A protective fixing device for wellhead cables and its usage method

Abstract

The present invention relates to the technical field of wellhead cable fixing, and discloses a wellhead cable protective fixing device and its using method, which includes a wellhead installation sleeve and a connecting frame. Fixing mechanisms are symmetrically arranged inside the connecting frame. The fixing mechanism includes uniformly arranged rectangular sleeves and abutting plates. A connecting arm A is rotatably connected to the outside of the rectangular sleeve. The end of the connecting arm A is rotatably connected to a clamping roller. A connecting arm B is fixedly connected to the outside of the clamping roller. The end of the connecting arm B is rotatably connected to a fixed clamping sleeve. A sealing mechanism is arranged at the top of the wellhead installation sleeve. The sealing mechanism includes axially symmetric sealing blades. According to the present invention, the self-weight of the cable and the weight of the logging instrument can enable the clamping roller and the fixed clamping sleeve to cooperate to fix the cable at multiple points. By clockwise rotating the top rotating ring, the axially symmetric sealing blades can seal the channel, and the function of clamping and fixing the cable at multiple points and the function of sealing the channel restrict each other.

Description

Technical Field

[0001] The present 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 object of the present invention is to solve the drawbacks in the prior art that stress concentration is likely to occur at a single fixed point, affecting the service life of the cable, and the passage between the wellhead and the cable is not sealed, making it difficult to avoid the entry of dirt, and to propose a protective fixing device for wellhead cables and its usage method.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A protective fixing device for wellhead cables includes a wellhead mounting sleeve installed outside the wellhead and a connecting frame located inside the wellhead. On the inner side of the connecting frame, a fixing mechanism for fixing the cable is symmetrically arranged. The fixing mechanism includes a rectangular sleeve evenly embedded in the connecting frame and a contact plate slidably connected inside 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 fixed clamping sleeve is rotatably connected to the end of the connecting arm B. On the outside of the connecting arm A, contact blocks located at the bottom of the contact plate are symmetrically fixedly connected. A connecting plate is fixedly connected between the evenly distributed contact plates, and a driving ring is fixedly connected between the topmost contact plates.

[0008] On the top of the wellhead mounting sleeve, a sealing mechanism for sealing the passage between the wellhead and the cable is provided. The sealing mechanism includes symmetrically distributed sealing blades.

[0009] The above technical solution further includes:

[0010] The wellhead mounting sleeve includes an inner mounting ring sleeved on the inner side of the wellhead and an outer mounting ring sleeved on the outside 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 outside of the inner mounting ring and the outer mounting ring. An outer fixing ring is fixedly connected to the top of the top connecting ring, and a top fixing ring is fixedly connected to the top of the outer fixing ring. By using expansion bolts and the mounting holes, the inner mounting ring can be installed on the inner side of the wellhead and the outer mounting ring can be installed on the outside of the wellhead 1, thus completing the installation of the wellhead mounting sleeve.

[0011] The connecting frame includes connecting rings evenly distributed inside the wellhead. Connecting ribs are fixedly connected between the evenly distributed connecting rings. The topmost connecting rib is fixedly connected to the bottom of the inner mounting ring. The connecting frame can be fixed inside the wellhead through the wellhead mounting sleeve installed on the top of the wellhead.

[0012] On the outside of the rectangular sleeve, a lower opening for allowing the deflection of the contact block is provided. On the outside of the connecting arm A, a middle opening for allowing the connecting arm B and the fixed clamping sleeve to pass through is provided. The connecting plate passes through between the symmetric contact plates.

[0013] The top contact plate passes through the top connection ring. Hydraulic cylinders are 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 oil into the hydraulic cylinders, the driving ring can drive the axially symmetric contact plates to move downward, so as to drive the clamping rollers to deflect and clamp the cable through the contact blocks, thereby promoting the subsequent fixing effect of the fixing sleeve on the cable.

[0014] The sealing mechanism further 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. An actuating drive chute is axially symmetrically opened at the bottom of the top rotating ring, and a slider fixedly connected to the top of the sealing blade is slidably connected inside the actuating drive chute. A limiting pin fixedly connected to the bottom of the sealing blade is movably connected inside the arc-shaped limiting guide rail. When the top rotating ring rotates, the axially symmetric sealing blades can rotate to form a circular central hole. By rotating the top rotating ring, the central hole formed by the rotation of the axially symmetric sealing blades can be changed.

