Steady flow liquid injection and production simulation device and method and application

Abstract

The invention discloses a steady-state flow liquid injection and production simulation device and method and application. The device comprises a liquid flow control mechanism, a control analyzer, a liquid storage tank and a rock core container, the flow control mechanism comprises at least three cavities and at least three delivery pumps; each cavity is connected with a corresponding delivery pump; the cavity is respectively connected with the liquid storage tank and the rock core container; the core container is suitable for containing cores; the control analyzer is in signal connection with each conveying pump; the control analyzer can control the actions of the delivery pumps so as to respectively fill the liquid in the liquid storage tank into the cavities in the simulated injection process, and alternately and circularly inject the liquid in the cavities into the rock core according to a set flow ratio; and in the simulated extraction process, liquid in the rock core is alternately and circularly collected into all the cavities according to the set flow proportion, and the liquid in all the cavities is filled into the liquid storage tank, so that the stored liquid in at least three cavities cannot be used up at the same time in the injection and extraction simulation process, cutoff is avoided, and steady-state flow liquid injection and extraction are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas storage, and in particular to a steady-state flow liquid injection and production simulation device, method and application. Background Art

[0002] Underground gas storage is mainly a porous gas storage converted from depleted oil and gas reservoirs. Therefore, before the construction of the gas storage, it is necessary to fully understand the original physical properties of the oil and gas reservoirs, study the injection and production operation mechanism of the gas storage converted from oil and gas reservoirs and its main influencing factors, especially the impact of the injection and production liquid flow rates on the gas storage capacity parameter indicators during the injection and production operation, so as to guide the optimization of the injection and production operation plan of the gas storage.

[0003] Underground gas storages mainly include porous gas storages. The Dazhangtuo gas storage, which has the longest operation time in China, was put into operation in 2002, but its construction and operation experience is still lacking. From the operation of the Dagang Banqiao underground gas storage group in multiple injection and production cycles, the high-speed and high-flow injection and production, water invasion and other effects in the operation of the gas storage have a more obvious impact on the volume utilization of gas-bearing pores. In addition, the reservoir physical properties are medium and the heterogeneity is strong. Although it has experienced 8 to 9 complete injection and production cycles, the expansion speed of the gas storage is slow and far from the designed working gas scale. Obviously, the reconstruction of underground gas storage using depleted oil and gas reservoirs has its own particularity and complexity in the formation mechanism of storage capacity and the law of changes in injection and production capacity. Research in this area is still relatively weak and needs to be further strengthened.

[0004] In the field of porous gas storage injection and production experiments, the research on the injection and production simulation system of depleted oil and gas reservoir gas storage has been carried out, mainly using the simulation device of gas storage gas injection and production process to study the injection and production mechanism of reservoir construction, but there are deficiencies in the liquid flow control device in the gas storage simulation experiment. During the injection and production operation of porous gas storage, it is affected by multiple factors such as injection and production speed, operating pressure range and water invasion. The conventional oil and gas reservoir development experimental method cannot simulate the reciprocating high-speed injection and production operation law in the operation of gas storage and its impact on the operation efficiency of reservoir construction. Summary of the invention

[0005] In order to enrich the product types of steady-state flow liquid injection and production simulation devices, increase the selection space of steady-state flow liquid injection and production simulation methods, and better simulate the injection and production conditions of gas storage reservoirs, an embodiment of the present invention provides a steady-state flow liquid injection and production simulation device, method and application.

[0006] In a first aspect, an embodiment of the present invention provides 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 flow control mechanism comprises at least three cavities and at least three delivery pumps; each of the cavities 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 suitable for accommodating the core;

[0010] The control analyzer is respectively connected to each of the delivery pumps by signal;

[0011] The control analyzer can control the action of each of the delivery pumps so that during the simulated injection process, the liquid in the liquid storage tank is respectively filled into each of the cavities, and the liquid in each of the cavities is alternately circulated and injected into the core at a set flow rate ratio; and during the simulated production process, the liquid in the core is alternately circulated and collected into each of the cavities at a set flow rate ratio, and the liquid in each of the cavities is filled into the liquid storage tank.

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

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

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

[0015] In one or some optional 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 some optional 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 respectively connected to the first flow meter, the second flow meter, the third flow meter and the core container;

[0025] The control analyzer is respectively connected to the first flow meter, the second flow meter, the third flow meter and the fourth flow meter by signals; 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 some optional embodiments, the steady-state flow liquid injection and production simulation device further includes a pressure sensor;

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

[0028] The control analyzer signal is connected to the pressure sensor; the control analyzer can obtain the pressure monitoring result of the pressure sensor.

