Experimental device, method and system for unconventional oil and gas recovery ratio measurement

Abstract

The embodiment of the invention provides an experimental device, method and system for unconventional oil and gas recovery ratio measurement, and belongs to the technical field of oil and gas exploration and development. The experimental device comprises: a sample holder; a pressure applicator; an incubator; an oil gas injector; a fracturing fluid injector; a liquid collector; and a gas collector. According to the experimental device for measuring the unconventional oil and gas recovery ratio provided by the embodiment of the invention, simulation of conditions of a stratum where an experimental sample is located and simulation of various states of the experimental sample can be realized by changing the overburden pressure, the fluid pressure and the temperature of the sample holder; fracturing fluid injection under the simulated formation condition is adopted, and the defect that fracturing simulation cannot be achieved through existing experimental simulation equipment is overcome. By measuring the injected oil gas quantity and the discharged oil gas quantity of the sample holder, the recovery efficiency of the experimental sample in depletion exploitation in each state can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration and development, and in particular to an experimental device, method and system for measuring unconventional oil and gas recovery rate. Background Art

[0002] Unconventional oil and gas resources are larger than conventional oil and gas resources. Therefore, unconventional oil and gas has become an important direction for increasing oil and gas reserves and production. Conventional development technology for tight unconventional oil and gas reservoirs cannot achieve scale-effective development, and volume fracturing is required to achieve effective development. Conventional oil and gas use elastic drive technology and determine the evaluable recovery rate through experiments. This is based on the good physical properties and pore connectivity of conventional oil and gas reservoirs, and fluids can flow well in them. Unconventional oil and gas reservoirs are tight and have poor pore connectivity, so the fluidity of fluids in them is poor. Volume fracturing must be used to effectively connect their pores so that fluids can flow in them.

[0003] Unconventional oil and gas are generally produced by depletion extraction, but the recovery rate is low, generally less than 10%, and there is no feasible experimental technology to measure the recovery rate of unconventional oil and gas. Therefore, how to achieve the measurement of unconventional oil and gas recovery rate in the laboratory is a technical problem that has not yet been solved. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide an experimental device for measuring the recovery rate of unconventional oil and gas, which can realize the measurement of the recovery rate of unconventional oil and gas in the laboratory.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides an experimental device for measuring unconventional oil and gas recovery rate, characterized in that the experimental device comprises: a sample holder, comprising a top, a bottom and a side enclosure; a pressure applicator, fixed to the sample holder by a fixture, and used to apply pressure to the sample holder by driving a pressure pump, the pressure applicator comprising a top pressure applicator located at the top of the sample holder, a bottom pressure applicator at the bottom and a lateral confining pressure applicator at the side enclosure; a constant temperature box, in which the sample holder is located; an oil and gas injector, connected to the top of the sample holder by an oil and gas injection pipe, one end of the oil and gas injection pipe is connected to the oil and gas injector , the other end is connected to the injection port of the unidirectional porous disk, and the unidirectional porous disk is located between the top pressure applicator and the sample holder; a fracturing fluid injector, connected to the bottom of the sample holder through a fracturing fluid injection tube, one end of the fracturing fluid injection tube is connected to the fracturing fluid injector, and the other end is connected to the injection port of the bidirectional porous disk, and the bidirectional porous disk is located between the bottom pressure applicator and the sample holder; a liquid collector, connected to the sample holder through a discharge fluid collection tube, one end of the discharge fluid collection tube is connected to the liquid collector, and the other end is connected to the discharge port of the bidirectional porous disk; a gas collector, connected to the liquid collector through a gas collection tube.

[0006] Optionally, the inner wall of the side of the sample holder is lined with a temperature-resistant hard rubber sleeve of preset thickness, and a sample sleeve is provided between the temperature-resistant hard rubber sleeve and the experimental sample. The sample sleeve is made of a temperature-resistant flexible alloy of preset thickness, and has etched grooves on its inner side in contact with the experimental sample, and the etched grooves are evenly distributed at equal intervals.

[0007] Optionally, the pressure applicator is a hollow structure, the outer wall of which is made of a pressure-resistant alloy of a preset thickness, and the inner wall of which is made of an elastic alloy of a preset thickness.

[0008] Optionally, the unidirectional porous disc is a double-layer structure, and one side of the layer in contact with the experimental sample has etched grooves distributed radially, parallel or obliquely, and the etched grooves are distributed with circular holes penetrating the layer.

[0009] Optionally, the bidirectional porous disc is a double-layer structure, and both layers are provided with etching grooves, which are distributed radially, parallel or obliquely, and circular holes penetrating corresponding layers are distributed on the etching grooves, and the etching grooves are distributed correspondingly to the circular holes.

[0010] Optionally, the experimental device also includes a pressure sensor and a first reverse valve, wherein the first reverse valve is arranged between the pressure pump and the pressure applicator, and the pressure applied to the sample holder is controlled by the pressure pump, the pressure applicator, the pressure sensor and the first reverse valve.

[0011] Optionally, the experimental device also includes a second reverse valve and a third reverse valve, the second reverse valve is arranged between the oil and gas injector and the sample holder, and the fluid pressure applied to the core sample of the sample holder is controlled through the oil and gas injector, the pressure sensor, and the second reverse valve; the third reverse valve is arranged between the fracturing fluid injector and the sample holder, and the fluid pressure applied to the core sample of the sample holder is controlled through the fracturing fluid injector, the pressure sensor, and the third reverse valve.

[0012] Optionally, the experimental device also includes a cooling box, and the liquid collector is located in the cooling box.

