Hydraulic slip system capable of feeding back various signals and automatically oiling to prevent jamming
By using hydraulic valve signal serialization and an automatic lubrication mechanism, the problems of difficulty in judging the clamping status and insufficient lubrication in hydraulic slip systems during drilling operations have been solved, improving the safety and reliability of the system and enabling it to adapt to high-temperature and high-vibration environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-05
- Publication Date
- 2026-04-03
AI Technical Summary
Existing hydraulic slip systems have difficulty determining the clamping status during drilling or workover operations, posing a risk of misjudgment. Slips may not output a signal during operation, and insufficient lubrication can lead to jamming. Furthermore, their reliability is insufficient in high-temperature and high-vibration environments.
Design a hydraulic slip system with multiple signal feedback and automatic lubrication to prevent jamming. The system achieves reliable feedback on the clamping state of the slip body through the series connection of hydraulic valve signals, establishes a logical interlock between the slip body and the straightening block, and automatically triggers the lubrication of oil, avoiding reliance on electronic control and sensors.
It improves the safety and reliability of the slip system, ensures reliable feedback and lubrication of the slip clamping state, reduces the risk of jamming, and adapts to high temperature and high vibration environments.
Smart Images
Figure CN121781870A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming, belonging to the technical field of oil and gas drilling and well workover equipment. Background Technology
[0002] In existing drilling or workover operations, hydraulic slips are widely used to support and secure the tubing string.
[0003] Traditional hydraulic slip systems typically have the following drawbacks: 1. The hydraulic clamps are installed inside the turntable, making it difficult to determine whether they are fully clamped. If external sensors are used for this purpose, there is a risk of misjudgment. 2. If a regular slip shaft deviates from its normal position, it will be difficult for the slip shaft to function properly. 3. The slip has no signal output during operation, and there is a lack of reliable logic interlock between the closed and open states of the bearing and subsequent actions (such as opening the clamp or lifting the pipe column); 4. Lack of lubrication in the slips causes them to frequently seize. If manual or timed lubrication is used, the reliability of the slips' operation cannot be guaranteed, and it cannot be ensured that the slips are lubricated before clamping. Seizure will lead to significant economic losses in drilling. 5. The reliability of wellhead electrical control or sensors is insufficient in high-temperature, high-vibration, and explosion-proof environments at the well site.
[0004] Therefore, there is a need for a hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming, which does not require pure electric control, can determine the slip load based on the hydraulic state, and automatically add oil under load conditions, so as to improve operational safety and equipment lifespan. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming.
[0006] The technical solution adopted by the present invention to solve the above problems is as follows: a hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming, including a slip unit and a straightening unit. The slip unit is used to open and clamp the tubing, and the straightening unit is used to achieve radial limiting or centering of the tubing. The system also includes a logic valve group unit inside the slip and a control logic unit. The slip unit includes three slip bodies distributed circumferentially. One of the three slip bodies is a middle slip body, and the other two are side slip bodies. The middle slip body is connected to two slip drive cylinders, which are arranged symmetrically. Both side slip bodies are connected to the internal logic valve group unit of the slip body. The internal logic valve unit of the slip includes a hydraulic control circuit. The hydraulic control circuit is equipped with a sequence valve, a balance valve, two first hydraulically controlled check valves, and two stroke valves. The two first hydraulically controlled check valves and the two stroke valves correspond one-to-one with the two side slips. The hydraulic control circuit is connected to the slip unit, the straightening unit, and the control logic unit. The stroke valve is used to detect the position of the side slip, the balance valve is used to prevent the slip from falling, and the sequence valve is used to execute logic actions. The two first hydraulically controlled check valves are used to execute the slip opening signal output and the opening logic action, respectively. The control logic unit includes a control logic circuit connected to the hydraulic control circuit. The control logic circuit is equipped with a slip opening signal collector, a slip clamping signal collector, a low-pressure signal alarm collector, a second hydraulically controlled directional valve, a manual directional valve, a solenoid valve, and a control pressure reducing valve. The second hydraulically controlled directional valve filters slip opening and clamping signals, the manual directional valve releases pressure signals, the solenoid valve controls the opening and clamping of the slip unit, and the control pressure reducing valve stabilizes the system pressure.
