In-situ testing system for host-guest liquid gating membrane for petroleum displacement

Abstract

The utility model discloses a host-guest liquid gating membrane in-situ test system for petroleum displacement. The host-guest liquid gating membrane in-situ test system comprises a control unit, a membrane preparation module, a detection unit, an analysis unit and a feedback module, the control unit is communicated with the device film preparation module; the control unit comprises an input channel and an output channel which are positioned on two sides of the membrane preparation module and are used for conveying test fluid; the membrane preparation module comprises a gating channel; the gating channel is formed by matching a pore membrane material and gating liquid; the gating liquid at least partially infiltrates the pore membrane, and the gating liquid and the pore membrane are matched to form a gating channel of the fluid flow channel; the detection unit is used for receiving a signal generated by the test fluid under the channel, and the analysis unit is connected with the signal of the detection unit; and the feedback module is connected with the analysis unit and the control unit and is used for adjusting the control unit according to the received signal of the analysis unit. The petroleum displacement testing device can be used for petroleum displacement testing.

Description

Technical Field

[0001] This utility model relates to an in-situ testing system for host and guest liquid gated membranes used in petroleum displacement. Background Technology

[0002] To improve oil recovery efficiency, oil displacement methods can be categorized into three types based on different stages of oilfield development. Primary oil recovery relies on the reservoir's natural energy for crude oil extraction, with a recovery rate of only 5%-10%. Secondary oil recovery maintains reservoir pressure through artificial water (or gas) injection. When there are no strong water-bearing layers in the reservoir, injected water can not only maintain reservoir pressure but also drive oil out by filling reservoir pores. However, due to capillary forces and the heterogeneity of small-scale reservoirs, most of the remaining oil remains trapped in the reservoir and cannot be removed. Secondary oil recovery can achieve a recovery rate of 30%-40%. Tertiary oil recovery technology, also known as enhanced oil recovery (EOR) technology, targets the unremovable oil in the remaining oil, using physical, chemical, and biological techniques to remove the residual oil and improve crude oil recovery. EOR technology can extend the production cycle of oil fields and increase the recoverability of remaining oil in oil fields, but it has technical defects, such as excessive consumption of non-renewable energy by burning oil layers, large adsorption losses of surfactant flooding, and high costs. Summary of the Invention

[0003] This invention addresses the issues of developing novel liquid gating systems and advancing the design of oil displacement systems. It develops a new in-situ testing system for host-guest liquid gating membranes used for oil displacement, which features stronger and more stable host-guest hydrogen bonding and excellent displacement effect. The system is simple to design and easy to operate, and can perform oil displacement tests on different oil phase systems with universality, meeting the displacement testing needs of crude oil in different regions.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A novel in-situ testing system for host-guest liquid-gated membranes used in petroleum displacement includes a control unit, a membrane preparation module, a detection unit, an analysis unit, and a feedback module. The membrane preparation module includes a gated channel formed by a porous membrane material and a gated liquid. The gated liquid at least partially wets the porous membrane, and the two work together to form a fluid flow channel within the gated channel. The delivery unit is connected to the device testing unit. The control unit is connected to the device membrane preparation module. The control unit includes input and output channels located on both sides of the membrane preparation module for delivering the test fluid.

[0006] The membrane preparation module is used to prepare membranes with different wettability / pore size characteristics. By immersing two membranes with different affinities in the oil phase and the aqueous phase respectively, and then bonding the two membranes together, a host-guest hydrogen bond liquid gating system can be formed.

[0007] The test fluids include, but are not limited to, oil phases such as octane, decane, and hexadecane. The pore membrane material is a functional multi-scale pore membrane material, specifically referring to functional materials with pore structures at different scales, either single or multiple, including functional multi-scale pore membrane materials such as porous nylon membranes and porous PTFE membranes. The gated liquid refers to a functional liquid with single or multiple components exhibiting flow dynamics, including aqueous solutions containing surfactants. The test liquid contains solutions of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, etc.

[0008] The gated liquid and the test fluid are immiscible. The gated liquid binds to the porous membrane material through chemical bonds or physical adsorption.

[0009] Optionally, the membrane preparation module has an irritating response to the test fluid of the control unit.

[0010] Optionally, the response behavior is that the test liquid in the membrane preparation module undergoes a host-guest hydrogen bonding reaction, which changes the pore properties of the porous membrane, such as the pore size, chemical structure, or wettability with the functional fluid, thereby changing the transmembrane pressure threshold of the gated channel for the test fluid.