[0013] An embodiment of the present invention also provides a method for measuring unconventional oil and gas recovery rate based on the above-mentioned experimental device, and the method for measuring unconventional oil and gas recovery rate includes: after loading a calibration sample or a core sample into a sample holder, performing the following experimental steps on each experimental sample in the calibration sample and the core sample respectively: driving a pressure applicator through a pressure pump to evacuate the sample holder; controlling an oil and gas injector to apply a first fluid pressure to the experimental sample according to a preset pressure rate, controlling a fracturing fluid injector to apply a second fluid pressure to the experimental sample according to a preset pressure rate, and controlling a constant temperature box to heat the experimental sample to a preset temperature point according to a preset heating rate; according to a preset discharge pressure, when the fluid pressure applied to the experimental sample is reduced to a preset pressure point, controlling the injection of a preset volume of oil and a preset volume of gas; obtaining a corresponding discharged oil volume and a corresponding discharged gas volume; and calculating the oil and gas recovery rate of the core sample through the corresponding injected oil volume, injected gas volume, discharged oil volume and discharged gas volume of the two experiments.

[0014] Optionally, the calibration sample is an alloy sample.

[0015] Optionally, before loading the core sample into the sample holder, the method for measuring the unconventional oil and gas recovery rate further comprises: washing oil and drying the core sample.

[0016] Optionally, before obtaining the corresponding discharged oil volume and the corresponding discharged gas volume, the method for measuring the unconventional oil and gas recovery factor further includes: condensing the discharged oil.

[0017] Optionally, the oil and gas recovery factor of the core sample is calculated by using the injected oil volume, injected gas volume, discharged oil volume and discharged gas volume corresponding to the two experiments, including: obtaining the oil volume Vo1 discharged by the core sample by the difference between the discharged oil volume Veo2 corresponding to the experiment on the core sample and the discharged oil volume Veo1 corresponding to the experiment on the calibration sample, and obtaining the gas volume Vg discharged by the core sample by the difference between the discharged gas volume Veg2 corresponding to the experiment on the core sample and the discharged gas volume Veg1 corresponding to the experiment on the calibration sample. 1; the oil volume Vo2 passing through the core sample is obtained by the difference between the injected oil volume Vio2 corresponding to the experiment on the core sample and the injected oil volume Vio1 corresponding to the experiment on the calibration sample; the gas volume Vg2 passing through the core sample is obtained by the difference between the injected gas volume Vig2 corresponding to the experiment on the core sample and the injected gas volume Vig1 corresponding to the experiment on the calibration sample; the oil recovery rate in the core sample is calculated based on Vo1 / Vo2; and the gas recovery rate in the core sample is calculated based on Vg1 / Vg2.

[0018] An embodiment of the present invention also provides a control device for measuring unconventional oil and gas recovery rate, characterized in that the control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the above-mentioned unconventional oil and gas recovery rate measurement method.

[0019] An embodiment of the present invention further provides a machine-readable storage medium, on which instructions are stored, and the instructions enable a machine to execute the above-mentioned method for measuring unconventional oil and gas recovery rate.

[0020] An embodiment of the present invention further provides an experimental system for measuring unconventional oil and gas recovery rate, wherein the experimental system comprises the above-mentioned experimental device and the above-mentioned control device.

[0021] Through the above technical solution, the experimental device for measuring the recovery rate of unconventional oil and gas provided by the embodiment of the present invention can simulate the formation conditions of the experimental sample and simulate various states of the experimental sample by changing the overburden size, fluid pressure size and temperature of the sample holder; the injection of fracturing fluid under simulated formation conditions overcomes the defect that the existing experimental simulation equipment cannot realize fracturing simulation. By measuring the injected oil and gas volume and the discharged oil and gas volume of the sample holder, the recovery rate of the experimental sample under various states for depletion mining can be obtained.

[0022] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the structure of an experimental device for measuring unconventional oil and gas recovery rate provided by an embodiment of the present invention;

[0025] Figure 2 It is a schematic plan view of the inner surface of the sample package;

[0026] Figure 3 is a schematic diagram of the structure of an example unidirectional porous disk;

[0027] Figure 4 is a schematic diagram of the structure of an example bidirectional porous disk; and

[0028] Figure 5 The embodiment of the present invention provides Figure 1 Schematic diagram of the flow chart of the method for measuring the unconventional oil and gas recovery rate implemented by the experimental device.

[0029] Description of Reference Numerals

[0030] 101. sample holder; 102. top pressure applicator; 1021. top fixer;

[0031] 103. Bottom covering pressure applicator; 1031. Bottom fixer; 104. Lateral confining pressure applicator;

[0032] 105. Lateral confining pressure pump; 106. Top covering pressure pump; 107. Bottom covering pressure pump;

[0033] 108. Oil and gas injector; 1081. Fracturing fluid injector; 109. Liquid collector;

[0034] 1010. Gas collector; 1011. Constant temperature box; 1012. Cooling box;

[0035] 1013. Oil and gas injection meter and reverse valve; 1014. Lateral pressure controller and reverse valve;

[0036] 1015, top pressure controller and reverse valve; 1016, bottom pressure controller and reverse valve;

[0037] 1017. Discharge fluid collection meter and reversing valve;

[0038] 1082. Fracturing fluid injection meter and reverse valve; 1101. Top pressure sensor;

[0039] 1102. bottom pressure sensor; 1103. lateral pressure sensor;

[0040] 1104, lateral pressure sensor; 1201, top temperature sensor;

[0041] 1202, bottom temperature sensor; 1203, lateral temperature sensor;

[0042] 1204, lateral temperature sensor; 1301, oil and gas injection pipe; 1302, fracturing fluid injection pipe;

[0043] 1303, exhaust fluid collection pipe; 1304, gas collection pipe; 20, one-way porous disc;

[0044] 21. Bidirectional porous disc; 22. Sample bag; 23. Heat-resistant hard rubber sleeve. DETAILED DESCRIPTION

