Cable logging tractor hydraulic pusher pup joint

Abstract

The application discloses a hydraulic pushing and supporting short section of a cable logging tractor, and solves the problems of single function, large space occupation and poor safety reliability of the existing pushing and supporting short section. The technical scheme comprises a shell provided with upper and lower joints at two ends, a low-pressure bin arranged on the upper section of the shell, a high-pressure bin arranged on the lower section of the shell, and a control bin with a middle section, wherein the control bin is provided with a hydraulic pump and a hydraulic control assembly, the inlet of the hydraulic pump is communicated with the low-pressure bin through the control bin, and the outlet of the hydraulic pump is connected with the hydraulic control assembly; the hydraulic control assembly comprises a first hydraulic oil pipeline and a second hydraulic oil pipeline, the first hydraulic oil pipeline is provided with a pressure sensor, the high-pressure oil inlet of the first hydraulic oil pipeline is connected with the hydraulic pump, and the high-pressure oil outlet of the first hydraulic oil pipeline is connected with the high-pressure bin; the second hydraulic oil pipeline is provided with an electromagnetic valve, the pressure relief oil inlet of the second hydraulic oil pipeline is connected with the high-pressure bin, and the pressure relief oil outlet of the second hydraulic oil pipeline is communicated with the control bin. The application has the advantages of compact and reasonable structure, small space, multiple functions of control, protection and purification, and good safety reliability.

Description

Technical Field

[0001] This invention relates to a hydraulic traction device for downhole logging in the petroleum field, specifically a hydraulic push-and-pull section for a cable logging traction device. Background Technology

[0002] Currently, there are two types of traction devices used in cable logging in the oil industry: mechanical traction devices and hydraulic traction devices.

[0003] The hydraulic traction device uses hydraulic oil as the medium. A hydraulic pump pressurizes the hydraulic oil to push the traction arm open. Simultaneously, when the traction arm opens, it exerts a certain positive pressure on the inner wall of the casing, thus enabling the traction device to generate traction force and move within the casing. The push-pull section of the traction device's push-pull sub-section provides power for the opening and closing of the traction arm using hydraulic oil as the medium. Existing traction device push-pull sub-sections have the following problems:

[0004] (1) During the downhole movement, the traction arm of the traction device may get stuck by debris in the well, and the traction arm may not be able to retract normally. Under the pressure of the high-pressure chamber, the traction arm always maintains a positive pressure on the casing, which can easily lead to the traction arm getting stuck. (2) When the hydraulic pump is working, the pressure in the high-pressure chamber will gradually rise. Once the pressure exceeds the maximum sealing pressure value of the sealing ring in the high-pressure chamber, the wellbore fluid will flow into the high-pressure chamber, causing the traction device to malfunction. (3) The back-and-forth movement of the traction arm can easily generate large debris such as iron powder and oil blocks. These debris will enter the high-pressure hydraulic oil. If this part of the hydraulic oil is directly reused, it can easily cause blockage or wear of valves and other components, affecting the normal use of the device, causing wear of the traction wheel, and in severe cases, the traction arm may get stuck. (4) Due to the casing size limitation, the outer diameter of the traction device is also strictly limited. If it is desired that the existing traction device push-back section has multiple functions such as precise control, protection, hydraulic oil purification and monitoring, and the above functions are achieved by using a split device, a sufficiently large oil tank space is required. This will result in the push-back section being too long, which will directly affect the traction device's delivery. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems and provide a hydraulic push-and-pull section for a cable logging traction device that is simple in structure, small in size, compact and reasonable in layout, and has multiple functions such as control, protection and purification, and has good safety and reliability.

[0006] This invention relates to a hydraulic push-and-pull section for a cable logging traction device, comprising a housing with upper and lower connectors at both ends. The upper section of the housing has a low-pressure chamber, the lower section has a high-pressure chamber, and a control chamber in the middle section. The control chamber is equipped with a hydraulic pump and a hydraulic control assembly. The inlet of the hydraulic pump is connected to the low-pressure chamber via the control chamber, and the outlet is connected to the hydraulic control assembly. The hydraulic control assembly includes a first hydraulic oil pipe and a second hydraulic oil pipe. The first hydraulic oil pipe is equipped with a pressure sensor, whose high-pressure oil inlet is connected to the hydraulic pump, and whose high-pressure oil outlet is connected to the high-pressure chamber. The second hydraulic oil pipe is equipped with a solenoid valve, whose pressure relief oil inlet is connected to the high-pressure chamber, and whose pressure relief oil outlet is connected to the control chamber.