[0015] The sealing mechanism further includes an outer rotating ring rotatably connected to the outside of the top fixing ring and a vertical groove axially symmetrically opened on the outside of the outer fixing ring. An inclined groove is axially symmetrically opened on the outside of the outer rotating ring, and a linkage rod passing through the vertical groove and fixedly connected to the outside of the driving ring is slidably connected inside the inclined groove. When the driving ring drives the linkage rod to move downward, the outer rotating ring can be driven to rotate counterclockwise through the inclined groove, and vice versa to drive the outer rotating ring to rotate clockwise.

[0016] A inner connection ring located inside the outer rotating ring is fixedly connected to the bottom of the top rotating ring. A driving groove extending to its top is axially symmetrically opened on the inner side of the outer rotating ring. An accommodating groove is axially symmetrically opened on the outside of the inner connection ring, and a one-way driving block located inside the driving groove is slidably connected inside the accommodating groove. A return spring is fixedly connected between the one-way driving block and the accommodating groove. The outer rotating ring and the inner connection ring can rotate clockwise synchronously through the axially symmetric one-way driving blocks, so as to prevent the effect of clamping and fixing the cable from being weakened due to the upward movement of the driving ring and the effect of the sealing channel from being weakened due to the counterclockwise rotation of the top rotating ring.

[0017] An L-shaped limiting plate for preventing the top rotating ring from detaching is axially symmetrically fixedly connected to the outside of the outer rotating ring. A blocking block can be added between the top rotating ring and the L-shaped limiting plate or a blowout preventer can be installed inside the inner installation ring to prevent the top rotating ring from losing the sealing effect on the channel due to the impact of the fluid inside the wellhead.

[0018] Based on the above usage method of a wellhead cable protective fixing device, it includes the following usage steps:

[0019] S1: Preset installation: Use a hoisting machine to lift the connecting frame into the interior of the wellhead and lift the wellhead installation sleeve to the top of the wellhead, and then use expansion bolts to firmly install the wellhead installation sleeve on the top of the wellhead;

[0020] S2: Cable clamping: Pressurize and fill the hydraulic cylinder through a 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 realizing multi-point clamping of the cable;

[0021] S3: Cable fixing: Release the cable so that the cable drives the axially symmetric clamping roller to rotate inward due to its own weight and the weight of the logging instrument, so that the connecting arm B drives the fixing clamp sleeve to rotate upward to fix the cable, thereby realizing multi-point fixing of the cable;

[0022] S4: Channel sealing: Rotate the top rotating ring clockwise to make the axially symmetric sealing blades rotate to seal the channel between the wellhead and the cable. Thereafter, the upward movement of the driving ring and the counterclockwise rotation of the top rotating ring restrict each other, so that the function of multi-point clamping and fixing the cable and the function of sealing the channel restrict each other;

[0023] S5: Release the function: Lift the top rotating ring to make the axially symmetric one-way driving block disengage from the driving groove to release the self-locking function of the driving ring. Rotate the top rotating ring counterclockwise to open the axially symmetric sealing blades to seal the channel between the wellhead and the cable to release the sealing function of the channel. Pressurize and fill the hydraulic cylinder through a hydraulic pump to drive the driving ring to move upward to release the multi-point clamping and fixing function of the cable.

[0024] The present invention has the following beneficial effects:

[0025] 1. In the present invention, by pressurizing and filling the hydraulic cylinder to drive the driving ring to move downward, the axially symmetric and evenly distributed clamping rollers can perform multi-point clamping on the cable. By releasing the cable and allowing it to drive the clamping rollers to rotate through its own weight and the weight of the logging instrument, the axially symmetric and evenly distributed fixing clamp sleeves can rotate upward and squeeze the cable. Moreover, the lower the cable moves, the greater the squeezing force between the fixing clamp sleeve and the cable. In this way, the clamping rollers and the fixing clamp sleeves can cooperate to perform multi-point fixing on the cable through the self-weight of the cable and the weight of the logging instrument, so as to avoid stress concentration at a single fixing point and affect the service life of the cable.

