Experimental device and method for simulating carbon dioxide micro-nano bubbles to improve recovery efficiency and monitor storage

Abstract

The invention discloses an experimental device and method for simulating carbon dioxide micro-nano bubbles to improve the recovery ratio and monitoring storage, belongs to the technical field of oil and gas field development, and mainly aims at exploring the application potential of the carbon dioxide micro-nano bubbles in the aspect of improving the oil reservoir recovery ratio. A high-strength X-CT technology is used for monitoring the sealing effect of the carbon dioxide in the reservoir stratum in real time; the experimental device for simulating the carbon dioxide micro-nano bubbles to improve the recovery ratio and monitor the sealing comprises a first Quizix pump, a second Quizix pump, a confining pressure pump, a gas mass flow controller, a micro-nano bubble generation device, a micro-nano bubble phase state visualization device, a waste liquid collection device, a six-way valve, an oil source container, a gas source container, a liquid source container, a first pressure gauge and a second pressure gauge. The system comprises a core holder, a high-strength X-CT scanning device, an image capture camera and a master control system. The device can simulate carbon dioxide micro-nano bubbles to improve the crude oil recovery rate and monitor the sealing effect of carbon dioxide in real time.

Description

Technical Field

[0001] The invention designs an experimental device and method for simulating carbon dioxide micro-nano bubbles to improve recovery and monitor storage, belonging to the technical field of oil and gas field development. Background Art

[0002] The "dual carbon" strategy is China's new efforts and contributions to address global climate change. In the field of oil and gas field development, carbon dioxide flooding can not only improve crude oil recovery, but also seal carbon dioxide, which is one of the key methods to achieve the "dual carbon" strategy. Due to the problems of low sweep efficiency and easy gas channeling in traditional carbon dioxide flooding technology, carbon dioxide foam flooding is often used in actual applications.

[0003] Traditional foam systems have poor stability under high-temperature and high-pressure reservoir conditions and are difficult to inject into low-permeability reservoirs. To solve this problem, carbon dioxide micro-nano bubble flooding technology, which is different from traditional foam flooding, can be used. Micro-nano bubbles have stronger stability and mass transfer efficiency, and can effectively prevent gas channeling. Using carbon dioxide micro-nano bubbles to flood oil can not only improve the recovery rate, but also achieve carbon dioxide storage. With the development of X-CT imaging and tomography technology in recent years, high-intensity X-CT technology has shown its potential as an effective means of monitoring carbon dioxide micro-nano bubble storage.

[0004] To this end, we proposed an experimental device and method to simulate carbon dioxide micro-nano bubbles to enhance oil recovery and monitor storage. Summary of the invention

[0005] The purpose of the present invention is to improve the traditional carbon dioxide foam flooding, utilize carbon dioxide micro-nano bubbles to achieve enhanced crude oil recovery, and conduct real-time monitoring of the stored carbon dioxide to evaluate the storage effect of carbon dioxide micro-nano bubbles.

[0006] To achieve the above objectives, the present invention provides an experimental device and method for simulating carbon dioxide micro-nano bubbles to enhance oil recovery and monitor storage, and the specific technical scheme is as follows.

[0007] Experimental device used for the experimental method: a total control system, a high-intensity X-CT scanning device, a micro-nano bubble generating device, a micro-nano bubble phase state visualization device, a first Quizix pump, a second Quizix pump, a confining pressure pump, a gas mass flow controller, a liquid source container, a gas source container, an oil source container, an image capture camera, and a core holder; the core holder is loaded with a core;

[0008] The first Quizix pump is connected to the oil source container and the gas source container through a one-way valve a and a one-way valve b respectively, the oil source container oil outlet is connected to the six-way valve through a one-way valve d, and the gas source container gas outlet is connected to the gas mass flow controller and the left interface of the micro-nano bubble generating device through a one-way valve e;

[0009] The second Quizix pump is connected to the liquid source container through a one-way valve c, the liquid outlet of the liquid source container is connected to the right interface of the micro-nano bubble generating device through a one-way valve f, and the outlet of the micro-nano bubble generating device is connected to the six-way valve;

[0010] The inlet of the micro-nano bubble phase state visualization device is connected to the six-way valve, and the outlet is connected to the six-way valve through a flow control valve;

[0011] The rear end of the core holder is connected to the waste liquid collection device through a back pressure valve, and the air outlet of the confining pressure pump is connected to the lower end of the core holder;

[0012] A high-intensity X-CT scanning device is arranged on the periphery of the core holder;

[0013] An image capture camera is arranged at the periphery of the micro-nano bubble phase state visualization device;

[0014] The front and rear ends of the core holder are respectively provided with a first pressure gauge and a second pressure gauge;

[0015] The first Quizix pump, the second Quizix pump, the high-intensity X-CT scanning device, and the image capture camera are all electrically connected to the overall control system;

[0016] An experimental device and method for simulating carbon dioxide micro-nano bubbles to improve oil recovery and monitor storage, comprising the following steps:

