A steady-state flow liquid injection-production simulation method

Abstract

This invention discloses a steady-state flow liquid injection-production simulation device, method, and application. The device includes a liquid flow control mechanism, a control analyzer, a storage tank, and a core container. The flow control mechanism includes at least three chambers and at least three delivery pumps. Each chamber is connected to a corresponding delivery pump. Each chamber is connected to the storage tank and the core container. The core container is adapted to hold the core. The control analyzer is signal-connected to each delivery pump. The control analyzer controls the operation of each delivery pump to, during the simulated injection process, fill each chamber with liquid from the storage tank and alternately circulate the liquid from each chamber into the core according to a set flow rate ratio. During the simulated production process, the liquid in the core is alternately circulated into each chamber according to a set flow rate ratio, and the liquid in each chamber is filled into the storage tank. This ensures that the liquid in at least three chambers is not simultaneously depleted during the injection-production simulation, preventing flow interruption and achieving steady-state flow liquid injection-production.

Description

Technical Field

[0001] This invention relates to the field of gas storage technology, and in particular to a steady-state flow liquid injection and production simulation method. Background Technology

[0002] Underground gas storage facilities are mainly porous gas storage facilities converted from depleted oil and gas reservoirs. Therefore, before constructing a gas storage facility, it is essential to fully understand the original physical properties of the oil and gas reservoir, study the injection and production operation mechanism of the converted oil and gas reservoir and its main influencing factors, especially the impact of the injection and production liquid flow rates on the storage capacity parameters of the gas storage facility, in order to guide the optimization of the gas storage facility's injection and production operation plan.

[0003] Underground gas storage facilities mainly consist of porous gas storage facilities. The Dazhangtuo gas storage facility, the longest-operating in China, began operation in 2002, but its construction and operational experience remains limited. Based on the operational data of multiple injection and production cycles of the Dagang Banqiao underground gas storage complex, the high-speed, high-flow-rate injection and production, as well as water intrusion, significantly impact the utilization of gas-bearing pore volume. Furthermore, given the moderate and highly heterogeneous reservoir properties, although 8-9 complete injection and production cycles have been completed, the storage capacity expansion rate is slow, far from reaching the designed working gas scale. Clearly, the conversion of depleted oil and gas reservoirs into underground gas storage facilities presents unique and complex challenges in terms of storage capacity formation mechanisms and the changing patterns of injection and production capacity. Research in this area is still relatively weak and requires further strengthening.

[0004] In the area of ​​injection and production experiments for porous gas storage facilities, research has been conducted on injection and production simulation systems for depleted oil and gas reservoirs. This research primarily focuses on simulating the gas injection and production processes within the storage facility to study the injection and production mechanisms during construction. However, there are shortcomings in the liquid flow control devices used in gas storage simulation experiments. During the injection and production operation of porous gas storage facilities, the process is influenced by multiple factors such as injection and production rates, operating pressure ranges, and water intrusion. Conventional oil and gas reservoir development experimental methods cannot simulate the reciprocating high-speed injection and production operation patterns during gas storage facility operation and their impact on construction efficiency. Summary of the Invention

[0005] To enrich the product types of steady-state liquid injection and production simulation devices, increase the selection space of steady-state liquid injection and production simulation methods, and better simulate the injection and production situation of gas storage facilities, this invention provides a steady-state liquid injection and production simulation device, method, and application.

[0006] In a first aspect, embodiments of the present invention provide a steady-state flow liquid injection and production simulation device, including a liquid flow control mechanism, a control analyzer, a liquid storage tank, and a core container;

[0007] The liquid flow control mechanism includes at least three chambers and at least three delivery pumps; each chamber is connected to a corresponding delivery pump.

[0008] The cavity is connected to the liquid storage tank and the core container respectively;

[0009] The core container is adapted to hold the core;

[0010] The control analyzer is connected to each of the delivery pumps via signals.

[0011] The control analyzer can control the operation of each of the delivery pumps to fill the liquid in the storage tank into each of the cavities during the simulated injection process, and to alternately circulate the liquid in each of the cavities into the core according to a set flow rate ratio; and during the simulated extraction process, to alternately circulate the liquid in the core into each of the cavities according to a set flow rate ratio, and to fill the liquid in each of the cavities into the storage tank.

[0012] In one or more alternative embodiments, the steady-state flow liquid injection and production simulation device further includes a temperature control chamber;

[0013] The liquid flow control mechanism and the liquid storage tank are located inside the temperature control box;

[0014] The control analyzer is connected to the temperature control box; the control analyzer can control the temperature of the temperature control box.

[0015] In one or more alternative embodiments, the at least three cavities include a first cavity, a second cavity, and a third cavity;

[0016] The at least three delivery pumps include a first delivery pump, a second delivery pump, and a third delivery pump;

[0017] The first cavity is connected to the first delivery pump;

[0018] The second cavity is connected to the second delivery pump;

[0019] The third cavity is connected to the third delivery pump.

[0020] In one or more alternative embodiments, the steady-state flow liquid injection and production simulation device further includes a first flow meter, a second flow meter, a third flow meter, and a fourth flow meter;

[0021] The first flow meter is connected to the first cavity;

[0022] The second flow meter is connected to the second cavity;

[0023] The third flow meter is connected to the third cavity;

[0024] The fourth flow meter is connected to the first flow meter, the second flow meter, the third flow meter, and the core container, respectively.

