Device for preventing the dropping of a quick coupling of a logging cable

Abstract

The utility model relates to a device for preventing the quick joint of well logging cable from falling, which comprises a device body axially limitedly connected with the quick joint of well logging cable, the device body is sleeved on the well logging cable, a clamping body composed of at least two clamping blocks is arranged in the guide sliding groove of the device body, the clamping body composed of the clamping blocks is attached to and surrounds the outside of the well logging cable, a pressure applying assembly is further arranged in the device body, and the pressure applying assembly is used to promote the clamping body to tightly hold the well logging cable when relative movement occurs between the well logging cable and the quick joint. The utility model achieves the purpose of preventing the quick joint from separating from the cable, thereby realizing the function of preventing falling, and further reducing the phenomenon of falling into the well during the well logging fishing operation of downhole equipment, thereby providing protection for safe production. The setting of the utility model realizes the double holding purpose of passive holding first and active holding later, and ensures the quickness and reliability of the holding process.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas logging technology, specifically relating to a device for preventing the quick connector of logging cables from falling off. Background Technology

[0002] In existing technologies, the main method to prevent logging cable quick-connect couplings from falling into the well is through a cone-shaped frame assembly. However, if the cone-shaped frame assembly fails and there is no secondary anti-fall-in device, the logging cable quick-connect coupling will detach from the logging cable and fall into the well. Therefore, there is an urgent need for a device to prevent quick-connect couplings from falling out, in order to hold the logging cable securely after the cone-shaped frame assembly fails, thereby preventing the quick-connect coupling and equipment from falling into the well. Utility Model Content

[0003] In order to solve all or some of the above problems, the purpose of this utility model is to provide a device for preventing the quick connector of logging cable from falling off. The device of this utility model achieves the purpose of preventing the quick connector from detaching from the cable, thereby realizing the anti-drop function and providing a guarantee for safe production.

[0004] According to one aspect of the present invention, a device for preventing the quick connector of a logging cable from falling off is provided, comprising a device body axially limited and connected to the quick connector of the logging cable, the device body being sleeved on the outside of the logging cable, a clamping body composed of at least two clamping blocks being provided in the guide groove of the device body, the clamping body composed of the clamping blocks being abutting and surrounding the outside of the logging cable, and a pressure applying component being provided in the device body, the pressure applying component being used to cause the clamping body to grip the logging cable tightly when relative movement occurs between the logging cable and the quick connector.

[0005] Furthermore, the pressure application assembly includes at least two pressure application blocks. An elastic element is provided between each clamping block and its corresponding pressure application block. When relative movement occurs between the logging cable and the quick connector, the pressure application block compresses the elastic element, causing the clamping body to passively grip the logging cable. Each clamping block has a first damping layer on its side closest to the logging cable, which contacts the logging cable. The upper surface of the guide groove is an inclined first guide surface, and the upper end of the pressure application block is a first inclined surface that cooperates with the first guide surface. The pressure application block compresses the elastic element through the cooperation of the first guide surface and the first inclined surface. Before relative movement occurs between the logging cable and the quick connector, each clamping block has a first gap between itself and the device body at its upper end. After the clamping body passively grips the logging cable, the pressure application block can only move in the radial direction.

[0006] Furthermore, the upper end of the device body is provided with a locking ring cavity, and the upper end of each clamping block is provided with a snap-in section corresponding to the locking ring cavity. An elastic buffer is provided on the upper end of the snap-in section and / or on the bottom of the groove of the locking ring cavity. The resistance generated by the first damping layer is greater than the restoring force of the elastic buffer.

[0007] Furthermore, the locking ring cavity is a cone shape with a diameter that gradually decreases from the opening to the bottom of the groove. The snap-in section cooperates with the cone-shaped locking ring cavity. A second damping layer is provided on the inner ring surface of the locking ring cavity and / or the outer surface of the snap-in section. The second damping layer is used to prevent relative movement between the snap-in section and the locking ring cavity after the snap-in section extends into the locking ring cavity and contacts the locking ring cavity. The sum of the resistance generated by the first damping layer and the second damping layer is greater than the restoring force of the elastic buffer. A guide ring is also provided in the locking ring cavity. The guide ring is located between the second damping layer and the device body. The radial pressure of the device body on the clamping body is applied to the clamping body through the guide ring.

[0008] Furthermore, each of the clamping blocks includes an inner block and an outer block, the first damping layer is disposed on the side of the inner block that contacts the logging cable, a buffer misalignment layer is disposed between the inner block and the outer block, and the elastic element is disposed between the outer block and the pressure block.

[0009] Furthermore, an induction control module is provided in the axial gap between the quick connector and the device body. The induction control module is connected to a pressure trigger module. The induction control module is used to detect the pressure between the quick connector and the device body, and controls the pressure trigger module after the electrical signal corresponding to the pressure exceeds a preset threshold, so that the pressure trigger module pushes the pressure block to compress the elastic element, thereby causing the clamping body to actively hold the logging cable.