[0007] A filter is installed on the second hydraulic oil pipeline near the pressure relief oil inlet.

[0008] The first hydraulic oil pipeline is also equipped with an emergency pressure relief pipeline connected to the control compartment, and the emergency pressure relief pipeline is equipped with a check valve.

[0009] The filter has two layers: an upper layer is a high-pressure chamber, and a lower layer is a filter chamber equipped with a filter screen. The first hydraulic oil pipeline is connected to the high-pressure oil outlet through the high-pressure chamber, and the second hydraulic oil pipeline is connected to the pressure relief oil inlet through the filter chamber.

[0010] The high-pressure oil inlet and high-pressure oil outlet of the first hydraulic oil pipeline and the pressure relief oil inlet of the second hydraulic oil pipeline are arranged on the vertical center line of the control compartment axis.

[0011] The low-pressure chamber is equipped with a central connecting rod. The upper end of the central connecting rod is connected to the upper connector, and the lower end passes through the low-pressure chamber and is fixed on the hydraulic pump support of the hydraulic pump. The upper section of the central connecting rod has an oil hole, and the lower section is fitted with a spring piston. The internal part has a hollow oil passage, and the lower end has an oil passage hole. The low-pressure chamber is connected to the control chamber through the oil hole, the oil passage, and the oil passage hole.

[0012] The chamber body corresponding to the spring piston of the low-pressure chamber is connected to the wellbore.

[0013] The housing consists of an upper housing corresponding to the low-pressure chamber and a lower housing corresponding to the control chamber and the high-pressure chamber. The upper housing and the lower housing are fitted together with shear pin assemblies and limit pin assemblies along the circumferential direction. The hydraulic assembly is connected to the high-pressure chamber and the lower housing via the fixed housing.

[0014] The insertion depth at the connection between the hydraulic pump outlet and the hydraulic component is less than the limiting distance of the limiting component.

[0015] The shear pin assembly includes shear pin holes located at the joint between the upper and lower housings, shear pins inserted into the corresponding shear pin holes, and a shear pin cap fitted onto the upper end of the shear pin and threadedly connected to the lower housing.

[0016] The limiting pin assembly includes a pin hole and a limiting pin hole located at the joint between the upper and lower housings, and a limiting pin inserted into the pin hole and the limiting pin hole respectively.

[0017] A limiting pin assembly is provided at the joint between the hydraulic pump support and the high-pressure chamber housing. The limiting pin assembly includes a pin hole and a limiting pin hole corresponding to the joint between the hydraulic pump support and the high-pressure chamber housing, and a limiting pin inserted into the pin hole and the limiting pin hole respectively. The distance between the limiting holes is the same as the limiting distance of the limiting hole in the lower housing.