[0025] The control analyzer is connected to the first flow meter, the second flow meter, the third flow meter, and the fourth flow meter respectively; the control analyzer can obtain the flow monitoring results of the first flow meter, the second flow meter, the third flow meter, and the fourth flow meter.

[0026] In one or more alternative embodiments, the steady-state flow liquid injection and production simulation device further includes a pressure sensor;

[0027] The pressure sensor is positioned between the core container and the fourth flow meter;

[0028] The control analyzer is connected to the pressure sensor; the control analyzer can acquire the pressure monitoring results of the pressure sensor.

[0029] In one or more alternative embodiments, the steady-state flow liquid injection and production simulation device further includes a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, and a sixth control valve;

[0030] The first control valve is located between the first cavity and the core container;

[0031] The second control valve is located between the second cavity and the core container;

[0032] The third control valve is located between the third cavity and the core container;

[0033] The fourth control valve is located between the first cavity and the liquid storage tank;

[0034] The fifth control valve is located between the second cavity and the liquid storage tank;

[0035] The sixth control valve is located between the third cavity and the liquid storage tank.

[0036] In a second aspect, embodiments of the present invention provide a steady-state flow liquid injection and production simulation method, using the steady-state flow liquid injection and production simulation device described in the first aspect, comprising:

[0037] The analyzer controls the operation of each delivery pump to fill the liquid in the storage tank into each cavity, and the liquid in each cavity is alternately circulated and injected into the core according to the set flow rate ratio to simulate steady-state liquid injection.

[0038] The control analyzer controls the operation of each of the delivery pumps to collect the liquid in the core in an alternating cycle according to a set flow rate ratio into each of the cavities, and then fills the liquid in each of the cavities into the storage tank to simulate steady-state liquid extraction.

[0039] In one or more optional embodiments, the step of controlling the operation of each delivery pump via a control analyzer to fill the liquid in the storage tank into each cavity, and alternately circulating the liquid in each cavity into the core according to a set flow rate ratio to simulate steady-state liquid injection, includes:

[0040] The first, second, and third delivery pumps are controlled to fill the liquid in the storage tank into the first, second, and third chambers, respectively.

[0041] The first delivery pump, the second delivery pump, and the third delivery pump are controlled to alternately circulate the liquid in the first cavity, the second cavity, and the third cavity into the core according to a set flow rate ratio;

[0042] When the liquid level in the first cavity is a first preset value, the first delivery pump is controlled to fill the first cavity with liquid from the storage tank.

[0043] When the liquid level in the second cavity is a second preset value, the second delivery pump is controlled to fill the second cavity with liquid from the storage tank.

[0044] When the liquid level in the third chamber reaches a third preset value, the third delivery pump is controlled to fill the third chamber with liquid from the storage tank.

[0045] In one or more optional embodiments, before controlling the first delivery pump, the second delivery pump, and the third delivery pump to fill the first chamber, the second chamber, and the third chamber with liquid from the storage tank, respectively, the method further includes:

[0046] The control analyzer adjusts the temperature inside the temperature control box to the first preset temperature.

[0047] In one or more alternative embodiments, before or after controlling the first delivery pump, the second delivery pump, and the third delivery pump to alternately circulate the liquid in the first cavity, the second cavity, and the third cavity into the core at a set flow rate ratio, the method further includes:

[0048] Based on the pressure monitoring results from the pressure sensor, the operation of the first delivery pump, the second delivery pump, and the third delivery pump is controlled to keep the core inlet pressure within a first preset pressure range.

[0049] In one or more optional embodiments, the step of controlling the operation of each of the delivery pumps via the control analyzer to alternately collect the liquid in the core into each of the cavities according to a set flow rate ratio, and filling the liquid in each of the cavities into the storage tank to simulate steady-state liquid extraction, includes:

[0050] The first, second, and third delivery pumps are controlled to alternately circulate the liquid in the core into the first, second, and third chambers according to a set flow rate ratio;

[0051] When the liquid level in the first cavity is a fourth preset value, the first delivery pump is controlled to fill the liquid in the first cavity into the storage tank.

[0052] When the liquid level in the second cavity reaches the fifth preset value, the second delivery pump is controlled to fill the liquid in the second cavity into the storage tank.

[0053] When the liquid level in the third chamber reaches the sixth preset value, the third delivery pump is controlled to fill the liquid in the third chamber into the storage tank.

[0054] In one or more alternative embodiments, before controlling the first delivery pump, the second delivery pump, and the third delivery pump to alternately circulate the liquid in the core into the first cavity, the second cavity, and the third cavity according to a set flow rate ratio, the method further includes:

[0055] The control analyzer adjusts the temperature inside the temperature control box to the second preset temperature.

[0056] In one or more alternative embodiments, before or after controlling the first delivery pump, the second delivery pump, and the third delivery pump to alternately circulate the liquid in the core into the first cavity, the second cavity, and the third cavity according to a set flow rate ratio, the method further includes:

[0057] Based on the pressure monitoring results from the pressure sensor, the operation of the first delivery pump, the second delivery pump, and the third delivery pump is controlled to keep the core inlet pressure within a second preset pressure range.

[0058] Thirdly, embodiments of the present invention provide an application of the steady-state flow liquid injection and production simulation device described in the first aspect in steady-state flow liquid injection and production simulation.