[0010] Furthermore, a limiting ring groove is provided at the lower end of the device body, and a limiting retaining ring is fixedly connected to the upper end of the quick connector. The limiting retaining ring includes a head and a neck with a diameter smaller than that of the head. A retaining ring with an inner diameter smaller than the outer diameter of the head of the limiting retaining ring is fixedly connected to the lower end of the limiting ring groove. The retaining ring is fitted onto the neck of the limiting retaining ring, and the head of the limiting retaining ring is axially limited within the limiting ring groove between the device body and the retaining ring. The sensing control module is disposed within the axial gap between the limiting retaining ring and the retaining ring. An elastic pad is sandwiched within the axial gap between the limiting retaining ring and the retaining ring, and the sensing control module is embedded within the elastic pad.

[0011] Furthermore, the sensing control module includes a pressure sensor disposed in the axial gap between the quick connector and the device body. The pressure sensor is used to detect the pressure between the quick connector and the device body. The pressure sensor is connected to a control circuit, which is used to receive the electrical signal corresponding to the pressure detected by the pressure sensor and control the pressure triggering module after the electrical signal corresponding to the pressure exceeds the threshold.

[0012] Furthermore, the pressure triggering module includes an elastic bladder. The control circuit is used to stimulate the chemical substance in the elastic bladder with electrodes after the electrical signal exceeds the threshold, so that the chemical substance in the elastic bladder undergoes a chemical reaction to generate gas, thereby causing the elastic bladder to expand. The elastic bladder is disposed in the guide groove and located below the pressure block. After the elastic bladder expands, it pushes the pressure block to compress the elastic element.

[0013] Furthermore, a push block is provided inside the guide groove. The push block is sleeved outside the logging cable. The upper end surface of the push block is an inclined second guide surface. The lower end of the pressure block is a second inclined surface that cooperates with the second guide surface. The push block is disposed between the elastic bladder and the pressure block. After the elastic bladder expands, it pushes the push block to move upward. The upward movement of the push block pushes the pressure block to compress the elastic element through the cooperation of the second guide surface and the second inclined surface.

[0014] As can be seen from the above technical solution, the device for preventing the quick connector of a logging cable from falling off, provided by this utility model, has the following beneficial effects:

[0015] This utility model achieves the purpose of preventing quick connectors from detaching from the cable, thereby realizing the function of preventing them from falling off, and thus reducing the phenomenon of downhole equipment falling into the well during logging and retrieval operations, providing a guarantee for safe production;

[0016] The design of this utility model achieves the dual purpose of first passively hugging and then actively hugging, ensuring that the hugging process is fast and reliable. The passive hugging reacts faster, and the active hugging makes the final degree of hugging more controllable, thus ensuring a firm hug. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a device for preventing the quick connector of a logging cable from falling off, according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 for Figure 1 A magnified view of a section at point B in the middle;

[0020] Figure 4 This is a block diagram showing the connection between the pressure sensor and the control circuit.

[0021] The attached figures are labeled as follows: 1. Logging cable; 2. Device body; 3. Pressure block; 4. Guide groove; 5. Push block; 6. Elastic bladder; 7. Limiting ring; 8. Elastic pad; 9. Pressure sensor; 10. Guide ring; 11. First damping layer; 12. Buffer misalignment layer; 13. Outer block; 14. Inner block; 15. Conical frame assembly; 16. Quick connector; 17. Axial clearance; 18. Second damping layer; 19. Second guide surface; 20. First guide surface; 21. Elastic element; 22. Control circuit. Detailed Implementation

[0022] To better understand the purpose, structure, and function of this utility model, the following detailed description, in conjunction with the accompanying drawings, provides a device for preventing the quick connector of a logging cable from falling off.

[0023] like Figure 1 , Figure 2 As shown, this invention illustrates a device for preventing the quick connector of a logging cable from falling off, comprising a device body 2 axially limited and connected to the quick connector 16 of the logging cable 1. The device body 2 is sleeved on the outside of the logging cable 1. A clamping body composed of at least two clamping blocks is provided in the guide groove 4 of the device body 2. The clamping body composed of clamping blocks abuts and surrounds the outside of the logging cable 1. A pressure-applying component is also provided in the device body 2. The pressure-applying component is used to cause the clamping body to grip the logging cable 1 tightly when relative movement occurs between the logging cable 1 and the quick connector 16.

[0024] Specifically, the logging cable 1 is fixed inside the quick connector 16 by a cone-shaped frame assembly 15. The cone-shaped frame assembly 15 can use an existing structure. The device in this embodiment includes a device body 2, which is sleeved on the logging cable 1. The lower end of the device body 2 is axially limited to the quick connector 16 below it. The axial limit connection means that the displacement of the device body 2 in the axial direction is restricted by the quick connector 16. The pressure application component is set inside the device body 2. In this embodiment, the pressure application component is used to cause the clamping body to hug the logging cable 1 when relative movement occurs between the logging cable 1 and the quick connector 16. The clamping body is set in the guide groove 4 of the device body 2. Therefore, after the clamping body hugs the logging cable 1, it also restricts the movement of the device body 2 outside it, so that the quick connector 16 cannot move axially relative to the device body 2, thus preventing the equipment from falling into the well.

