A ground test device and test method for double-pumping short joint of formation tester

Abstract

The present invention discloses a ground test device for a double-pump short section of a formation tester and a test method thereof. The ground test device includes a load simulation module, a double pump station module, a valve circuit assembly, a high-temperature oil tank and a thermal insulation module. The load simulation module simulates the formation pressure to which the formation tester is subjected when pumping fluid; the double pump station module controls the telescopic displacement and speed of the hydraulic cylinder piston, thereby controlling the fluid suction volume and speed; the thermal insulation module is used to restore the underground high-temperature environment. The present invention adopts double-pump parallel control to achieve precise electro-hydraulic control in a wide flow range to meet the needs of formations with different permeabilities, uses a thermal insulation module to achieve underground high-temperature restoration, and can freely select the structural layout according to the temperature resistance of the components. A sleeve-type hydraulic cylinder is used to achieve formation pressure simulation, and the pressure is adjusted by a one-way relief valve. The present invention can provide great help for efficient and safe underground exploration under high temperature and high pressure environments.

Description

Technical Field

[0001] The invention belongs to the field of well logging instrument testing, and in particular relates to a ground testing device for a double-pumping short joint of a formation tester and a testing method thereof. Background Art

[0002] In order to meet the needs of complex oil and gas reservoir exploration and development, the formation evaluation of logging is upgraded to reservoir evaluation, and the formation tester is gradually becoming the most widely used logging instrument. Among them, the formation tester pumping sub is mainly responsible for collecting formation fluid. After completing the logging operation, the formation fluid in the pumping sub will be transferred to laboratory professionals for component analysis, and then determine whether the test formation has the potential for drilling and production. Before the formation tester is put into operation, sufficient ground test tests need to be carried out to ensure its reliability and stability. At present, the ground test device is mainly based on simulating the high temperature and high pressure environment of the well, mainly including high temperature module, high pressure module and formation core module. First, the high temperature module electrically heats the hydraulic oil, and after reaching the set temperature, the hydraulic oil is injected into the simulated wellbore, and the oil is circulated to discharge the air in the wellbore and reach the set temperature value. The high pressure module uses a booster cylinder to increase the working oil circuit pressure to the formation pressure. After the high temperature and high pressure hydraulic oil is passed into the formation core module, the downhole environment simulation can be realized. The wellbore environment simulation device can assist in completing functions such as formation pressure measurement, temperature and pressure resistance tests, etc., provide effective technical support before downhole testing, and reduce the risk of logging instrument downhole testing.

[0003] As exploration and development tends to low-porosity and low-permeability formations, formation testers need to accurately control their fluid suction volume and suction speed to prevent the phenomenon that the suction speed or suction volume does not match the current formation permeability, affecting normal pressure measurement and fluid fidelity. At present, the formation tester pumping short section is driven by a single pump, which makes it difficult to achieve high-flow pumping at high permeability to shorten the operation time, and low-flow pumping at low permeability to accurately control the suction volume. In addition, although the existing ground test device and its testing method can effectively complete the simulation of high-temperature and high-pressure environment, its electro-hydraulic system is complex, occupies a large area, and the device requires a long preheating time, and the temperature and pressure adjustment operation is complicated, which is not conducive to the rapid verification of the control algorithm. At the same time, during the ground test of such devices, the entire electro-hydraulic system needs to remain in operation for a long time to ensure that the temperature and pressure are close to the downhole environment, resulting in unnecessary energy waste during the waiting process of test parameter adjustment and correction. In addition, an overly complex system will greatly increase the initial development cost and the later maintenance cost. Although the multi-module design can better realize component replacement and system update design, the problem of real-time communication and collaboration between modules is not easy to solve. Summary of the invention

[0004] The ground test device and test method for the double-pumping short section of the formation tester proposed in the present invention can just solve the above mentioned contradiction.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention firstly provides a ground test device for a double-pumping short joint of a formation tester, which comprises a load simulation module, a double pump station module, a valve circuit assembly and a high-temperature oil tank;

[0007] The load simulation module simulates the formation pressure of the formation tester when sucking fluid, and includes a sleeve hydraulic cylinder, a first one-way relief valve, a second one-way relief valve and a high-temperature accumulator.