[0045] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0046] Figure 1 This is a schematic diagram of the structure of an experimental device for measuring unconventional oil and gas recovery rate provided by an embodiment of the present invention. Please refer to Figure 1The experimental device may include: a sample holder 101, including a top, a bottom and a side enclosure; a pressure applicator (102, 103, 104), fixed to the sample holder 101 through a fixture (1021, 1031), used to apply pressure to the sample holder 101 through the drive of a pressure pump (105, 106, 107), the pressure applicator (102, 103, 104) including a top pressure applicator 102 located at the top of the sample holder 101, a bottom pressure applicator 103 located at the bottom and a lateral pressure applicator 104 located at the side enclosure; a constant temperature box 1011, the sample holder 101 is located in the constant temperature box 1011; an oil and gas injector 108, connected to the top of the sample holder 101 through an oil and gas injection pipe 1301, one end of the oil and gas injection pipe 1301 is connected to the oil and gas injector 108, and the other end is connected to the oil and gas injector 108. The one-way porous disk 20 is connected to the injection port, and the one-way porous disk 20 is located between the top pressure applicator 102 and the sample holder 101; the fracturing fluid injector 1801 is connected to the bottom of the sample holder 101 through the fracturing fluid injection pipe 1302, one end of the fracturing fluid injection pipe 1302 is connected to the fracturing fluid injector 1801, and the other end is connected to the injection port of the two-way porous disk 21, and the two-way porous disk 21 is located between the bottom pressure applicator 103 and the sample holder 101; the liquid collector 109 is connected to the sample holder 101 through the exhaust fluid collection pipe 1303, one end of the exhaust fluid collection pipe 1303 is connected to the liquid collector 109, and the other end is connected to the exhaust port of the two-way porous disk 21; the gas collector 1010 is connected to the liquid collector 109 through the gas collection pipe 1304.

[0047] For example, the experimental sample is placed in the sample holder 101. The top of the experimental sample is connected to the top pressure applicator 102 through the unidirectional porous disc 20, and the top pressure applicator 106 drives the top pressure applicator to apply the top pressure to the experimental sample; the bottom of the experimental sample is connected to the bottom pressure applicator 103 through the bidirectional porous disc 21, and the bottom pressure applicator 107 drives the bottom pressure applicator to apply the bottom pressure to the experimental sample; the lateral confining pressure applicator 104 drives the lateral confining pressure pump 105 to apply the lateral pressure to the experimental sample. Preferably, the thermostat 1011 is also equipped with temperature sensors (1201, 1202, 1203, 1204), for example, a top temperature sensor 1201, a bottom temperature sensor 1202, a lateral temperature sensor 1203 and a lateral temperature sensor 1204. The temperature in the sample holder 101 is the temperature set for the experiment, and the temperature is controlled and maintained by the temperature sensors (1201, 1202, 1203, 1204) and the thermostat 1011. Preferably, the sample holder 101, the top pressure applicator 102, the bottom pressure applicator 103, the lateral confining pressure applicator 104, the bottom fixture 1031, the top fixture 1021, and the temperature sensors (1201, 1202, 1203, 1204) are placed in the thermostat 1011 to maintain the temperature required for the experiment. The oil and gas injector 108 is connected to the oil and gas injection pipe 1301, and controls the fluid pressure applied to the experimental sample. The fracturing fluid injector 1081 is connected to the fracturing fluid injection pipe 1302, and controls the fluid pressure applied to the experimental sample. The liquid collector 109 is connected to the exhaust fluid collection pipe 1303, and is used to collect the fluid discharged from the experiment. The gas collector 1010 is connected to the liquid collector 109 through the gas collection pipe 1304, and is used to collect the gas discharged from the experiment.

[0048] The experimental device for measuring the recovery rate of unconventional oil and gas provided in the embodiment of the present invention can simulate the formation conditions of the experimental sample and various states of the experimental sample by changing the overburden size, fluid pressure and temperature of the sample holder; the injection of fracturing fluid under simulated formation conditions overcomes the defect that the existing experimental simulation equipment cannot realize fracturing simulation. The recovery rate of the experimental sample under various states can be obtained by measuring the injected and discharged oil and gas volumes of the sample holder.

[0049] In the preferred embodiment of the present invention, the inner wall of the side of the sample holder 101 is lined with a temperature-resistant hard rubber sleeve 23 of a preset thickness, and between the temperature-resistant hard rubber sleeve 23 and the experimental sample is a sample sleeve 22. Preferably, the sample sleeve 22 is made of a temperature-resistant flexible alloy of a preset thickness, and the inner side thereof in contact with the experimental sample has etched grooves, and the etched grooves are evenly distributed at equal intervals.

[0050] For example, the sample holder 101 is lined with a heat-resistant hard rubber sleeve 23 on the inner side thereof. The heat-resistant hard rubber sleeve 23 is preferably a hard rubber sleeve, and the thickness is preferably less than or equal to 1 cm. The sample sleeve 22 is provided between the hard rubber sleeve 23 and the experimental sample. Figure 2 As shown, the sample sheath 22 can be made of a temperature-resistant flexible alloy, and the thickness of the sample sheath 22 is preferably less than or equal to 1 cm. The inner side 2210 of the sample sheath 22 in contact with the experimental sample has etched grooves 2211, and the etched grooves 2211 are preferably evenly distributed at equal intervals, such as 1 cm-2 cm, and the depth of the etched grooves 2211 is, for example, greater than 1 μm, and is used to make the temperature-resistant hard rubber sleeve 23 and the sample sheath 22, and the sample sheath 22 and the experimental sample closely contact when applying pressure to the experimental sample (for example, a core sample), and the etched grooves will discharge the fluid discharged from the experimental sample out of the sample holder 101.

[0051] The sample holder 101 composed of the top pressure applicator 102, the bottom pressure applicator 103 and the lateral confining pressure applicator 104 may be cylindrical in shape, with a diameter ranging from 5 cm to 20 cm and a length ranging from 5 cm to 50 cm.

[0052] The preferred thermostatic box 1011 in the embodiment of the present invention is wrapped with asbestos for heat preservation.

[0053] The pressure applicator (102, 103, 104) preferably in the embodiment of the present invention is a hollow structure, the outer wall of which is made of a pressure-resistant alloy of a preset thickness, and the inner wall of which is made of an elastic alloy of a preset thickness.

