Wellhead cable protective fixing device and use method thereof

Abstract

The invention relates to the technical field of wellhead cable fixing, and discloses a wellhead cable protective fixing device and a using method thereof.The wellhead cable protective fixing device comprises a wellhead mounting sleeve and a connecting frame, fixing mechanisms are symmetrically arranged on the inner side of the connecting frame, and each fixing mechanism comprises a uniform rectangular sleeve and an abutting plate; the tail end of the connecting arm A is rotationally connected with a clamping roller, the outer portion of the clamping roller is fixedly connected with a connecting arm B, the tail end of the connecting arm B is rotationally connected with a fixed clamping sleeve, and a sealing mechanism is arranged on the top of the well mouth mounting sleeve and comprises axially symmetric sealing blades. According to the invention, the clamping roller and the fixed clamping sleeve can be matched to carry out multi-point fixation on the cable through the dead weight of the cable and the weight of the logging instrument, the axial symmetry sealing blades can seal the channel through clockwise rotation of the top rotating ring, and the effect of multi-point clamping and fixing of the cable and the effect of sealing the channel are mutually restricted.

Description

Technical Field

[0001] The invention relates to the technical field of wellhead cable fixing, and in particular to a wellhead cable protective fixing device and a use method thereof. Background Art

[0002] In oil and gas wells, cables are used to transmit data or electricity of logging instruments and downhole control equipment. The protective fixing of cables at the oil and gas wellhead is related to the safety, reliability and normal operation of the cables and downhole equipment. Protective fixing of cables at the oil and gas wellhead can prevent the cables from moving and ensure the sealing of the wellhead, so as to avoid the cables from moving back and forth when subjected to large tension or mechanical stress, causing the cables to wear or break. It can also prevent the fluid in the oil and gas well from entering the wellhead equipment or ground facilities through the cable channel, and prevent external pollutants such as dust and rain from entering the well. That is, through reasonable protection and fixing, the safety and efficiency of the operation can be improved, and the service life of the cables and related equipment can be extended.

[0003] After searching, the Chinese invention patent with publication number CN114542001A discloses a wellhead cable fixing device, including a fixing unit, a locking unit, a stopper, a pressure unit and a clamp, wherein the fixing unit is used to be fixed on the wellhead spool, the locking unit is locked in the inner cavity of the fixing unit by the stopper, the pressure unit is connected to the first end of the fixing unit, the inner cavities of the pressure unit and the locking unit are used to allow the cable to pass through, the pressure unit is used to push the locking unit to move toward the second end of the fixing unit, the fixing unit is cylindrical, the inner diameter of the first end of the fixing unit is larger than the inner diameter of the second end of the fixing unit, the fixing unit includes at least two relatively connected cones, the outer wall shape of the locking unit is adapted to the inner cavity shape of the fixing unit, the inner diameter of the locking unit is smaller than the diameter of the cable, the locking unit includes at least two relatively arranged cone sleeves, and the clamp includes at least two relatively connected half rings. Compared with the prior art, the Chinese invention patent with publication number CN114542001A can prevent the instrument from driving the cable to fall rapidly into the well and causing damage to the instrument.

[0004] Although the above-mentioned wellhead cable fixing device can fix the cable through the locking unit to protect the logging instrument, the cable will generate a large pulling force on the fixing point due to its own weight and the logging instrument, that is, stress concentration is easy to occur at a single fixing point, which affects the service life of the cable; and because the channel between the wellhead and the cable is not sealed, dirt outside the well (such as sewage, mud or other impurities) can easily enter the well through the channel and affect the operation of the logging instrument. Therefore, a wellhead cable protective fixing device and a method of using the device are needed, which can fix the cable in sections to protect the cable and seal the channel between the wellhead and the cable to prevent dirt from entering. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that stress concentration is easy to occur at a single fixing point, thus affecting the service life of the cable, and the passage between the wellhead and the cable is not sealed, making it difficult to prevent dirt from entering. A wellhead cable protective fixing device and a method of using the same are proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A wellhead cable protective fixing device, comprising a wellhead installation sleeve installed on the outside of the wellhead and a connecting frame located inside the wellhead, a fixing mechanism for fixing the cable is symmetrically arranged on the inner side of the connecting frame, the fixing mechanism comprises a rectangular sleeve evenly embedded in the connecting frame and an abutment plate slidably connected to the inside of the rectangular sleeve, a connecting arm A is rotatably connected to the outside of the rectangular sleeve, a clamping roller is rotatably connected to the end of the connecting arm A, a connecting arm B is fixedly connected to the outside of the clamping roller, a fixing sleeve is rotatably connected to the end of the connecting arm B, an abutment block located at the bottom of the abutment plate is symmetrically fixedly connected to the outside of the connecting arm A, a connecting plate is fixedly connected between the evenly distributed abutment plates, and a driving ring is fixedly connected between the abutment plates located at the top; A sealing mechanism for sealing the passage between the wellhead and the cable is arranged on the top of the wellhead installation sleeve, and the sealing mechanism comprises sealing blades which are axially symmetrically distributed.