[0008] The dual pump station module controls the hydraulic cylinder piston telescopic displacement and speed, thereby controlling the fluid suction volume and speed; it includes a first high-temperature servo motor, a high-temperature small-displacement pump, a second high-temperature servo motor, and a high-temperature large-displacement pump;

[0009] The valve circuit assembly includes a first oil suction filter, a second oil suction filter, a first check valve, a second check valve, a manual unloading valve, a high-temperature relief valve, a liquid temperature and level gauge, an oil return filter, a first two-position three-way reversing valve, and a second two-position three-way reversing valve;

[0010] The high temperature oil tank is connected to the high temperature small displacement pump through the first oil suction filter, the high temperature small displacement pump outlet is connected to the first check valve, and the high temperature small displacement pump is connected to the first high temperature servo motor through a coupling; the high temperature oil tank is connected to the high temperature large displacement pump through the second oil suction filter, the high temperature large displacement pump outlet is connected to the second check valve, and the high temperature large displacement pump is connected to the second high temperature servo motor through a coupling;

[0011] The outlet of the first one-way valve, the outlet of the second one-way valve, the inlet of the manual unloading valve, the inlet of the high-temperature relief valve, the T port of the first two-position three-way reversing valve, and the T port of the second two-position three-way reversing valve are connected through the oil circuit; the P port of the first two-position three-way reversing valve, the P port of the second two-position three-way reversing valve, the outlet of the high-temperature relief valve, and the outlet of the manual unloading valve are all connected to the high-temperature oil tank through the return oil filter; the A port of the first two-position three-way reversing valve is connected to the first working oil chamber of the sleeve-type hydraulic cylinder, and the A port of the second two-position three-way reversing valve is connected to the second working oil chamber of the sleeve-type hydraulic cylinder; wherein the first load simulation oil chamber of the sleeve-type hydraulic cylinder is connected to the A port of the second one-way relief valve, and the second load simulation oil chamber of the sleeve-type hydraulic cylinder is connected to the A port of the first one-way relief valve; the B port of the first one-way relief valve and the B port of the second one-way relief valve are both connected to the high-temperature accumulator.

[0012] As a preferred solution of the present invention, the ground test device for the double pumping sub of the formation tester also includes a heat preservation module, which is used to restore the underground high temperature environment, and the load simulation module, valve circuit assembly and high temperature oil tank are all arranged in the heat preservation module. Furthermore, the double pump station module is placed in the heat preservation module according to its heat resistance performance; for example, if it can withstand high temperature, it can also be placed in the heat preservation module.

[0013] As a preferred solution of the present invention, the insulation module is a well logging temperature box, and a transparent glass window is installed on the well logging temperature box for observation.

[0014] As a preferred embodiment of the present invention, the sleeve-type hydraulic cylinder includes a load simulation cylinder, a left slide plate, a double-rod hydraulic cylinder and a right slide plate; the load simulation cylinder is fixed on a workbench and is stationary relative to the ground; the cylinder of the double-rod hydraulic cylinder is welded in the load simulation cylinder and remains relatively stationary; the left extension rod of the double-rod hydraulic cylinder is welded on the left slide plate, and the right extension rod is welded on the right slide plate; the left slide plate and the right slide plate can slide in the load simulation cylinder.

[0015] As a preferred solution of the present invention, the valve circuit assembly and the first one-way relief valve, the second one-way relief valve, and the high-temperature accumulator are integrated into a valve block, and the valve block is arranged in the insulation module.

[0016] The present invention also provides a test method based on the above-mentioned ground test device for double-pumping short joint of formation tester:

[0017] When the formation permeability is low, only the first high-temperature servo motor drives the high-temperature small-displacement pump to work; when the formation permeability is moderate, only the second high-temperature servo motor drives the high-temperature large-displacement pump to work; when the formation permeability is high, the high-temperature small-displacement pump and the high-temperature large-displacement pump work at the same time;