[0025] Furthermore, the device body 2 in this embodiment increases the mating length between the quick connector 16 and the cable, and the clamping body surrounds and hugs the cable, further providing additional cable clamping force. This makes the connection between the cable and the quick connector 16 tighter, thereby enabling the logging cable 1 to withstand greater tension. This prevents the logging cable 1 and the quick connector 16 from separating when they are subjected to opposite forces at their connection point, thereby reducing the phenomenon of downhole equipment falling into the well during logging and retrieval operations.

[0026] At least two clamping blocks are evenly surrounding and abutting the outside of the logging cable 1. That is, the clamping body composed of clamping blocks is initially in a state of holding the logging cable 1, thereby providing additional cable clamping force. When relative movement occurs between the logging cable 1 and the quick connector 16, the clamping body composed of clamping blocks can further hold the logging cable 1 through the pressure application component. After holding, the upward pulling force of the logging cable 1 and the combined action of the weight of the equipment below and the logging cable 1 make this locking effect more reliable.

[0027] In specific implementation, for example, the device body 2 includes two semi-cylindrical clamping blocks, which are spliced ​​together to form a spindle-shaped whole. The whole formed by the splicing of the two clamping blocks is axially limited and connected to the quick connector 16. The two clamping blocks are connected by multiple sets of screws to form a ring. That is, by tightening the screws, the device body 2 formed by the clamping blocks also holds the logging cable 1 tightly. In other words, the device body 2 in this embodiment also has a radial force on the logging cable 1, thereby providing additional clamping force for the logging cable 1, which effectively reduces the possibility of the logging cable 1 falling into the well. In turn, it cooperates with the original cone frame assemblies 15 to achieve a double anti-drop function. The outer diameter of the whole formed by the splicing of the two clamping blocks is consistent with that of the quick connector 16, thereby improving its passability and reducing the risk of pre-sticking downhole.

[0028] Based on this, considering that the original cone-shaped frame assembly 15, when the clamping force is effective and sufficient, is sufficient to ensure a firm connection between the cable and the quick connector 16, and that the quick connector 16 may fall into the well only under special circumstances such as failure or insufficient clamping force of the cone-shaped frame assembly 15 or excessive cable tension, a pressure-applying assembly and a clamping body are added. The pressure-applying assembly only causes the clamping body to pressurize and tighten the logging cable 1 when there is relative movement between the logging cable 1 and the quick connector 16, thereby reducing the possibility of the quick connector 16 falling into the well. During normal logging operations, the clamping body and the device body 2 only provide a certain resistance to the logging cable 1. This resistance slightly improves the connection strength between the quick connector 16 and the logging cable 1, while also providing sufficient reaction time for the clamping body to tighten the logging cable 1 under special circumstances. This avoids damage to the logging cable 1 caused by the clamping body tightening the logging cable 1 for a long time with high intensity, and avoids affecting the service life of the logging cable 1.

[0029] The pressure application assembly includes at least two pressure application blocks 3. Each clamping block and its corresponding pressure application block 3 are provided with an elastic element 21. When relative movement occurs between the logging cable 1 and the quick connector 16, the pressure application block 3 compresses the elastic element 21 to cause the clamping body to passively grip the logging cable 1. Each clamping block has a first damping layer 11 that contacts the logging cable 1 on the side closest to it. The upper end of the guide groove 4 is an inclined first guide surface 20. The upper end of the pressure application block 3 is a first inclined surface that cooperates with the first guide surface 20. The pressure application block 3 compresses the elastic element 21 through the cooperation of the first guide surface 20 and the first inclined surface. Before relative movement occurs between the logging cable 1 and the quick connector 16, each clamping block and its upper end of the device body 2 have a first gap. After the clamping body passively grips the logging cable 1, the pressure application block 3 can only move in the radial direction.

[0030] Specifically, the lower end of the device body 2 is axially limited and connected to the quick connector 16. At least two pressure blocks 3 are provided in the device body 2 corresponding to the clamping block. The inner side of the pressure block 3 is connected to the outer side of the corresponding clamping body through the elastic element 21. When relative movement occurs between the logging cable 1 and the quick connector 16, the pressure block 3 compresses the elastic element 21 to cause the clamping body to passively hug the logging cable 1.