[0029] In one or some optional 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 disposed between the first cavity and the core container;

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

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

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

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

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

[0036] In a second aspect, an embodiment of the present invention provides a method for simulating the injection and production of a steady-state liquid, using the steady-state liquid injection and production simulation device described in the first aspect, comprising:

[0037] The analyzer is used to control the actions of the delivery pumps, so that the liquid in the liquid storage tank is respectively filled into each cavity, and the liquid in each cavity is alternately cyclically injected into the core according to a set flow rate ratio to simulate steady-state liquid injection;

[0038] The control analyzer controls the action of each delivery pump, collects the liquid in the core into each cavity in an alternate cycle according to a set flow rate ratio, and fills the liquid in each cavity into the liquid storage tank to simulate steady-state flow liquid production.

[0039] In one or some optional embodiments, the control analyzer controls the actions of the delivery pumps to fill the liquid in the liquid storage tank into each cavity respectively, and alternately and cyclically injects the liquid in each cavity into the core according to a set flow rate ratio to simulate steady-state liquid injection, including:

[0040] Controlling the first delivery pump, the second delivery pump and the third delivery pump to respectively fill the liquid in the liquid storage tank into the first cavity, the second cavity and the third cavity;

[0041] Controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject the liquids in the first cavity, the second cavity and the third cavity into the core according to a set flow rate ratio;

[0042] When the amount of liquid stored in the first cavity reaches a first preset value, controlling the first delivery pump to fill the liquid in the liquid storage tank into the first cavity;

[0043] When the amount of liquid stored in the second cavity reaches a second preset value, controlling the second delivery pump to fill the liquid in the liquid storage tank into the second cavity;

[0044] When the amount of liquid stored in the third cavity reaches a third preset value, the third delivery pump is controlled to fill the liquid in the liquid storage tank into the third cavity.

[0045] In one or some optional embodiments, before controlling the first delivery pump, the second delivery pump and the third delivery pump to respectively fill the liquid in the liquid storage tank into the first cavity, the second cavity and the third cavity, the method further includes:

[0046] The temperature in the temperature control box is adjusted to a first preset temperature by the control analyzer.

[0047] In one or some optional embodiments, before or after controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately circulate the liquids in the first cavity, the second cavity and the third cavity into the core according to a set flow rate ratio, the process further includes:

[0048] According to the pressure monitoring result of the pressure sensor, the actions of the first delivery pump, the second delivery pump and the third delivery pump are controlled to make the core inlet pressure within a first preset pressure range.

[0049] In one or some optional embodiments, the control analyzer controls the action of each of the delivery pumps to collect the liquid in the core into each of the cavities in an alternating cycle according to a set flow rate ratio, and fills the liquid in each of the cavities into the liquid storage tank to simulate steady-state liquid production, including:

[0050] Controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject the liquid in the core into the first cavity, the second cavity and the third cavity according to a set flow rate ratio;

[0051] When the amount of liquid stored in the first cavity reaches a fourth preset value, controlling the first delivery pump to fill the liquid in the first cavity into the liquid storage tank;

[0052] When the amount of liquid stored in the second cavity reaches a fifth preset value, controlling the second delivery pump to charge the liquid in the second cavity into the liquid storage tank;

[0053] When the amount of liquid stored in the third cavity reaches a sixth preset value, the third delivery pump is controlled to fill the liquid in the third cavity into the liquid storage tank.

[0054] In one or some optional embodiments, before controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject 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 temperature in the temperature control box is adjusted to a second preset temperature by the control analyzer.

[0056] In one or some optional embodiments, before or after controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject 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] According to the pressure monitoring result of the pressure sensor, the actions of the first delivery pump, the second delivery pump and the third delivery pump are controlled to make the core inlet pressure within a second preset pressure range.