[0011] Optionally, the control unit further includes a delivery unit for conveying the test fluid, the delivery unit including an input channel and an output channel for conveying the test fluid. The delivery unit communicates with the cavity, and the liquid output channel and liquid input channel are located on both sides of the gated channel. The delivery unit is used to control the delivery mode of the test fluid, including but not limited to constant pressure, constant flow, etc., and can receive feedback and control the transport status of the test fluid.

[0012] Optionally, the gated channel is encapsulated in the cavity of the membrane preparation module; the cavity has an input channel and an output channel located on both sides of the gated channel, and the input channel, the output channel and the gated channel form the fluid flow channel.

[0013] Optionally, the detection unit is a pressure sensor, which is used to detect the pressure of the test fluid in the input and output channels on both sides of the membrane preparation module.

[0014] Optionally, the feedback module is connected to the analysis unit and the control unit, and is used to adjust the control unit according to the signal received from the analysis unit.

[0015] Optionally, the analysis unit is connected to the feedback module. The analysis unit is an online display computer or other electronic device that can receive and store data and perform real-time analysis and processing of signals. The signal analysis forms include, but are not limited to, ti (time-current) curves, tP (time-pressure) curves, tv (time-voltage) curves, etc.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This utility model is designed for testing the oil displacement efficiency of different systems. By leveraging the different forces exerted by porous membrane materials with varying affinities to different oils, it achieves a good crude oil displacement effect and provides a new liquid gating system for studying different oil displacement systems.

[0018] 2. The membrane preparation module of this utility model can prepare membranes with different wettability / pore size characteristics. By combining two membranes with different affinities with oil and water phases to form a host-guest hydrogen bond liquid gating system, it is possible to monitor the performance of multi-scale porous membrane materials under different crude oil stimuli-responsive regulation in real time. It can be used to explore new applications of pore material design in new fields.

[0019] 3. The testing system of this utility model has selectivity, responsiveness and universality. Different displacement results can be achieved by changing different membrane materials or gating liquids.

[0020] 4. The experimental results of this system are visually apparent and can be directly observed through the detection and analysis units. By observing and analyzing the dynamic pressure and recovery rate curves output by the computer, the oil displacement effect of this system on different systems can be compared.

[0021] 5. This utility model solves the problems of high cost and complex operation of oil displacement detection devices, and provides new possibilities for designing good oil displacement detection devices with simple principles and low cost. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 is a schematic diagram of the structure of the host and guest liquid gated membrane in-situ testing system for petroleum displacement according to an embodiment;

[0024] Figure 2 shows the pressure signal data recording of the experimental test of the composite PTFE-Nylon (1μm, 5μm and 8 μm) membrane systems with different initial pore sizes in Example 1;

[0025] Figure 3 is a schematic diagram of the test results of Example 2;

[0026] Figure 4 is a schematic diagram of the test results of Example 3;

[0027] Figure 5 is a schematic diagram of the test results of Example 4. Detailed Implementation

[0028] Referring to Figure 1, the present invention provides an in-situ testing system for a gated membrane used in petroleum displacement, comprising a control unit 010, a membrane preparation module 020, a detection unit 030, an analysis unit 040, and a feedback module 050. The membrane preparation module 020 includes a cavity 021a and a gated channel 021, the gated channel 021 being installed within the cavity 021a. The gated channel 021 is formed by a porous membrane material and a gated liquid. The control unit 010 includes an input channel 011 and an output channel 012, which are located on opposite sides of the gated channel 021 and communicate with the cavity 021a for conveying the test fluid. The detection unit 030 is signal-connected to the analysis unit 040. The gated channel 021 responds to the stimulation of the test fluid, forming a host-guest hydrogen bond. The detection unit 030 receives the signal generated by the test fluid through the gated channel 021 and transmits it to the analysis unit 040. The analysis unit 040 performs real-time analysis and processing of the signal. The feedback module 050 is connected to the signal analysis unit 040 and the control unit 010. The control unit 010 receives the information from the feedback module 050 and controls the transport status of the test fluid.