[0031] Each clamping block has a first damping layer 11 on the side near the logging cable 1, which contacts the logging cable 1. The first damping layer 11 is used to provide resistance between the clamping block and the logging cable 1 to prevent relative movement between them. This resistance makes the clamping block be regarded as being in the same state as the logging cable 1. That is, the clamping block will not move when the device body 2 falls with the quick connector 16. Therefore, the first gap between each clamping block and the device body 2 above it is set to allow the device body 2 to fall smoothly with the quick connector 16.

[0032] As the device body 2 falls with the quick connector 16, the first guide surface 20 comes into contact with the first inclined surface. As the device body 2 continues to fall, the first guide surface 20 continues to push the first inclined surface. In this embodiment, the distance between the first guide surface 20 and the axis of the logging cable 1 gradually decreases from bottom to top. Therefore, the first guide surface 20 pushes the first inclined surface, causing the pressure block 3 to move towards the logging cable 1. That is, the pressure block 3 compresses the elastic element 21. The compression of the elastic element 21 by the pressure block 3 causes the clamping body to passively hold the logging cable 1. That is, after the device body 2 moves down to the position of contact with the clamping block, the device body 2 can no longer move down, thereby preventing the device body 2 and the quick connector 16 from falling.

[0033] Regarding the pressure block 3, after the clamping body passively grips the logging cable 1, the pressure block 3 can only move in the radial direction. That is, after the device body 2 moves down to the position of contact with the clamping block, the pressure block 3 can only move in the radial direction and cannot move in the axial direction. Furthermore, since the first guide surface 20 restricts the movement of the pressure block 3 away from the logging cable 1 in the radial direction, the pressure block 3 cannot release the elastic element 21 at this time, thus achieving the purpose of stable clamping and the expected purpose of preventing drop.

[0034] The upper end of the device body 2 is provided with a locking ring cavity, and the upper end of each clamping block is provided with a snap-in section corresponding to the locking ring cavity. An elastic buffer is provided on the upper end of the snap-in section and / or the bottom of the groove of the locking ring cavity. The resistance generated by the first damping layer 11 is greater than the restoring force of the elastic buffer.

[0035] Specifically, a locking ring cavity is provided at the upper end of the guide groove 4 away from the quick connector 16. Each clamping block has a corresponding locking section at its upper end. When the quick connector 16 and the device body 2 are installed on the logging cable 1 and the quick connector 16 does not move downward relative to the logging cable 1, there is the aforementioned first gap between the upper end of the locking section and the bottom of the locking ring cavity. This first gap is used to provide space for the movement of the device body 2 when it moves relative to the logging cable 1 with the quick connector 16. When the device body 2 moves relative to the logging cable 1 with the quick connector 16, the downward locking section of the device body 2 gradually enters the locking ring cavity, and the closest locking section contacts the locking ring cavity. The elastic buffer in this embodiment is used to offset the interaction force between the two parts with different speeds, thereby buffering the collision between the device body 2 and the clamping block.

[0036] Finally, the snap-in section is fully snapped into the locking ring cavity. At this time, the elastic buffer has an elastic restoring force on the snap-in section, which ensures the stability and firmness of the clamping block snapping into the locking ring cavity, so as to achieve the expected locking effect of the clamping block holding the logging cable 1. In this embodiment, the resistance generated by the first damping layer 11 is greater than the restoring force of the elastic buffer.

[0037] The locking ring cavity is a cone shape with a diameter that gradually decreases from the opening to the bottom of the groove. The snap-in section cooperates with the cone-shaped locking ring cavity. That is, all the snap-in sections are spliced ​​together to form a structure that cooperates with the cone shape of the locking ring cavity. A second damping layer 18 is provided on the inner ring surface of the locking ring cavity and / or the outer surface of the snap-in section. The second damping layer 18 is used to prevent relative movement between the two after the snap-in section extends into the locking ring cavity and contacts the locking ring cavity. The sum of the resistance generated by the first damping layer 11 and the second damping layer 18 is greater than the restoring force of the elastic buffer.

[0038] The locking ring cavity is a cone shape whose diameter gradually decreases from the opening to the bottom of the groove. In this embodiment, the snap-in sections of all the clamping blocks are spliced ​​together to form a structure that fits into the cone shape of the locking ring cavity.

[0039] Specifically, after the snap-in section is fully located in the locking ring cavity, the snap-in section compresses the first damping layer 11 and the second damping layer 18 on both sides. The sum of the resistance generated by the first damping layer 11 and the second damping layer 18 is much greater than the restoring force of the elastic buffer, thereby ensuring the stability and firmness of the inner plate layer snapping into the locking ring cavity, so as to achieve the expected locking effect.

[0040] The locking ring cavity is also provided with a guide ring 10, which is located between the second damping layer 18 and the device body 2. The radial pressure of the device body 2 on the clamping body is applied to the clamping body through the guide ring 10.