[0058] In a third aspect, an embodiment of the present invention provides 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 technical solution provided in the embodiments of the present invention include at least:

[0060] In an embodiment of the present invention, a steady-state flow liquid injection and production simulation device is provided, in which at least three cavities of a liquid flow control mechanism are connected to core containers respectively, and by controlling the actions of at least three corresponding delivery pumps, the liquids in each of the cavities are alternately circulated and injected into the core at a set flow ratio during the simulated injection process, and the liquid in the core is alternately circulated and collected into each of the cavities at a set flow ratio during the simulated production process, so that the liquid stored in at least three cavities will not be exhausted at the same time during the injection and production simulation process, avoiding the flow interruption phenomenon, ensuring the realization of steady-state flow liquid injection and production, so that low-speed water intrusion experiments in the process of gas reservoir depletion production can be carried out, and the reciprocating migration process of formation water in the process of reservoir construction in oil and gas reservoirs, aquifers, etc. is simulated, which has important practical significance for the study of the mechanism of underground reservoir reconstruction into gas storage, the analysis of the influence of liquid flow on reservoir construction and injection and production operation, and the optimization of gas storage construction and injection and production operation schemes.

[0061] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0062] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

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

[0065] Figure 2 A schematic diagram of a simulated liquid flow rate in a gas storage injection and production experiment provided in an embodiment of the present invention;

[0066] Figure 3 It is a schematic flow chart of the steady-state flow liquid injection and production simulation method provided in an embodiment of the present invention.

[0067] In the figure:

[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 is the control analyzer;

[0070] 3 is a liquid storage tank;

[0071] 4 is a core container;

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

[0073] 6 is a pressure sensor;

[0074] 7 is a temperature control box. DETAILED DESCRIPTION

[0075] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0076] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "far", "near", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] The inventors have discovered that the liquid flow controllers used in the existing experimental devices simulating the injection and production process of gas storage reservoirs are mostly used to control the injection and production liquid flow. Such liquid flow controllers have abundant internal electronic components that are easily damaged, and thus such flow controllers have many restrictions on the types of controlled liquids. Furthermore, the existing flow controllers have insufficient control accuracy over flow and pressure, and are unable to achieve a steady-state flow state with stable pressure and flow of the injection and production liquid, making it difficult to meet the needs of research on large pressure range and high-speed injection and production operation mechanisms of porous gas storage reservoirs.

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

[0080] Embodiment 1

[0081] The embodiment of the present invention provides a steady-state flow liquid injection and production simulation device, referring 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 flow control mechanism includes at least three cavities and at least three delivery pumps; each cavity 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] The core container 4 is suitable for accommodating the core;

[0085] The control analyzer 2 is respectively connected to each delivery pump with signals;

[0086] The control analyzer 2 can control the action of each delivery pump so that during the simulated injection process, the liquid in the liquid storage tank 3 is respectively filled into each cavity, and the liquid in each cavity is alternately circulated and injected into the core at a set flow rate ratio; and, during the simulated production process, the liquid in the core is alternately circulated and collected into each cavity at a set flow rate ratio, and the liquid in each cavity is filled into the liquid storage tank 3.

[0087] In the embodiment of the present invention, during the simulated injection process, the control analyzer 2 controls the action of each delivery pump, firstly fills the liquid in the liquid storage tank 3 into each cavity until each cavity is full of liquid, and then controls each delivery pump to inject the liquid in each corresponding cavity into the core at different flow rates. When the liquid storage in one of the cavities is close to zero, it is replenished through the liquid storage tank 3, thereby ensuring continuous flow during the injection process. During the simulated extraction process, the control analyzer 2 controls the action of each delivery pump, firstly recovers the liquid in each cavity into the liquid storage tank 3, ensuring that each cavity is empty, and then controls each delivery pump to inject the liquid in the core into each cavity at different flow rates. When the liquid storage in one of the cavities is close to 100%, the liquid in the cavity is passed into the liquid storage tank 3, thereby ensuring continuous flow during the extraction process. Further, in order to keep the flow rate of the injection and extraction liquid constant, each cavity can be used alternately and cyclically.

[0088] In the embodiment of the present invention, refer 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, and a piston is arranged in each cavity. The piston moves from bottom to top to discharge the cavity, and the piston moves from top to bottom to absorb the cavity. Each delivery pump can be a screw pump, and each delivery pump is connected to the corresponding piston respectively, and can be linked to the speed and direction of the corresponding piston movement to realize the control of the flow rate of the core injection and extraction liquid.