[0054] By way of example, the lateral confining pressure applicator 104, the top covering pressure applicator 102, and the bottom covering pressure applicator 103 are all hollow structures, and the outer wall of the pressure applicator (102, 103, 104) is preferably made of a pressure-resistant alloy material with a thickness of not less than 5 cm, and the inner wall is preferably made of an elastic alloy material with a thickness of not more than 1 cm. Preferably, the outer wall of the pressure applicator (102, 103, 104) is made of stainless steel, and the inner wall is made of titanium-iron-carbon-gold rare earth alloy, which can withstand a temperature of 800°C and a pressure of 120 MPa. The inner wall of the pressure applicator (102, 103, 104) can be expanded and contracted according to the size of the pressure of the hollow structure (layer). The lateral confining pressure pump 105 applies the required pressure of the experimental sample to the lateral overburden applicator 104, the top overburden pressure pump 106 applies the required pressure of the experimental sample to the top overburden applicator 102, and the bottom overburden pressure pump 107 applies the required pressure of the core sample to the bottom overburden applicator 103 to simulate the pressure of the formation where the experimental sample is located.

[0055] The pressure applicator (top pressure applicator, bottom pressure applicator, lateral confining pressure applicator) is a hollow structure, which overcomes the defects of mechanical pressure application in the prior art, and the applied pressure is more accurate and easy to control. The inner wall of the pressure applicator is made of a retractable flexible temperature-resistant alloy, which can shrink when pressure is applied. Preferably, the inner wall of the lateral confining pressure applicator is in close contact with the experimental sample through a temperature-resistant hard rubber sleeve and a sample sleeve, which can ensure that the experimental sample is not easily crushed. The sample sleeve is made of a flexible alloy, and there is an etched groove inside the sample sleeve to ensure that the fluid discharged from the experimental sample is discharged through the etched groove.

[0056] The one-way porous disk 20 preferably has a double-layer structure in the embodiment of the present invention. One side of the layer in contact with the experimental sample has etched grooves distributed radially, parallel or obliquely. The etched grooves have circular holes that penetrate the layer.

[0057] For example, a one-way porous disk through which fluid can pass is arranged on the top of the sample holder (the experimental sample in the sample holder), such as Figure 3 As shown, the unidirectional porous disk is composed of two layers, the contact layer 2015 with the top pressure applicator has no etched grooves and circular holes on the surface, and the contact layer 2016 with the experimental sample has etched grooves 2012 on both sides, and circular holes 2013 that penetrate the layer are distributed on the etched grooves 2012. The etched grooves 2012 of the unidirectional porous disk are distributed radially, parallel or obliquely, the depth of the etched grooves 2012 is, for example, greater than 1 μm, and the diameter of the circular holes 2013 on the etched grooves 2012 is, for example, not greater than 10 μm. The hole density of the unidirectional porous disk is, for example, not less than 100 / cm 2 The fluid injection port of the one-way porous disc is connected to the oil and gas injection pipe.

[0058] The bidirectional porous disc 21 preferably in the embodiment of the present invention is a double-layer structure, and both layers are provided with etched grooves, which are distributed radially, parallel or obliquely, and circular holes penetrating the corresponding layers are distributed on the etched grooves, and the etched grooves are distributed correspondingly to the circular holes.

[0059] For example, the bottom of the sample holder (the experimental sample in the sample holder) is provided with a bidirectional porous disk through which fluid can pass in both directions, such as Figure 4 As shown, the bidirectional porous disc is composed of two layers, both of which have etched grooves 2112, and the etched grooves 2112 are distributed with circular holes (2113, 2116) penetrating the layer. The etched grooves 2112 of the two layers of the bidirectional porous disc are distributed correspondingly to the circular holes (2113, 2115). Preferably, the etched grooves 2112 of the bidirectional porous disc are distributed radially, parallelly or obliquely, and the depth of the etched grooves 2112 is, for example, greater than 1 μm, and the diameter of the circular holes (2113, 2115) on the etched grooves 2112 is, for example, not greater than 10 μm. The hole density of the bidirectional porous disc is, for example, not less than 100 / cm2 The injection port 2114 of the bidirectional porous disc is connected to the fracturing fluid injection pipe, and the discharge port 2115 of the bidirectional porous disc is connected to the discharge fluid collection pipe.

[0060] The top of the sample holder and the top pressure applicator, as well as the bottom of the sample holder and the bottom pressure applicator are in close contact via a porous disc (a one-way porous disc or a two-way porous disc), which can ensure that the porous disc is in close contact with the experimental sample, while ensuring that the injected oil and gas and the injected fracturing fluid can smoothly enter the experimental sample, and the fluid discharged from the experimental sample can be smoothly discharged from the discharged fluid collection pipe, thus overcoming the technical defect of the existing experimental equipment that the fluid injection pipe and the fluid discharge pipe are easily blocked during the experiment.

[0061] Further preferably, the top covering pressure applicator 102, the bottom covering pressure applicator 103 and the lateral confining pressure applicator 104 form the shape of the sample holder 101, and alloy gaskets are respectively provided at the contact point between the top covering pressure applicator 102 and the lateral confining pressure applicator 104, and at the contact point between the bottom covering pressure applicator 103 and the lateral confining pressure applicator 104. The alloy gaskets are made of, for example, copper-graphite-carbon alloy and are used for sealing. As described above, there is a double-layered unidirectional porous disc 20 between the top pressure applicator 102 and the sample holder 101 (the experimental sample therein), and the unidirectional porous disc 20 is made of, for example, titanium-iron-carbon-gold rare earth alloy, and has good flexibility and invariance; there is a double-layered bidirectional porous disc 21 between the bottom pressure applicator 103 and the sample holder 101 (the experimental sample therein), and the bidirectional porous disc 21 is made of, for example, titanium-iron-carbon-gold rare earth alloy, and has good flexibility and invariance; there are a heat-resistant hard rubber sleeve 23 and a sample sheath 22 between the lateral confining pressure applicator 104 and the holder 101 (the experimental sample therein), respectively, and the heat-resistant hard rubber sleeve 23 can withstand temperatures up to 600°C, and the sample sheath 22 is made of, for example, titanium-iron-carbon-gold rare earth alloy, and has good flexibility and invariance. The experimental device provided by the embodiment of the present invention can ensure that no fluid leakage occurs during the experiment, and at the same time, can ensure that the experimental sample is not easily crushed.