[0018] In response to the problems existing in the background technology, the inventors made the following improvements: (1) A low-pressure chamber, a control chamber and a high-pressure chamber are set up separately. The hydraulic control components and the hydraulic pump are set up in the control chamber as a whole. The low-pressure chamber is connected to the control chamber. The hydraulic oil can flow freely between the low-pressure chamber and the control chamber. When the hydraulic pump pumps the hydraulic oil in the control chamber to the high-pressure chamber, the hydraulic oil in the control chamber decreases and the pressure in the control chamber decreases. Then the hydraulic oil in the low-pressure chamber will flow into the control chamber to maintain the pressure balance between the low-pressure chamber and the control chamber and ensure the continuous operation of the hydraulic pump. When the high-pressure chamber is depressurized, the hydraulic oil in the high-pressure chamber flows into the control chamber. At the same time, the pressure in the control chamber increases, which in turn increases the pressure in the low-pressure chamber, pushing the piston. The low-pressure chamber recovers the hydraulic oil without releasing it, in preparation for the hydraulic oil to be used for the next push. (2) A spring piston is installed on the central connecting rod of the low-pressure chamber. On the one hand, when the hydraulic oil in the control chamber decreases and the pressure drops, the spring can push the piston to quickly transport the hydraulic oil in the low-pressure chamber to the control chamber. On the other hand, since the chamber body corresponding to the spring piston of the low-pressure chamber is connected to the wellbore, during operation, as the depth of the traction device in the well increases, the pressure increases, which can push the piston to move, so that the hydraulic oil pressure in the low-pressure chamber is balanced with the external pressure of the traction device. (3) A first hydraulic oil pipeline and a second hydraulic oil pipeline are arranged in the hydraulic control assembly. The pressurized hydraulic oil drawn from the hydraulic pump is sent to the high-pressure chamber through the first hydraulic oil pipeline. At the same time, a pressure sensor is installed on the first hydraulic oil pipeline to directly measure the pressure of the first pipeline. The pressure (also the pressure of the high-pressure oil chamber) can be measured and transmitted to the ground through the traction device circuit. Engineers can directly control the hydraulic pump to adjust the pressure of the high-pressure chamber according to the pressure data to meet the pressure required for the operation of the traction device; (4) An emergency pressure relief pipe connected to the control chamber is also provided in the first hydraulic oil pipeline. A check valve is provided on the emergency pressure relief pipe. When the pressure of the high-pressure chamber is greater than the check valve value, the check valve will automatically open to relieve the pressure of the high-pressure chamber. When the pressure of the high-pressure chamber is lower than the check valve value, the check valve will automatically close, thereby limiting the range and limit of the pressure of the high-pressure chamber, so as to avoid the pressure in the high-pressure chamber from exceeding the maximum sealing pressure value of the sealing ring, causing the wellbore liquid to flow into the high-pressure chamber and causing the traction device to malfunction. (5) The hydraulic oil in the high-pressure chamber is unloaded into the control chamber through the second hydraulic oil pipeline, and a solenoid valve is installed in the second hydraulic oil pipeline. Before the hydraulic pump works, the solenoid valve is powered first and the valve is closed to isolate the high-pressure chamber from the control chamber. When the traction arm gets stuck and needs to be retracted in time, the power supply to the solenoid valve can be disconnected. The high-pressure chamber is then instantly connected to the control chamber through the second hydraulic oil pipeline. This causes the pressure in the high-pressure chamber to drop rapidly, and the traction arm retracts automatically, effectively protecting the traction device.6) A filter is also installed on the second hydraulic oil pipeline to filter the hydraulic oil before it enters the filter, removing larger impurities such as iron powder and oil lumps to prevent blockage of the solenoid valve passage. Furthermore, the filter consists of two sealed, isolated layers: an upper high-pressure chamber and a lower filter compartment, which are detachably connected for easy replacement of the filter screen in the filter compartment. The first hydraulic oil pipeline connects to the high-pressure oil inlet via the high-pressure chamber, and the second hydraulic oil pipeline connects to the pressure relief oil outlet via the filter. On the one hand, the high-pressure chamber helps improve the pressure resistance of the high-pressure chamber shell; on the other hand, vibration or jamming may occur when the traction device moves forward. This invention uses a filter with a double-layer structure to vertically arrange and fix the outlets of the first and second hydraulic oil pipelines together, significantly improving the pipeline's support strength and reducing the impact of vibration. Furthermore, the stacked arrangement makes the structure more compact, improving space utilization and reducing the length of the push section. Even with multiple components such as pressure sensors, solenoid valves, and filters, the two inlets and outlets connecting to the high-pressure chamber are centrally located, ensuring stable and balanced pressure during use and improving equipment usability. (7) When the solenoid valve is damaged and cannot depressurize the high-pressure chamber, a mechanical depressurization structure is also designed. Since the upper connector connects the upper housing and the central connecting rod at the same time, when the upper connector is lifted, on the one hand, the central connecting rod can drive the hydraulic pump to move upward through the hydraulic pump support, so that the outlet of the hydraulic pump is separated from the hydraulic control component fixed on the lower housing. The hydraulic oil in the high-pressure chamber is reversed and quickly discharged into the control chamber through the hydraulic control component. After the high-pressure chamber is quickly depressurized, the traction arm is retracted to eliminate the jamming. On the other hand, since the upper housing and the lower housing are fitted with shear pin assembly and limit pin assembly, as the name suggests, when the shear pin assembly is subjected to an upward force exceeding the preset pressure, it will break, causing the upper and lower housing to move relative to each other at the fitting point. However, it is simultaneously limited by the limit pin assembly. The separation action of the upper and lower housing can only occur within the limit distance set by the limit pin, and will not cause the upper and lower housing to completely separate. This achieves the purpose of mechanical depressurization and ensures the overall connection of the push-back section.