[0089] In a specific embodiment, referring to Figure 1As shown, the at least three chambers may include a first chamber 111, a second chamber 112 and a third chamber 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 chamber 111 is connected to the first delivery pump 121, the second chamber 112 is connected to the second delivery pump 122, and the third chamber 113 is connected to the third delivery pump 123. The first chamber 111 is connected to the core container 4 and the liquid storage tank 3, respectively, and a first control valve 131 is provided between the first chamber 111 and the core container 4, and a fourth control valve 134 is provided between the first chamber 111 and the liquid storage tank 3. The first control valve 131 can control the on-off of the liquid path between the first chamber 111 and the core container 4, and the fourth control valve 134 can control the on-off of the liquid path between the first chamber 111 and the liquid storage tank 3. The second cavity 112 is connected to the core container 4 and the liquid storage tank 3, and a second control valve 132 is provided between the second cavity 112 and the core container 4, and a fifth control valve 135 is provided between the second cavity 112 and the liquid storage tank 3. The second control valve 132 can control the on-off of the liquid path between the second cavity 112 and the core container 4, and the fifth control valve 135 can control the on-off of the liquid path between the second cavity 112 and the liquid storage tank 3. The third cavity 113 is connected to the core container 4 and the liquid storage tank 3, and a third control valve 133 is provided between the third cavity 113 and the core container 4, and a sixth control valve 136 is provided between the third cavity 113 and the liquid storage tank 3. The third control valve 133 can control the on-off of the liquid path between the third cavity 113 and the core container 4, and the sixth control valve 136 can control the on-off of the liquid path between the third cavity 113 and the liquid storage tank 3.

[0090] In the embodiment of the present invention, the core container 4 is used to contain the core, so that the core can be connected to the device pipeline to realize the simulation process of injection and extraction. By using different core samples, gas storage conditions with different pore characteristics can be simulated.

[0091] In a specific embodiment, referring to Figure 1As shown, the steady-state flow liquid injection and 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 respectively connected to the first flow meter 51, the second flow meter 52, the third flow meter 53 and the core container 4. The first flow meter 51 is used to monitor the flow rate of liquid flowing out of or filling into the first cavity 111 in real time; the second flow meter 52 is used to monitor the flow rate of liquid flowing out of or filling into the second cavity 112 in real time; the third flow meter 53 is used to monitor the flow rate of liquid flowing out of or filling into the third cavity 113 in real time; and the fourth flow meter 54 is used to monitor the flow rate of liquid flowing out of or filling into the core. The control analyzer 2 is respectively connected to the first flow meter 51, the second flow meter 52, the third flow meter 53 and the fourth flow meter 54 by signals, and can obtain 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 obtained flow monitoring results.

[0092] In a specific embodiment, referring to Figure 1 As shown, the steady-state flow liquid injection and production simulation device further includes a pressure sensor 6, which is disposed 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 by a signal, and can obtain the pressure monitoring result of the pressure sensor 6, and can control the actions of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 according to the obtained pressure monitoring result.

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

[0094] In a specific embodiment, referring to Figure 1 As shown, the steady-state flow liquid injection and production simulation device also includes a temperature control box 7. The liquid flow control mechanism 1 and the liquid storage tank 3 are both arranged in the temperature control box 7, and the temperature control box 7 can be heated to maintain the temperature in the box. The control analyzer 2 is connected to the temperature control box 7 and can control the temperature control box 7 to heat up.

[0095] The steady-state flow liquid injection and production simulation device provided in the embodiment of the present invention controls the actions of at least three corresponding delivery pumps, and in the simulated injection process, the liquid in each cavity is alternately circulated and injected into the core according to a set flow rate ratio, and in the simulated production process, the liquid in the core is alternately circulated and collected into each cavity according to a set flow rate ratio, so that the liquid stored in at least three cavities will not be exhausted at the same time during the injection and production simulation process, thereby avoiding the occurrence of flow interruption and ensuring the realization of steady-state flow liquid injection and production; and, by simulating the liquid temperature through the temperature control box 7, and simulating different gas storage reservoir pore conditions through different core samples, it is possible to carry out low-speed water intrusion experiments in the process of gas reservoir depletion production, and simulate the reciprocating migration process of formation water in the process of reservoir construction in oil and gas reservoirs, aquifers, etc., which has important practical significance for the study of the mechanism of underground reservoir reconstruction into gas storage, the analysis of the influence of liquid flow on reservoir construction and injection and production operation, and the optimization of gas storage construction and injection and production operation schemes.

[0096] In order to explain the present invention more clearly, taking the gas storage reservoir injection and production experiment simulation process as an example, the implementation process of the embodiment of the present invention is described in detail as follows:

[0097] According to the construction and injection and production conditions of the gas storage, the temperature range of the gas storage is 0-180°C and the pressure range is 0-70MPa. Therefore, the pressure resistance of the liquid flow control mechanism 1 is 70MPa, the control liquid flow range is 0-100ml / min, and the measurement range of the pressure sensor 6 is 0-70MPa. The upper limit of the pressure resistance of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 is 70MPa, and the upper limit of the flow rate is 100ml / min. The core maintains the injection and production simulation operation conditions, that is, simulates the internal pressure and temperature of the gas storage, wherein the internal pressure of the core increases during injection and decreases during production.