[0062] Continue to refer Figure 1Preferably, the experimental device also includes a pressure sensor (1101, 1102, 1103, 1104), a first reverse valve (1014, 1015, 1016), and the first reverse valve (1014, 1015, 1016) is arranged between the pressure pump (105, 106, 107) and the pressure applicator (102, 103, 104), and the pressure applied to the sample holder 101 is controlled by the pressure pump (105, 106, 107), the pressure applicator (102, 103, 104), the pressure sensor (1101, 1102, 1103, 1104) and the first reverse valve (1014, 1015, 1016).

[0063] By way of example, the pressure sensors (1101, 1102, 1103, 1104) are used to measure the experimental pressure of the sample holder 101. Among them, the top pressure sensor 1101 is used to measure the pressure at the top of the sample holder 101 (experimental sample), and can be used together with the top pressure controller and the reverse valve 1015, and the top pressure applicator 102 to control the pressure at the top; the bottom pressure sensor 1102 is used to measure the pressure at the bottom of the sample holder 101 (experimental sample), and can be used together with the bottom pressure controller and the reverse valve 1016, and the bottom pressure applicator 103 to control the pressure at the bottom; the lateral pressure sensors (1103, 1104) are used to measure the lateral pressure of the sample holder 101 (experimental sample), and can be used together with the lateral pressure controller and the reverse valve 1014, and the lateral confining pressure applicator 104 to control the lateral confining pressure. Through the above settings, precise control of the experimental pressure of the sample holder can be achieved. The pressure sensors (1101, 1102, 1103, 1104) may also be placed in a constant temperature box.

[0064] Preferably, the experimental device also includes a second reverse valve and a third reverse valve, the second reverse valve is arranged between the oil and gas injector and the sample holder, and the fluid pressure applied to the core sample of the sample holder is controlled by the oil and gas injector, the pressure sensor and the second reverse valve, and the third reverse valve is arranged between the fracturing fluid injector and the sample holder, and the fluid pressure applied to the core sample of the sample holder is controlled by the fracturing fluid injector, the pressure sensor and the third reverse valve.

[0065] For example, when the oil and gas injector injects the oil and gas used in the experiment into the experimental sample in the sample holder, the pressure and flow of the injected fluid are controlled by the second reverse valve (e.g., the oil and gas injection meter and the reverse valve 1013) and the oil and gas injector, and the pressure of the sample holder is monitored in real time by the pressure sensor. Preferably, the final pressure of the experimental sample injected into the sample holder by the oil and gas injector is the fluid pressure of the formation where the experimental sample is located.

[0066] For example, when the fracturing fluid injector injects the fracturing fluid used in the experiment into the experimental sample in the sample holder, the pressure and flow of the injected fluid are controlled by the third reverse valve (e.g., the fracturing fluid injection meter and the reverse valve 1082) and the fracturing fluid injector, and the pressure of the sample holder is monitored in real time by the pressure sensor. Preferably, the final pressure of the experimental sample injected into the sample holder by the fracturing fluid should be greater than the fracture pressure of the experimental sample.

[0067] Preferably, the experimental device further comprises a fourth reverse valve, which is arranged between the liquid collector and the sample holder, and the pressure of the discharged fluid is controlled by controlling the fourth reverse valve. In the experiment, the discharged fluid enters the discharged liquid collector through the discharged fluid pipe. Preferably, the pressure of the discharged fluid (or discharge pressure) is set according to the minimum bottom hole pressure during the actual development of the formation where the experimental sample is located. The gas collector is used to collect the discharged gas, and the gas collector is connected to the liquid collector through a gas collecting pipe. One end of the gas collecting pipe can be arranged on the top of the liquid collector, and the other end is connected to the gas collector.

[0068] Preferably, the exhaust fluid collection tube can also be used to evacuate the sample holder through the exhaust fluid collection tube before the experiment.

[0069] Preferably, the experimental device further comprises a cooling box, wherein the liquid collector is located in the cooling box. The cooling box is used to condense the discharged fluid. The temperature of the cooling box is preferably maintained below 5° C. during the experiment.

[0070] The discharged fluid enters the discharged liquid collector through the discharged fluid pipe, and the discharged fluid is condensed and then collected, and the remaining gas enters the gas collector. This can overcome the defect that the existing experimental equipment collects gas by draining water, causing a large amount of gas to dissolve in water and inaccurate measurement of the discharged gas amount and components.

[0071] Figure 5 The embodiment of the present invention provides Figure 1 Please refer to the flowchart of the method for measuring the unconventional oil and gas recovery rate achieved by the experimental device. Figure 5 The method for measuring the unconventional oil and gas recovery rate may include the following steps:

[0072] Step S100: After the calibration sample or the core sample is loaded into the sample holder, the following experimental steps S110-S140 are performed on each experimental sample in the calibration sample and the core sample respectively.

[0073] Please refer to Figure 1 , place the experimental sample (calibration sample or core sample) in the sample holder 101. The top of the experimental sample is connected to the top pressure applicator 102 through the one-way porous disc 20, and the top pressure applicator 102, the top pressure controller and the reverse valve 1015 apply the top pressure to the sample; the bottom of the sample is connected to the bottom pressure applicator 103 through the two-way porous disc 21, and the bottom pressure applicator 103, the bottom pressure controller and the reverse valve 1016 apply the bottom pressure to the sample. The lateral confining pressure applicator 104 is connected to the lateral pressure controller and the reverse valve 1014 to apply lateral pressure to the sample. The thermostat 1011 is connected to the top temperature sensor 1201, the bottom temperature sensor 1202, the lateral temperature sensor 1203, and the lateral temperature sensor 1204 to control the temperature required for the experiment. The oil and gas injector 108 is connected to the oil and gas injection pipe 1301, and the fluid pressure applied to the sample is controlled by the oil and gas injection meter and the reverse valve 1013. The fracturing fluid injector 1081 is connected to the fracturing fluid injection pipe 1302, and the fluid pressure applied to the sample is controlled by the fracturing fluid injection meter and the reverse valve 1082. The exhaust fluid collection meter and the reverse valve 1017 control the experimental exhaust fluid pressure. The liquid collector 109 is connected to the exhaust fluid collection pipe 1303 to collect the experimental exhaust fluid, and the gas collector 1010 is connected to the liquid collector 109 through the gas collection pipe 1304 to collect the experimental exhaust gas. The experimental measurement of the unconventional oil and gas recovery rate in the embodiment of the present invention is achieved through the above-mentioned experimental device. Please refer to the above for the detailed technology of the experimental device, which will not be repeated here.