[0041] In this embodiment, the guide ring 10 is disposed between the device body 2 and the second damping layer 18. Therefore, after the device body 2 moves down to the lower limit position, the radial pressure of the device body 2 on the clamping body is applied to the clamping body through the guide ring 10. Thus, the arrangement of the guide ring 10 in this embodiment prevents the clamping block from moving away from the logging cable 1, so that the clamping block can only be firmly clamped on the outside of the logging cable 1, thereby achieving the purpose of firm clamping and the expected anti-detachment effect.

[0042] Each clamping block includes an inner block 14 and an outer block 13. A first damping layer 11 is disposed on the side of the inner block 14 that contacts the logging cable 1. A buffer misalignment layer 12 is disposed between the inner block 14 and the outer block 13. An elastic element is disposed between the outer block 13 and the pressure block 3.

[0043] In this embodiment, each clamping block has an outer block 13 and an inner block 14. The inner plate of multiple clamping blocks surrounds and holds the logging cable 1, while the outer plate is connected to the corresponding pressure block 3 through an elastic element. The inner plate and the outer plate are elastically connected through a buffer misalignment layer 12. The setting of the buffer misalignment layer 12 allows the inner block 14 and the outer block 13 to move a certain distance along the axial direction, but the two remain connected to each other. Therefore, during the process of the device body 2 falling with the quick connector 16, the device body 2, through the cooperation of the first guide surface 20 and the first inclined surface, will push the clamping block and the outer block 13 to move down on the one hand, and push the clamping block to compress the elastic element on the other hand. At this time, the outer block 13 and the inner block 14 are in an axially misaligned state, which can buffer the failure of the cone frame clamping force, or the insufficient clamping force of the cone frame, resulting in the force generated by the clamping body on the logging cable 1 when the quick connector 16 and the device body 2 fall. That is, this setting can buffer the huge stress generated by the clamping body holding the logging cable 1 at the moment of falling.

[0044] At the moment when the device body 2 falls with the quick connector 16, the pressure block 3 and the outer block 13 can move down with the device body 2 at the same time to avoid excessive clamping force at the moment of falling. After the device body 2 moves down to the point where the insertion section is located in the locking ring cavity, the clamping force of the clamping block on the logging cable 1 is at its maximum.

[0045] Among them, such as Figure 3 As shown, an induction control module is provided in the axial gap 17 between the quick connector 16 and the device body 2. The induction control module is connected to a pressure trigger module. The induction control module is used to detect the pressure between the quick connector 16 and the device body 2. After the electrical signal corresponding to the pressure exceeds the preset threshold, the induction control module controls the pressure trigger module to push the pressure block 3 to compress the elastic element 21, so as to cause the clamping body to actively hug the logging cable 1.

[0046] In this embodiment, the sensing control module is used to detect the pressure between the quick connector 16 and the device body 2, and to control the pressure triggering module. The pressure triggering module is used to push the pressure block 3 to compress the elastic element 21, so as to cause the clamping body to actively hold the logging cable 1.

[0047] In this embodiment, if the clamping force of the cone-shaped frame assembly 15 fails or is insufficient, the quick connector 16 will exhibit a significant downward tendency relative to the logging cable 1 due to the device's own gravity. Since the device body 2 is axially limited to the quick connector 16, the device body 2 will also exhibit a downward tendency relative to the logging cable 1. However, due to the resistance of the internal clamping body and the device body 2 to the cable, and the axial gap 17 between the device body 2 and the quick connector 16, the degree of descent of the device body 2 and the quick connector 16 relative to the logging cable 1 is not consistent. Consequently, the axial gap 17 between the device body 2 and the quick connector 16 gradually decreases, and the pressure detected by the sensing control module gradually increases, thereby achieving active clamping through the pressure triggering module.

[0048] Based on the analysis of the aforementioned falling process of the quick connector 16 and the device body 2, it can be seen that after the quick connector 16 falls, the device body 2 overcomes the resistance between itself and the logging cable 1 and moves downward. The axial gap 17 between the device body 2 and the quick connector 16 gradually decreases. During the downward movement of the device body 2 overcoming the resistance between itself and the logging cable 1, the pressure block 3 is driven to compress the elastic element 21 through the cooperation of the first guide surface 20 and the first inclined surface. At this time, the clamping block begins to passively clamp the logging cable 1. As the axial gap 17 between the device body 2 and the quick connector 16 gradually decreases, the pressure between the quick connector 16 and the device body 2 detected by the sensing control module gradually increases. When the pressure increases to a preset threshold, the pressure triggering module is triggered, and the clamping body begins to actively clamp the logging cable 1. Therefore, the setting of this embodiment achieves the dual clamping purpose of first passive clamping and then active clamping, ensuring that the clamping process is fast and reliable. The passive clamping reacts faster, and the active clamping has more control over the final clamping degree, thereby ensuring a firm clamping.