[0029] The following basic operating steps are included when testing liquid gating systems for different oil displacement systems:

[0030] Step 1: Select two porous membrane materials with different affinities (such as porous nylon membranes or porous PTFE membranes with different pore sizes), and select gate liquids of different concentrations (such as cyclodextrin solution or dodecane). Immerse the two different porous membrane materials in the different gate liquids, and then bond the two different porous membrane materials together. Hydrophilic functional molecules (such as cyclodextrin) and hydrophobic functional molecules (such as dodecane) form a host-guest characteristic thin film with certain mechanical strength and stability at the interface between the two membranes through hydrogen bonding, thereby forming the gate channel 021 of the device test unit 020. The test fluid is air, aqueous solution, oil solution, or a mixture of air-water, air-oil, water-oil, or air-water-oil. The detection unit 030 collects the signal of the pressure sensor of the test fluid pressure between the input channel 011 and the output channel 012 and transmits it to the analysis unit 040.

[0031] Step 2: The test fluid enters the system from the input channel 011 and leaves the system from the output channel 012 under the control of the delivery unit.

[0032] The test fluid can interact with the gated channel to change the pressure threshold of transmembrane transmission, causing the detection unit 030 to generate different signal changes.

[0033] The third step involves recording and analyzing the pressure of the fluid in the input and output channels using an external pressure sensor. This allows for real-time monitoring of the membrane properties (membrane pressure or pressure) of the system, providing gating information for the fluid entering and exiting the porous membrane material.

[0034] Step 4: The pressure sensor converts the measured pressure or pressure signal into an electrical signal and transmits it to the computer. The computer then saves, processes, and analyzes the data. When needed, the feedback module 050 can also generate signal feedback to the transmission unit.

[0035] Example 1: Pressure variation of composite PTFE-Nylon membrane systems with different initial pore sizes

[0036] refer to Figure 2 An aqueous phase and an oil phase (in this embodiment, 0.004 mol / L β-cyclodextrin aqueous solution and dodecane are used respectively) are selected to react synergistically at the oil-water interface to form a host-guest complex through hydrogen bonding. The type and concentration of cyclodextrin in the aqueous phase and the composition of the oil phase all affect the properties of the film at the interface.

[0037] Specifically, two membranes with different affinities (PTFE and Nylon membranes in this embodiment) are immersed in β-cyclodextrin and alkane solutions respectively for a period of time (Nylon membrane immersed in β-cyclodextrin solution, PTFE membrane immersed in dodecane). The two membranes are then stacked, and a characteristic membrane is formed between the nylon and PTFE membranes. The membrane formation is characterized using a liquid-gated pressure testing system. Immediately after the two membranes are stacked, the transmembrane pressure (transport fluid is air) is tested. Two hours later, another transmembrane pressure test is performed. If an increase in transmembrane pressure is observed, it indicates that the characteristic membrane has formed. The difference in transmembrane pressure also characterizes the mechanical strength of the characteristic membrane to some extent. This serves as the gated channel for the membrane preparation module 020.

[0038] The pressure sensor in detection unit 030 is used to test the fluid transport pressure in input channel 011. The pressure sensor converts the measured pressure or pressure signal into a current signal and transmits it to the computer. The computer, as the data analysis tool in analysis unit 040, performs real-time analysis and processing of the signal to obtain the tP (time-pressure) curve. Output channel 012 is set. When the pore size of the membrane material in gate channel 021 is changed—specifically, when the pore size of one membrane material in a composite PTFE-Nylon membrane system remains constant while the pore size of another membrane material is changed—the transmembrane behavior of the transported fluid (such as the transmembrane pressure signal) will also change. Transport fluid is introduced through input channel 011. When the input pressure at the gate channel is lower than the system's gate pressure threshold, the gate channel remains closed, and the signal is characterized by a continuous increase in system pressure. When the input pressure at the gate channel is higher than the gate pressure threshold of the porous membrane material, the gate channel opens, and the transport fluid flows out from output channel 012. Specifically, in the initial reaction state of the composite PTFE-Nylon membrane system, the tP (time-pressure) curve shows that when the PTFE membrane pore size is fixed at 1 μm, the transmembrane pressure decreases with increasing nylon membrane pore size (1 μm, 5 μm, and 8 μm). Then, when the PTFE membrane pore size is fixed at 5 μm, the transmembrane pressure is not significantly different from before, indicating that the Nylon membrane and its affinity for aqueous solution play a dominant role in the transmembrane pressure of the composite system. By designing and selecting the initial pore size of the membrane system (e.g., composite PTFE-Nylon membrane systems with different initial pore sizes) to control different transport pressures, this signal data can control whether the mass transport channels are open, thus achieving selective output of multi-component fluids. For example... Figure 2 Figure 1 shows the experimental pressure signal data recordings of composite PTFE-Nylon (1μm, 5μm and 8 μm) membrane systems with different initial pore sizes.

