A vacuum oil injection device and its usage method

Abstract

The present invention relates to the field of logging instruments, and particularly to a vacuum oil injection device and a usage method thereof, which include an oil injection nipple, a formation tester probe, a vacuum intermediate container, a vacuum device, and a hydraulic oil container. One end of the oil injection nipple is connected to a hydraulic power device, and the other end is connected to the formation tester probe. The vacuum device includes a vacuum drive motor and a vacuum intermediate container. An inlet oil filter is provided between the vacuum intermediate container and the hydraulic oil container. The present invention uses the oil injection nipple and the vacuum device to complete the work of vacuum pumping, hydraulic oil filtration and perfusion. The use of the inlet oil filter can improve the oil injection effect and the cleanliness of the hydraulic oil of the modular formation tester probe and the hydraulic power device, making the modular formation tester probe and the hydraulic power device work reliably under high temperature and high pressure conditions.

Description

Technical Field

[0001] The present invention relates to the field of logging instruments, and particularly to a vacuum oil injection device and a usage method thereof. Background Art

[0002] For current modular formation tester probes and hydraulic power units, it is not easy to fill the hydraulic oil completely, and the injected hydraulic oil is not clean, resulting in poor sealing of the hydraulic valve and blockage of the filter screen, and the hydraulic system works unreliably.

[0003] In order to improve the oil injection effect and the cleanliness of the hydraulic oil for modular formation tester probes and hydraulic power units, a vacuum oil injection device is designed. Summary of the Invention

[0004] Aiming at the limitations of incomplete oil injection and unclean injected hydraulic oil in the prior art, the present invention provides a vacuum oil injection device and a usage method, which can achieve a device and method for filling the hydraulic oil completely and injecting it cleanly, so that the modular formation tester probe and the hydraulic power unit work reliably under high temperature and high pressure conditions.

[0005] The present invention is realized through the following technical solutions:

[0006] A vacuum oil injection device includes an oil injection nipple, a formation tester probe, a vacuum intermediate container, a vacuum device, and a hydraulic oil container. One end of the oil injection nipple is connected to the hydraulic power unit, and the other end is connected to the formation tester probe. The vacuum device includes a vacuum drive motor and a vacuum intermediate container. The vacuum intermediate container is connected to the oil injection nipple, and both the vacuum drive motor and the hydraulic oil container are connected to the vacuum intermediate container. A hydraulic oil inlet filter is provided between the vacuum intermediate container and the hydraulic oil container.

[0007] Preferably, the oil injection nipple includes a main oil path and a return oil path, and the main oil path is in parallel with the return oil path. One end of the main oil path and one end of the return oil path are connected to the hydraulic power unit, and the other end of the main oil path and the other end of the return oil path are both connected to the formation tester probe. A first valve group is provided between the main oil path and the vacuum intermediate container, and a second valve group is provided between the return oil path and the vacuum intermediate container. Both the first valve group and the second valve group are used to control the hydraulic oil. After the main oil path and the return oil path are in parallel, they are connected to the vacuum intermediate container through a vacuum stop valve.

[0008] Preferably, the first valve group includes a check valve for the main oil path valve group, a main oil path inlet filter, and a main oil path stop valve. The check valve for the main oil path valve group is in series with the main oil path inlet filter, and both the check valve for the main oil path valve group and the main oil path inlet filter are in parallel with the main oil path stop valve.

[0009] Preferably, the second valve group includes a check valve for the oil return circuit, a filter for the oil inlet of the oil return circuit, and a stop valve for the oil return circuit. The check valve for the oil return circuit is connected in series with the main oil return inlet filter, and both the check valve for the oil return circuit and the filter for the oil inlet of the oil return circuit are connected in parallel with the stop valve for the oil return circuit.

[0010] Preferably, the vacuum pumping drive includes a hydraulic oil circulation pump and a vacuum pump. The hydraulic oil circulation pump is connected between the vacuum pumping intermediate container and the main oil circuit through a stop valve at the outlet of the hydraulic oil circulation pump, and the vacuum pump is connected to the vacuum pumping intermediate container through a stop valve at the inlet of the vacuum pump.

[0011] Preferably, an oil circulation circuit isolation stop valve is further provided between the hydraulic oil circulation pump and the main oil circuit.