[0007] Preferably, the hydraulic control circuit is also equipped with a slip check valve.
[0008] Preferably, the control section logic circuit is further provided with a control check valve.
[0009] Preferably, a high-pressure relief valve is connected to the chuck drive cylinder.
[0010] Preferably, the straightening unit includes a straightening block, and at least one straightening liquid cylinder is connected to the straightening block.
[0011] Preferably, there are two straightening cylinders, which are symmetrically arranged on both sides of the straightening block.
[0012] Preferably, the locking body includes a main body, on which a plurality of sliding grooves are provided on the clamping surface. The sliding grooves are circumferentially distributed and vertically arranged. The inner sidewall of the sliding groove is inclined, and the groove depth gradually decreases from top to bottom. Each sliding groove is slidably connected with a locking strip, which protrudes inward from the sliding groove and fits against the inner sidewall of the sliding groove. The outer sidewall of the locking strip is provided with locking teeth. The top of the main body is recessed to form a groove, and a connecting plate is fixedly installed in the groove. The connecting plate is located above the locking strip. A guide rod is vertically fixed at the top of the locking strip. The guide rod moves through the connecting plate, and a spring is sleeved on the guide rod. The spring is located between the locking strip and the connecting plate, and the two ends of the spring are respectively connected to the connecting plate and the locking strip.
[0013] Preferably, the system also includes an automatic lubricating oil filling unit, which includes a filling circuit. The filling circuit is connected to a slip unit, a straightening unit, and a slip internal logic valve group unit. The filling circuit is equipped with an oil pump, a third hydraulic control directional valve, and two filling directional valves.
[0014] Preferably, the refueling circuit is also equipped with a refueling overflow valve and a refueling pressure reducing valve.
[0015] Preferably, a low oil alarm is connected to the oil pump.
[0016] Compared with the prior art, the advantages of the present invention are as follows: 1. By connecting the signals of each hydraulic valve in series, reliable feedback on the clamping and bearing status of the slip body is achieved; 2. Establishing a logical interlock between the slip body and the straightening block is beneficial for slip clamping; 3. Hydraulic logic interlock via slip body status signal output; 4. The oil pump is automatically triggered for lubrication under actual load conditions of the slip body; 5. Improve system safety and reliability without relying on electronic control and sensors. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming according to the present invention; Figure 2 A schematic diagram showing the connection structure of the slip unit, the straightening unit, and the internal logic valve group unit of the slip unit; Figure 3 This is a schematic diagram of the structure of the control logic unit; Figure 4 A schematic diagram of an automatic lubricating oil filling unit; Figure 5 A three-dimensional diagram of the Kava body; Figure 6This is a cross-sectional view of the kava body; Figure 7 A three-dimensional image with the main body as the subject Figure 8 This is a schematic diagram of the connection structure between the clip and the spring.
[0018] in: Slip unit 1, straightening unit 2, internal logic valve group unit 3, control logic unit 4, automatic lubricating oil filling unit 5; 11 slip body, 12 slip drive cylinder, 23 high pressure relief valve; 111 main body, 112 sliding groove, 113 locking strip, 114 locking tooth, 115 groove, 116 connecting plate, 117 guide rod, 118 spring; 21 straightening block, 22 straightening cylinder; Hydraulic control circuit 31, sequence valve 32, balance valve 33, first hydraulic control check valve 34, stroke valve 35, slip check valve 36; The control section logic circuit 41, the slip open signal collector 42, the slip clamping signal collector 43, the low pressure signal alarm collector 44, the second hydraulic control directional valve 45, the manual directional valve 46, the solenoid valve 47, the control pressure reducing valve 48, the control check valve 49. 51. Refueling circuit, 52. Oil pump, 53. Third hydraulic control directional valve, 54. Refueling directional valve, 55. Low oil alarm, 56. Refueling overflow valve, 57. Refueling pressure reducing valve. Detailed Implementation