[0074] In the embodiment of the present invention, the experiment for each core sample is preferably divided into two steps: calibration and measurement. That is, firstly, the experiment is carried out with a calibration sample of similar size and specification to the core sample to obtain the injected and discharged oil and gas volume excluding the reservoir space influence of the core sample; then, the experiment is carried out with the core sample under the same conditions to obtain the injected and discharged oil and gas volume, so as to more accurately obtain the injected and discharged oil and gas volume of the core sample experiment, thereby accurately obtaining the oil and gas recovery rate of depletion recovery.

[0075] In the embodiment of the present invention, the calibration sample is preferably an alloy sample.

[0076] The core sample can be shale, mudstone or mud shale, dense sandstone, dense carbonate rock, volcanic rock, medium-high porosity rock, coal or other rocks. The calibration sample is incompressible, for example, alloy samples such as stainless steel can be used.

[0077] Preferably, before the core sample is loaded into the sample holder, the method for measuring the unconventional oil and gas recovery rate further comprises: washing the core sample with oil and drying it. For example, the drying temperature is not less than 50° C. and the drying time is not less than 24 hours. Further preferably, the surface of the core sample is polished.

[0078] Step S110: driving the pressure applicator through a pressure pump to evacuate the sample holder.

[0079] Before the experiment, the sample holder was subjected to pressure by the top pressure applicator, the bottom pressure applicator, and the lateral confining pressure applicator, and the inside of the sample holder was evacuated by exhausting the fluid collection tube.

[0080] Step S120: Control the oil and gas injector to apply a first fluid pressure to the experimental sample according to a preset pressure rate, control the fracturing fluid injector to apply a second fluid pressure to the experimental sample according to a preset pressure rate, and control the constant temperature box to heat the experimental sample to a preset temperature point according to a preset heating rate.

[0081] For example, a first fluid pressure is applied to the experimental sample (calibration sample or core sample) through an oil and gas injector, so that the fluid pressure of the experimental sample reaches the fluid pressure of the formation where the experimental sample is located. A second fluid pressure is applied to the experimental sample through a fracturing fluid injector, and the fluid pressure represents the fracturing fluid pressure used in the volume fracturing of the area where the experimental sample is located, so that the fracturing fluid is injected into the experimental sample, and the fluid pressure is greater than the fluid pressure of the formation. The sample is heated to a preset temperature point at a preset heating rate through a thermostat to simulate the temperature of the formation where the experimental sample is located.

[0082] Preferably, the fluid applied to the experimental sample by the fracturing fluid injector may be water or fracturing fluid, and the unconventional oil and gas recovery factor is measured under hydraulic fracturing conditions.

[0083] The calibration sample is a solid object without a reservoir space. The purpose of the calibration experiment is to determine the amount of oil and gas or fracturing fluid that can enter and be discharged from the space outside the sample. The core sample has a reservoir space. Through the same experimental steps as the calibration sample, the influence of oil and gas and fracturing fluid on pressure changes outside the sample can be eliminated. During the experiment, the preset fluid pressure of oil and gas injection, fluid pressure of fracturing fluid injection, and temperature of each core sample and its corresponding calibration sample are the same. However, due to the different reservoir spaces, the amount of oil and gas injection (i.e., volume) and fracturing fluid injection (i.e., volume) are different.

[0084] Step S130: According to a preset discharge pressure, when the fluid pressure applied to the test sample is reduced to a preset pressure point, a preset volume of oil and a preset volume of gas are controlled to be injected.

[0085] For example, the fluid in the sample holder is discharged through the discharge fluid collection meter and the reverse valve according to the preset discharge pressure. When the fluid pressure in the sample holder is reduced to the preset pressure, the valves of the discharge fluid collection meter and the reverse valve are closed to reduce the fluid pressure in the sample holder to the preset pressure, which is used to simulate the bottom hole flow pressure during production after fracturing, so that the preset pressure reaches the bottom hole flow pressure at the end of development. Then, the preset volume of oil and the preset volume of gas are injected into the experimental sample (calibration sample or core sample) through the oil and gas injector.

[0086] Step S140: Obtain the corresponding exhausted oil volume and the corresponding exhausted gas volume.

[0087] Following the above embodiment, the oil and gas volume and gas volume injected into the sample holder are recorded by the oil and gas injection meter and the reverse valve; the oil and gas volume discharged from the sample holder are recorded by the discharged fluid collection meter and the reverse valve.

[0088] Preferably, before step S140, the method for measuring the unconventional oil and gas recovery rate may further include: condensing the discharged oil.

[0089] The discharged oil is condensed by a cooling box. Preferably, the temperature of the cooling box is kept below 5°C during the experiment. The discharged fluid enters the discharged liquid collector through the discharged fluid pipe, and the discharged fluid is condensed and then collected, and the remaining gas enters the gas collector, which can overcome the defects of the existing experimental equipment that collects gas by draining water, causing a large amount of gas to dissolve in water, and the measurement of the discharged gas amount and components is inaccurate.

[0090] Preferably, after the experiment, all spaces into which oil, gas or fracturing fluid has entered can be cleaned by an organic solvent, preferably dichloromethane or chloroform.

[0091] Step S200: Calculate the oil and gas recovery factor of the core sample based on the injected oil volume, injected gas volume, discharged oil volume and discharged gas volume corresponding to the two experiments.