[0039] Example 2: Pressure signal variation in a liquid gating system with different flow rates

[0040] refer to Figure 3An aqueous phase and an oil phase (specifically, 0.004 mol / L β-cyclodextrin and dodecane in this embodiment) are selected to form a host-guest complex through hydrogen bonding, which reacts synergistically at the oil-water interface. Two membranes with different affinities are selected; in this embodiment, a PTFE membrane with an average pore size of 5 μm is impregnated in dodecane, and a Nylon membrane with an average pore size of 5 μm is impregnated in 0.004 mol / L β-cyclodextrin. The two membranes then composite to form a host-guest hydrogen bond, serving as the gated channel for membrane preparation module 020. The pressure sensor in detection unit 040 is used to test the fluid transport pressure signal in input channel 011, and the computer serves as the signal analysis tool in analysis unit 050. Output channel 012 is set so that changing the flow rate of the transport fluid will alter the transmembrane behavior of the transport fluid (such as the transmembrane pressure of the composite membrane system). The transport fluid is introduced through input channel 011. When the input pressure at the gated channel is lower than the system's gated pressure threshold, the gated channel remains closed, and the signal is represented by a continuous increase in system pressure. When the input pressure at the gated channel is higher than the gated pressure threshold of the porous membrane material, the gated channel opens, and the transport fluid flows out through output channel 012. In the initial reaction state of the composite PTFE-Nylon membrane system, when the PTFE membrane pore size is fixed at 5 μm, the tP (time-pressure) curve shows that the transmembrane pressure increases with the increase of the transport fluid flow rate (from 0.5 mL / min to 3 mL / min). This indicates that the host-guest hydrogen bond film formed at the oil-water interface of the composite membrane system has mechanical strength and can resist certain external pressures. At this point, by controlling the flow rate of the transport fluid, different gated transmembrane pressure signals can be generated, thereby controlling the opening of the material transport channels and achieving selective output of multi-component fluids. By recording relevant experimental data, this system provides data support for the application of membrane materials in material separation by changing the flow rate of the transport fluid. For example... Figure 3 The experimental pressure signal data recording of the composite PTFE-Nylon membrane system with different flow rates of transport fluid (0.5 mL / min to 3 mL / min) is shown in the figure.

[0041] Example 3: Crude Oil Displacement Effect Test in the Northern Three Regions

[0042] refer to Figure 4An aqueous phase and an oil phase (in this embodiment, 0.004 mol / L β-cyclodextrin and crude oil from the North Three Regions) are selected to form a host-guest complex through hydrogen bonding, which reacts synergistically at the oil-water interface. Two membranes with different affinities are selected. In this embodiment, a PTFE membrane with an average pore size of 5 μm is impregnated in crude oil from the North Three Regions, and a Nylon membrane with an average pore size of 5 μm is impregnated in 0.004 mol / L β-cyclodextrin. The two membranes are composited to form a host-guest hydrogen bond, which serves as the gated channel of the membrane preparation module 020. The pressure sensor of the detection unit 040 is used to test the fluid transport pressure signal of the input channel 011, and the computer serves as the signal analysis tool of the analysis unit 050. An output channel 012 is set so that when the flow rate of the transport fluid is changed, the transmembrane behavior of the transport fluid (such as the transmembrane pressure of the composite membrane system) will also change. The transport fluid is introduced through input channel 011. When the input pressure at the gated channel is lower than the system's gated pressure threshold, the gated channel remains closed, and the signal is represented by a continuous increase in system pressure. When the input pressure at the gated channel is higher than the gated pressure threshold of the porous membrane material, the gated channel opens, and the transport fluid flows out through output channel 012. The tP (time-pressure) curve compares the transmembrane pressure changes of the composite membrane system before and after 2 hours of reaction. It is found that as time increases, the transmembrane pressure of the system after 2 hours is higher than the initial state. This indicates that the crude oil from the North China Plain is suitable for this composite membrane system, and can be used as the oil phase for host-guest hydrogen bonding reactions with good displacement effects. By recording relevant experimental data, this system provides data support for the application of membrane materials in the oil displacement of crude oil from the North China Plain. For example... Figure 4 Figure 1 shows the pressure signal data recording of the composite PTFE-Nylon membrane system used in the crude oil displacement effect test in the North Three Regions.