[0007] The above technical solution further includes: The wellhead mounting sleeve comprises an inner mounting ring sleeved on the inner side of the wellhead and an outer mounting ring sleeved on the outer side of the wellhead, a top connecting ring is fixedly connected between the inner mounting ring and the outer mounting ring, mounting holes are evenly opened on the outsides of the inner mounting ring and the outer mounting ring, the top of the top connecting ring is fixedly connected with an outer fixing ring, and the top of the outer fixing ring is fixedly connected with a top fixing ring; the inner mounting ring can be installed on the inner side of the wellhead and the outer mounting ring can be installed on the outer side of the wellhead 1 by using expansion bolts and mounting holes, thereby completing the installation of the wellhead mounting sleeve.

[0008] The connecting frame includes connecting rings evenly distributed inside the wellhead, connecting ribs are fixedly connected between the evenly distributed connecting rings, and the connecting rib located at the top is fixedly connected to the bottom of the inner mounting ring; the connecting frame can be fixed inside the wellhead by a wellhead mounting sleeve installed on the top of the wellhead.

[0009] The outside of the rectangular sleeve is provided with a lower opening for allowing the abutment block to deflect, the outside of the connecting arm A is provided with a middle opening for allowing the connecting arm B and the fixed jacket to pass through, and the connecting plate passes between the symmetrical abutment plates.

[0010] The abutment plate at the top passes through the top connecting ring, and a hydraulic cylinder is axially symmetrically installed at the bottom of the top fixing ring, and the output ends of the axially symmetrically distributed hydraulic cylinders are fixedly connected to the top of the driving ring; by pressurizing and filling the hydraulic cylinders with oil, the driving ring can drive the axially symmetrical abutment plate to move downward, so as to drive the clamping roller to deflect and clamp the cable through the abutment block, so as to promote the subsequent fixing sleeve to fix the cable.

[0011] The sealing mechanism also includes a top rotating ring movably connected above the top fixing ring and an arc-shaped limiting guide rail axially symmetrically embedded in the top of the top fixing ring, the bottom of the top rotating ring is axially symmetrically provided with an execution driving slide groove, the internal sliding connection of the execution driving slide groove is provided with a slider fixedly connected to the top of the sealing blade, the internal movably connected of the arc-shaped limiting guide rail is provided with a limiting shaft pin fixedly connected to the bottom of the sealing blade, the rotation of the top rotating ring can cause the axially symmetrical sealing blade to rotate to form a circular center hole; the center hole formed by the rotation of the axially symmetrical sealing blade can be changed by rotating the top rotating ring.

[0012] The sealing mechanism also includes an outer rotating ring rotatably connected to the outside of the top fixing ring and a vertical groove axially symmetrically arranged on the outside of the outer fixing ring. The outer side of the outer rotating ring is axially symmetrically provided with an inclined groove. The interior of the inclined groove is slidably connected with a linkage rod passing through the vertical groove and fixedly connected to the outside of the driving ring. When the driving ring drives the linkage rod to move downward, the inclined groove can drive the outer rotating ring to rotate counterclockwise, and vice versa. The bottom of the top rotating ring is fixedly connected with an inner connecting ring located inside the outer rotating ring, the inner side of the outer rotating ring is axially symmetrically provided with a driving groove extending to the top thereof, the outer side of the inner connecting ring is axially symmetrically provided with a receiving groove, the interior of the receiving groove is slidably connected with a one-way driving block located inside the driving groove, and a reset spring is fixedly connected between the one-way driving block and the receiving groove; the outer rotating ring and the inner connecting ring can be synchronously rotated clockwise through the one-way driving block axially symmetrically, so as to prevent the driving ring from moving upward to weaken the function of clamping and fixing the cable, and the counterclockwise rotation of the top rotating ring to weaken the function of the sealing channel; An L-shaped limit plate for preventing the top rotating ring from detaching is symmetrically fixedly connected to the outer axis of the outer rotating ring; a block can be added between the top rotating ring and the L-shaped limit plate or a wellhead blowout preventer can be installed on the inner side of the inner mounting ring to prevent the top rotating ring from being impacted by the fluid inside the wellhead and losing its sealing effect on the channel.