[0049] The device body 2 has a limiting ring groove at its lower end, and a limiting ring 7 is fixedly connected to the upper end of the quick connector 16. The limiting ring 7 includes a head and a neck with a diameter smaller than that of the head. A retaining ring with an inner diameter smaller than the outer diameter of the head of the limiting ring 7 is fixedly connected to the lower end of the limiting ring groove. The retaining ring is fitted onto the neck of the limiting ring 7, and the head of the limiting ring 7 is axially limited in the limiting ring groove between the device body 2 and the retaining ring. The sensing control module is set in the axial gap 17 between the limiting ring 7 and the retaining ring. An elastic pad 8 is sandwiched in the axial gap 17 between the limiting ring 7 and the retaining ring, and the sensing control module is embedded in the elastic pad 8.

[0050] For the axial limiting connection between the quick connector 16 and the device body 2, in this embodiment, the lower end of the device body 2 is provided with a limiting ring groove, and the upper end of the quick connector 16 is fixedly connected to a limiting retaining ring 7. The limiting retaining ring 7 includes a head with a larger diameter and a neck with a smaller diameter than the head. The head of the limiting retaining ring 7 is located in the limiting ring groove, and a retaining ring is sleeved on the neck of the limiting retaining ring 7. The retaining ring is fixedly connected to the lower end of the limiting ring groove. The inner diameter of the retaining ring is smaller than the outer diameter of the head of the limiting retaining ring 7. Thus, the head of the limiting retaining ring 7 is limited in the limiting ring groove by the fixed connection between the retaining ring and the limiting ring groove.

[0051] As an alternative to this embodiment, the limiting ring 7 can be fixedly connected to the lower end of the device body 2, the limiting ring groove can be set at the upper end of the quick connector 16, and the retaining ring can be connected to the quick connector 16.

[0052] In this embodiment, an elastic pad 8 is sandwiched between the limiting ring groove and the limiting retaining ring 7. The elastic pad 8 can clearly reflect the change in the axial gap 17 between the device body 2 and the quick connector 16. Thus, the sensing control module is embedded in the elastic pad 8, which enables the sensing control module to accurately sense the pressure change between the two.

[0053] The sensing control module includes a pressure sensor 9 disposed in the axial gap 17 between the quick connector 16 and the device body 2. The pressure sensor 9 is used to detect the pressure between the quick connector 16 and the device body 2. The pressure sensor 9 is connected to a control circuit, which is used to receive the electrical signal corresponding to the pressure detected by the pressure sensor 9, and to control the pressure triggering module after the electrical signal corresponding to the pressure exceeds a threshold.

[0054] Specifically, the pressure sensor 9's pressure signal output terminal is electrically connected to the signal receiving terminal of the control circuit, so that the control circuit can receive the electrical signal corresponding to the pressure detected by the pressure sensor 9. For the pressure sensor, select the appropriate range as needed, and it can be directly installed and used after purchase.

[0055] This also includes power supplies, such as... Figure 4 As shown, the positive and negative terminals of the power supply are connected to the pressure sensor 9 and the control circuit 22, respectively. The power supply is used to power the pressure sensor 9 and the control circuit 22. The positive and negative signals output by the pressure sensor are input to the control circuit, respectively. The pressure sensor is a four-wire pressure sensor that includes two power lines and two signal lines.

[0056] The pressure triggering module includes an elastic bladder 6. The control circuit is used to stimulate the chemical substances in the elastic bladder with electrodes after the electrical signal exceeds the threshold, so that the chemical substances in the elastic bladder will react chemically to produce gas, thereby causing the elastic bladder 6 to expand. The elastic bladder 6 is set in the guide groove 4 and located below the pressure block 3. After the elastic bladder 6 expands, it pushes the pressure block 3 to compress the elastic element 21.

[0057] In this embodiment, the pressure triggering module includes an elastic bladder 6, which is located in the guide groove 4 of the device body 2. The elastic bladder 6 can adopt a structure similar to an airbag. When not triggered, the elastic bladder 6 is placed in the guide groove 4 in a folded state. The elastic bladder 6 is filled with chemical substances such as sodium azide or ammonium nitrate. After the pressure sensor 9 transmits the pressure value it senses to the control circuit, the control circuit determines whether the electrical signal corresponding to the pressure value exceeds the threshold. If it exceeds the threshold, the control circuit sends a control command to trigger the electrode. After the electrode comes into contact with the chemical substance in the elastic bladder, the electrical energy of the electrode stimulates the chemical substance in the elastic bladder, causing the chemical substance in the elastic bladder 6 to undergo a rapid chemical reaction, producing a large amount of nitrogen gas. The generation of nitrogen gas causes the elastic bladder 6 to expand rapidly until it fills the guide groove 4, thereby pushing the pressure block 3 to compress the elastic element 21 and complete the expected pressure action.

[0058] The setup in this embodiment has the advantages of fast trigger response, fast clamping speed, and long-lasting and stable pressure retention after clamping in place.