[0018] When the sleeve hydraulic cylinder moves to the right, the first two-position three-way reversing valve is switched to the left position, and the second two-position three-way reversing valve is still in the right position; the high-pressure oil at the outlets of the first check valve and the second check valve enters the first working oil chamber of the sleeve hydraulic cylinder through the TA port of the first two-position three-way reversing valve, and the oil in the second working oil chamber of the sleeve hydraulic cylinder returns to the high-temperature oil tank through the AP port of the second two-position three-way reversing valve; the high-pressure oil enters the first working oil chamber of the sleeve hydraulic cylinder, the cylinder barrel of the double-rod hydraulic cylinder remains stationary, and the extension rod moves to the right, driving the left sliding The right plate and the right slide plate move to the right; under the pulling and pressing action of the slide plate, the volume of the first load simulation oil chamber of the sleeve type hydraulic cylinder increases, and the oil is supplemented by the high temperature accumulator through the second one-way relief valve; while the volume of the second load simulation oil chamber decreases, and the oil flows into the high temperature accumulator through the first one-way relief valve; at this time, the oil pressure of the first load simulation oil chamber of the sleeve type hydraulic cylinder is the set pressure of the high temperature accumulator, and the oil pressure of the second load simulation oil chamber is the set pressure of the one-way relief valve, that is, the one-way load simulation of the sleeve type hydraulic cylinder is realized;

[0019] When the barrel-type hydraulic cylinder moves to the left, the first two-position three-way reversing valve is switched to the right position, and the second two-position three-way reversing valve is in the left position; the high-pressure oil at the outlet of the first one-way valve and the second one-way valve enters the second working oil chamber of the sleeve-type hydraulic cylinder through the TA port of the second two-position three-way reversing valve, and the oil in the first working oil chamber of the sleeve-type hydraulic cylinder returns to the high-temperature oil tank through the AP port of the first two-position three-way reversing valve.

[0020] The ground test device and test method for the double-pump short section of the formation tester proposed in the present invention focus on the core function of the formation tester: fluid suction. This function mainly relies on the pressure flow control of the piston cylinder to ensure that the fluid suction can be carried out at a constant rate. The introduction of this set of ground test equipment brings the following basic advantages: First, the pressure load simulation and actuator are integrated in the sleeve hydraulic cylinder to realize single pump source drive, and the logging-specific temperature box is used to provide a high-temperature environment for the entire test device, which greatly reduces the complexity of the ground test; second, it is equipped with a parallel double pump station with a wide displacement range, which can adapt to different formation permeabilities for high-precision flow control. The ground test device proposed in the present invention can realize the rapid verification of logging principles and control strategies, and the test efficiency and energy utilization are greatly improved. In addition, the components selected in the present invention are selected and designed with reference to the actual downhole size restrictions, effectively restoring the actual working state of the downhole hydraulic system. At the same time, the present invention has good expansibility, can realize the quick disassembly and replacement of hydraulic components, is convenient for carrying newly developed micro hydraulic components for performance verification, and has good application prospects in the optimization design and performance regulation of the electro-hydraulic system of the formation tester. In summary, it has great application potential in achieving high-precision and high-reliability fluid suction for the formation tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the hydraulic system of a ground test device for a double-pumping nipple of a formation tester;

[0022] Figure 2 It is the structural diagram of the sleeve type hydraulic cylinder;

[0023] Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 All of them are structural layout diagrams of the ground test device for the double-pumping short section of the formation tester of the present invention.

[0024] 1-high temperature oil tank; 2-first oil suction filter; 3-second oil suction filter; 4-first high temperature servo motor; 5-high temperature small displacement pump; 6-second high temperature servo motor; 7-high temperature large displacement pump; 8-first one-way valve; 9-second one-way valve; 10-manual unloading valve; 11-high temperature relief valve; 12-liquid temperature and level gauge; 13-return oil filter; 14-first two-position three-way reversing valve; 15-second two-position three-way reversing valve; 16-sleeve type hydraulic cylinder; 17-first one-way relief valve; 18-second one-way relief valve; 19-high temperature accumulator; 101-double pump station; 102-high temperature oil tank; 103-valve block; 104-sleeve type hydraulic cylinder; 105-well logging temperature box; 161-load simulation cylinder; 162-left slide; 163-double-rod hydraulic cylinder; 164-right slide. DETAILED DESCRIPTION

[0025] The present invention is further described and illustrated below in conjunction with specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0026] like Figure 1 As shown, the present invention provides a ground test device for a double-pumping short section of a formation tester, which includes a load simulation module, a double pump station module, a valve circuit assembly and a high-temperature oil tank 1;

[0027] The load simulation module simulates the formation pressure of the formation tester when pumping fluid, and includes a sleeve hydraulic cylinder 16, a first one-way relief valve 17, a second one-way relief valve 18 and a high-temperature accumulator 19.