[0013] Based on the above-mentioned method for using a wellhead cable protective fixing device, the method includes the following steps: S1: Pre-installation: Use a hoisting machine to lift the connection frame into the wellhead and lift the wellhead installation sleeve to the top of the wellhead, and then use expansion bolts to fasten the wellhead installation sleeve to the top of the wellhead; S2: Cable clamping: The hydraulic cylinder is pressurized and filled with oil through the hydraulic pump to drive the driving ring to move downward, so that the connecting arm A drives the clamping roller to rotate inward to clamp the cable, thereby achieving multi-point clamping of the cable; S3: Cable fixing: The cable is released so that the cable drives the axisymmetric clamping roller to rotate inward due to its own weight and the logging instrument, so that the connecting arm B drives the fixing jacket to rotate upward to fix the cable, thereby achieving multi-point fixing of the cable; S4: Channel sealing: The axisymmetric sealing blades rotate to seal the channel between the wellhead and the cable by rotating the top rotating ring clockwise, and then the upward movement of the driving ring and the counterclockwise rotation of the top rotating ring restrain each other, so that the function of clamping and fixing the cable at multiple points and the function of sealing the channel restrain each other; S5: Release action: By lifting the top rotating ring, the axisymmetric one-way driving block is disengaged from the driving groove to release the self-locking effect on the driving ring. By rotating the top rotating ring counterclockwise, the axisymmetric sealing blades open the passage between the sealing wellhead and the cable to release the sealing effect on the passage. The hydraulic cylinder is pressurized and filled with oil by the hydraulic pump to drive the driving ring upward to release the multi-point clamping and fixing effect on the cable.

[0014] The present invention has the following beneficial effects: 1. The present invention pressurizes and fills the hydraulic cylinder with oil to drive the driving ring to move downward, so that the axisymmetric and evenly distributed clamping rollers can clamp the cable at multiple points. The cable is released to drive the clamping rollers to rotate through its own weight and the weight of the logging instrument, so that the axisymmetric and evenly distributed fixed jackets can rotate upward and squeeze the cable. The more the cable moves downward, the greater the squeezing force between the fixed jacket and the cable. In this way, the clamping rollers and the fixed jackets can cooperate to fix the cable at multiple points through the weight of the cable and the weight of the logging instrument, so as to avoid stress concentration at a single fixed point and affect the service life of the cable.

[0015] 2. In this embodiment of the present invention, the axisymmetric sealing blades can seal the channel between the wellhead and the cable by rotating the top rotating ring clockwise to prevent dirt outside the well from entering the well through the channel and affecting the operation of the logging instrument. The upward movement of the drive ring and the counterclockwise rotation of the top rotating ring restrict each other, so that the multi-point clamping and fixing effect of the cable and the sealing effect of the channel are mutually restricted, thereby ensuring the multi-point clamping and fixing effect of the fixing mechanism on the cable and the sealing effect of the sealing mechanism on the channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall planar structure of a wellhead cable protective fixing device proposed by the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure of a wellhead cable protective fixing device proposed by the present invention; Figure 3 It is a schematic cross-sectional structure diagram of Embodiment 1 of the present invention; Figure 4 for Figure 3 A schematic diagram of the structure enlargement at point A; Figure 5 is a first state diagram of the fixing mechanism in the first embodiment; Figure 6 is a second state diagram of the fixing mechanism in the first embodiment; Figure 7 It is a partial elevation structure schematic diagram of the second embodiment of the present invention; Figure 8 It is a partial cross-sectional structural schematic diagram of Embodiment 2 of the present invention; Fig. 9 for Figure 8 A schematic diagram of the structure at B in FIG. Fig.10 is a first state diagram of the sealing mechanism in the second embodiment; Fig.11 for Fig.10 A first cross-sectional structural schematic diagram of; Fig.12 for Fig.10 A second cross-sectional structural schematic diagram of ; Fig.13 for Fig.12 A schematic diagram of the structure at position C in FIG. Fig.14 is a second state diagram of the sealing mechanism in the second embodiment; Fig.15 The present invention provides a flow chart of a method for using a wellhead cable protective fixing device.