[0059] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of the present invention include at least the following:

[0060] This invention provides a steady-state flow liquid injection-production simulation device. At least three cavities of a liquid flow control mechanism are connected to a core container. By controlling the operation of at least three corresponding delivery pumps, during the simulated injection process, the liquid in each cavity is alternately circulated into the core according to a set flow rate ratio. During the simulated production process, the liquid in the core is alternately circulated into each cavity according to a set flow rate ratio. This ensures that the liquid in at least three cavities will not be depleted simultaneously during the injection-production simulation, avoiding flow interruption and ensuring steady-state flow liquid injection-production. This allows for low-speed water intrusion experiments during gas reservoir depletion exploitation, simulating the reciprocating migration of formation water during the construction of oil and gas reservoirs and aquifers. This device has significant practical implications for research on the mechanism of underground reservoir conversion into gas storage, analysis of the impact of liquid flow rate on storage construction and injection-production operation, and optimization of gas storage construction and injection-production operation schemes.

[0061] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0062] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0063] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0064] Figure 1 This is a schematic diagram of the steady-state flow liquid injection and extraction simulation device provided in an embodiment of the present invention;

[0065] Figure 2 This is a schematic diagram of the simulated liquid flow rate in the gas storage injection and extraction experiment provided in this embodiment of the invention;

[0066] Figure 3 This is a schematic flowchart of the steady-state flow liquid injection and extraction simulation method provided in this embodiment of the invention.

[0067] In the picture:

[0068] 1 is a liquid flow control mechanism, 111 is a first cavity, 112 is a second cavity, 113 is a third cavity, 121 is a first delivery pump, 122 is a second delivery pump, 123 is a third delivery pump, 131 is a first control valve, 132 is a second control valve, 133 is a third control valve, 134 is a fourth control valve, 135 is a fifth control valve, 136 is a sixth control valve, and 137 is a seventh control valve;

[0069] 2 represents the control analyzer;

[0070] 3 is a liquid storage tank;

[0071] 4 is the core container;

[0072] 51 is the first flow meter, 52 is the second flow meter, 53 is the third flow meter, and 54 is the fourth flow meter;

[0073] 6 is a pressure sensor;

[0074] 7 is the temperature control box. Detailed Implementation

[0075] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0076] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0077] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0078] The inventors discovered that existing experimental devices for simulating the injection and production process of gas storage facilities mostly use liquid flow controllers to control the flow rate of the injection and production liquid. These liquid flow controllers have many internal electronic components, which are easily damaged. Therefore, these flow controllers have many limitations on the types of liquids that can be controlled. Furthermore, the existing flow controllers lack the precision to control the flow rate and pressure, and cannot achieve a steady-state flow state with stable injection and production liquid pressure and flow rate. This makes it difficult to meet the needs of research on the high-pressure range and high-speed injection and production operation mechanism of porous gas storage facilities.

[0079] Based on this, embodiments of the present invention provide a steady-state flow liquid injection and production simulation device, method, and application, which will be described below through specific embodiments.

[0080] Example 1

[0081] This invention provides a steady-state flow liquid injection and production simulation device, with reference to... Figure 1 As shown, it includes a liquid flow control mechanism 1, a control analyzer 2, a liquid storage tank 3, and a core container 4;

[0082] The liquid flow control mechanism 1 includes at least three chambers and at least three delivery pumps; each chamber is connected to a corresponding delivery pump.

[0083] The cavity is connected to the liquid storage tank 3 and the core container 4 respectively;

[0084] Core container 4 is suitable for containing cores;

[0085] The control analyzer 2 is connected to each delivery pump via signal transmission;

[0086] The control analyzer 2 can control the operation of each delivery pump so that, during the simulated injection process, the liquid in the storage tank 3 is filled into each cavity and the liquid in each cavity is alternately circulated into the core according to the set flow rate ratio; and, during the simulated extraction process, the liquid in the core is alternately circulated into each cavity according to the set flow rate ratio and the liquid in each cavity is filled into the storage tank 3.

[0087] In this embodiment of the invention, during the simulated injection process, the controller analyzer 2 controls the operation of each delivery pump. First, the liquid in the storage tank 3 is filled into each cavity until each cavity is full. Then, the controller pumps inject the liquid from each corresponding cavity into the core at different flow rates. When the liquid level in one cavity approaches zero, it is replenished through the storage tank 3, thus ensuring continuous flow during injection. During the simulated extraction process, the controller analyzer 2 controls the operation of each delivery pump. First, the liquid in each cavity is recovered into the storage tank 3, ensuring that each cavity is empty. Then, the controller pumps inject the liquid from the core into each cavity at different flow rates. When the liquid level in one cavity approaches 100%, the liquid in that cavity is transferred into the storage tank 3, thus ensuring continuous flow during extraction. Furthermore, to maintain a constant injection and extraction fluid flow rate, the cavities can be used alternately and cyclically.

[0088] In this embodiment of the invention, reference is made to Figure 1 As shown, the upper part of the cavity is connected to the core container 4 and the liquid storage tank 3 respectively. Each cavity is equipped with a piston. When the piston moves from bottom to top, the cavity discharges liquid; when the piston moves from top to bottom, the cavity draws liquid. Each delivery pump can be a screw pump, and each delivery pump is connected to the corresponding piston and can be linked to the speed and direction of the corresponding piston's movement to control the flow rate of the injected and produced liquids.