[0012] Preferably, a stop valve for the inlet of the vacuum pumping intermediate container is provided between the hydraulic oil container and the vacuum pumping intermediate container.

[0013] Preferably, the capacity of the vacuum pumping intermediate container is larger than the capacity of the inner cavity of the hydraulic power device.

[0014] Preferably, a vacuum gauge is provided on the vacuum pumping intermediate container.

[0015] A method for using a vacuum pumping and oil injection device, using the vacuum pumping and oil injection device, includes the following steps:

[0016] 1) Turn on the vacuum pumping drive, perform vacuum pumping on the vacuum pumping intermediate container, so that the hydraulic oil in the hydraulic oil container enters the vacuum pumping intermediate container, and then turn off the vacuum pumping drive to complete the oil suction process;

[0017] 2) Turn on the vacuum pumping drive and perform vacuum pumping on the hydraulic power device, the oil injection nipple, and the formation tester probe;

[0018] 3) Inject hydraulic oil into the hydraulic power device, the oil injection nipple, and the formation tester probe;

[0019] 4) Pressurize and fill the system composed of the hydraulic power device, the oil injection nipple, and the formation tester probe with oil, so that the balance cylinder of the instrument is filled with hydraulic oil.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The vacuum pumping and oil injection device of the present invention uses the oil injection nipple and the vacuum pumping device to complete the work of vacuum pumping and hydraulic oil filtration and perfusion. The use of the inlet filter can improve the oil injection effect and the cleanliness of the hydraulic oil of the modular formation tester probe and the hydraulic power device, making the modular formation tester probe and the hydraulic power device work reliably under high-temperature and high-pressure conditions.

[0022] Further, the main oil circuit and the return oil circuit, in conjunction with the first valve group and the second valve group, can achieve the transportation and movement of hydraulic oil.

[0023] Further, the vacuum gauge is for facilitating personnel to detect and observe the sealing performance of the system, ensuring the normal operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a vacuum pumping and oil injection device of the present invention.

[0025] Figure 2 is a schematic diagram of a combination valve and a filter in a vacuum pumping and oil injection device of the present invention.

[0026] In the figure, 1. Return oil circuit stop valve; 2. Main oil circuit stop valve; 3. Vacuum pumping stop valve; 4. Vacuum pumping intermediate container inlet stop valve; 5. Hydraulic oil circulation pump outlet stop valve; 6. Vacuum pump inlet stop valve; 7. Oil circulation circuit isolation stop valve; 8. Hydraulic oil inlet pipe; 9. Hydraulic oil inlet filter; 10. Return oil circuit inlet filter; 11. Main oil circuit inlet filter; 12. Main oil circuit valve group interface; 13. Return oil circuit valve group interface; 14. Main oil circuit valve group check valve; 15. Return oil circuit valve group check valve; 16. Hydraulic power unit; 17. Formation tester probe; 18. Vacuum pumping intermediate container; 19. Vacuum pump; 20. Hydraulic oil circulation pump; 21. Unfiltered hydraulic oil; 22. Filtered hydraulic oil; 23. Oil injection nipple; 24. Vacuum pumping device; 25. Oil injection nipple body; 26. Vacuum gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further elaborates on the present invention in detail with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0028] The present invention discloses a vacuum pumping and oil injection device. Referring to Figure 1 , it includes an oil injection nipple 23, a formation tester probe 17, a vacuum pumping device 24, and a hydraulic oil container. One end of the oil injection nipple 23 is connected to the hydraulic power unit 16, and the other end is connected to the formation tester probe 17. The vacuum pumping device 24 includes a vacuum pumping drive and a vacuum pumping intermediate container 18, and the vacuum pumping intermediate container 18 is connected to the oil injection nipple 23.

[0029] The hydraulic power unit 16, the oil injection nipple 23, and the formation tester probe 17 are integrated. Referring to Figure 1 , pipelines are used to connect the main oil circuit valve group interface 12, the return oil circuit valve group interface 13, and the vacuum pumping device 24 into a closed-loop system, making each connection joint sealed reliably without leakage.