[0059] The guide groove 4 is equipped with a push block 5, which is sleeved on the outside of the logging cable 1. The upper end of the push block 5 is an inclined second guide surface 19, and the lower end of the pressure block 3 is a second inclined surface that cooperates with the second guide surface 19. The push block 5 is located between the elastic bladder 6 and the pressure block 3. After the elastic bladder 6 expands, it pushes the push block 5 to move upward. The upward movement of the push block 5 pushes the pressure block 3 to compress the elastic element 21 through the cooperation of the second guide surface 19 and the second inclined surface.

[0060] Specifically, the push block 5 is axially slidably disposed in the guide groove 4, which is located inside the device body 2. The contact surface between the push block 5 and the pressure block 3 is an inclined driving surface that slides relative to each other. This surface is used to push the pressure block 3 closer to the corresponding clamping body when the push block 5 slides towards the pressure block 3. The upper end surface of the push block 5 is an inclined second guide surface 19. From bottom to top, the distance between the second guide surface 19 and the axis of the logging cable 1 gradually increases. Thus, the push block 5 moves upward and, through the cooperation of the second guide surface 19 and the second inclined surface, compresses the elastic element of the pressure block 3 towards the clamping block.

[0061] Combining the first guide surface 20 and the second guide surface 19, along the direction away from the axis of the logging cable 1, the distance between the first guide surface 20 and the second guide surface 19 gradually decreases. The corresponding pressure block 3 is a trapezoidal structure with a first inclined surface and a second inclined surface, and the first inclined surface is located above the second inclined surface. The second inclined surface, as the driving surface, contacts the second guide surface 19 of the push block 5, and the first inclined surface, as the driving surface, contacts the first guide surface 20 of the device body 2. The power of the push block 5 to push the pressure block 3 comes from the trigger-type power source of the pressure trigger module. The power of the device body 2 to push the pressure block 3 comes from the action of the quick connector 16 causing the device body 2 to fall away from the logging cable 1. The two power directions are exactly opposite and act on the pressure block 3 at the same time, so that the pressure block 3 quickly compresses the elastic element and approaches the clamping body, thereby realizing the process of rapid response and rapid pressure tightening.

[0062] In specific implementation, for example, the acute angle between the first guide surface 20 and the axis of the logging cable 1 is smaller than the acute angle between the second guide surface 19 and the axis of the logging cable 1.

[0063] The specific application of the device for preventing the quick connector 16 of the logging cable 1 from falling off according to this embodiment of the present invention is described below:

[0064] During logging, the cone-shaped frame assembly 15 provides clamping force to the logging cable 1, and connects the cone-shaped frame assembly 15 to the quick connector 16. The device of this utility model embodiment is added at the connection between the logging cable 1 and the quick connector 16, and the device body 2 provides reverse resistance to the logging cable 1 to enhance the tension bearing capacity of the quick connector 16.

[0065] When the clamping force of the cone-shaped frame assembly 15 on the logging cable 1 fails or is insufficient, the clamping body of this utility model embodiment surrounds and holds the logging cable 1 tightly, thereby providing additional clamping force for the logging cable 1.

[0066] Specifically, the damping force between the device body 2 and the logging cable 1 is used to prevent the relative separation between the device body 2 and the logging cable 1 when the logging cable 1 and the quick connector 16 move away from each other, thus causing the quick connector 16 and the device body 2 to tend to move away from each other. The sensing control module senses the tendency of the quick connector 16 and the device body 2 to move away from each other and triggers the pressure application module, thereby applying further pressure on the basis of the original damping force of the device body 2, so that the clamping body surrounds and hugs the logging cable 1, thereby achieving anti-fall-in-well control.

[0067] Specifically, after the quick connector 16 descends, the device body 2 overcomes the resistance between itself and the logging cable 1 and moves downward. The downward movement of the device body 2 will correspondingly drive the pressure block 3 to compress the elastic element 21 through the cooperation of the first guide surface 20 and the first inclined surface. At this time, the clamping block begins to passively hold the logging cable 1. As the axial gap 17 between the device body 2 and the quick connector 16 gradually decreases, the pressure between the quick connector 16 and the device body 2 detected by the sensing control module gradually increases. When the pressure increases to the preset threshold, the pressure triggering module is triggered, and the clamping body begins to actively hold the logging cable 1.

[0068] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0069] Furthermore, the terms "a," "two," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0070] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for preventing the quick connector of a logging cable from falling off, characterized in that, The device body includes a device body that is axially limited and connected to a quick connector of a logging cable. The device body is fitted over the logging cable. A clamping body composed of at least two clamping blocks is provided in the guide groove of the device body. The clamping body composed of the clamping blocks abuts against and surrounds the outside of the logging cable. The device body also includes a pressure-applying component, which is used to cause the clamping body to grip the logging cable tightly when relative movement occurs between the logging cable and the quick connector.