[0017] In the figure: 1, wellhead; 2, wellhead mounting sleeve; 21, inner mounting ring; 22, outer mounting ring; 23, top connecting ring; 24, mounting hole; 25, outer fixing ring; 26, top fixing ring; 3, connecting frame; 31, connecting ring; 32, connecting rib; 4, cable; 5, fixing mechanism; 51, rectangular sleeve; 52, abutment plate; 53, connecting arm A; 54, clamping roller; 55, connecting arm B; 56, fixing sleeve; 57, abutment block; 58, connecting plate; 59, lower opening; 60 , middle opening; 6, driving ring; 7, channel; 8, sealing mechanism; 81, sealing blade; 82, top rotating circle; 83, arc-shaped limit guide rail; 84, execution drive slide groove; 85, slider; 86, limit shaft pin; 87, center hole; 88, outer rotating ring; 89, vertical groove; 90, inclined groove; 91, linkage rod; 92, inner connecting ring; 93, driving groove; 94, accommodating groove; 95, one-way driving block; 96, reset spring; 97, L-shaped limit plate; 9, hydraulic cylinder. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0019] like Figure 1-Figure 6 As shown, a wellhead cable protective fixing device proposed by the present invention comprises a wellhead mounting sleeve 2 installed on the outside of the wellhead 1 and a connecting frame 3 located inside the wellhead 1, the wellhead mounting sleeve 2 comprises an inner mounting ring 21 sleeved on the inner side of the wellhead 1 and an outer mounting ring 22 sleeved on the outer side of the wellhead 1, a top connecting ring 23 is fixedly connected between the inner mounting ring 21 and the outer mounting ring 22, mounting holes 24 are evenly opened on the outer sides of the inner mounting ring 21 and the outer mounting ring 22, the inner mounting ring 21 and the outer mounting ring 22 can be installed on the inner side of the wellhead 1 and the outer mounting ring 22 can be installed on the outer side of the wellhead 1 by using expansion bolts and mounting holes 24, so as to complete the installation of the wellhead mounting sleeve 2, the connecting frame 3 comprises connecting rings 31 evenly distributed inside the wellhead 1, connecting ribs 32 are fixedly connected between the evenly distributed connecting rings 31, the connecting ribs 32 located at the top are fixedly connected to the bottom of the inner mounting ring 21, and the connecting frame 3 can be fixed inside the wellhead 1 by the wellhead mounting sleeve 2 installed on the top of the wellhead 1; The top of the top connecting ring 23 is fixedly connected with an outer fixing ring 25, and the top of the outer fixing ring 25 is fixedly connected with a top fixing ring 26. A hydraulic cylinder 9 is axially symmetrically installed at the bottom of the top fixing ring 26. The hydraulic cylinder 9 adopts the existing technology. The specific structure and connection method of the hydraulic cylinder 9 are not described in detail in this embodiment. The output ends of the axially symmetrically distributed hydraulic cylinders 9 are fixedly connected to the top of the driving ring 6. The hydraulic cylinder 9 can be pressurized and filled with oil by a hydraulic pump to drive the driving ring 6 to move up and down. A fixing mechanism 5 for fixing the cable 4 is symmetrically arranged on the inner side of the connecting frame 3, and the fixing mechanism 5 comprises a rectangular sleeve 51 uniformly embedded in the connecting frame 3 and an abutment plate 52 slidably connected to the inside of the rectangular sleeve 51, and a lower opening 59 for allowing the abutment block 57 to deflect is provided on the outside of the rectangular sleeve 51, and a connecting arm A53 is rotatably connected to the outside of the rectangular sleeve 51, and a clamping roller 54 is rotatably connected to the end of the connecting arm A53, and an abutment block 57 located at the bottom of the abutment plate 52 is symmetrically fixedly connected to the outside of the connecting arm A53, and a connecting plate 58 is fixedly connected between the uniformly distributed abutment plates 52, and the connecting plate 58 passes through between the symmetrical abutment plates 52, and the abutment plate 52 located at the top passes through the top connecting ring 23, and a driving ring 6 is fixedly connected between the abutment plates 52 located at the top, and the driving ring 6 can drive the abutment plates 52 with asymmetric axis to move downward, so as to drive the clamping roller 54 to deflect and clamp the cable 4 through the abutment block 57; The outside of the connecting arm A53 is provided with a central opening 60 for allowing the connecting arm B55 and the fixed sleeve 56 to pass through. The outside of the clamping roller 54 is fixedly connected to the connecting arm B55, and the end of the connecting arm B55 is rotatably connected to the fixed sleeve 56. A soft pad is provided on the inner side of the fixed sleeve 56. After the axisymmetric clamping roller 54 deflects and clamps the cable 4, the cable 4 is released, and the weight of the axisymmetric clamping roller 54 and the logging instrument can drive the axisymmetric clamping roller 54 to rotate inward, thereby allowing the axisymmetric connecting arm B55 to drive the fixed sleeve 56 to rotate upward to fix the position of the cable 4.