[0043] Example 4: Test of Oil Displacement Effect of Middle Eastern Crude Oil

[0044] refer to Figure 5A host-guest complex is formed by selecting an aqueous phase and an oil phase (in this embodiment, β-cyclodextrin and Middle Eastern crude oil) through hydrogen bonding, and the complex reacts synergistically at the oil-water interface. Two membranes with different affinities were selected (in this embodiment, PTFE with an average pore size of 5 μm impregnated in Middle Eastern crude oil and Nylon membrane with an average pore size of 5 μm impregnated in 0.004 mol / L β-cyclodextrin were used to form host-guest hydrogen bonds, serving as the gated channel of membrane preparation module 020). The pressure sensor of detection unit 040 was used to test the fluid transport pressure signal of input channel 011, and the computer was used as the signal analysis tool of analysis unit 050. Output channel 012 was set so that when the flow rate of the transport fluid was changed, the transmembrane behavior of the transport fluid (such as the transmembrane pressure signal of the composite membrane system) would also change. When the transport fluid was introduced into input channel 011, if the input pressure at the gated channel was lower than the system's gated pressure threshold, the gated channel was not opened, and the signal was shown as a continuous increase in system pressure. When the input pressure at the gated channel was higher than the gated pressure threshold of the porous membrane material, the gated channel opened, and the transport fluid flowed out from output channel 012. In the tP (time-pressure) curve, the reaction time was 2 h. A comparison of the transmembrane pressure changes before and after the experiment revealed that the transmembrane pressure of the system was higher after 2 hours than at the initial state. This indicates that Middle Eastern crude oil is suitable for this composite membrane system, which can act as the oil phase in host-guest hydrogen bonding reactions with good displacement effects. By recording relevant experimental data, this system provides data support for the application of membrane materials in the oil displacement of Middle Eastern crude oil. For example... Figure 5 Figure 1 shows the pressure signal data recording of the composite PTFE-Nylon membrane system used in the Middle East crude oil displacement effect test.

[0045] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model patent and the contents of the specification should still fall within the scope of the present utility model.

Claims

1. A host-guest liquid gated membrane in-situ test system for oil displacement, characterized in that: The system comprises a control unit, a membrane preparation module, a detection unit, an analysis unit and a feedback module; the control unit is connected to the membrane preparation module; the control unit comprises an input channel and an output channel on both sides of the membrane preparation module for transporting test fluid; the membrane preparation module comprises a gate channel; the gate channel is formed by a pore membrane material cooperating with a gate liquid; the gate liquid at least partially infiltrates the pore membrane material and the two cooperate to form a fluid flow channel; the detection unit is used to receive signals generated by the test fluid in the channel; the analysis unit is connected to the detection unit; the feedback module is connected to the analysis unit and the control unit and adjusts the control unit according to the received signals of the analysis unit.

2. A host-guest liquid-gated membrane in-situ test system for oil displacement according to claim 1, characterized in that: The membrane preparation module comprises two membranes with different affinities that are attached together; an oil phase and a water phase respectively infiltrate the two membranes to form a host-guest hydrogen-bonding liquid gating system.

3. A host-guest liquid-gated membrane in-situ testing system for oil displacement according to claim 1, characterized in that: The membrane preparation module has a stimulating physical response behavior to the test fluid of the control unit.

4. A host-guest liquid-gated membrane in-situ test system for oil displacement according to claim 3, characterized in that: The response behavior is that the transmembrane pressure threshold of the gate channel changes when the test fluid passes through.

5. A host-guest liquid-gated membrane in-situ test system for oil displacement according to claim 1, characterized in that: The detection unit is a pressure sensor that is used to detect the pressure of the test fluid in the input channel and the output channel on both sides of the membrane preparation module.

6. A host-guest liquid-gated membrane in-situ test system for oil displacement according to claim 1, characterized in that: The control unit further comprises a transport unit for transporting the test fluid; the transport unit comprises an input channel and an output channel for transporting the test fluid; the transport unit is connected to a cavity; the liquid output channel and the liquid input channel are located on both sides of the gate channel.

7. A host-guest liquid-gated membrane in-situ testing system for oil displacement according to claim 1, characterized in that: The gate channel is encapsulated in the cavity of the membrane preparation module; the cavity has an input channel and an output channel located on both sides of the gate channel; the input channel, the output channel and the gate channel form the fluid flow channel.

8. A host-guest liquid-gated membrane in-situ testing system for oil displacement according to claim 1, characterized in that: The analysis unit is connected to the feedback module; the analysis unit analyzes and processes the signals of the detection unit in real time; the feedback module is connected to the control unit; the control unit receives feedback and controls the transportation state of the test fluid.

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