2. The device for preventing the quick connector of a logging cable from falling off according to claim 1, characterized in that, The pressure application assembly includes at least two pressure application blocks. Each clamping block and its corresponding pressure application block are provided with an elastic element. When relative movement occurs between the logging cable and the quick connector, the pressure application block compresses the elastic element to cause the clamping body to passively hold the logging cable. Each clamping block has a first damping layer on the side near the logging cable that contacts the logging cable. The upper end surface of the guide groove is an inclined first guide surface. The upper end of the pressure application block is a first inclined surface that cooperates with the first guide surface. The pressure application block compresses the elastic element through the cooperation of the first guide surface and the first inclined surface. Before relative movement occurs between the logging cable and the quick connector, each clamping block and its upper end of the device body have a first gap. After the clamping body passively holds the logging cable, the pressure application block can only move in the radial direction.

3. The device for preventing the quick connector of logging cable from falling off according to claim 2, characterized in that, The upper end of the device body is provided with a locking ring cavity, and the upper end of each clamping block is provided with a snap-in section corresponding to the locking ring cavity. An elastic buffer is provided on the upper end of the snap-in section and / or the bottom of the groove of the locking ring cavity. The resistance generated by the first damping layer is greater than the restoring force of the elastic buffer.

4. The device for preventing the quick connector of logging cable from falling off according to claim 3, characterized in that, The locking ring cavity is a cone shape with a diameter that gradually decreases from the opening to the bottom of the groove. The snap-in section mates with the cone-shaped locking ring cavity. A second damping layer is provided on the inner ring surface of the locking ring cavity and / or the outer surface of the snap-in section. The second damping layer is used to prevent relative movement between the snap-in section and the locking ring cavity after the snap-in section extends into the locking ring cavity and contacts the locking ring cavity. The sum of the resistance generated by the first damping layer and the second damping layer is greater than the restoring force of the elastic buffer. A guide ring is also provided in the locking ring cavity. The guide ring is located between the second damping layer and the device body. The radial pressure of the device body on the clamping body is applied to the clamping body through the guide ring.

5. The device for preventing the quick connector of logging cable from falling off according to claim 2, characterized in that, Each clamping block includes an inner block and an outer block. The first damping layer is disposed on the side of the inner block that contacts the logging cable. A buffer misalignment layer is disposed between the inner block and the outer block. The elastic element is disposed between the outer block and the pressure block.

6. The device for preventing the quick connector of logging cable from falling off according to claim 2, characterized in that, A sensing control module is provided in the axial gap between the quick connector and the device body. The sensing control module is connected to a pressure triggering module. The sensing control module is used to detect the pressure between the quick connector and the device body. After the electrical signal corresponding to the pressure exceeds a preset threshold, the sensing control module controls the pressure triggering module to push the pressure block to compress the elastic element, so as to cause the clamping body to actively hold the logging cable.

7. The device for preventing the quick connector of a logging cable from falling off according to claim 6, characterized in that, The lower end of the device body is provided with a limiting ring groove, and the upper end of the quick connector is fixedly connected to a limiting ring. The limiting ring includes a head and a neck with a diameter smaller than that of the head. The lower end of the limiting ring groove is fixedly connected to a retaining ring with an inner diameter smaller than that of the head of the limiting ring. The retaining ring is fitted onto the neck of the limiting ring, and the head of the limiting ring is axially limited within the limiting ring groove between the device body and the retaining ring. The sensing control module is disposed within the axial gap between the limiting ring and the retaining ring. An elastic pad is sandwiched within the axial gap between the limiting ring and the retaining ring, and the sensing control module is embedded within the elastic pad.

8. The device for preventing the quick connector of a logging cable from falling off according to claim 6, characterized in that, The sensing control module includes a pressure sensor disposed in the axial gap between the quick connector and the device body. The pressure sensor is used to detect the pressure between the quick connector and the device body. The pressure sensor is connected to a control circuit, which is used to receive the electrical signal corresponding to the pressure detected by the pressure sensor and control the pressure triggering module after the electrical signal corresponding to the pressure exceeds the threshold.

9. The device for preventing the quick connector of a logging cable from falling off according to claim 8, characterized in that, The pressure triggering module includes an elastic bladder. The control circuit is used to stimulate the chemical substance in the elastic bladder with electrodes after the electrical signal exceeds the threshold, so that the chemical substance in the elastic bladder undergoes a chemical reaction to produce gas, thereby causing the elastic bladder to expand. The elastic bladder is disposed in the guide groove and located below the pressure block. After the elastic bladder expands, it pushes the pressure block to compress the elastic element.

10. The device for preventing the quick connector of a logging cable from falling off according to claim 9, characterized in that, A push block is provided inside the guide groove. The push block is sleeved on the logging cable. The upper end surface of the push block is an inclined second guide surface. The lower end of the pressure block is a second inclined surface that cooperates with the second guide surface. The push block is located between the elastic bladder and the pressure block. After the elastic bladder expands, it pushes the push block to move upward. The upward movement of the push block pushes the pressure block to compress the elastic element through the cooperation of the second guide surface and the second inclined surface.

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