[0020] The working principle of this embodiment is as follows: after the connecting frame 3 is hoisted to enter the inside of the wellhead 1 by a hoisting machine and the wellhead mounting sleeve 2 is hoisted to be sleeved on the top of the wellhead 1, the inner mounting ring 21 is installed on the inner side of the wellhead 1 and the outer mounting ring 22 is installed on the outer side of the wellhead 1 by using expansion bolts and mounting holes 24, so that the installation of the wellhead mounting sleeve 2 can be completed, and the wellhead mounting sleeve 2 installed on the top of the wellhead 1, the connecting frame 3 located inside the wellhead 1 and the fixing mechanism 5 located on the connecting frame 3 do not affect the relevant use of the wellhead 1; Then, the hydraulic cylinder 9 is pressurized and filled with oil through the hydraulic pump to drive the driving ring 6 to move downward. The driving ring 6 moving downward will drive the axisymmetric abutment plate 52 to squeeze the abutment block 57 at its bottom downward, so that the axisymmetric and evenly distributed connecting arm A53 drives the clamping roller 54 to rotate inward and clamp the cable 4. At this time, the axisymmetric and evenly distributed clamping roller 54 can form a multi-point clamping on the cable 4. Then, the cable 4 is released so that it drives the axisymmetric and evenly distributed clamping roller 54 to rotate inward through its own weight and the weight of the logging instrument, so that the axisymmetric and evenly distributed connecting arm B55 drives the fixed jacket 56 to rotate upward and squeeze the cable 4. The more the cable 4 moves downward, the greater the squeezing force between the fixed jacket 56 and the cable 4. In this way, the axisymmetric and evenly distributed clamping roller 54 and the fixed jacket 56 can cooperate to form a clamping and fixing effect through the dead weight of the cable 4 and the weight of the logging instrument. The hydraulic cylinder 9 is pressurized and filled with oil by a hydraulic pump to drive the driving ring 6 to move upward, thereby releasing the multi-point clamping and fixing effect of the axisymmetric and evenly distributed clamping rollers 54 and the fixing sleeve 56 on the cable 4.

[0021] The main difference between this embodiment and the prior art is that: in this embodiment, by pressurizing and filling the hydraulic cylinder 9 with oil to drive the drive ring 6 to move downward, the axisymmetric and evenly distributed clamping rollers 54 can clamp the cable 4 at multiple points, and by releasing the cable 4, the clamping rollers 54 can be driven to rotate by the weight of the cable 4 and the well logging instrument, so that the axisymmetric and evenly distributed fixed jacket 56 can be rotated upward and squeeze the cable 4, and the further the cable 4 moves downward, the greater the squeezing force between the fixed jacket 56 and the cable 4. In this way, the clamping rollers 54 and the fixed jacket 56 can cooperate to fix the cable 4 at multiple points through the dead weight of the cable 4 and the weight of the well logging instrument, so as to avoid stress concentration at a single fixed point and affect the service life of the cable 4. Embodiment 2

[0022] like Figure 1-Figure 2 and Figure 7-Figure 14 As shown, based on the first embodiment, a sealing mechanism 8 for sealing the channel 7 between the wellhead 1 and the cable 4 is provided on the top of the wellhead installation sleeve 2. The sealing mechanism 8 includes axially symmetrically distributed sealing blades 81, and a soft gasket is provided on the outer side of the sealing blades 81; The sealing mechanism 8 also includes a top rotating ring 82 movably connected above the top fixing ring 26 and an arc-shaped limiting guide rail 83 axially symmetrically embedded on the top of the top fixing ring 26. An execution driving slide groove 84 is axially symmetrically provided at the bottom of the top rotating ring 82. A slider 85 fixedly connected to the top of the sealing blade 81 is slidably connected inside the execution driving slide groove 84. A limiting shaft pin 86 fixedly connected to the bottom of the sealing blade 81 is movably connected inside the arc-shaped limiting guide rail 83. The top rotating ring 82 can rotate the axially symmetrical sealing blade 81 to form a circular central hole 87. The top fixing ring 26, the arc-shaped limiting guide rail 83, the limiting shaft pin 86, the sealing blade 81, the slider 85, the execution driving slide groove 84 and the top rotating ring 82 together constitute a sealing mechanism similar to an iris mechanism. The central hole 87 formed by the rotation of the axially symmetrical sealing blade 81 can be changed by rotating the top rotating ring 82. The sealing mechanism 8 also includes an outer rotating ring 88 rotatably connected to the outside of the top fixed ring 26 and a vertical groove 89 axially symmetrically opened on the outside of the outer fixed ring 25. The outer rotating ring 88 is axially symmetrically opened with an inclined groove 90. The inside of the inclined groove 90 is slidably connected with a linkage rod 91 that passes through the vertical groove 89 and is fixedly connected to the outside of the driving ring 6. When the driving ring 6 drives the linkage rod 91 to move downward, the outer rotating ring 88 can be driven to rotate counterclockwise through the inclined groove 90, and vice versa. The outer rotating ring 88 is driven to rotate clockwise. The bottom of the top rotating ring 82 is fixedly connected to an inner connecting ring 92 located inside the outer rotating ring 88. The inner side of the outer rotating ring 88 is axially symmetrically provided with a driving groove 93 extending to the top thereof, and the outer side of the inner connecting ring 92 is axially symmetrically provided with a receiving groove 94, and the inside of the receiving groove 94 is slidably connected with a one-way driving block 95 located inside the driving groove 93, and a return spring 96 is fixedly connected between the one-way driving block 95 and the receiving groove 94. The outer rotating ring 88 and the inner connecting ring 92 can be synchronously rotated clockwise through the axially symmetrical one-way driving block 95, so as to prevent the upward movement of the driving ring 6 from weakening the clamping and fixing cable 4, and the counterclockwise rotation of the top rotating ring 82 from weakening the sealing channel 7; An L-shaped limit plate 97 for preventing the top rotating ring 82 from detaching is symmetrically fixedly connected to the outer axis of the outer rotating ring 88. A block may be added between the top rotating ring 82 and the L-shaped limit plate 97, or a wellhead blowout preventer may be installed on the inner side of the inner mounting ring 21, so as to prevent the top rotating ring 82 from moving upward due to the impact of the fluid inside the wellhead 1 (such as crude oil, natural gas or water, etc.) and losing the self-locking effect on the drive ring 6 and the sealing effect on the channel 7.