[0028] The dual pump station module controls the hydraulic cylinder piston telescopic displacement and speed, and thus controls the fluid suction volume and speed; it includes a first high-temperature servo motor 4, a high-temperature small-displacement pump 5, a second high-temperature servo motor 6, and a high-temperature large-displacement pump 7;

[0029] The valve circuit assembly includes a first oil suction filter 2, a second oil suction filter 3, a first non-return valve 8, a second non-return valve 9, a manual unloading valve 10, a high-temperature relief valve 11, a liquid temperature and level gauge 12, an oil return filter 13, a first two-position three-way reversing valve 14, and a second two-position three-way reversing valve 15;

[0030] The high temperature oil tank is connected to the high temperature small displacement pump through the first oil suction filter, the high temperature small displacement pump outlet is connected to the first check valve, and the high temperature small displacement pump is connected to the first high temperature servo motor through a coupling; the high temperature oil tank is connected to the high temperature large displacement pump through the second oil suction filter, the high temperature large displacement pump outlet is connected to the second check valve, and the high temperature large displacement pump is connected to the second high temperature servo motor through a coupling;

[0031] The outlet of the first check valve, the outlet of the second check valve, the inlet of the manual unloading valve, the inlet of the high-temperature relief valve, the T port of the first two-position three-way reversing valve, and the T port of the second two-position three-way reversing valve are connected through the oil circuit; the P port of the first two-position three-way reversing valve, the P port of the second two-position three-way reversing valve, the outlet of the high-temperature relief valve, and the outlet of the manual unloading valve are all connected to the high-temperature oil tank through the return oil filter; the A port of the first two-position three-way reversing valve is connected to the first working oil chamber of the sleeve-type hydraulic cylinder (the first working oil chamber is Figure 1 and 2 The A port of the second two-position three-way reversing valve is connected to the second working oil chamber of the sleeve hydraulic cylinder (the second working oil chamber is Figure 1 and 2 The first load simulation oil chamber of the sleeve hydraulic cylinder ( Figure 1 and 2 The C chamber in the middle is connected to the A port of the second one-way relief valve, and the second load simulation oil chamber ( Figure 1 and 2 The middle D cavity) is connected to the A port of the first one-way relief valve; the B port of the first one-way relief valve and the B port of the second one-way relief valve are both connected to the high-temperature accumulator.

[0032] The A port of the first two-position three-way reversing valve is connected to the A chamber of the sleeve-type hydraulic cylinder, and the A port of the second two-position three-way reversing valve is connected to the B chamber of the sleeve-type hydraulic cylinder; wherein the C chamber of the sleeve-type hydraulic cylinder is connected to the A port of the second one-way relief valve, and the D chamber of the sleeve-type hydraulic cylinder is connected to the A port of the first one-way relief valve; the B port of the first one-way relief valve and the B port of the second one-way relief valve are both connected to the high-temperature accumulator.

[0033] In order to simulate the real underground environment and equipment status as much as possible, all hydraulic components in the present invention are designed and selected according to the actual size limitations of underground operations.

[0034] The present invention takes the rightward movement of the sleeve hydraulic cylinder 16 as an example to illustrate the working principle. First, the first two-position three-way reversing valve 14 is switched to the left position, and the second two-position three-way reversing valve 15 is still in the right position. When the formation permeability is relatively low, the first high-temperature servo motor 4 drives the high-temperature small-displacement pump 5 to work. When the formation permeability is moderate, the second high-temperature servo motor 6 drives the high-temperature large-displacement pump 7 to work. When the formation permeability is relatively high, the high-temperature small-displacement pump 5 and the high-temperature large-displacement pump 7 work at the same time. The above three different formation permeabilities correspond to high-precision pump control strategies under different flow ranges. At this time, the high-pressure oil at the outlet of the dual pump station enters the A chamber of the sleeve hydraulic cylinder 16 through the TA port of the first two-position three-way reversing valve 14, and the oil in the B chamber of the sleeve hydraulic cylinder 16 returns to the high-temperature oil tank 1 through the AP port of the second two-position three-way reversing valve 15.