[0019] like Figures 1 to 4 As shown, this embodiment of a hydraulic slip system with multiple signal feedback and automatic oiling anti-jamming includes a slip unit 1, a straightening unit 2, a slip internal logic valve group unit 3, and a control logic unit 4. The slip unit 1 is used to open and clamp the tubing, the straightening unit 2 is used to achieve radial limiting or centering of the tubing, the slip internal logic valve group unit 3 is used to execute action logic and signal output, and the control logic unit 4 is used to achieve signal filtering. The slip unit 1 includes three slip bodies 11, which are circumferentially distributed. One of the slip bodies 11 is a middle slip body 11, and the other two are side slip bodies 11. The middle slip body 11 is connected to two slip drive cylinders 12, which are symmetrically arranged. The two side slip bodies 11 are connected to the slip internal logic valve group unit 3. The slip drive cylinder 12 is connected to a high-pressure relief valve 23, which protects the slip drive cylinder 12. During operation, each slip body 11 is circumferentially outside the tube column. The slip drive cylinder 12 enables the slip body 11 to move inward or outward along the conical surface to clamp and open the tube column. The straightening unit 2 includes a straightening block 21, and at least one straightening cylinder 22 is connected to the straightening block 21. The specific number of straightening cylinders 22 is two, and the two straightening cylinders 22 are symmetrically arranged on both sides of the straightening block 21. During operation, before the slip body 11 clamps the tube column, the straightening block 21 is driven by the straightening cylinders 22 to perform radial limiting or centering straightening. Here, the action of the straightening cylinders 22 forms a sequential relationship with the hydraulic power source through the logic valve group unit 3 inside the slip. The internal logic valve unit 3 of the slip includes a hydraulic control circuit 31. The hydraulic control circuit 31 is equipped with a sequence valve 32, a balance valve 33, two first hydraulically controlled check valves 34 and two stroke valves 35. The two first hydraulically controlled check valves 34 and the two stroke valves 35 correspond one-to-one with the two side slip bodies 11. The hydraulic control circuit 31 is connected to the slip unit 1, the straightening unit 2 and the control part logic unit 4 respectively. The stroke valves 35 are used to detect the position of the side slip bodies 11, the balance valves 33 are used to prevent the slip bodies 11 from falling, and the sequence valves 32 are used to execute logical actions. The two first hydraulically controlled check valves 34 are used to execute the slip body 11 opening signal output and opening logical actions respectively. The hydraulic control circuit 31 is also equipped with a slip check valve 36, which is used to prevent oil leakage during the opening signal. The sequential logic between the straightening unit 2 and the locking unit 1 is as follows: 1. During the tubing clamping process, the straightening block 21 first straightens the tubing, and then the slip body 11 clamps it. 2. During the opening process of the tubing string, the slip body 11 is opened first, and then the straightening block 21 is released; The position and signal logic of the 11-body valve are as follows: 1. When the slip drive cylinder 12 drives the slip body 11 to clamp, the slip drive cylinder 12 has a pressure output. When clamping, it will determine that the slip bodies 11 in both slip units 1 are in the clamping position, and a clamping signal will be output. 2. Similarly, when the slip drive cylinder 12 is opened, there will also be pressure output. When the slip body 11 is fully opened, the signal terminal of the slip drive cylinder 12 will generate an opening signal output. The control logic unit 4 includes a control logic circuit 41 connected to the hydraulic control circuit 31. The control logic circuit 41 is equipped with a slip opening signal collector 42, a slip clamping signal collector 43, a low pressure signal alarm collector 44, a second hydraulic control directional valve 45, a manual directional valve 46, a solenoid valve 47, a control pressure reducing valve 48, and a control check valve 49. The second hydraulic control directional valve 45 is used to filter the slip body 11 opening and clamping signals. The manual directional valve 46 is used to release the signal pressure. The solenoid valve 47 is used to control the opening and clamping of the slip body 11. The control pressure reducing valve 48 is used to stabilize the system pressure. The control check valve 49 is used to protect the hydraulic system and prevent the pump station from reversing or being inserted incorrectly. The specific principle of logic unit 4 in the control section is as follows: A pressure signal will be output when the slip body 11 is open, and a pressure signal will also be output when the slip body 11 is clamped. The method to determine whether the signal is from the open or clamped slip body 11 is: the pressure of the oil circuit of the open slip body 11 is controlled by the second hydraulic control directional valve 45, and the oil circuit of the clamping is pressurized. By controlling the direction of the oil circuit, the signal from the same pressure source can be identified as different pressure sources, thus achieving screening. Additionally, it should be noted that if the hydraulic oil in the system does not reach the working pressure, a low pressure signal will be fed back to remind the operator to pressurize the system. Logically, the slips should not be opened under low pressure. It also includes an automatic lubricating oil