[0030] The oil injection sub - joint 23 includes a main oil circuit and a return oil circuit. The main oil circuit and the return oil circuit are arranged in parallel inside the body 25 of the oil injection sub - joint. One end of the main oil circuit and the return oil circuit is connected to the hydraulic power device 16 through a connecting pipeline, and the other end is connected to the formation tester probe 17; the vacuum - pumping intermediate container 18 is connected to the oil injection sub - joint through a connecting pipeline.

[0031] Refer to Figure 2 , a first valve group is provided between the main oil circuit and the vacuum - pumping intermediate container 18. The first valve group includes a check valve 14 for the main oil - circuit valve group, a filter 11 for the main - oil - circuit inlet, and a stop valve 2 for the main oil circuit. The check valve 14 for the main oil - circuit valve group is in series with the filter 11 for the main - oil - circuit inlet, and both the check valve 14 for the main oil - circuit valve group and the filter 11 for the main - oil - circuit inlet are in parallel with the stop valve 2 for the main oil circuit.

[0032] A second valve group is provided between the return oil circuit and the vacuum - pumping intermediate container 18. The second valve group includes a check valve 15 for the return - oil - circuit valve group, a filter 10 for the return - oil - circuit inlet, and a stop valve 1 for the return oil circuit. The check valve 15 for the return - oil - circuit valve group is in series with the filter 10 for the return - oil - circuit inlet, and both the check valve 15 for the return - oil - circuit valve group and the filter 10 for the return - oil - circuit inlet are in parallel with the stop valve 1 for the return oil circuit. Both the first valve group and the second valve group are used to control the hydraulic oil.

[0033] After the main oil circuit and the return oil circuit are in parallel, they are connected to the vacuum - pumping intermediate container 18 through a vacuum - pumping stop valve 3.

[0034] An oil - circulation - circuit isolation stop valve 7 is also provided on the main oil circuit.

[0035] The vacuum - pumping drive is connected to the vacuum - pumping intermediate container 18. The vacuum - pumping drive includes a hydraulic - oil circulation pump 20 and a vacuum pump 19. The hydraulic - oil circulation pump 20 is connected between the vacuum - pumping intermediate container 18 and the main oil circuit through a hydraulic - oil - circulation - pump outlet stop valve 5.

[0036] The vacuum pump 19 is connected to the vacuum - pumping intermediate container 18 through a vacuum - pump inlet stop valve 6.

[0037] A hydraulic - oil inlet filter 9 and a vacuum - pumping - intermediate - container inlet stop valve 4 are provided between the hydraulic - oil container and the vacuum - pumping intermediate container 18.

[0038] The capacity of the vacuum - pumping intermediate container 18 is larger than the capacity of the inner cavity of the hydraulic power device 16. In this embodiment, the capacity of the vacuum - pumping intermediate container 18 is four times that of the inner cavity of the hydraulic power device 16.

[0039] A vacuum gauge 26 is provided on the vacuum - pumping intermediate container 18. The vacuum gauge 26 is for facilitating personnel to detect and observe the sealing performance of the system and ensuring the normal operation of the entire system.

[0040] The present invention also discloses a method for using a vacuum oil injection device. Using the vacuum oil injection device, the method includes the following steps:

[0041] 1) Turn on the vacuum pump drive to perform vacuum pumping on the intermediate vacuum container 18, so that the hydraulic oil in the hydraulic oil container enters the intermediate vacuum container 18 to complete the oil suction process;

[0042] Close the vacuum cut-off valve 3 and the outlet cut-off valve 5 of the hydraulic oil circulation pump; open the inlet cut-off valve 6 of the vacuum pump, the inlet cut-off valve 4 of the intermediate vacuum container, insert the hydraulic oil inlet pipe 8 into the unfiltered hydraulic oil, connect the motor power supply of the vacuum pump 19, so that the vacuum pump 19 starts to pump vacuum, a vacuum is formed in the intermediate vacuum container 18, and the unfiltered hydraulic oil 21 enters the intermediate vacuum container 18 under the action of atmospheric pressure through the hydraulic oil inlet filter 9 and the inlet cut-off valve 4 of the intermediate vacuum container. When the hydraulic oil 22 after the first filtration reaches half of the capacity of the intermediate vacuum container 18, close the inlet cut-off valve 4 of the intermediate vacuum container and the motor power supply of the vacuum pump 19, and the oil suction work is completed.