[0035] The structure diagram of the sleeve type hydraulic cylinder 16 designed for the double pumping short section of the formation tester is as follows: Figure 2 As shown. It mainly includes a load simulation cylinder 161, a left slide 162, a double-rod hydraulic cylinder 163 and a right slide 164. The load simulation cylinder 161 is fixed on the workbench and is stationary relative to the ground. The cylinder of the double-rod hydraulic cylinder 163 is welded in the load simulation cylinder 161 and remains relatively stationary. The left extension rod of the double-rod hydraulic cylinder 163 is welded on the left slide 162, and the right extension rod is welded on the right slide 164. The left slide 162 and the right slide 164 can slide in the load simulation cylinder 161. At this time, if high-pressure oil is passed into the A chamber of the sleeve hydraulic cylinder 16, the cylinder of the double-rod hydraulic cylinder 163 remains stationary, and the extension rod moves to the right, driving the left slide 162 and the right slide 164 to move to the right. Under the pulling and pressing action of the slide, the volume of the C chamber of the sleeve hydraulic cylinder 16 increases, and the oil is replenished by the high-temperature accumulator 19 through the second one-way relief valve 18. The volume of the D chamber is reduced, and the oil flows into the high-temperature accumulator 19 through the first one-way relief valve 17. At this time, the oil pressure of the C chamber of the sleeve hydraulic cylinder 16 is the set pressure of the high-temperature accumulator 19 (generally set to the tank pressure), and the oil pressure of the D chamber is the set pressure of the one-way relief valve, that is, the one-way load simulation of the sleeve hydraulic cylinder 16 is realized.

[0036] like Figure 3-7 As shown, the present invention further provides a schematic structural layout diagram of a ground test device for double pumping short joints of a formation tester; it mainly includes a double pump station 101, a high temperature oil tank 102, a valve block 103, a sleeve type hydraulic cylinder 104, and a well logging temperature box 105. Among them, Figure 3-7 The double pump station 101 Figure 1 The dual pump station module in Figure 3-7 The sleeve type hydraulic cylinder 104 is Figure 1 The sleeve type hydraulic cylinder 16, Figure 3-7 The high temperature oil tank 102 in Figure 1The high temperature oil tank 1, Figure 3-7 The valve block 103 integrates the first oil suction filter 2, the second oil suction filter 3, the first one-way valve 8, the second one-way valve 9, the manual unloading valve 10, the high-temperature relief valve 11, the liquid temperature and level gauge 12, the oil filter 13, the first two-position three-way reversing valve 14, the second two-position three-way reversing valve 15, the first one-way relief valve 17, the second one-way relief valve 18, and the high-temperature accumulator 19, and the logging temperature box 105 serves as an insulation module.

[0037] In order to simulate the underground high temperature environment, the present invention places the high temperature oil tank 102, valve block 103 and sleeve type hydraulic cylinder 104 in the well logging temperature box 105 (the pump station can choose whether to place it in the well logging temperature box according to the actual temperature resistance performance of the components, and the present invention does not limit the arrangement of the pump station). A transparent glass window is installed on the front of the well logging temperature box 105 to observe the internal test conditions. The dual pump station 101 and the oil tank 102 and valve block 103 are all arranged through the holes on the back of the well logging temperature box 105 for pipeline arrangement.

[0038] The ground test device for the double pumping short joint of the formation tester proposed by the present invention has three working states: small flow pump control test mode, medium flow pump control test mode and large flow pump control test mode. Before the formal ground test, the test device needs to be adjusted according to the parameters of the specific simulation test (including flow, pressure and temperature). First, the preset temperature value of the logging temperature box 105 is set according to the temperature requirement, and then the preset pressure values ​​of the first one-way relief valve 17 and the second one-way relief valve 18 are set according to the pressure requirement. Finally, the pump control test mode is set according to the permeability requirement.