[0017] S1. Turn on the high-intensity X-CT scanning device to perform real-time imaging analysis, put the dried core into the core holder, turn on the confining pressure pump to apply the set confining pressure to the core, open the one-way valve a and the one-way valve d, and the first Quizix pump drives the crude oil through the six-way valve to fill the core with the oil sample; close the one-way valve a and the one-way valve d, and open the back pressure valve to discharge the excess waste liquid;

[0018] S2, open the one-way valve b and the one-way valve e, the second Quizix pump drives the carbon dioxide gas source to enter the micro-nano bubble generating device from the left interface through the gas mass flow controller, open the one-way valve c and the one-way valve f, the second Quizix pump drives the groundwater to enter the micro-nano bubble generating device from the right interface;

[0019] S3, flowing the generated carbon dioxide micro-nano bubble dispersed phase into the micro-nano bubble phase state visualization device through a six-way valve, and turning on an image capture camera to record the phase state of the micro-nano bubbles;

[0020] S4, closing the flow control valve, injecting the dispersed phase of carbon dioxide micro-nano bubbles into the core holder for oil displacement, and using a pressure gauge and a high-intensity X-CT scanning device to analyze the process of carbon dioxide micro-nano bubbles displacing the oil sample;

[0021] S5. After the displacement is completed, the one-way valves b, c, e and f are closed to stop injecting carbon dioxide and groundwater into the micro-nano bubble generating device, and the six-way valve is closed to stop continuously injecting the dispersed phase of carbon dioxide micro-nano bubbles into the core holder;

[0022] S6. The high-intensity X-CT scanning device scans and images the core, and generates real-time images by monitoring the changes and diffusion of carbon dioxide micro-nano bubbles sealed in the core through the overall control system.

[0023] The present invention has the following advantages and beneficial effects: (1) low-cost and high-efficiency preparation of carbon dioxide micro-nano bubbles is achieved, while significantly improving the recovery rate; (2) through high-intensity X-CT scanning imaging technology, real-time monitoring and evaluation of the stability of the storage system is achieved, greatly improving the monitoring quality and efficiency.

[0024] In summary, the present invention has the advantages of being able to utilize carbon dioxide micro-nano bubbles to improve crude oil recovery and to monitor the geological storage effect of carbon dioxide nanobubbles in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a diagram of the experimental device of the present invention.

[0026] In the figure: 1- one-way valve a; 2- one-way valve b; 3- one-way valve c; 4- one-way valve d; 5- one-way valve e; 6- one-way valve f; 7- back pressure valve; 8- first Quizix pump; 9- second Quizix pump; 10- flow control valve; 11- confining pressure pump; 12- gas mass flow controller; 13- micro-nano bubble generating device; 14- waste liquid collecting device; 15- six-way valve; 16- micro-nano bubble phase state visualization device; 17- oil source container; 18- gas source container; 19- liquid source container; 20- first pressure gauge; 21- second pressure gauge; 22- core clamp; 23- high-intensity X-CT scanning device; 24- image capture camera; 25- overall control system. DETAILED DESCRIPTION

[0027] Example: Please refer to Figure 1In an embodiment of the present invention, an experimental device and method for simulating carbon dioxide micro-nano bubbles to improve oil recovery and monitor storage are provided. The structural features of the experimental device used for the experimental method are as follows: the device is mainly composed of a general control system 24, a high-intensity X-CT scanning device 23, a micro-nano bubble generating device 13, a micro-nano bubble phase state visualization device 16, a first Quizix pump 8, a second Quizix pump 9, a confining pressure pump 11, a gas mass flow controller 12, a liquid source container 19, a gas source container 18, an oil source container 17, a core clamp 22, and an image capture camera 24.

[0028] The present invention can be used to monitor the effect of injecting carbon dioxide nanobubbles into a reservoir for geological storage, and the effect of injecting carbon dioxide nanobubbles into a reservoir for geological storage is described below.

[0029] The first Quizix pump 8 is connected to the oil source container 17 and the gas source container 18 through a one-way valve a and a one-way valve b respectively, the oil outlet of the oil source container 17 is connected to the six-way valve 15 through a one-way valve d, and the gas outlet of the gas source container 18 is connected to the gas mass flow controller 12 and the left interface of the micro-nano bubble generating device 13 through a one-way valve e; the second Quizix pump 9 is connected to the liquid source container 19 through a one-way valve c, the liquid outlet of the liquid source container 19 is connected to the right interface of the micro-nano bubble generating device 13 through a one-way valve f, and the outlet of the micro-nano bubble generating device 13 is connected to the front end of the core holder 22 through the six-way valve 15; the micro-nano bubble phase state visualization device 16 The inlet is connected to the six-way valve 15, and the outlet is connected to the six-way valve 15 through the flow control valve 10; an image capture camera 24 is arranged on the periphery of the micro-nano bubble phase visualization device 16; the rear end of the core holder 22 is connected to the waste liquid collection device 14 through the back pressure valve 7, and the air outlet of the confining pressure pump 11 is connected to the lower end of the core holder 22; a high-intensity X-CT scanning device 23 is arranged on the periphery of the core holder 22; the front and rear ends of the core holder 22 are respectively provided with a first pressure gauge 20 and a second pressure gauge 21; the first Quizix pump 8, the second Quizix pump 9, the high-intensity X-CT scanning device 23, and the image capture camera 24 are all electrically connected to the overall control system 25;

