process raw data from geological exploration and analyze the geological properties of the shale layer.

[0050] The dissolution and extraction efficiency optimization model includes a fluid dynamics simulation module and an optimization algorithm module. The fluid dynamics simulation module is used to simulate the flow and dissolution process of supercritical CO2 in shale layers. The optimization algorithm module optimizes the CO2 injection strategy and fluid flow path based on the simulation results to improve the dissolution and extraction efficiency.

[0051] The real-time monitoring and adjustment software includes a data acquisition module, a control module, and an alarm module. The data acquisition module is used to collect pressure, temperature, and flow data during the injection and production process. The control module automatically adjusts the injection and production parameters based on real-time data. The alarm module is used to issue an alarm in abnormal situations. The real-time monitoring and adjustment software includes a data acquisition module for collecting pressure, temperature, and flow data during the injection and production process. The real-time monitoring and adjustment software includes a control module for automatically adjusting the injection and production parameters based on real-time data. The formula is as follows:

[0052] QUR

[0053]

[0054] x(k+1)=Ax(k)+Bu(k)

[0055] y(k)=Cx(k)+Du(k)

[0056]

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A supercritical CO2 integrated development device for low-maturity shale oil, characterized by: include: A supercritical CO2 generation system includes a compressor, a heater, a temperature sensor, and a pressure sensor. The compressor is used to pressurize the CO2 gas to a supercritical state. The heater is used to heat the pressurized CO2 gas to a supercritical temperature. The temperature sensor and pressure sensor are used to monitor and adjust the temperature and pressure of the CO2 in real time to ensure that it remains in a supercritical state. The injection system includes multiple injection wells, injection pipelines, and a distribution control module. Supercritical CO2 is transported to the injection wells through the injection pipelines. The distribution control module controls the distribution of CO2 in multiple injection wells to ensure uniform distribution of supercritical CO2 in the shale layer. dissolution and extraction systems, including fracture networks and dual-media models, in shale formations; A production system comprising a plurality of production wells, production pipelines and a distribution control module, wherein dissolved hydrocarbon fluid is transported to the surface through the production pipelines, and the distribution control module controls fluid extraction from the plurality of production wells to improve the recovery rate of the dissolved hydrocarbon fluid; Separation and recovery system, including a multi-stage separator, a cooling module and a recovery pipeline. The multi-stage separator is used to separate supercritical CO2 and shale oil; Geological property analysis software, including a 3D geological modeling module for constructing a 3D geological model of the shale layer, and a data processing module for processing raw data from geological exploration and analyzing the geological properties of the shale layer; A dissolution and extraction efficiency optimization model, including a fluid dynamics simulation module and an optimization algorithm module. The fluid dynamics simulation module is used to simulate the flow and dissolution process of supercritical CO2 in shale formations. Real-time monitoring and adjustment software, including data acquisition module, control module and alarm module. The data acquisition module is used to collect pressure, temperature and flow data during injection and production; The dissolution and extraction efficiency optimization model includes a fluid dynamics simulation module for simulating the flow and dissolution process of supercritical CO2 in shale layers. The formula is as follows: 。 2. The supercritical CO2 integrated development device for low-maturity shale oil according to claim 1, characterized in that: The real-time monitoring and adjustment software includes a data acquisition module for collecting pressure, temperature and flow data during the injection and production processes.

3. The supercritical CO2 integrated development device for low-maturity shale oil according to claim 1, characterized in that: The real-time monitoring and adjustment software includes a control module for automatically adjusting injection and production parameters based on real-time data. The formula is as follows: 。 4. The supercritical CO2 integrated development device for low-maturity shale oil according to claim 1, characterized in that: The injection system and the production system are both made of high temperature and high pressure resistant materials to meet the use requirements in a supercritical CO2 environment.

5. The supercritical CO2 integrated development device for low-maturity shale oil according to claim 1, characterized in that: The cooling module is used to cool and condense the recovered CO2, and the geological characteristic analysis software also includes a data processing module for processing raw data from geological exploration.

6. The supercritical CO2 integrated development device for low-maturity shale oil according to claim 1, characterized in that: The dissolution and extraction efficiency optimization model includes an optimization algorithm module for optimizing the injection strategy based on simulation results, and the real-time monitoring and adjustment software includes an alarm module for issuing an alarm in abnormal situations.

7. The supercritical CO2 integrated development device for low-maturity shale oil according to claim 1, characterized in that: The distributed control module is used to control fluid extraction from a plurality of production wells.

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