[0039] The present invention utilizes a sleeve-type hydraulic cylinder to realize formation pressure simulation, and the pressure is adjusted by a one-way relief valve; the present invention utilizes a special temperature box for well logging to realize downhole high-temperature reduction, and the structural layout can be freely selected according to the temperature resistance of the components; the present invention adopts dual-pump parallel control to realize precise electro-hydraulic control in a wide flow range to meet the needs of formations with different permeabilities.

[0040] The present invention realizes precise electro-hydraulic control in a wide flow range by means of dual-pump parallel control, meeting the requirements of formation fluid suction volume and speed under different formation permeabilities. The present invention simulates the formation pressure by means of a sleeve-type hydraulic cylinder, realizing the integrated design of the actuator and the load simulation device. In addition, the present invention realizes downhole high-temperature simulation by means of a dedicated temperature box for well logging, which greatly reduces the volume of the ground experimental device, reduces the complexity of the electro-hydraulic control system, and reduces unnecessary energy loss, while effectively ensuring the principle verification of the fluid suction of the formation tester and the deployment of the control algorithm. At the same time, the components selected in the present invention are selected and designed with reference to the actual downhole size restrictions, effectively restoring the working state of the real hydraulic system downhole, and also providing excellent expansion space for the performance verification of new micro-hydraulic components and electro-hydraulic systems. The present invention provides a good experimental basis for the ground performance test of the formation tester, and provides great help for efficient and safe downhole exploration under high temperature and high pressure environments.

[0041] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A ground test device for a double-pumping short section of a formation tester, characterized in that: It includes a load simulation module, a dual pump station module, a valve circuit assembly and a high-temperature oil tank (1); The load simulation module simulates the formation pressure exerted on the formation tester when sucking fluid, and comprises a sleeve-type hydraulic cylinder (16), a first one-way relief valve (17), a second one-way relief valve (18) and a high-temperature accumulator (19); The sleeve-type hydraulic cylinder (16) comprises a load simulation cylinder barrel (161), a left slide plate (162), a double-rod hydraulic cylinder (163) and a right slide plate (164); the load simulation cylinder barrel (161) is fixed on a workbench and is stationary relative to the ground; the cylinder barrel of the double-rod hydraulic cylinder (163) is welded inside the load simulation cylinder barrel (161) and remains relatively stationary; the left extension rod of the double-rod hydraulic cylinder (163) is welded to the left slide plate (162), and the right extension rod is welded to the right slide plate (164); the left slide plate (162) and the right slide plate (164) can slide in the load simulation cylinder (161); wherein the left chamber of the left slide plate (162) is the first load simulation oil chamber; the chamber between the left slide plate (162) and the double-rod hydraulic cylinder (163) is the first working oil chamber, the chamber between the right slide plate (164) and the double-rod hydraulic cylinder (163) is the second working oil chamber, and the right chamber of the right slide plate (164) is the second load simulation oil chamber; The dual pump station module controls the hydraulic cylinder piston telescopic displacement and speed, thereby controlling the fluid suction volume and speed; it comprises a first high-temperature servo motor (4), a high-temperature small-displacement pump (5), a second high-temperature servo motor (6), and a high-temperature large-displacement pump (7); The valve circuit assembly comprises a first oil suction filter (2), a second oil suction filter (3), a first non-return valve (8), a second non-return valve (9), a manual unloading valve (10), a high-temperature relief valve (11), a liquid temperature and level gauge (12), an oil return filter (13), a first two-position three-way reversing valve (14), and a second two-position three-way reversing valve (15); The high temperature oil tank is connected to the high temperature small displacement pump through the first oil suction filter, the high temperature small displacement pump outlet is connected to the first check valve, and the high temperature small displacement pump is connected to the first high temperature servo motor through a coupling; the high temperature oil tank is connected to the high temperature large displacement pump through the second oil suction filter, the high temperature large displacement pump outlet is connected to the second check valve, and the high temperature large displacement pump is connected to the second high temperature servo motor through a coupling; The outlet of the first one-way valve, the outlet of the second one-way valve, the inlet of the manual unloading valve, the inlet of the high-temperature relief valve, the T port of the first two-position three-way reversing valve, and the T port of the second two-position three-way reversing valve are connected through an oil circuit; the P port of the first two-position three-way reversing valve, the P port of the second two-position three-way reversing valve, the outlet of the high-temperature relief valve, and the outlet of the manual unloading valve are all connected to the high-temperature oil tank through an oil return filter; the A port of the first two-position three-way reversing valve is connected to the first working oil chamber of the sleeve-type hydraulic cylinder, and the A port of the second two-position three-way reversing valve is connected to the second working oil chamber of the sleeve-type hydraulic cylinder; wherein the first load simulation oil chamber of the sleeve-type hydraulic cylinder is connected to the A port of the second one-way relief valve, and the second load simulation oil chamber of the sleeve-type hydraulic cylinder is connected to the A port of the first one-way relief valve; the B port of the first one-way relief valve and the B port of the second one-way relief valve are both connected to the high-temperature accumulator.