[0092] As mentioned above, since core samples have reservoir space and calibration samples do not have reservoir space, therefore, when the preset oil and gas injection fluid pressure, fracturing fluid injection fluid pressure, and temperature are the same for the core samples and the corresponding calibration samples (i.e., simulating the pressure and temperature in the formation, etc.), the amount (volume) of oil, gas, and fracturing fluid injected and produced by the calibration samples during the calibration experiment is different from the amount (volume) of oil, gas, and fracturing fluid injected and produced by the core samples.

[0093] Preferably, step S200 may include: obtaining the volume of oil Vo1 discharged through the core sample by the difference between the discharged oil volume Veo2 corresponding to the experiment on the core sample and the discharged oil volume Veo1 corresponding to the experiment on the calibration sample, and obtaining the volume of gas Vg1 discharged through the core sample by the difference between the discharged gas volume Veg2 corresponding to the experiment on the core sample and the discharged gas volume Veg1 corresponding to the experiment on the calibration sample; obtaining the volume of oil Vo2 passing through the core sample by the difference between the injected oil volume Vio2 corresponding to the experiment on the core sample and the injected oil volume Vio1 corresponding to the experiment on the calibration sample, and obtaining the volume of gas Vg2 passing through the core sample by the difference between the injected gas volume Vig2 corresponding to the experiment on the core sample and the injected gas volume Vig1 corresponding to the experiment on the calibration sample; calculating the oil recovery rate in the core sample according to Vo1 / Vo2; and calculating the gas recovery rate in the core sample according to Vg1 / Vg2.

[0094] Among them, the calculation of oil and gas recovery rate can be understood as: the difference between the oil and gas volume produced by the core sample in the experiment and the oil and gas volume produced by the calibration sample in the experiment is the volume of oil and gas produced from the core sample due to pressure reduction. This part of the oil and gas volume has taken into account the change in oil and gas output caused by the pressure reduction in the space outside the sample.

[0095] Taking an example to illustrate, the volumes of oil and gas injected and discharged in the calibration experiment of the calibration sample are recorded to obtain the injected oil volume Vio1, the injected gas volume Vig1, the injected fracturing fluid volume Vif1, the discharged oil volume Veo1, and the discharged gas volume Veg1; experiments are carried out on core samples, and the experimental conditions and procedures are consistent with those of the calibration alloy, and the injected and discharged oil and gas volumes are recorded to obtain the injected oil volume Vio2, the injected gas volume Vig2, the discharged oil volume Veo2, and the discharged gas volume Veg2. Based on the principle of oil and gas recovery rate by depletion production, the oil volume Vo1 discharged from the core sample after the experiment is obtained through Veo2-Veo1, and the oil volume Vo2 in the experimental core sample is obtained through Vio2-Vio1; the gas volume Vg1 discharged from the core sample after the experiment is obtained through Veg2-Veg1; the gas volume Vg2 in the experimental core sample is obtained through Vig2-Vig1; the oil recovery rate in the core sample is obtained by calculation based on Vo1 / Vo2; the gas recovery rate in the core sample is obtained by calculation based on Vg1 / Vg2. Based on this, the recovery rate measurement of depletion production of core samples can be completed.

[0096] The unconventional oil and gas recovery rate measurement method provided by the embodiment of the present invention can accurately obtain unconventional oil and gas recovery rate experimental measurement data based on hydraulic fracturing conditions in the laboratory, so as to predict the unconventional oil and gas recovery rate under different reservoir properties, different oil and gas saturations, and different geological conditions. The experiment for each core sample is divided into two steps: calibration and measurement. First, a calibration experiment is carried out on a calibration sample of the same size and incompressible as the core sample to obtain the injected and excluded oil and gas volumes that exclude the influence of the sample reservoir space. Then, a measurement experiment is carried out on the core sample to obtain the injected and excluded oil and gas volumes. Thus, the injected and discharged oil and gas volumes of the core sample experiment are obtained more accurately, thereby accurately obtaining the oil and gas recovery rate of depletion exploitation. It provides technology and basis for predicting unconventional oil and gas recovery rates, optimizing sweet spots, and formulating reasonable development plans, which is of great significance for promoting experimental basic research and the development of related disciplines. Furthermore, the embodiments of the present invention can not only measure the recovery rate of depletion production of unconventional oil and gas (for example, shale oil, shale gas, tight oil, tight gas, coalbed methane), but can also be applied to the measurement of recovery rate of depletion production of conventional reservoir oil and gas.

[0097] An embodiment of the present invention also provides a control device for measuring unconventional oil and gas recovery rate, the control device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to implement the above-mentioned unconventional oil and gas recovery rate measurement method.

[0098] An embodiment of the present invention further provides a machine-readable storage medium, on which instructions are stored, and the instructions enable a machine to execute the above-mentioned method for measuring unconventional oil and gas recovery rate.

[0099] An embodiment of the present invention further provides an experimental system for measuring unconventional oil and gas recovery rate, wherein the experimental system comprises the above-mentioned experimental device and the above-mentioned control device.

[0100] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0101] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0104] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0105] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0106] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0107] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity or device including the element.

[0108] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. An experimental device for measuring unconventional oil and gas recovery rate, characterized in that: The experimental device includes: A sample holder, including a top, bottom and side panels; A pressure applicator, fixed to the sample holder by a fixture, and used to apply pressure to the sample holder by driving a pressure pump, wherein the pressure applicator comprises a top pressure applicator located at the top of the sample holder, a bottom pressure applicator located at the bottom, and a lateral pressure applicator located at the side; A constant temperature box, wherein the sample holder is located in the constant temperature box; An oil-gas injector connected to the top of the sample holder via an oil-gas injection tube, one end of the oil-gas injection tube being connected to the oil-gas injector and the other end being connected to an injection port of a one-way porous disk, wherein the one-way porous disk is located between the top pressure applicator and the sample holder; A fracturing fluid injector is connected to the bottom of the sample holder through a fracturing fluid injection pipe, one end of the fracturing fluid injection pipe is connected to the fracturing fluid injector, and the other end is connected to the injection port of a two-way porous disc, and the two-way porous disc is located between the bottom pressure applicator and the sample holder; A liquid collector connected to the sample holder via a discharge fluid collection tube, one end of the discharge fluid collection tube being connected to the liquid collector and the other end being connected to a discharge port of the bidirectional porous disc; A gas collector is connected to the liquid collector via a gas collecting pipe.