[0023] The working principle of this embodiment is as follows: when the drive ring 6 moves downward so that the axisymmetric and evenly distributed clamping rollers 54 form a multi-point clamping on the cable 4, the linkage rod 91 will follow the drive ring 6 to move downward and drive the outer rotating ring 88 to rotate counterclockwise through the inclined groove 90, and the inner connecting ring 92 is not affected by the counterclockwise rotation of the outer rotating ring 88; The top rotating ring 82 is rotated clockwise to drive the inner connecting ring 92 and the execution driving slide groove 84 to rotate clockwise. During this process, the slider 85 and the limit pin 86 fixedly connected to the sealing blade 81 will slide inside the execution driving slide groove 84 and the arc-shaped limit guide rail 83 respectively, so that the central hole 87 formed by the rotation of the axially symmetrical sealing blade 81 becomes smaller and smaller, and the outer rotating ring 88 is not affected by the clockwise rotation of the inner connecting ring 92, until the axially symmetrical sealing blade 81 completely seals the channel 7 between the wellhead 1 and the cable 4. If there is a small gap between the cable 4 and the sealing blade 81, it can be re-sealed with a sealant; Thereafter, if the hydraulic cylinder 9 releases pressure, causing the clamping roller 54 and the fixed jacket 56 to loosen and the abutment plate 52 to drive the drive ring 6 to move upward, the linkage rod 91 will follow the drive ring 6 to move upward and drive the outer rotating ring 88 to rotate clockwise through the inclined groove 90, and the clockwise rotating outer rotating ring 88 will drive the inner connecting ring 92 and the top rotating ring 82 to rotate clockwise synchronously through the axially symmetrical driving block 95. At this time, the axially symmetrical sealing blades 81 have completely sealed the channel 7 between the wellhead 1 and the cable 4 and cannot continue to be retracted, that is, the top rotating ring 82 cannot rotate clockwise, so that the drive ring 6 cannot move upward, thereby avoiding the loosening of the clamping roller 54 and the fixed jacket 56; Thereafter, if the axially symmetrical sealing blade 81 is loosened so that the top rotating ring 82 drives the inner connecting ring 92 to rotate counterclockwise, the inner connecting ring 92 rotating clockwise will drive the outer rotating ring 88 to rotate counterclockwise synchronously through the axially symmetrical driving block 95, and the outer rotating ring 88 rotating counterclockwise will drive the linkage rod 91 to move downward through the inclined groove 90, and the downward movement of the linkage rod 91 will drive the abutment plate 52 to continue to press the abutment block 57 at its bottom downward through the driving ring 6 to make the axially symmetrical clamping roller 54 rotate inwardly, and at this time, the axially symmetrical clamping roller 54 has completely clamped the cable 4 and cannot continue to rotate inwardly, that is, the driving ring 6 cannot move downward, so that the top rotating ring 82 cannot rotate counterclockwise, thereby avoiding the loosening of the sealing blade 81; Finally, by lifting the rotating circle 82 to drive the inner connecting ring 92 to move upward and disengage the axially symmetrical one-way driving block 95 from the driving groove 93, the self-locking effect on the driving ring 6, the sealing effect on the channel 7 and the multi-point clamping and fixing effect on the cable 4 can be released in turn.