[0019] This invention has a simple structure, small size, compact and reasonable layout, and combines multiple functions such as control, protection and purification. It also has the function of mechanical pressure relief in emergency situations, good safety and reliability, and long service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a partial installation diagram of the shear pin assembly A and the limit pin assembly B.

[0022] Figure 3 This is a schematic diagram of the central connecting rod.

[0023] Figure 4 This is a schematic diagram of the hydraulic control assembly.

[0024] Figure 5 This is a schematic diagram of the installation of the hydraulic control component of the present invention.

[0025] Figure 6 This is a partial structural diagram of the filter chamber 12.2 in filter 12.

[0026] Among them, 1 is the hydraulic control component, 2 is the hydraulic pump, 2.2 is the hydraulic pump support, 3 is the high-pressure chamber, 4 is the low-pressure chamber, 4.1 is the center connecting rod, 4.2 is the oil hole, 4.3 is the oil passage, 4.4 is the oil passage hole, 4.5 is the spring piston, 5 is the lower connector, 6 is the upper connector, 7 is the control chamber, 7.1 is the fixed housing, 8 is the upper housing, and 9 is the lower housing;

[0027] 11 Pressure sensor, 12 Filter, 12.1 High pressure chamber, 12.2 Filter compartment, 12.3 Sealing ring, 12.4 Plug, 13 Solenoid valve, 14 Check valve, 15 Emergency pressure relief pipeline, 16 First hydraulic oil pipeline, 16.1 High pressure oil inlet, 16.2 High pressure oil outlet, 17 Second hydraulic oil pipeline, 17.1 Pressure relief oil inlet, 17.2 Pressure relief oil outlet.

[0028] A shear pin assembly, A1 shear pin hole, A2 shear pin, A3 shear pin cap;

[0029] B limit pin assembly, B1 pin hole, B2 limit pin hole, B3 limit pin. Detailed Implementation

[0030] The present invention will be further explained below with reference to the accompanying drawings:

[0031] See Figure 1 The present invention includes a housing with upper and lower connectors 6 and 5 at both ends. The upper section of the housing is provided with a low-pressure chamber 4, the middle section with a control chamber 7, and the lower section with a high-pressure chamber 3.

[0032] See Figure 2 The housing consists of an upper housing 8 corresponding to the low-pressure chamber 4 and a lower housing 9 corresponding to the control chamber 7 and the high-pressure chamber 3. The upper housing 8 and the lower housing 9 are provided with shear pin assembly A and limit pin assembly B along the circumferential direction at the joint. In this embodiment, four sets of shear pin assembly A and two sets of limit pin assembly B are evenly provided along the circumferential direction of the housing.

[0033] See Figure 2 The shear pin assembly A includes shear pin holes A1 located at the joint between the upper housing 8 and the lower housing 9, shear pins A2 inserted into the two corresponding shear pin holes A1, and shear pin caps A3 fitted onto the upper end of the shear pins and threadedly connected to the lower housing 9.

[0034] The limiting pin assembly B includes a pin hole B1 (located in the upper housing 8) and a limiting pin hole B2 (located in the lower housing 9) at the corresponding connection between the upper housing 8 and the lower housing 9, and a limiting pin B3 corresponding to the pin hole B1 and the limiting pin hole B2.

[0035] See Figure 1 and Figure 3 The low-pressure chamber 4 is equipped with a central connecting rod 4.1. The upper end of the central connecting rod 4.1 is connected to the upper connector 6, and the lower end passes through the low-pressure chamber 4 and connects to the hydraulic pump support 2.2 of the hydraulic pump 2 in the control chamber 7. The upper section of the central connecting rod 4.1 has an oil hole 4.2, and the lower section is fitted with a spring piston 4.5. The spring piston 4.5 separates the chamber body corresponding to the upper section of the central connecting rod 4.1 (the part of the chamber body above the spring piston) and the chamber body corresponding to the lower section of the spring piston 4.5 (the part of the chamber body below the spring piston) of the low-pressure chamber 4, and the two are not interconnected. ； The central connecting rod 4.1 has a hollow oil passage 4.3 inside and an oil passage hole 4.4 at its lower end. The upper section of the low-pressure chamber 4 is connected to the control chamber through the oil hole 4.2, the oil passage 4.3, and the oil passage hole 4.4, so that hydraulic oil can flow between the low-pressure chamber 4 and the control chamber 7. The spring piston 4.5 includes a piston and a spring that are fitted onto the lower section of the central connecting rod 4.1. The front end of the spring abuts against the piston, and the rear end abuts against the upper housing 8. A sealing ring can be set on the piston surface to ensure that the hydraulic oil in the chamber corresponding to the upper section of the central connecting rod 4.1 in the low-pressure chamber 3 will not leak into the chamber corresponding to the spring piston 4.5. Preferably, the chamber corresponding to the spring piston 4.5 in the lower section of the low-pressure chamber 4 is connected to the wellbore. As the depth of the traction device in the well increases, the pressure increases, which can push the piston to move, so that the hydraulic oil pressure in the low-pressure chamber 4 is balanced with the pressure outside the traction device.