filling unit 5, which includes a filling circuit 51. The filling circuit 51 is connected to the slip unit 1, the straightening unit 2 and the slip internal logic valve group unit 3. The filling circuit 51 is equipped with an oil pump 52, a third hydraulic control directional valve 53 and two filling directional valves 54. The oil pump 52 is connected to a low oil alarm 55. The filling circuit 51 is also equipped with a filling overflow valve 56 and a filling pressure reducing valve 57. Among them, the two refueling directional valves 54 are used to control the third hydraulic directional valve 53 and the oil pump 52, respectively; When the clamping pressure or opening pressure of the tubing string is established, the oil pump 52 supplies grease to the slip friction pair and the centering friction pair to achieve the effect of preventing the slip body 11 from jamming and automatically lubricating the centering block 21. The object to be lubricated by the oil pump 52 may include: 1. The locking pin portion connecting the locking body 11; 2. The sliding pair of the kava body 11 moving along the inclined plane; 3. The guiding and supporting parts of the straightening block 21; When the slip body 11 is clamped, a signal is output, and the oil pump 52 receives the signal to perform the lubrication action, adding lubricating grease. When the slip is opened, a signal is output, and the oil pump 52 can be set to stop working. The system can also be set to add lubricating oil after a certain number of opening and closing cycles, or within a set time period. The electronic control logic settings can be determined based on the site conditions. In summary, reliable feedback on the clamping and bearing state of the slip body 11 is achieved by connecting the signals of each hydraulic valve in series. Establishing a logical interlock between the slip body 11 and the straightening block 21 is beneficial for slip clamping; Hydraulic logic interlock via the status signal output of the slip body 11; Under actual load conditions, the oil pump 52 is automatically triggered to perform lubrication on the slip body 11. Improve system safety and reliability without relying on electronic controls and sensors; like Figures 5 to 8 As shown, the locking body 11 includes a main body 111. Multiple sliding grooves 112 are provided on the clamping surface of the main body 111. The multiple sliding grooves 112 are circumferentially distributed and vertically arranged. The inner sidewall of each sliding groove 112 is inclined, and the groove depth gradually decreases from top to bottom. Each sliding groove 112 is slidably connected to a locking strip 113. The locking strip 113 protrudes inward from the sliding groove 112 and fits against the inner sidewall of the sliding groove 112. The outer sidewall of the locking strip 113 is provided with locking teeth. 114. The top of the main body 111 is recessed to form a groove 115. A connecting plate 116 is fixedly installed in the groove 115. The connecting plate 116 is located above the locking strip 113. A guide rod 117 is vertically fixed at the top of the locking strip 113. The guide rod 117 moves through the connecting plate 116. A spring 118 is sleeved on the guide rod 117. The spring 118 is located between the locking strip 113 and the connecting plate 116. The two ends of the spring 118 are respectively connected to the connecting plate 116 and the locking strip 113. When the tubular column is clamped, the three slip bodies 11 are distributed circumferentially on the outside of the tubular column. Then, the three slip bodies 111 move simultaneously toward the tubular column, and the side of the clamping strip 113 with the clamping teeth 114 contacts the tubular column. At this time, the three slip bodies 111 surround the tubular column and form a cone shape that is larger at the top and smaller at the bottom, thus achieving the clamping of the tubular column. During the upward movement of the clamped tubular column, the clamping strip 113 and the main body 111 move relative to each other in the vertical direction. That is, the clamping strip 113 moves downward in the sliding groove 112, and the inclined surface of the sliding groove 112 pushes the clamping strip 113 toward the tubular column, thereby further clamping the tubular column and improving the clamping effect of the tubular column. In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims
1. A hydraulic slip system with multiple signal feedback and automatic oiling anti-jamming, comprising a slip unit (1) and a straightening unit (2), wherein the slip unit (1) is used to open and clamp the tubing, and the straightening unit (2) is used to achieve radial limiting or centering of the tubing, characterized in that: It also includes the Kavaney logic valve group unit (3) and the control logic unit (4); The slip unit (1) includes three slip bodies (11), which are distributed circumferentially. Among the three slip bodies (11), one is a middle slip body (11), and the other two are side slip bodies (11). The middle slip body 11 is connected to two slip drive cylinders (12), which are arranged symmetrically. The two side slip bodies (11) are connected to the internal logic valve group unit (3). The internal logic valve unit (3) of the slip includes a hydraulic control circuit (31). The hydraulic control circuit (31) is equipped with a sequence valve (32), a balance valve (33), two first hydraulic control check valves (34) and two stroke valves (35). The two first hydraulic control check valves (34) and the two stroke valves (35) correspond one-to-one with the two side slip bodies (11). The hydraulic control circuit (31) is connected to the slip unit (1), the straightening unit (2) and the control part logic unit (4) respectively. The stroke valve (35) is used to detect the position of the side slip body (11). The balance valve (33) is used to prevent the slip body (11) from falling. The sequence valve (32) is used to execute the logic action. The two first hydraulic control check valves (34) are used to execute the slip body (11) opening signal output and opening logic action respectively. The control logic unit (4) includes a control logic circuit (41) connected to the hydraulic control circuit (31). The control logic circuit (41) is equipped with a slip opening signal collector (42), a slip clamping signal collector (43), a low pressure signal alarm collector (44), a second hydraulic control directional valve (45), a manual directional valve (46), a solenoid valve (47), and a control pressure reducing valve (48). The second hydraulic control directional valve (45) is used to screen the slip body (11) opening and clamping signals, the manual directional valve (46) is used to release the signal pressure, the solenoid valve (47) is used to control the opening and clamping of the slip unit (1), and the control pressure reducing valve (48) is used to stabilize the system pressure.
2. The hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming as described in claim 1, characterized in that: The hydraulic control circuit (31) is also equipped with a slip check valve (36).
3. The hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming as described in claim 1, characterized in that: The control section logic circuit (41) is also equipped with a control check valve (49).
4. The hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming as described in claim 1, characterized in that: A high-pressure relief valve (23) is connected to the chuck drive cylinder (12).
5. A hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming as described in claim 1, characterized in that: The straightening unit (2) includes a straightening block (21), and at least one straightening liquid cylinder (22) is connected to the straightening block (21).
6. A hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming, as described in claim 5, is characterized in that: The number of the straightening liquid cylinders (22) is two, and the two straightening liquid cylinders (22) are symmetrically arranged on both sides of the straightening block (21).
7. A hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming as described in claim 1, characterized in that: The locking body (11) includes a main body (111). Multiple sliding grooves (112) are provided on the clamping surface of the main body (111). The multiple sliding grooves (112) are circumferentially distributed and vertically arranged. The inner wall of each sliding groove (112) is inclined. The depth of each sliding groove (112) gradually decreases from top to bottom. Each sliding groove (112) is slidably connected to a locking strip (113). The locking strip (113) protrudes inward from the sliding groove (112) and fits against the inner wall of the sliding groove (112). The outer wall of the locking strip (113) is provided with locking teeth (114). The top of the main body (111) is recessed to form a groove (115). A connecting plate (116) is fixedly installed in the groove (115). The connecting plate (116) is located above the clip (113). A guide rod (117) is vertically fixed at the top of the clip (113). The guide rod (117) moves through the connecting plate (116). A spring (118) is sleeved on the guide rod (117). The spring (118) is located between the clip (113) and the connecting plate (116). The two ends of the spring (118) are connected to the connecting plate (116) and the clip (113) respectively.
8. A hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming, as described in any one of claims 1 to 7, characterized in that: It also includes an automatic lubricating oil filling unit (5), which includes a filling circuit (51). The filling circuit (51) is connected to the slip unit (1), the straightening unit (2) and the slip internal logic valve group unit (3). The filling circuit (51) is equipped with an oil pump (52), a third hydraulic control directional valve (53) and two filling directional valves (54).
9. A hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming, as described in claim 8, characterized in that: The refueling circuit (51) is also equipped with a refueling overflow valve (56) and a refueling pressure reducing valve (57).
10. A hydraulic slip system with multiple signal feedback and automatic oiling to prevent jamming, as described in claim 8, characterized in that: A low oil alarm (55) is connected to the oil pump (52).