[0043] 2) Turn on the vacuum pump drive to perform vacuum pumping on the hydraulic power unit 16, the oil injection nipple 23, and the formation tester probe 17;

[0044] Close the inlet cut-off valve 4 of the intermediate vacuum container and the outlet cut-off valve 5 of the hydraulic oil circulation pump; open the oil circulation loop isolation cut-off valve 7, the main oil circuit cut-off valve 2, the return oil circuit cut-off valve 1, the vacuum cut-off valve 3, the outlet cut-off valve 5 of the hydraulic oil circulation pump, the inlet cut-off valve 6 of the vacuum pump, the oil circulation loop isolation cut-off valve 7, connect the motor power supply of the vacuum pump 19, the vacuum pump starts to pump vacuum, and the hydraulic power unit 16, the oil injection nipple 23, the formation tester probe 17, the vacuum device 24 and the connecting pipeline form a system for vacuum pumping;

[0045] After the vacuum pump 19 works for a few minutes, close the inlet cut-off valve 6 of the vacuum pump. Observe the vacuum gauge 26 connected to the intermediate vacuum container 18. If the pointer changes within five minutes, it means that the entire vacuum pumping system is not well sealed and there is a leakage point in the system. Search for the leakage point and handle it until it is fixed; if the pointer does not move, it means that the entire vacuum pumping system is well sealed and there is no leakage;

[0046] The inlet cut-off valve 6 of the vacuum pump can be reopened to continue vacuum pumping. Continuously pump vacuum for more than four hours, and the system composed of the hydraulic power unit 16, the oil injection nipple 23, the formation tester probe 17, the vacuum device 24 and the connecting pipeline and the hydraulic oil 22 after the first filtration in the intermediate vacuum container 18 complete the vacuum pumping work together.

[0047] 3) Inject hydraulic oil into the hydraulic power unit 16, the oil injection nipple 23, and the formation tester probe 17;

[0048] Close the shut-off valves of the oil circulation circuit 7, the main oil circuit shut-off valve 2, the return oil circuit shut-off valve 1, the vacuum extraction shut-off valve 3, and the inlet shut-off valve of the vacuum pump 6; Take out the hydraulic oil inlet pipe 8 from the unfiltered hydraulic oil surface and place it in the atmosphere; Open the inlet shut-off valve of the vacuum extraction intermediate container 4, the outlet shut-off valve of the hydraulic oil circulation pump 5, and the shut-off valve of the oil circulation circuit 7; There is an atmospheric pressure on the surface of the once-filtered hydraulic oil 22 in the vacuum extraction intermediate container 18. Under the action of the atmospheric pressure, the once-filtered hydraulic oil 22 passes through the outlet shut-off valve of the hydraulic oil circulation pump 5, the inlet filter of the main oil circuit 11 for re-filtering, and the check valve 14 of the main oil circuit valve group to enter the hydraulic power unit 16, the injection nipple 23, and the main oil circuit of the formation tester probe 17 to enter the instrument cavity.

[0049] At the same time, under the action of the atmospheric pressure, the once-filtered hydraulic oil 22 passes through the outlet shut-off valve of the hydraulic oil circulation pump 5, the shut-off valve of the oil circulation circuit 7, the inlet filter of the return oil circuit 10 for re-filtering, and the check valve 15 of the return oil circuit valve group to enter the hydraulic power unit 16, the injection nipple 23, and the return oil circuit of the formation tester probe 17 to enter the instrument cavity; During the process of the hydraulic oil entering the instrument cavity, operate the instrument to turn the solenoid valve inside the instrument on and off to fill every space inside the instrument with hydraulic oil; After a period of time, when observing that the liquid level of the once-filtered hydraulic oil 22 in the vacuum extraction intermediate container 18 no longer drops, it indicates that the inside of the instrument is completely filled with hydraulic oil.

[0050] 4) Pressurize and fill the system composed of the hydraulic power unit 16, the injection nipple 23, and the formation tester probe 17 to fill the balance cylinder of the instrument with hydraulic oil.