[0030] The specific steps are as follows:

[0031] S1, open the high-intensity X-CT scanning device 23, perform real-time imaging analysis, put the dried core into the core holder 22, open the confining pressure pump 11 to apply the set confining pressure to the core, open the one-way valve a and the one-way valve d, and the first Quizix pump 8 drives the crude oil through the six-way valve 15 to fill the core with the oil sample; close the one-way valve a and the one-way valve d, and open the back pressure valve 7 to discharge the excess waste liquid;

[0032] S2, open the one-way valve b and the one-way valve e, the second Quizix pump 9 drives the carbon dioxide gas source to enter the micro-nano bubble generating device 13 from the left interface through the gas mass flow controller 12, open the one-way valve c and the one-way valve f, the second Quizix pump 9 drives the groundwater to enter the micro-nano bubble generating device 13 from the right interface;

[0033] S3, the generated carbon dioxide micro-nano bubble dispersed phase flows into the micro-nano bubble phase visualization device 16 through the six-way valve 15, and the image capture camera 24 is turned on to record the phase change of the micro-nano bubbles;

[0034] S4, closing the flow control valve 10, injecting the dispersed phase of carbon dioxide micro-nano bubbles into the core holder 22 for oil displacement, and using the first pressure gauge 20, the second pressure gauge 21, and the high-intensity X-CT scanning device 23 to record and analyze the process of carbon dioxide micro-nano bubbles displacing the oil sample;

[0035] S5. When the displacement is finished, the one-way valves b, c, e and f are closed to stop injecting carbon dioxide and groundwater into the micro-nano bubble generating device 13, and the six-way valve 15 is closed to stop continuously injecting the dispersed phase of carbon dioxide micro-nano bubbles into the core holder 22;

[0036] S6. The high-intensity X-CT scanning device 23 scans and images the core, and the overall control system 24 monitors the changes and diffusion of the carbon dioxide micro-nano bubbles sealed in the core to generate real-time images.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An experimental device and method for simulating carbon dioxide micro-nano bubbles to enhance oil recovery and monitor storage, characterized in that: The following experimental equipment is included: S100, the first Quizix pump (8) is connected to the oil source container (17) and the gas source container (18) respectively through the one-way valve a (1) and the one-way valve b (2), the oil outlet of the oil source container (17) is connected to the six-way valve (15) through the one-way valve d (4), the gas outlet of the gas source container (18) is connected to the gas mass flow controller (12) through the one-way valve e (5), and is connected to the left interface of the micro-nano bubble generating device (13); the second Quizix pump (9) is connected to the liquid source container (19) through the one-way valve c (3), the liquid outlet of the liquid source container (19) is connected to the right interface of the micro-nano bubble generating device (13) through the one-way valve f (6), and the outlet of the micro-nano bubble generating device (13) is connected to the core clamping device (11) through the six-way valve (15). The front end of the device (22) is connected to the micro-nano bubble phase state visualization device (16); the inlet is connected to the six-way valve (15), and the outlet is connected to the six-way valve (15) through the flow control valve (10); an image capture camera (24) is arranged on the periphery of the micro-nano bubble phase state visualization device (16); the rear end of the core holder (22) is connected to the waste liquid collection device (14) through the back pressure valve (7), the lower end is connected to the gas outlet of the confining pressure pump (11), the periphery is equipped with a high-intensity X-CT scanning device (23), and the front and rear ends thereof are respectively provided with a first pressure gauge (20) and a second pressure gauge (21); the first Quizix pump (8), the second Quizix pump (9), the high-intensity X-CT scanning device (23), and the image capture camera (24) are all electrically connected to the overall control system (25).

2. The experimental device and method for simulating carbon dioxide micro-nano bubbles to enhance oil recovery and monitor storage according to claim 1, characterized in that: The high-intensity X-CT scanning device (23) is a VT-X750 device, which has the function of monitoring the changes of carbon dioxide micro-nano bubbles in the core.

3. The experimental device and method for simulating carbon dioxide micro-nano bubbles to enhance oil recovery and monitor storage according to claim 1, characterized in that: The image capture camera (24) is a HT-GE1000C-T camera, which has the function of observing the phase state of carbon dioxide micro-nano bubbles.

4. The experimental device and method for simulating carbon dioxide micro-nano bubbles to enhance oil recovery and monitor storage according to claim 1, characterized in that: The micro-nano bubble phase state visualization device (16) is a high-temperature and high-pressure visual reactor, and its function is to visualize the phase state of carbon dioxide micro-nano bubbles.

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