[0036] See Figure 1 and Figure 4 The control chamber 7 is equipped with a hydraulic pump 2 (the hydraulic pump body is mounted on the hydraulic pump support 2.2, and the rear section of the hydraulic pump body is not shown in the diagram to show the oil passage hole 4.4) and a hydraulic control assembly 1. The inlet of the hydraulic pump 2 is connected to the control chamber 7, and the outlet is connected to the hydraulic control assembly. The hydraulic control assembly 1 includes a first hydraulic oil pipe 16 and a second hydraulic oil pipe 17, both with a diameter of 2-3 mm.

[0037] The first hydraulic oil pipeline 16 is equipped with a pressure sensor 11, and its high-pressure oil inlet 16.1 is connected to the outlet of the hydraulic pump 2 (the insertion depth at the connection is less than the limiting distance of the limiting pin assembly B), and the high-pressure oil outlet 16.2 is connected to the high-pressure chamber 3; the first hydraulic oil pipeline 16 is connected to the control chamber 7 via an emergency pressure relief pipeline 15, and the emergency pressure relief pipeline 15 is equipped with a one-way valve 14.

[0038] The pressure relief oil inlet 17.1 of the second hydraulic oil pipeline 17 is connected to the high pressure chamber 3, and the pressure relief oil outlet 17.2 is connected to the control chamber 7. The second hydraulic oil pipeline is equipped with a solenoid valve 13 and a filter 12, and the filter 12 is located on the pipeline near the pressure relief oil inlet 17.1.

[0039] See Figure 6 The filter is installed inside the control device and has an upper and lower two-layer structure. The upper layer is a high-pressure chamber 12.1, and the lower layer is a filter chamber 12.2 with a filter screen larger than 35 mesh. The upper and lower layers are detachably sealed and isolated by a sealing ring 12.3 and a plug 12.4 for easy replacement of the filter screen. The first hydraulic oil pipe 16 is connected to the high-pressure oil outlet 16.2 through the high-pressure chamber 12.1, and the second hydraulic oil pipe 17 is connected to the pressure relief oil inlet 17.1 through the filter chamber 12.2.

[0040] See Figure 4 The filter chamber 12.2 is arranged on the vertical center line of the control chamber 7. The high-pressure oil inlet 16.1 and high-pressure oil outlet 16.2 of the first hydraulic oil pipeline 16 and the pressure relief oil inlet 17.1 of the second hydraulic oil pipeline 17 are also arranged on the vertical center line of the control chamber 7.

[0041] The hydraulic control component 1 is mounted on the fixed housing 7.1, which is fixed to the lower housing 9 and connected to the high-pressure chamber 3 at its lower end. Preferably, the upper end of the fixed housing 7.1 can also be sleeved with the lower end of the hydraulic pump support 7.1. A limiting pin assembly can also be provided at the sleeve. When the lifting force is applied to the hydraulic pump support 7.1, the hydraulic pump support 7.1 and the fixed housing 7.1 will also move relative to each other under the action of the limiting pin assembly, so as to prevent the hydraulic pump support 7.1 and the fixed housing 7.1 from completely separating and further ensure the integrity of the device.

[0042] Working principle:

[0043] The traction device generates high pressure by hydraulically pushing against the short section, which opens the traction arm of the traction section. The upper connector 6 of the hydraulically pushing against the short section is connected to the traction device circuit control section, and the lower connector 5 is connected to the traction section.

[0044] 1. In the hydraulic control assembly 1: the hydraulic pump 2 pressurizes the hydraulic oil in the control chamber 7 and sends it into the hydraulic control assembly 1. After passing through the first hydraulic oil pipeline 16 and the high-pressure chamber 12.1, it enters the high-pressure chamber 3 through the high-pressure oil outlet 16.2 to provide pressure for the traction section.