[0024] The main difference between this embodiment and the prior art is that in this embodiment, the axisymmetric sealing blade 81 can seal the channel 7 between the wellhead 1 and the cable 4 by rotating the top rotating circle 82 clockwise to prevent dirt outside the well from entering the well through the channel 7 and affecting the operation of the logging instrument, and the upward movement of the drive ring 6 and the counterclockwise rotation of the top rotating circle 82 constrain each other, so that the multi-point clamping and fixing effect of the cable 4 and the sealing effect of the channel 7 are mutually constrained, thereby ensuring the multi-point clamping and fixing effect of the fixing mechanism 5 on the cable 4 and the sealing effect of the sealing mechanism 8 on the channel 7. Embodiment 3

[0025] like Fig.15 As shown, based on the first and second embodiments, a method for using a wellhead cable protective fixing device proposed by the present invention comprises the following steps: S1: Pre-installation: The connecting frame 3 is hoisted into the wellhead 1 by a hoisting machine, and the wellhead installation sleeve 2 is hoisted to be installed on the top of the wellhead 1, and then the wellhead installation sleeve 2 is fastened and installed on the top of the wellhead 1 by using expansion bolts; S2: Cable clamping: The hydraulic cylinder 9 is pressurized and filled with oil by a hydraulic pump to drive the driving ring 6 to move downward, so that the connecting arm A53 drives the clamping roller 54 to rotate inward to clamp the cable 4, thereby achieving multi-point clamping of the cable 4; S3: Cable fixing: The cable 4 is released so that the cable 4 drives the axisymmetric clamping roller 54 to rotate inward due to its own weight and the logging instrument, so that the connecting arm B55 drives the fixing jacket 56 to rotate upward to fix the cable 4, thereby realizing multi-point fixing of the cable; S4: Channel sealing: The top rotating ring 82 is rotated clockwise to make the axially symmetrical sealing blades 81 rotate and seal the channel 7 between the wellhead 1 and the cable 4. After that, the upward movement of the driving ring 6 and the counterclockwise rotation of the top rotating ring 82 are mutually restricted, so that the function of clamping and fixing the cable 4 at multiple points and the function of sealing the channel 7 are mutually restricted; S5: Release action: By lifting the top rotating circle 82, the axially symmetrical one-way driving block 95 is disengaged from the driving groove 93 to release the self-locking effect on the drive ring 6. By rotating the top rotating circle 82 counterclockwise, the axially symmetrical sealing blades 81 open the channel 7 between the sealed wellhead 1 and the cable 4 to release the sealing effect on the channel 7. The hydraulic cylinder 9 is pressurized and filled with oil by the hydraulic pump to drive the drive ring 6 to move upward to release the multi-point clamping and fixing effect on the cable 4.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wellhead cable protective fixing device, comprising a wellhead mounting sleeve (2) mounted outside a wellhead (1) and a connecting frame (3) located inside the wellhead (1), characterized in that: A fixing mechanism (5) for fixing the cable (4) is symmetrically arranged on the inner side of the connecting frame (3), the fixing mechanism (5) comprising a rectangular sleeve (51) uniformly embedded in the interior of the connecting frame (3) and an abutment plate (52) slidably connected to the interior of the rectangular sleeve (51), a connecting arm A (53) is rotatably connected to the exterior of the rectangular sleeve (51), a clamping roller (54) is rotatably connected to the end of the connecting arm A (53), a connecting arm B (55) is fixedly connected to the exterior of the clamping roller (54), a fixing sleeve (56) is rotatably connected to the end of the connecting arm B (55), an abutment block (57) located at the bottom of the abutment plate (52) is symmetrically fixedly connected to the exterior of the connecting arm A (53), connecting plates (58) are fixedly connected between the uniformly distributed abutment plates (52), and a driving ring (6) is fixedly connected between the abutment plates (52) located at the top; A sealing mechanism (8) for sealing the channel (7) between the wellhead (1) and the cable (4) is arranged at the top of the wellhead installation sleeve (2); the sealing mechanism (8) comprises sealing blades (81) that are axially symmetrically distributed.

2. A wellhead cable protective fixing device according to claim 1, characterized in that: The wellhead mounting sleeve (2) comprises an inner mounting ring (21) sleeved on the inner side of the wellhead (1) and an outer mounting ring (22) sleeved on the outer side of the wellhead (1); a top connecting ring (23) is fixedly connected between the inner mounting ring (21) and the outer mounting ring (22); mounting holes (24) are evenly formed on the outside of the inner mounting ring (21) and the outer mounting ring (22); an outer fixing ring (25) is fixedly connected to the top of the top connecting ring (23); and a top fixing ring (26) is fixedly connected to the top of the outer fixing ring (25).

3. A wellhead cable protective fixing device according to claim 2, characterized in that: The connecting frame (3) comprises connecting rings (31) evenly distributed inside the wellhead (1), connecting ribs (32) being fixedly connected between the evenly distributed connecting rings (31), and the connecting rib (32) located at the top is fixedly connected to the bottom of the inner mounting ring (21).