[0089] In one specific embodiment, reference is made to Figure 1As shown, the at least three cavities may include a first cavity 111, a second cavity 112, and a third cavity 113; the at least three delivery pumps may include a first delivery pump 121, a second delivery pump 122, and a third delivery pump 123. The first cavity 111 is connected to the first delivery pump 121, the second cavity 112 is connected to the second delivery pump 122, and the third cavity 113 is connected to the third delivery pump 123. The first cavity 111 is connected to the core container 4 and the storage tank 3, respectively. A first control valve 131 is provided between the first cavity 111 and the core container 4, and a fourth control valve 134 is provided between the first cavity 111 and the storage tank 3. The first control valve 131 can control the flow of liquid between the first cavity 111 and the core container 4, and the fourth control valve 134 can control the flow of liquid between the first cavity 111 and the storage tank 3. The second cavity 112 is connected to the core container 4 and the storage tank 3, and a second control valve 132 is provided between the second cavity 112 and the core container 4. A fifth control valve 135 is provided between the second cavity 112 and the storage tank 3. The second control valve 132 can control the opening and closing of the liquid passage between the second cavity 112 and the core container 4, and the fifth control valve 135 can control the opening and closing of the liquid passage between the second cavity 112 and the storage tank 3. The third cavity 113 is connected to the core container 4 and the storage tank 3, and a third control valve 133 is provided between the third cavity 113 and the core container 4. A sixth control valve 136 is provided between the third cavity 113 and the storage tank 3. The third control valve 133 can control the opening and closing of the liquid passage between the third cavity 113 and the core container 4, and the sixth control valve 136 can control the opening and closing of the liquid passage between the third cavity 113 and the storage tank 3.

[0090] In this embodiment of the invention, the core container 4 is used to hold the core, enabling the core to be connected to the device pipeline to simulate the injection and extraction process. By using different core samples, gas storage conditions with different pore characteristics can be simulated.

[0091] In one specific embodiment, reference is made to Figure 1As shown, the steady-state flow liquid injection-production simulation device also includes a first flow meter 51, a second flow meter 52, a third flow meter 53, and a fourth flow meter 54. The first flow meter 51 is connected to the first cavity 111, the second flow meter 52 is connected to the second cavity 112, the third flow meter 53 is connected to the third cavity 113, and the fourth flow meter 54 is connected to the first flow meter 51, the second flow meter 52, the third flow meter 53, and the core container 4, respectively. The first flow meter 51 is used to monitor the liquid flow rate flowing out of or into the first cavity 111 in real time; the second flow meter 52 is used to monitor the liquid flow rate flowing out of or into the second cavity 112 in real time; the third flow meter 53 is used to monitor the liquid flow rate flowing out of or into the third cavity 113 in real time; and the fourth flow meter 54 is used to monitor the liquid flow rate flowing out of or into the core. The control analyzer 2 is connected to the first flow meter 51, the second flow meter 52, the third flow meter 53 and the fourth flow meter 54 respectively. It can acquire the flow monitoring results of the first flow meter 51, the second flow meter 52, the third flow meter 53 and the fourth flow meter 54, and can control the operation of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 according to the acquired flow monitoring results.

[0092] In one specific embodiment, reference is made to Figure 1 As shown, the steady-state flow liquid injection and production simulation device also includes a pressure sensor 6, which is located between the fourth flow meter 54 and the core container 4, and can monitor the pipeline pressure between the fourth flow meter 54 and the core container 4. The control analyzer 2 is connected to the pressure sensor 6, and can obtain the pressure monitoring results of the pressure sensor 6, and can control the operation of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 according to the obtained pressure monitoring results.

[0093] In one specific embodiment, reference is made to Figure 1 As shown, the steady-state flow liquid injection and production simulation device also includes a seventh control valve 137, which is located between the fourth flow meter 54 and the core container 4 and is used to control the flow of the liquid between the fourth flow meter 54 and the core container 4.

[0094] In one specific embodiment, reference is made to Figure 1 As shown, the steady-state flow liquid injection simulation device also includes a temperature control chamber 7. The liquid flow control mechanism 1 and the storage tank 3 are both located inside the temperature control chamber 7, which is capable of heating to maintain the internal temperature. The control analyzer 2 is connected to the temperature control chamber 7 and can control the heating of the chamber.

[0095] The steady-state flow liquid injection-production simulation device provided in this invention controls the operation of at least three corresponding delivery pumps to alternately circulate the liquid in each cavity into the core according to a set flow rate ratio during the simulated injection process, and alternately circulates the liquid in the core into each cavity according to a set flow rate ratio during the simulated production process. This ensures that the liquid in at least three cavities will not be exhausted simultaneously during the injection-production simulation, avoiding flow interruption and ensuring steady-state flow liquid injection-production. Furthermore, the device simulates the liquid temperature through a temperature control chamber 7 and simulates different gas storage pore conditions through different core samples. This enables low-speed water intrusion experiments during the gas reservoir depletion process and simulates the reciprocating migration process of formation water during the construction of gas reservoirs and aquifers. This device has significant practical implications for the study of the mechanism of underground reservoir reconstruction into gas storage, the analysis of the impact of liquid flow rate on storage construction and injection-production operation, and the optimization of gas storage construction and injection-production operation schemes.

[0096] To provide a clearer explanation of the present invention, the implementation process of the embodiments of the present invention will be described in detail below, taking the gas storage injection and production experimental simulation process as an example:

[0097] Based on the gas storage facility construction and injection / production conditions, the temperature range of the gas storage facility is 0~180℃, and the pressure range is 0~70MPa. Therefore, the liquid flow control mechanism 1 has a pressure resistance of 70MPa and controls the liquid flow rate range of 0~100ml / min, while the pressure sensor 6 has a measurement range of 0~70MPa. The first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 have an upper pressure resistance limit of 70MPa and a upper flow rate limit of 100ml / min. The core is maintained under simulated injection / production operating conditions, simulating the internal pressure and temperature of the gas storage facility, wherein the internal pressure of the core increases during injection and decreases during production.