[0045] When the pressure sensor 11 measures the pressure in the first hydraulic oil pipeline 16 (which is also the pressure in the high-pressure chamber 3) in real time, the measured data can be transmitted to the ground through the traction device circuit. The engineer can directly control the hydraulic pump 2 to adjust the pressure in the high-pressure chamber 3 according to the pressure data to meet the appropriate pressure required for the traction device to work.

[0046] When the pressure in the high-pressure chamber exceeds the threshold of check valve 14, check valve 14 automatically opens, and the hydraulic oil in the high-pressure chamber 3 flows rapidly into the control chamber 7 through the emergency pressure relief pipe 15 to relieve pressure in the high-pressure chamber 3. When the pressure in the high-pressure chamber 3 after pressure relief is lower than the threshold pressure of check valve 14, check valve 14 automatically closes, thereby limiting the range and limit of the pressure in the high-pressure chamber 3 to prevent the pressure in the high-pressure chamber 3 from exceeding the maximum sealing pressure value of the sealing ring, which could cause wellbore fluid to flow into the high-pressure chamber 3 and cause a tractor malfunction.

[0047] The opening and closing of the second hydraulic oil pipeline 17 is controlled by solenoid valve 13. Before the hydraulic pump 2 starts working, the solenoid valve 13 is powered on and closed, isolating the high-pressure chamber 3 from the control chamber 7. When the traction arm gets stuck and needs to be retracted in time, the power supply to the solenoid valve 13 can be disconnected. The high-pressure chamber 3 is then instantly connected to the control chamber 7 through the second hydraulic oil pipeline 17. Hydraulic oil flows into the control chamber 7 through the pressure relief inlet 17.1, the filter chamber 12.2, the solenoid valve 13, and the pressure relief outlet 17.2 of the second hydraulic oil pipeline 17. This causes the pressure in the high-pressure chamber 3 to drop rapidly, and the traction arm retracts automatically, effectively protecting the traction device.

[0048] 2. When hydraulic pump 2 pumps the hydraulic oil from control chamber 7 to high-pressure chamber 3, the hydraulic oil in control chamber 7 decreases and the pressure drops. Then, the hydraulic oil pre-stored in low-pressure chamber 4, under the action of spring piston 4.5, flows into control chamber 7 through oil holes 4.2 distributed on the central connecting rod 4.1, through oil passages 4.3 and 4.4, achieving pressure balance between the two chambers and ensuring continuous operation of hydraulic pump 2. The chamber body corresponding to spring piston 4.5 in the lower section of low-pressure chamber 7 is connected to the wellbore. As the depth of the traction device in the well increases, the pressure increases, which can overcome the spring force to push spring piston 4.5 to move, keeping the hydraulic oil pressure in low-pressure chamber 4 balanced with the pressure outside the traction device.

[0049] 3. When the traction arm of the traction device gets stuck downhole, as mentioned above, the high-pressure chamber 3 can be depressurized through the solenoid valve 13. However, if the solenoid valve 13 is damaged and cannot depressurize the high-pressure chamber 3 in time, the traction arm cannot be retracted, which can easily cause an engineering accident. At this time, the upper connector 6 can also be lifted. On the one hand, the lifting force of the upper connector 6 pulls the central connecting rod 4.2, which drives the hydraulic pump support 2.2 to move the hydraulic pump 2 upward, so that the outlet of the hydraulic pump 2 is disengaged from the high-pressure oil inlet 16.1 of the hydraulic control component 1 (because the insertion depth of the connection between the high-pressure oil inlet 16.1 and the outlet of the hydraulic pump 2 is less than the limiting distance of the limiting pin component B, the lifting force can ensure that the two are disengaged). The high-pressure chamber 3 is connected to the control chamber 7, and the hydraulic oil in the high-pressure chamber 3 is quickly discharged into the control chamber 7 through the hydraulic control component 1. After the high-pressure chamber 3 is quickly depressurized, the traction arm is retracted, eliminating the jamming. On the other hand, the upper connector 6 can also be lifted. The lifting force is applied to the shear pin assembly A via the upper housing 8. When the lifting force exceeds the set bearing capacity of the shear pin assembly A, the shear pins A2 break completely, and the upper housing 8 moves upward relative to the lower housing 9. At the same time, the hydraulic pump support 2.2 moves upward relative to the fixed chamber housing 7.1. The limiting pin assembly B then comes into play, and the limiting pin B3 is stopped from moving from one end to the other end in the limiting pin hole B2 (i.e., the displacement hole). The separation action of the upper and lower housings can only occur within the limiting distance set by the limiting pin assembly B, and the upper and lower housings 8 and 9 will not be completely separated. This achieves the purpose of mechanical pressure relief while ensuring the overall connection of the push-back section.