[0098] Experimental preparation stage:

[0099] The experimental environment temperature, injection and production operation upper and lower pressure limits, injection and production operation lower pressure limits, injection and production flow rate, and production and production flow rate parameters of the injection and production simulation are set by the control analyzer 2. The control analyzer 2 controls the temperature (heats) of the equipment in the box through the temperature control box 7 according to the above parameters.

[0100] Experimental simulation stage:

[0101] According to the predetermined method program, the control analyzer 2 controls the first delivery pump 121, the second delivery pump 122, and the third delivery pump 123 in the liquid flow control mechanism 1 to drive the pistons inside the first cavity 111, the second cavity 112, and the third cavity 113 to inject or extract the liquid in the cavity into or from the core according to the set flow ratio. The liquid inside the first cavity 111, the second cavity 112, and the third cavity 113 is injected into or extracted from the core at different flow rates, respectively, to achieve control of the flow rate of liquid injected or extracted from the core injection and extraction port. When the internal pressure of the core rises to the upper pressure threshold of the gas storage operation or drops to the lower pressure threshold, the injection or extraction is stopped, and the injection is completed at this time.

[0102] The specific operation process of injection simulation can 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, and Q is set to be the total injection flow rate injected into the core by the liquid flow control mechanism 1. The relationship between Q1, Q2, Q3 and Q satisfies the following formula:

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

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

[0106] Before starting the injection, first move the pistons of the first cavity 111, the second cavity 112, and the third cavity 113 to the bottom of the cavity so that the cavity is filled with liquid (the maximum liquid storage volume of the first cavity 111, the second cavity 112, and the third cavity 113 are V1, V2, and V3 respectively);

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

[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 at a ratio of 60:40:0;

[0109] In the second stage, when the liquid storage volume of the first cavity 111 is 5% of the maximum liquid storage 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, the first cavity 111 is connected with the liquid storage tank 3, the first delivery pump 121 links the piston of the first cavity 111 to move downward, and starts to absorb liquid to the maximum liquid storage volume V1, the fourth control valve 134 is closed, and the first control valve 131 is opened;

[0110] In the third stage, when the liquid storage volume of the second cavity 112 is 5% of the maximum liquid storage volume V2, the ratio of Q1, Q2, and Q3 is adjusted to 40:0:60, the second control valve 132 is closed, the fifth control valve 135 is opened, the second cavity 112 is connected with the liquid storage tank 3, the second delivery pump 122 is linked to the piston in the second cavity 112 to move downward, and the liquid is sucked to the maximum liquid storage 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 storage volume of the third cavity 113 is 5% of the maximum liquid storage volume V3, the ratio of Q1, Q2, and Q3 is adjusted to 60:40:0, the third control valve 133 is closed, the sixth control valve 136 is opened, the third cavity 113 is connected with the liquid storage tank 3, the third delivery pump 123 links the piston in the third cavity 113 to move downward, and starts to absorb liquid to the maximum liquid storage volume 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 cycle between liquid suction and liquid injection to ensure that a constant continuous liquid flow is output from the liquid flow control mechanism 1 and continuously and steadily injected into the core, that is, steady-state flow injection is achieved. The changes in the liquid storage volume and flow rate during the alternating cycle injection process are shown in Table 2 below.

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

[0114]

[0115] In the embodiment of the present invention, refer to Figure 2 As shown, during the injection process, the liquid flow rate remains constant, indicating that the liquid flow rate can be kept constant during the injection process by performing alternate circulation injection on the core through the liquid flow control mechanism 1.

[0116] Obviously, the ratio of Q1, Q2, and Q3 is not limited to 60:40:0, and can be reasonably set according to factors such as the capacity of the cavity, as long as the flow rate and flow velocity can be maintained stable under continuous flow. No limitation is made here.