[0098] Experimental preparation stage:

[0099] The control analyzer 2 sets parameters for the injection-production simulation, including ambient temperature, upper limit pressure, lower limit pressure, injected fluid flow rate, and extracted fluid flow rate. Based on these parameters, the control analyzer 2 uses the temperature control chamber 7 to control the temperature (heat) of the equipment inside.

[0100] Experimental simulation phase:

[0101] According to a predetermined procedure, the controller analyzer 2 drives the pistons inside the first chamber 111, second chamber 112, and third chamber 113 via the first delivery pump 121, second delivery pump 122, and third delivery pump 123 in the liquid flow control mechanism 1 to inject or extract liquid from the core at set flow rates. The liquid inside the first chamber 111, second chamber 112, and third chamber 113 is injected or extracted from the core at different flow rates, thus controlling the flow rate of the injected or extracted liquid at the core injection / extraction port. When the pressure inside the core rises to the upper limit pressure threshold or falls to the lower limit pressure threshold for the gas storage facility, injection or extraction stops, at which point the injection is complete.

[0102] The specific operation process of injection simulation may include:

[0103] The discharge flow rates of the first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 are set to Q1, Q2, and Q3, respectively, by the control analyzer 2. Q is defined as the total injection flow rate into the core by the liquid flow control mechanism 1. The relationship between Q1, Q2, Q3, and Q satisfies the following equation:

[0104] Q= Q1+Q2+Q3, formula 1

[0105] Wherein, Q1 is the flow rate of the liquid injected into the core from the first chamber 111, in milliliters per minute (ml / min); Q2 is the flow rate of the liquid injected into the core from the second chamber 112, in milliliters per minute (ml / min); and Q3 is the flow rate of the liquid injected into the core from the third chamber 113, in milliliters per minute (ml / min).

[0106] Before injection begins, the pistons of the first chamber 111, the second chamber 112, and the third chamber 113 are moved to the bottom of the chambers to fill them with liquid (the maximum liquid capacity of the first chamber 111, the second chamber 112, and the third chamber 113 are V1, V2, and V3, respectively).

[0107] The ratio of injection flow rate to total injection flow rate Q during the injection process is controlled by the control analyzer 2. In this embodiment, the initial ratio of Q1, Q2, and Q3 is 60:40:0.

[0108] In the first stage, the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 are controlled by the control analyzer 2 to inject Q1, Q2 and Q3 into the core in a ratio of 60:40:0.

[0109] In the second stage, when the liquid volume in the first chamber 111 is 5% of the maximum liquid volume V1, the ratio of Q1, Q2, and Q3 is adjusted to 0:60:40, the first control valve 131 is closed, the fourth control valve 134 is opened, so that the first chamber 111 is connected to the storage tank 3, the first delivery pump 121 moves the piston of the first chamber 111 downward in conjunction with it, and begins to draw liquid to the maximum liquid volume V1. Then the fourth control valve 134 is closed and the first control valve 131 is opened.

[0110] In the third stage, when the liquid volume in the second chamber 112 is 5% of the maximum liquid volume V2, the ratio of Q1, Q2, and Q3 is adjusted to 40:0:60, the second control valve 132 is closed, and the fifth control valve 135 is opened, so that the second chamber 112 is connected to the storage tank 3. The second delivery pump 122 moves the piston in the second chamber 112 downward to start sucking liquid to the maximum liquid volume V2. The fifth control valve 135 is closed, and the second control valve 132 is opened.

[0111] In the fourth stage, when the liquid level in the third chamber 113 is 5% of the maximum liquid level V3, the ratio of Q1, Q2, and Q3 is adjusted to 60:40:0. The third control valve 133 is closed, and the sixth control valve 136 is opened, so that the third chamber 113 is connected to the storage tank 3. The third delivery pump 123 moves the piston in the third chamber 113 downward to start drawing liquid to the maximum liquid level V3. The sixth control valve 136 is closed, and the third control valve 133 is opened.

[0112] In this cycle, the first cavity 111, the second cavity 112, and the third cavity 113 alternately absorb and inject liquid to ensure a constant and continuous liquid flow output from the liquid flow control mechanism 1, and continuously inject the core in a steady state, thus achieving steady-state injection. The changes in the liquid volume and flow rate during the alternating injection process are shown in Table 2 below.

[0113] Table 1. Changes in liquid volume and flow rate during the injection process.

[0114]

[0115] In this embodiment of the invention, reference is made to Figure 2 As shown, the liquid flow rate remains constant during the injection process, indicating that the liquid flow rate can be kept constant during the injection process by the liquid flow control mechanism 1 for alternating circulation of the core.

[0116] Obviously, the ratio of Q1, Q2, and Q3 is not limited to 60:40:0. It can be reasonably set according to factors such as the capacity of the cavity, as long as the flow rate and velocity can be kept stable without interrupting the flow. No limit is set here.

[0117] The specific operational process of the simulation can include:

[0118] The flow rates of the first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 are set to q1, q2, and q3 respectively by the control analyzer 2, and q is set as the total flow rate of the produced fluid from the core by the liquid flow control mechanism 1. The relationship between q1, q2, q3, and q satisfies the following equation:

[0119] q= q1+q2+q3, formula 2

[0120] Wherein, q1 is the flow rate of the core extract fluid from the first chamber 111, in milliliters per minute (ml / min); q2 is the flow rate of the core extract fluid from the second chamber 112, in milliliters per minute (ml / min); and q3 is the flow rate of the core extract fluid from the third chamber 113, in milliliters per minute (ml / min).