[0051] Connect the motor power supply of the hydraulic oil circulation pump 20. The hydraulic oil circulation pump 20 works to pressurize the hydraulic oil inside the system composed of the hydraulic power unit 16, the injection nipple 23, and the formation tester probe 17, so that the hydraulic oil in the balance cylinder inside the hydraulic power unit 16 rises in pressure, pushing the piston in the balance cylinder to move to the specified scale and filling the hydraulic oil; Disconnect the motor power supply of the hydraulic oil circulation pump 20, and the hydraulic oil circulation pump 20 stops, and the entire vacuum extraction and oil filling process is completed.

Claims

1. A vacuum oil injection device, characterized in that, It includes an oil injection nipple (23), a formation tester probe (17), a vacuum intermediate container (18), a vacuum device (24), and a hydraulic oil container. One end of the oil injection nipple (23) is connected to a hydraulic power unit (16), and the other end is connected to the formation tester probe (17). The vacuum device (24) includes a vacuum drive motor and a vacuum intermediate container (18). The vacuum intermediate container (18) is connected to the oil injection nipple (23), and both the vacuum drive motor and the hydraulic oil container are connected to the vacuum intermediate container (18). A hydraulic oil inlet filter (9) is provided between the vacuum intermediate container (18) and the hydraulic oil container. The oil injection nipple (23) includes a main oil path and a return oil path, and the main oil path is in parallel with the return oil path. One end of the main oil path and one end of the return oil path are both connected to the hydraulic power unit (16), and the other end of the main oil path and the other end of the return oil path are both connected to the formation tester probe (17). A first valve group is provided between the main oil path and the vacuum intermediate container (18), and a second valve group is provided between the return oil path and the vacuum intermediate container (18). Both the first valve group and the second valve group are used to control the hydraulic oil. After the main oil path and the return oil path are in parallel, they are connected to the vacuum intermediate container (18) through a vacuum cut-off valve (3). The first valve group includes a main oil path valve group check valve (14), a main oil path inlet filter (11), and a main oil path cut-off valve (2). The main oil path valve group check valve (14) is in series with the main oil path inlet filter (11), and both the main oil path valve group check valve (14) and the main oil path inlet filter (11) are in parallel with the main oil path cut-off valve (2). The second valve group includes a return oil path valve group check valve (15), a return oil path inlet filter (10), and a return oil path cut-off valve (1). The return oil path valve group check valve (15) is in series with the return oil path inlet filter (10), and both the return oil path valve group check valve (15) and the return oil path inlet filter (10) are in parallel with the return oil path cut-off valve (1).

2. The vacuum oil injection device according to claim 1, characterized in that, The vacuum drive motor includes a hydraulic oil circulation pump (20) and a vacuum pump (19). The hydraulic oil circulation pump (20) is connected between the vacuum intermediate container (18) and the main oil path through a hydraulic oil circulation pump outlet cut-off valve (5). The vacuum pump (19) is connected to the vacuum intermediate container (18) through a vacuum pump inlet cut-off valve (6).

3. The vacuum oil injection device according to claim 2, characterized in that, An oil circulation loop isolation cut-off valve (7) is also provided on the main oil path.

4. The vacuum oil injection device according to claim 1, characterized in that, A vacuum intermediate container inlet cut-off valve (4) is also provided between the hydraulic oil container and the vacuum intermediate container (18).

5. The vacuum oil injection device according to claim 1, characterized in that The capacity of the vacuum intermediate container (18) is greater than the capacity of the inner cavity of the hydraulic power unit (16).

6. The vacuum oil injection device according to claim 1, characterized in that, A vacuum gauge (26) is provided on the vacuum intermediate container (18).

7. A method of using a vacuum oil injection device, which uses the vacuum oil injection device described in any one of claims 1 to 6, characterized in that, It includes the following steps: 1) Turn on the vacuum drive motor, perform vacuum pumping on the vacuum intermediate container (18) so that the hydraulic oil in the hydraulic oil container enters the vacuum intermediate container (18), and then turn off the vacuum drive motor to complete the oil suction process. 2) Turn on the vacuum pump drive to evacuate the hydraulic power unit (16), the oil injection nipple (23), and the formation tester probe (17). 3) Inject hydraulic oil into the hydraulic power unit (16), the oil injection nipple (23), and the formation tester probe (17). 4) Pressurize and fill the system composed of the hydraulic power unit (16), the oil injection nipple (23), and the formation tester probe (17) with oil to fill the balance cylinder of the instrument with hydraulic oil.

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