[0117] The specific operation process of mining simulation can include:

[0118] The liquid production 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 to be the total liquid production flow rate from the core by the liquid flow control mechanism 1. The relationship between q1, q2, q3 and q satisfies the following formula:

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

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

[0121] First, the pistons of the first cavity 111, the second cavity 112, and the third cavity 113 are moved to the top of the cavity to drain the liquid from the cavity (the maximum liquid storage volume of the first cavity 111, the second cavity 112, and the third cavity 113 are V1, V2, and V3, respectively);

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

[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 in a ratio of 60:40:0;

[0124] In the second stage, when the liquid storage volume of the first cavity 111 is 95% of the maximum liquid storage 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 to connect the first cavity 111 with the liquid storage tank 3. The first delivery pump 121 links the piston in the first cavity 111 to move upward, and the first cavity 111 starts to discharge liquid until the liquid storage volume V1 is 0, the third control valve 133 is closed, and the first control valve 131 is opened;

[0125] In the third stage, when the liquid volume of the second cavity 112 is 95% 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, the fourth control valve 134 is opened, the second cavity 112 is connected to the liquid storage tank 3, the second delivery pump 122 links the piston in the second cavity 112 to move upward, the second cavity 112 starts to discharge liquid until the liquid volume V2 is zero, the fourth control valve 134 is closed, and the second control valve 132 is opened;

[0126] In the fourth stage, when the liquid storage volume of the third cavity 113 is 95% of the maximum liquid storage volume V3, the ratio of q1, q2, and q3 is adjusted to 60:40:0, the third control valve 133 is closed, the sixth control valve 136 is opened, the third cavity 113 is connected with the liquid storage tank 3, the third delivery pump 123 links the piston in the third cavity 113 to move upward, the third cavity 113 starts to discharge liquid until the liquid storage volume V3 is zero, the sixth control valve 136 is closed, and the third control valve 133 is opened;

[0127] In this cycle, the first cavity 111, the second cavity 112, and the third cavity 113 are alternately drained and produced to ensure that the liquid flow control mechanism 1 continuously produces liquid at a constant liquid flow, and the liquid is continuously and steadily produced from the core, that is, steady-state flow production is achieved. The changes in the liquid storage volume and flow rate during the alternating cycle production process are shown in Table 2 below.

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

[0129]

[0130]

[0131] In the embodiment of the present invention, refer to Figure 2 As shown, during the production process, the liquid flow rate remains constant, indicating that the liquid flow rate can be kept constant during the production process by performing alternating circulation of liquid collection on the core through the liquid flow control mechanism 1.

[0132] Obviously, the ratio of q1, q2, and q3 is not limited to 60:40:0, and can be reasonably set according to factors such as the capacity of the cavity, as long as the flow rate and flow velocity can be maintained stable under continuous flow. No limitation is made here.

[0133] The steady-state flow liquid injection and production simulation device provided in the embodiment of the present invention realizes the stable output or suction of steady-state flow liquid by the liquid flow control mechanism 1 through the monitoring, analysis and control of the control analyzer 2. It is suitable for different injection and production liquid flow ranges, different injection and production pressure ranges, etc., and can solve the problem of flow simulation of liquids with different flow rates in indoor experiments of gas storage reservoirs, so as to carry out physical simulation of gas storage reservoir construction and periodic injection and production operation, analyze the pore space utilization characteristics and change laws during the gas storage reservoir construction and injection and production operation, and study the influence of liquid flow rate on storage capacity parameters during the injection and production process.

[0134] Embodiment 2

[0135] Based on the same inventive concept, the embodiment of the present invention also provides a method for simulating the injection and production of a steady-state liquid flow, using the steady-state liquid flow injection and production simulation device described in the first embodiment, referring to Figure 3 As shown, including:

[0136] S101: Controlling the actions of the delivery pumps by the control analyzer 2, filling the liquid in the liquid storage tank 3 into each cavity respectively, and alternately cyclically injecting the liquid in each cavity into the core according to a set flow rate ratio to simulate steady-state flow liquid injection;

[0137] S102: The analyzer 2 is used to control the actions of the delivery pumps, and the liquid in the core is collected into each cavity in an alternate cycle according to the set flow rate ratio, and the liquid in each cavity is filled into the liquid storage tank 3 to simulate the steady-state flow liquid production.

[0138] In the embodiment of the present 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 Example 1. Its specific implementation process can refer to the process of using the steady-state flow liquid injection and production simulation device in Example 1 to implement steady-state flow liquid injection and production simulation. The repeated parts will not be repeated here.