[0121] First, move the pistons of the first chamber 111, the second chamber 112, and the third chamber 113 to the top of the chambers to empty the liquid (the maximum liquid capacity of the first chamber 111, the second chamber 112, and the third chamber 113 are V1, V2, and V3, respectively).

[0122] The ratio of the aspirated flow rate q1, q2, and q3 to the total flow rate q is controlled by the analyzer 2. In this embodiment, the initial ratio of q1, q2, and q3 is 60:40:0.

[0123] In the first stage, the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 are controlled by the control analyzer 2 to inject q1, q2 and q3 from the core at a ratio of 60:40:0.

[0124] In the second stage, when the liquid volume in the first chamber 111 is 95% of the maximum liquid volume V1, the ratio of q1, q2, and q3 is adjusted to 0:60:40, the first control valve 131 is closed, and the third control valve 133 is opened, so that the first chamber 111 is connected to the storage tank 3. The first delivery pump 121 moves the piston in the first chamber 111 upward, and the first chamber 111 begins to discharge liquid until the liquid volume V1 is 0. Then, the third control valve 133 is closed and the first control valve 131 is opened.

[0125] In the third stage, when the liquid level in the second chamber 112 is 95% of the maximum liquid level V2, the ratio of q1, q2, and q3 is adjusted to 40:0:60. The second control valve 132 is closed, and the fourth control valve 134 is opened, so that the second chamber 112 is connected to the storage tank 3. The second delivery pump 122 moves the piston in the second chamber 112 upward, and the second chamber 112 begins to drain liquid until the liquid level V2 is zero. Then, the fourth control valve 134 is closed, and the second control valve 132 is opened.

[0126] In the fourth stage, when the liquid level in the third chamber 113 is 95% of the maximum liquid level V3, the ratio of q1, q2, and q3 is adjusted to 60:40:0. The third control valve 133 is closed, and the sixth control valve 136 is opened, so that the third chamber 113 is connected to the storage tank 3. The third delivery pump 123 moves the piston in the third chamber 113 upward, and the third chamber 113 begins to drain liquid until the liquid level V3 is zero. Then, the sixth control valve 136 is closed, and the third control valve 133 is opened.

[0127] In this cycle, the first chamber 111, the second chamber 112, and the third chamber 113 alternately discharge and collect liquid to ensure that the liquid flow control mechanism 1 continuously collects liquid with a constant flow. The liquid is continuously and steadily extracted from the core, that is, steady-state flow extraction is achieved. The changes in the amount of liquid stored and the flow rate during the alternating extraction process are shown in Table 2 below.

[0128] Table 2. Changes in liquid volume and flow rate during the extraction process.

[0129]

[0130] In this embodiment of the invention, reference is made to Figure 2 As shown, the liquid flow rate remains constant during the extraction process, indicating that the liquid flow rate can be kept constant during the extraction process by the liquid flow control mechanism 1, which performs alternating circulation of liquid collection from the core.

[0131] Obviously, the ratio of q1, q2, and q3 is not limited to 60:40:0. It can be reasonably set according to factors such as the capacity of the cavity, as long as the flow rate and velocity can be kept stable without interrupting the flow. No limit is set here.

[0132] The steady-state liquid injection and production simulation device provided in this embodiment of the invention achieves stable output or intake of steady-state liquid by controlling the liquid flow control mechanism 1 through monitoring, analysis and control of the control analyzer 2. It is applicable to different injection and production liquid flow ranges and different injection and production pressure ranges, and can solve the problem of simulating liquid flow at different flow rates in indoor experiments of gas storage facilities. Thus, it can carry out physical simulation of gas storage facility construction and periodic injection and production operation, analyze the pore space utilization characteristics and change law during the construction and injection and production operation of gas storage facilities, and study the influence of liquid flow rate on storage capacity parameters during the injection and production process.

[0133] Example 2

[0134] Based on the same inventive concept, this invention also provides a steady-state flow liquid injection and production simulation method, using the steady-state flow liquid injection and production simulation device described in Embodiment 1, with reference to... Figure 3 As shown, it includes:

[0135] S101: By controlling the operation of each delivery pump through the control analyzer 2, the liquid in the storage tank 3 is filled into each cavity, and the liquid in each cavity is alternately circulated and injected into the core according to the set flow rate ratio to simulate steady-state liquid injection.

[0136] S102: By controlling the operation of each delivery pump through the controller analyzer 2, the liquid in the core is alternately collected into each cavity according to the set flow rate ratio, and the liquid in each cavity is filled into the storage tank 3 to simulate steady-state liquid extraction.

[0137] In this embodiment of the invention, the steady-state flow liquid injection and production simulation method corresponds to the steady-state flow liquid injection and production simulation device described in Embodiment 1. Its specific implementation process can refer to the process of using the steady-state flow liquid injection and production simulation device to realize steady-state flow liquid injection and production simulation in Embodiment 1. The repeated parts will not be described again here.

[0138] In this embodiment of the invention, the operation of each delivery pump is controlled by the control analyzer 2 to fill the liquid in the storage tank 3 into each cavity, and the liquid in each cavity is alternately circulated and injected into the core according to a set flow rate ratio to simulate steady-state liquid injection. This may include:

[0139] The first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 are controlled to fill the liquid in the storage tank 3 into the first chamber 111, the second chamber 112 and the third chamber 113 respectively;

[0140] The first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 are controlled to alternately circulate the liquid in the first chamber 111, the second chamber 112 and the third chamber 113 into the core according to the set flow rate ratio;

[0141] When the liquid level in the first chamber 111 is the first preset value, the first delivery pump 121 is controlled to fill the first chamber 111 with liquid from the storage tank 3.