4. A wellhead cable protective fixing device according to claim 3, characterized in that: The rectangular sleeve (51) is provided with a lower opening (59) on the outside for allowing the abutment block (57) to deflect, the connecting arm A (53) is provided with a middle opening (60) on the outside for allowing the connecting arm B (55) and the fixing sleeve (56) to pass through, and the connecting plate (58) passes between the symmetrical abutment plates (52).

5. A wellhead cable protective fixing device according to claim 4, characterized in that: The abutment plate (52) located at the top passes through the top connection ring (23), and a hydraulic cylinder (9) is axially symmetrically installed at the bottom of the top fixing ring (26), and the output ends of the axially symmetrically distributed hydraulic cylinders (9) are fixedly connected to the top of the drive ring (6).

6. A wellhead cable protective fixing device according to claim 5, characterized in that: The sealing mechanism (8) further comprises a top rotating ring (82) movably connected to the top of the top fixing ring (26) and an arc-shaped limiting guide rail (83) axially symmetrically embedded in the top of the top fixing ring (26); an execution driving slide groove (84) is axially symmetrically opened at the bottom of the top rotating ring (82); a slider (85) fixedly connected to the top of the sealing blade (81) is slidably connected inside the execution driving slide groove (84); a limiting shaft pin (86) fixedly connected to the bottom of the sealing blade (81) is movably connected inside the arc-shaped limiting guide rail (83); the top rotating ring (82) can rotate to rotate the axially symmetrical sealing blade (81) to form a circular center hole (87).

7. A wellhead cable protective fixing device according to claim 6, characterized in that: The sealing mechanism (8) further comprises an outer rotating ring (88) rotatably connected to the outside of the top fixing ring (26) and a vertical groove (89) axially symmetrically provided on the outside of the outer fixing ring (25); an inclined groove (90) is axially symmetrically provided on the outside of the outer rotating ring (88); a linkage rod (91) is slidably connected inside the inclined groove (90) and passes through the vertical groove (89) and is fixedly connected to the outside of the driving ring (6); The bottom of the top rotating ring (82) is fixedly connected to an inner connecting ring (92) located inside the outer rotating ring (88); the inner side of the outer rotating ring (88) is axially symmetrically provided with a driving groove (93) extending to the top thereof; the outer side of the inner connecting ring (92) is axially symmetrically provided with a receiving groove (94); the interior of the receiving groove (94) is slidably connected to a one-way driving block (95) located inside the driving groove (93); a return spring (96) is fixedly connected between the one-way driving block (95) and the receiving groove (94); An L-shaped limiting plate (97) for preventing the top rotating ring (82) from detaching is symmetrically fixedly connected to the outer axis of the outer rotating ring (88).

8. A method for using a wellhead cable protective fixing device according to claim 7, characterized in that: The following steps are involved: S1: Pre-installation: The connecting frame (3) is hoisted into the wellhead (1) by a hoisting machine, and the wellhead installation sleeve (2) is hoisted to be installed on the top of the wellhead (1), and then the wellhead installation sleeve (2) is fastened and installed on the top of the wellhead (1) by using expansion bolts; S2: Cable clamping: The hydraulic cylinder (9) is pressurized and filled with oil by a hydraulic pump so as to drive the driving ring (6) to move downward, so that the connecting arm A (53) drives the clamping roller (54) to rotate inward to clamp the cable (4), thereby achieving multi-point clamping of the cable (4); S3: Cable fixing: The cable (4) is released so that the cable (4) drives the axisymmetric clamping roller (54) to rotate inward due to its own weight and the logging instrument, so that the connecting arm B (55) drives the fixing jacket (56) to rotate upward to fix the cable (4), thereby achieving multi-point fixing of the cable (4); S4: Channel sealing: The top rotating ring (82) is rotated clockwise to cause the axially symmetrical sealing blades (81) to rotate and seal the channel (7) between the wellhead (1) and the cable (4). Thereafter, the upward movement of the drive ring (6) and the counterclockwise rotation of the top rotating ring (82) are mutually restrained, so that the function of clamping and fixing the cable (4) at multiple points and the function of sealing the channel (7) are mutually restrained; S5: Release action: By lifting the top rotating ring (82), the axisymmetric one-way driving block (95) is disengaged from the driving groove (93) to release the self-locking effect on the driving ring (6); by rotating the top rotating ring (82) counterclockwise, the axisymmetric sealing blade (81) opens the channel (7) between the sealing wellhead (1) and the cable (4) to release the sealing effect on the channel (7); and by pressurizing and filling the hydraulic cylinder (9) with oil through the hydraulic pump, it drives the driving ring (6) to move upward to release the multi-point clamping and fixing effect on the cable (4).

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