[0139] In the embodiment of the present invention, the analyzer 2 is controlled to control the actions of the delivery pumps, the liquid in the liquid storage tank 3 is respectively filled into each cavity, and the liquid in each cavity is alternately cyclically injected into the core according to a set flow rate ratio to simulate steady-state liquid injection, which may include:

[0140] Control the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 to respectively fill the liquid in the liquid storage tank 3 into the first cavity 111, the second cavity 112 and the third cavity 113;

[0141] Control the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 to alternately circulate and inject the liquids in the first cavity 111, the second cavity 112 and the third cavity 113 into the core according to a set flow rate ratio;

[0142] When the amount of liquid stored in the first cavity 111 reaches a first preset value, the first delivery pump 121 is controlled to fill the liquid in the liquid storage tank 3 into the first cavity 111;

[0143] When the amount of liquid stored in the second cavity 112 reaches a second preset value, the second delivery pump 122 is controlled to fill the liquid in the liquid storage tank 3 into the second cavity 112;

[0144] When the amount of liquid stored in the third cavity 113 reaches a third preset value, the third delivery pump 123 is controlled to fill the liquid in the liquid storage tank 3 into the third cavity 113 .

[0145] In the embodiment of the present invention, before controlling the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 to respectively fill the liquid in the liquid storage tank 3 into the first cavity 111, the second cavity 112 and the third cavity 113, the following may also be included:

[0146] The temperature in the temperature control box 7 is adjusted to a first preset temperature by controlling the analyzer 2 .

[0147] In the embodiment of the present 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 liquids in the first cavity 111, the second cavity 112 and the third cavity 113 into the core according to the set flow ratio, the following may also be included:

[0148] According to the pressure monitoring result of the pressure sensor 6, the actions of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 are controlled so that the core inlet pressure is within the first preset pressure range.

[0149] In the embodiment of the present invention, the analyzer 2 is controlled to control the actions of each delivery pump, the liquid in the core is collected into each cavity in an alternate cycle according to a set flow rate ratio, and the liquid in each cavity is filled into the liquid storage tank 3 to simulate the steady-state flow liquid production, including:

[0150] Control the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 to alternately and cyclically inject 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;

[0151] When the amount of liquid stored in the first cavity 111 reaches a fourth preset value, the first delivery pump 121 is controlled to fill the liquid in the first cavity 111 into the liquid storage tank 3;

[0152] When the amount of liquid stored in the second cavity 112 reaches a fifth preset value, the second delivery pump 122 is controlled to charge the liquid in the second cavity 112 into the liquid storage tank 3;

[0153] When the amount of liquid stored in the third cavity 113 reaches a sixth preset value, the third delivery pump 123 is controlled to fill the liquid in the third cavity 113 into the liquid storage tank 3 .

[0154] In the embodiment of the present 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 the set flow ratio, the following may also be included:

[0155] The temperature in the temperature control box 7 is adjusted to a second preset temperature by controlling the analyzer 2 .

[0156] In the embodiment of the present invention, before or after controlling the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 to alternately circulate and inject 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, the following may also be included:

[0157] According to the pressure monitoring result of the pressure sensor 6, the actions of the first delivery pump 121, the second delivery pump 122 and the third delivery pump 123 are controlled so that the core inlet pressure is within the second preset pressure range.

[0158] Embodiment 3

[0159] Based on the same inventive concept, an embodiment of the present invention further 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.

[0160] In the embodiment of the present 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-mentioned embodiment 1, and the repeated parts will not be repeated here.

[0161] Obviously, various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various changes and modifications may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims. Thus, if these changes and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A steady-state flow liquid injection and production simulation device, characterized in that: It includes a liquid flow control mechanism, a control analyzer, a liquid storage tank and a core container; The flow control mechanism comprises at least three cavities and at least three delivery pumps; each of the cavities 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 suitable for accommodating the core; The control analyzer is respectively connected to each of the delivery pumps by signal; The control analyzer can control the action of each of the delivery pumps, so that during the simulated injection process, the liquid in the liquid storage tank is respectively filled into each of the cavities, and the liquid in each of the cavities is alternately cyclically injected into the core according to a set flow rate ratio; Furthermore, during the simulated production process, the liquid in the core is collected into each of the cavities in an alternate cycle according to a set flow rate ratio, and the liquid in each of the cavities is filled into the liquid storage tank.

2. The steady-state flow liquid injection and production simulation device according to claim 1, characterized in that: The steady-state flow liquid injection and production simulation device also includes a temperature control box; The liquid flow control mechanism and the liquid storage tank are arranged in the temperature control box; The control analyzer signal 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 device 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 device 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 respectively connected to the first flow meter, the second flow meter, the third flow meter and the core container; The control analyzer is respectively connected to the first flow meter, the second flow meter, the third flow meter and the fourth flow meter by signals; 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 device 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 arranged between the core container and the fourth flow meter; The control analyzer signal is connected to the pressure sensor; the control analyzer can obtain the pressure monitoring result of the pressure sensor.