[0142] When the liquid level in the second chamber 112 is the second preset value, the second delivery pump 122 is controlled to fill the liquid in the storage tank 3 into the second chamber 112.

[0143] When the liquid level in the third chamber 113 reaches the third preset value, the third delivery pump 123 is controlled to fill the third chamber 113 with liquid from the storage tank 3.

[0144] In this embodiment of the invention, before controlling the first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 to fill the liquid in the storage tank 3 into the first cavity 111, the second cavity 112, and the third cavity 113 respectively, the following may be included:

[0145] The temperature inside the temperature control box 7 is adjusted to the first preset temperature by the control analyzer 2.

[0146] In this embodiment of the invention, before or after controlling the first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 to alternately circulate the liquid in the first chamber 111, the second chamber 112, and the third chamber 113 into the core at a set flow rate ratio, the following may also be included:

[0147] Based on the pressure monitoring results of pressure sensor 6, the operation of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 is controlled to keep the core inlet pressure within the first preset pressure range.

[0148] In this embodiment of the invention, the analyzer 2 controls the operation of each delivery pump to alternately collect the liquid in the core into each cavity according to a set flow rate ratio, and then fills the liquid in each cavity into the storage tank 3 to simulate steady-state liquid extraction, including:

[0149] The first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 are controlled to alternately circulate the liquid in the core into the first cavity 111, the second cavity 112 and the third cavity 113 according to the set flow rate ratio;

[0150] When the liquid level in the first chamber 111 is the fourth preset value, the first delivery pump 121 is controlled to fill the liquid in the first chamber 111 into the storage tank 3.

[0151] When the liquid level in the second chamber 112 reaches the fifth preset value, the second delivery pump 122 is controlled to fill the liquid in the second chamber 112 into the storage tank 3.

[0152] When the liquid level in the third chamber 113 reaches the sixth preset value, the third delivery pump 123 is controlled to fill the liquid in the third chamber 113 into the storage tank 3.

[0153] In this embodiment of the invention, before controlling the first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 to alternately circulate the liquid in the core into the first cavity 111, the second cavity 112, and the third cavity 113 according to a set flow rate ratio, the following may also be included:

[0154] The temperature inside the temperature control box 7 is adjusted to the second preset temperature by the control analyzer 2.

[0155] In this embodiment of the invention, before or after controlling the first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 to alternately circulate the liquid in the core into the first cavity 111, the second cavity 112, and the third cavity 113 according to a set flow rate ratio, the following may also be included:

[0156] Based on the pressure monitoring results of pressure sensor 6, the operation of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 is controlled to keep the core inlet pressure within the second preset pressure range.

[0157] Example 3

[0158] Based on the same inventive concept, this invention also provides an application of the steady-state flow liquid injection and production simulation device described in Embodiment 1 in steady-state flow liquid injection and production simulation.

[0159] In this embodiment of the invention, the specific process of using the steady-state flow liquid injection and production simulation device to realize steady-state flow liquid injection and production simulation can refer to the implementation process of using the steady-state flow liquid injection and production simulation device to realize steady-state flow liquid injection and production simulation in the above embodiment one. The repeated parts will not be described again here.

[0160] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. This disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A steady-state flow liquid injection and production simulation method, characterized in that, A steady-state flow liquid injection and production simulation device is used; the steady-state flow liquid injection and production simulation device includes a liquid flow control mechanism, a control analyzer, a storage tank, a core container, and a temperature control box; The liquid flow control mechanism includes at least three chambers and at least three delivery pumps; each chamber is connected to a corresponding delivery pump. The cavity is connected to the liquid storage tank and the core container respectively; The core container is adapted to hold the core; The control analyzer is connected to each of the delivery pumps via signals. The control analyzer can control the operation of each of the delivery pumps to fill the liquid in the storage tank into each of the cavities during the simulated injection process, and to alternately circulate the liquid in each cavity into the core according to a set flow rate ratio. When the liquid volume in one cavity reaches 5% of the maximum liquid volume, the flow rate ratio of each cavity is adjusted, the cavity is connected to the storage tank, and the liquid in the storage tank is filled into the cavity through the corresponding delivery pump until the maximum liquid volume is reached, so as to ensure continuous flow during the injection process. During the simulated extraction process, the liquid in the core is alternately collected into each of the cavities according to a set flow rate ratio, and the liquid in each cavity is filled into the storage tank. When the liquid volume in one cavity reaches 95% of the maximum liquid volume, the flow rate ratio of each cavity is adjusted, the cavity is connected to the storage tank, and the liquid in the cavity is discharged to the storage tank through the corresponding delivery pump until the liquid volume is zero, so as to ensure continuous flow during the extraction process. The steady-state flow liquid injection and production simulation method includes: The analyzer controls the operation of each delivery pump to fill the liquid in the storage tank into each cavity, and the liquid in each cavity is alternately circulated and injected into the core according to the set flow rate ratio to simulate steady-state liquid injection. The control analyzer controls the operation of each of the delivery pumps to collect the liquid in the core in an alternating cycle according to a set flow rate ratio into each of the cavities, and then fills the liquid in each of the cavities into the storage tank to simulate steady-state liquid extraction.