2. The ground test device for double pumping short joint of formation tester according to claim 1, characterized in that It also includes a heat preservation module, which is used to restore the high-temperature environment underground. The load simulation module, the valve circuit component and the high-temperature oil tank are all arranged in the heat preservation module.

3. The ground test device for double pumping short joint of formation tester according to claim 2, characterized in that The dual pump station module is placed in the insulation module based on its temperature resistance.

4. The ground test device for double pumping short joint of formation tester according to claim 2, characterized in that: The insulation module is a well logging temperature box, and a transparent glass window is installed on the well logging temperature box for observation.

5. The ground test device for double pumping short joint of formation tester according to claim 2, characterized in that: The valve circuit assembly, the first one-way relief valve (17), the second one-way relief valve (18), and the high-temperature accumulator (19) are integrated into a valve block (103), and the valve block (103) is arranged in the heat preservation module.

6. A test method for a ground test device for a double pumping sub for a formation tester based on any one of claims 1 to 5, characterized in that: When the formation permeability is low, only the first high-temperature servo motor drives the high-temperature small-displacement pump to work; when the formation permeability is moderate, only the second high-temperature servo motor drives the high-temperature large-displacement pump to work; when the formation permeability is high, the high-temperature small-displacement pump and the high-temperature large-displacement pump work at the same time; When the sleeve hydraulic cylinder moves to the right, the first two-position three-way reversing valve switches to the left position, and the second two-position three-way reversing valve remains in the right position; the high-pressure oil at the outlet of the first one-way valve (8) and the second one-way valve (9) enters the first working oil chamber of the sleeve hydraulic cylinder through the TA port of the first two-position three-way reversing valve, and the oil in the second working oil chamber of the sleeve hydraulic cylinder returns to the high-temperature oil tank through the AP port of the second two-position three-way reversing valve; the high-pressure oil enters the first working oil chamber of the sleeve hydraulic cylinder, the cylinder barrel of the double-rod hydraulic cylinder remains stationary, and the extension rod moves to the right, with The left and right slide plates are moved to the right; under the pulling and pressing action of the slide plates, the volume of the first load simulation oil chamber of the sleeve hydraulic cylinder increases, and the oil is replenished by the high-temperature accumulator through the second one-way relief valve; while the volume of the second load simulation oil chamber decreases, and the oil flows into the high-temperature accumulator through the first one-way relief valve; at this time, the oil pressure of the first load simulation oil chamber of the sleeve hydraulic cylinder is the set pressure of the high-temperature accumulator, and the oil pressure of the second load simulation oil chamber is the set pressure of the one-way relief valve, that is, the one-way load simulation of the sleeve hydraulic cylinder is realized; When the barrel-type hydraulic cylinder moves to the left, the first two-position three-way reversing valve is switched to the right position, and the second two-position three-way reversing valve is in the left position; the high-pressure oil at the outlets of the first one-way valve (8) and the second one-way valve (9) enters the second working oil chamber of the sleeve-type hydraulic cylinder through the TA port of the second two-position three-way reversing valve, and the oil in the first working oil chamber of the sleeve-type hydraulic cylinder returns to the high-temperature oil tank through the AP port of the first two-position three-way reversing valve.

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