Claims

1. A hydraulic push-type short section for a cable logging traction device, comprising a housing with upper and lower connectors at both ends, wherein the upper section of the housing has a low-pressure chamber and the lower section has a high-pressure chamber, characterized in that, It also includes a control compartment in the middle section, which is equipped with a hydraulic pump and a hydraulic control assembly. The inlet of the hydraulic pump is connected to the low-pressure compartment via the control compartment, and the outlet is connected to the hydraulic control assembly. The hydraulic control assembly includes a first hydraulic oil pipeline and a second hydraulic oil pipeline. The first hydraulic oil pipeline is equipped with a pressure sensor, whose high-pressure oil inlet is connected to the hydraulic pump, and its high-pressure oil outlet is connected to the high-pressure compartment. The second hydraulic oil pipeline is equipped with a solenoid valve, whose pressure relief oil inlet is connected to the high-pressure compartment, and its pressure relief oil outlet is connected to the control compartment. The second hydraulic oil pipeline is equipped with a filter on the pipeline near the pressure relief oil inlet. The filter has two layers: the upper layer is a high-pressure chamber and the lower layer is a filter chamber with a filter screen. The first hydraulic oil pipeline is connected to the high-pressure oil outlet through the high-pressure chamber, and the second hydraulic oil pipeline is connected to the pressure relief oil inlet through the filter chamber. The first hydraulic oil pipeline is also equipped with an emergency pressure relief pipeline connected to the control compartment, and the emergency pressure relief pipeline is equipped with a check valve.

2. The hydraulic push-and-pull sub of the cable logging traction device as described in claim 1, characterized in that, The high-pressure oil inlet and high-pressure oil outlet of the first hydraulic oil pipeline and the pressure relief oil inlet of the second hydraulic oil pipeline are arranged on the vertical center line of the control compartment axis.

3. The hydraulic push-and-pull sub of the cable logging traction device as described in claim 1 or 2, characterized in that, The low-pressure chamber is equipped with a central connecting rod. The upper end of the central connecting rod is connected to the upper connector, and the lower end passes through the low-pressure chamber and is fixed on the hydraulic pump support of the hydraulic pump. The upper section of the central connecting rod has an oil hole, and the lower section is fitted with a spring piston. The internal part has a hollow oil passage, and the lower end has an oil passage hole. The low-pressure chamber is connected to the control chamber through the oil hole, the oil passage, and the oil passage hole.

4. The hydraulic push-and-pull sub of the cable logging traction device as described in claim 3, characterized in that, The chamber body corresponding to the spring piston of the low-pressure chamber is connected to the wellbore.

5. The hydraulic push-and-pull sub of the cable logging traction device as described in claim 3, characterized in that, The housing consists of an upper housing corresponding to the low-pressure chamber and a lower housing corresponding to the control chamber and the high-pressure chamber. The upper housing and the lower housing are fitted together with shear pin assemblies and limit pin assemblies along the circumferential direction. The hydraulic control assembly is connected to the high-pressure chamber and the lower housing via the fixed housing.

6. The hydraulic push-and-pull sub of the cable logging traction device as described in claim 5, characterized in that, The insertion depth at the connection between the hydraulic pump outlet and the hydraulic control component is less than the limiting distance of the limiting pin component.

7. The hydraulic push-and-pull sub of the cable logging traction device as described in claim 5 or 6, characterized in that, The shear pin assembly includes shear pin holes located at the joint between the upper and lower housings, shear pins inserted into the corresponding shear pin holes, and a shear pin cap fitted onto the upper end of the shear pin and threadedly connected to the lower housing.

8. The hydraulic push-and-pull sub of the cable logging traction device as described in claim 5 or 6, characterized in that, The limiting pin assembly includes a pin hole and a limiting pin hole located at the joint between the upper and lower housings, and a limiting pin inserted into the pin hole and the limiting pin hole respectively.

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