2. The steady-state flow liquid injection and production simulation method according to claim 1, characterized in that, The liquid flow control mechanism and the liquid storage tank are located inside the temperature control box; The control analyzer is connected to the temperature control box; the control analyzer can control the temperature of the temperature control box.

3. The steady-state flow liquid injection and production simulation method according to claim 1, characterized in that, The at least three cavities include a first cavity, a second cavity, and a third cavity; The at least three delivery pumps include a first delivery pump, a second delivery pump, and a third delivery pump; The first cavity is connected to the first delivery pump; The second cavity is connected to the second delivery pump; The third cavity is connected to the third delivery pump.

4. The steady-state flow liquid injection and production simulation method according to claim 3, characterized in that, The steady-state flow liquid injection and production simulation device also includes a first flow meter, a second flow meter, a third flow meter, and a fourth flow meter; The first flow meter is connected to the first cavity; The second flow meter is connected to the second cavity; The third flow meter is connected to the third cavity; The fourth flow meter is connected to the first flow meter, the second flow meter, the third flow meter, and the core container, respectively. The control analyzer is connected to the first flow meter, the second flow meter, the third flow meter, and the fourth flow meter respectively; the control analyzer can obtain the flow monitoring results of the first flow meter, the second flow meter, the third flow meter, and the fourth flow meter.

5. The steady-state flow liquid injection and production simulation method according to claim 4, characterized in that, The steady-state flow liquid injection and production simulation device also includes a pressure sensor; The pressure sensor is positioned between the core container and the fourth flow meter; The control analyzer is connected to the pressure sensor; the control analyzer can acquire the pressure monitoring results of the pressure sensor.

6. The steady-state flow liquid injection and production simulation method according to claim 4, characterized in that, The steady-state flow liquid injection and production simulation device also includes a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, and a sixth control valve; The first control valve is located between the first cavity and the core container; The second control valve is located between the second cavity and the core container; The third control valve is located between the third cavity and the core container; The fourth control valve is located between the first cavity and the liquid storage tank; The fifth control valve is located between the second cavity and the liquid storage tank; The sixth control valve is located between the third cavity and the liquid storage tank.

7. The steady-state flow liquid injection and production simulation method according to claim 1, characterized in that, The process involves controlling the operation of each delivery pump via a control analyzer to fill the liquid in the storage tank into each cavity, and then alternately circulating the liquid from each cavity into the core according to a set flow rate ratio to simulate steady-state liquid injection. This includes: The first, second, and third delivery pumps are controlled to fill the liquid in the storage tank into the first, second, and third chambers, respectively. The first delivery pump, the second delivery pump, and the third delivery pump are controlled to alternately circulate the liquid in the first cavity, the second cavity, and the third cavity into the core according to a set flow rate ratio; When the liquid level in the first cavity is a first preset value, the first delivery pump is controlled to fill the first cavity with liquid from the storage tank. When the liquid level in the second cavity is a second preset value, the second delivery pump is controlled to fill the second cavity with liquid from the storage tank. When the liquid level in the third chamber reaches a third preset value, the third delivery pump is controlled to fill the third chamber with liquid from the storage tank.

8. The steady-state flow liquid injection and production simulation method according to claim 7, characterized in that, Before controlling the first, second, and third transfer pumps to fill the first, second, and third chambers with liquid from the storage tank, respectively, the process also includes: The control analyzer adjusts the temperature inside the temperature control box to the first preset temperature.

9. The steady-state flow liquid injection and production simulation method according to claim 7, characterized in that, Before or after controlling the first, second, and third delivery pumps to alternately circulate the liquid in the first, second, and third cavities into the core at a set flow rate ratio, the method further includes: Based on the pressure monitoring results from the pressure sensor, the operation of the first delivery pump, the second delivery pump, and the third delivery pump is controlled to keep the core inlet pressure within a first preset pressure range.

10. The steady-state flow liquid injection and production simulation method according to claim 1, characterized in that, The process of controlling the operation of each of the delivery pumps via the control analyzer to alternately collect the liquid from the core into each of the cavities according to a set flow rate ratio, and filling the liquid in each of the cavities into the storage tank to simulate steady-state liquid extraction, includes: The first, second, and third delivery pumps are controlled to alternately circulate the liquid in the core into the first, second, and third chambers according to a set flow rate ratio; When the liquid level in the first cavity is a fourth preset value, the first delivery pump is controlled to fill the liquid in the first cavity into the storage tank. When the liquid level in the second cavity reaches the fifth preset value, the second delivery pump is controlled to fill the liquid in the second cavity into the storage tank. When the liquid level in the third chamber reaches the sixth preset value, the third delivery pump is controlled to fill the liquid in the third chamber into the storage tank.

11. The steady-state flow liquid injection and production simulation method according to claim 10, characterized in that, Before controlling the first, second, and third delivery pumps to alternately circulate the liquid in the core into the first, second, and third cavities according to a set flow rate ratio, the method further includes: The control analyzer adjusts the temperature inside the temperature control box to the second preset temperature.

12. The steady-state flow liquid injection and production simulation method according to claim 10, characterized in that, Before or after controlling the first, second, and third delivery pumps to alternately circulate the liquid in the core into the first, second, and third cavities according to a set flow rate ratio, the method further includes: Based on the pressure monitoring results from the pressure sensor, the operation of the first delivery pump, the second delivery pump, and the third delivery pump is controlled to keep the core inlet pressure within a second preset pressure range.

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