2. The experimental device for measuring unconventional oil and gas recovery rate according to claim 1, characterized in that: The inner wall of the side of the sample holder is lined with a heat-resistant hard rubber sleeve of preset thickness, and a sample sheath is provided between the heat-resistant hard rubber sleeve and the experimental sample. The sample package is made of a temperature-resistant flexible alloy of a preset thickness, and has an inner side thereof in contact with the experimental sample provided with etching grooves, which are evenly distributed at equal intervals.

3. The experimental device for measuring unconventional oil and gas recovery rate according to claim 1, characterized in that: The pressure applicator is a hollow structure, the outer wall of which is made of a pressure-resistant alloy with a preset thickness, and the inner wall of which is made of an elastic alloy with a preset thickness.

4. The experimental device for measuring unconventional oil and gas recovery rate according to claim 1, characterized in that: The unidirectional porous disk is a double-layer structure, and one side of the layer in contact with the experimental sample has etched grooves distributed in radial, parallel or oblique shapes, and circular holes penetrating the layer are distributed on the etched grooves.

5. The experimental device for measuring unconventional oil and gas recovery rate according to claim 1, characterized in that: The bidirectional porous disc is a double-layer structure, and both layers are provided with etched grooves, which are distributed in radial, parallel or oblique shapes. The etching grooves are provided with circular holes penetrating the corresponding layers, and the etching grooves are distributed correspondingly to the circular holes.

6. The experimental device for measuring unconventional oil and gas recovery rate according to claim 1, characterized in that: The experimental device further includes a pressure sensor and a first reverse valve, wherein the first reverse valve is arranged between the pressure pump and the pressure applicator. The pressure applied to the sample holder is controlled by the pressure pump, the pressure applicator, the pressure sensor and the first reversal valve.

7. The experimental device for measuring unconventional oil and gas recovery rate according to claim 6, characterized in that: The experimental device also includes a second reverse valve and a third reverse valve, The second reverse valve is disposed between the oil and gas injector and the sample holder, and the oil and gas injector, the pressure sensor, and the second reverse valve are used to control the fluid pressure applied to the core sample of the sample holder. The third reverse valve is arranged between the fracturing fluid injector and the sample holder, and the fluid pressure applied to the core sample of the sample holder is controlled through the fracturing fluid injector, the pressure sensor and the third reverse valve.

8. The experimental device for measuring unconventional oil and gas recovery rate according to claim 6, characterized in that: The experimental device also includes a cooling box, and the liquid collector is located in the cooling box.

9. A method for measuring unconventional oil and gas recovery rate based on the experimental device according to any one of claims 1 to 8, characterized in that: The method for measuring the unconventional oil and gas recovery factor includes: After the calibration sample or the core sample is loaded into the sample holder, the following experimental steps are performed on each experimental sample in the calibration sample and the core sample respectively: Driving a pressure applicator through a pressure pump to evacuate the sample holder; Controlling the oil and gas injector to apply a first fluid pressure to the experimental sample according to a preset pressure rate, controlling the fracturing fluid injector to apply a second fluid pressure to the experimental sample according to a preset pressure rate, and controlling the thermostat to heat the experimental sample to a preset temperature point according to a preset heating rate; According to a preset discharge pressure, when the fluid pressure applied to the test sample is reduced to a preset pressure point, a preset volume of oil and a preset volume of gas are controlled to be injected; obtaining a corresponding exhausted oil volume and a corresponding exhausted gas volume; and The oil and gas recovery factor of the core sample is calculated based on the injected oil volume, injected gas volume, discharged oil volume and discharged gas volume corresponding to the two experiments.

10. The method for measuring unconventional oil and gas recovery efficiency according to claim 9, characterized in that: The calibration sample is an alloy sample.

11. The method for measuring unconventional oil and gas recovery efficiency according to claim 9, characterized in that: Before loading the core sample into the sample holder, the method for measuring the unconventional oil and gas recovery rate further includes: The core samples are oil washed and dried.

12. The method for measuring unconventional oil and gas recovery efficiency according to claim 9, characterized in that: Before obtaining the corresponding discharged oil volume and the corresponding discharged gas volume, the method for measuring the unconventional oil and gas recovery factor further includes: Condensate the discharged oil.

13. The method for measuring unconventional oil and gas recovery efficiency according to claim 9, characterized in that: The oil and gas recovery factor of the core sample is calculated based on the injected oil volume, injected gas volume, discharged oil volume and discharged gas volume corresponding to the two experiments, including: The oil volume Vo1 discharged by the core sample is obtained by the difference between the discharged oil volume Veo2 corresponding to the experiment on the core sample and the discharged oil volume Veo1 corresponding to the experiment on the calibration sample, and the gas volume Vg1 discharged by the core sample is obtained by the difference between the discharged gas volume Veg2 corresponding to the experiment on the core sample and the discharged gas volume Veg1 corresponding to the experiment on the calibration sample; The oil volume Vo2 passing through the core sample is obtained by the difference between the injected oil volume Vio2 corresponding to the experiment on the core sample and the injected oil volume Vio1 corresponding to the experiment on the calibration sample; the gas volume Vg2 passing through the core sample is obtained by the difference between the injected gas volume Vig2 corresponding to the experiment on the core sample and the injected gas volume Vig1 corresponding to the experiment on the calibration sample; According to Vo1 / Vo2, the oil recovery rate in the core sample is calculated; and According to Vg1 / Vg2, the recovery rate of gas in the core sample is calculated.

14. A control device for measuring unconventional oil and gas recovery rate, characterized in that: The control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the method for measuring unconventional oil and gas recovery rate according to any one of claims 9-13.

15. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions, which enable the machine to execute the method for measuring unconventional oil and gas recovery rate according to any one of claims 9-13.

16. An experimental system for measuring unconventional oil and gas recovery rate, characterized in that: The experimental system comprises the experimental device described in any one of claims 1 to 8 and the control device described in claim 14.

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