6. The steady-state flow liquid injection and production simulation device 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 disposed between the first cavity and the core container; The second control valve is disposed between the second cavity and the core container; The third control valve is arranged between the third cavity and the core container; The fourth control valve is arranged between the first cavity and the liquid storage tank; The fifth control valve is arranged between the second cavity and the liquid storage tank; The sixth control valve is disposed between the third cavity and the liquid storage tank.

7. A method for simulating the injection and production of a steady-state liquid, using the steady-state liquid injection and production simulation device according to any one of claims 1 to 6, characterized in that: include: The analyzer is used to control the actions of the delivery pumps, so that the liquid in the liquid storage tank is respectively filled into each cavity, and the liquid in each cavity is alternately cyclically injected into the core according to a set flow rate ratio to simulate steady-state liquid injection; The control analyzer controls the action of each delivery pump, collects the liquid in the core into each cavity in an alternate cycle according to a set flow rate ratio, and fills the liquid in each cavity into the liquid storage tank to simulate steady-state flow liquid production.

8. The method for simulating steady-state liquid injection and production according to claim 7, characterized in that: The control analyzer controls the actions of the delivery pumps to fill the liquid in the liquid storage tank into each cavity respectively, and alternately and cyclically injects the liquid in each cavity into the core according to a set flow rate ratio to simulate steady-state liquid injection, including: Controlling the first delivery pump, the second delivery pump and the third delivery pump to respectively fill the liquid in the liquid storage tank into the first cavity, the second cavity and the third cavity; Controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject the liquids in the first cavity, the second cavity and the third cavity into the core according to a set flow rate ratio; When the amount of liquid stored in the first cavity reaches a first preset value, controlling the first delivery pump to fill the liquid in the liquid storage tank into the first cavity; When the amount of liquid stored in the second cavity reaches a second preset value, controlling the second delivery pump to fill the liquid in the liquid storage tank into the second cavity; When the amount of liquid stored in the third cavity reaches a third preset value, the third delivery pump is controlled to fill the liquid in the liquid storage tank into the third cavity.

9. The method for simulating steady-state flow liquid injection and production according to claim 8, characterized in that: Before controlling the first delivery pump, the second delivery pump and the third delivery pump to respectively charge the liquid in the liquid storage tank into the first cavity, the second cavity and the third cavity, the method further includes: The temperature in the temperature control box is adjusted to a first preset temperature by the control analyzer.

10. The method for simulating steady-state flow liquid injection and production according to claim 8, characterized in that: Before or after controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject the liquids in the first cavity, the second cavity and the third cavity into the core according to a set flow rate ratio, the method further includes: According to the pressure monitoring result of the pressure sensor, the actions of the first delivery pump, the second delivery pump and the third delivery pump are controlled to make the core inlet pressure within a first preset pressure range.

11. The method for simulating steady-state flow liquid injection and production according to claim 7, characterized in that: The control analyzer controls the actions of the delivery pumps to collect the liquid in the core into the cavities in an alternating cycle according to a set flow rate ratio, and fills the liquid in each cavity into the liquid storage tank to simulate steady-state liquid production, including: Controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject the liquid in the core into the first cavity, the second cavity and the third cavity according to a set flow rate ratio; When the amount of liquid stored in the first cavity reaches a fourth preset value, controlling the first delivery pump to fill the liquid in the first cavity into the liquid storage tank; When the amount of liquid stored in the second cavity reaches a fifth preset value, controlling the second delivery pump to charge the liquid in the second cavity into the liquid storage tank; When the amount of liquid stored in the third cavity reaches a sixth preset value, the third delivery pump is controlled to fill the liquid in the third cavity into the liquid storage tank.

12. The method for simulating steady-state flow liquid injection and production according to claim 11, characterized in that: Before controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject 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: The temperature in the temperature control box is adjusted to a second preset temperature by the control analyzer.

13. The method for simulating steady-state flow liquid injection and production according to claim 11, characterized in that: Before or after controlling the first delivery pump, the second delivery pump and the third delivery pump to alternately and cyclically inject 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: According to the pressure monitoring result of the pressure sensor, the actions of the first delivery pump, the second delivery pump and the third delivery pump are controlled to make the core inlet pressure within a second preset pressure range.

14. Use of the steady-state flow liquid injection and production simulation device according to any one of claims 1 to 6 in steady-state flow liquid injection and production simulation.

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