[0026] 2. In this embodiment of the present invention, by rotating the top rotating ring clockwise, the axially symmetric sealing blades can seal the channel between the wellhead and the cable, preventing external contaminants from entering the well through the channel and affecting the operation of the logging instrument. Moreover, the upward movement of the driving ring and the counterclockwise rotation of the top rotating ring restrict each other, so that the function of multi-point clamping and fixing the cable and the function of sealing the channel restrict each other, thereby ensuring the multi-point clamping and fixing function of the fixing mechanism on the cable and the sealing function of the sealing mechanism on the channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. is a schematic overall planar structure diagram of a wellhead cable protective fixing device proposed by the present invention;

[0028] Figure 2 FIG. is a schematic overall three-dimensional structure diagram of a wellhead cable protective fixing device proposed by the present invention;

[0029] Figure 3 FIG. is a schematic cross-sectional structure diagram of Embodiment 1 of the present invention;

[0030] Figure 4 is Figure 3 an enlarged schematic view of the structure at A in;

[0031] Figure 5 FIG. is a first state diagram of the fixing mechanism in Embodiment 1;

[0032] Figure 6 FIG. is a second state diagram of the fixing mechanism in Embodiment 1;

[0033] Figure 7 FIG. is a partial elevation structure diagram of Embodiment 2 of the present invention;

[0034] Figure 8 FIG. is a partial cross-sectional structure diagram of Embodiment 2 of the present invention;

[0035] Figure 9 is Figure 8 an enlarged schematic view of the structure at B in;

[0036] Figure 10 FIG. is a first state diagram of the sealing mechanism in Embodiment 2;

[0037] Figure 11 is Figure 10 the first cross-sectional structure diagram of;

[0038] Figure 12 is Figure 10 the second cross-sectional structure diagram of;

[0039] Figure 13 is Figure 12 an enlarged schematic view of the structure at C in;

[0040] Figure 14 It is the second state diagram of the sealing mechanism in Embodiment 2;

[0041] Figure 15 It is a flowchart of the usage method of a wellhead cable protective fixing device proposed by the present invention.

[0042] In the figure: 1. Wellhead; 2. Wellhead installation sleeve; 21. Inner installation ring; 22. Outer installation ring; 23. Top connection ring; 24. Installation hole; 25. Outer fixing ring; 26. Top fixing ring; 3. Connecting frame; 31. Connection ring; 32. Connection rib; 4. Cable; 5. Fixing mechanism; 51. Rectangular sleeve; 52. Contact plate; 53. Connecting arm A; 54. Clamping roller; 55. Connecting arm B; 56. Fixed clamping sleeve; 57. Contact block; 58. Connecting plate; 59. Lower opening; 60. Middle opening; 6. Driving ring; 7. Channel; 8. Sealing mechanism; 81. Sealing blade; 82. Top rotating ring; 83. Arc-shaped limiting guide rail; 84. Execution driving chute; 85. Slide block; 86. Limiting shaft pin; 87. Central hole; 88. Outer rotating ring; 89. Vertical groove; 90. Inclined groove; 91. Linking rod; 92. Inner connecting ring; 93. Driving groove; 94. Accommodating groove; 95. One-way driving block; 96. Return spring; 97. L-shaped limiting plate; 9. Hydraulic cylinder. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1

[0045] Such as Figures 1-6As shown in the figure, a protective fixing device for wellhead cables proposed by the present invention includes a wellhead installation sleeve 2 installed outside the wellhead 1 and a connecting frame 3 located inside the wellhead 1. The wellhead installation sleeve 2 includes an inner installation ring 21 sleeved on the inner side of the wellhead 1 and an outer installation ring 22 sleeved on the outer side of the wellhead 1. A top connecting ring 23 is fixedly connected between the inner installation ring 21 and the outer installation ring 22. Installation holes 24 are evenly opened on the outsides of the inner installation ring 21 and the outer installation ring 22. By using expansion bolts and the installation holes 24, the inner installation ring 21 can be installed on the inner side of the wellhead 1 and the outer installation ring 22 can be installed on the outer side of the wellhead 1, thus completing the installation of the wellhead installation sleeve 2. The connecting frame 3 includes connecting rings 31 evenly distributed inside the wellhead 1. Connecting ribs 32 are fixedly connected between the evenly distributed connecting rings 31. The connecting rib 32 at the uppermost part is fixedly connected to the bottom of the inner installation ring 21. The connecting frame 3 can be fixed inside the wellhead 1 through the wellhead installation sleeve 2 installed on the top of the wellhead 1;

[0046] A top fixing ring 26 is fixedly connected to the top of the top connecting ring 23. A hydraulic cylinder 9 is axially symmetrically installed at the bottom of the top fixing ring 26. The hydraulic cylinder 9 adopts the prior art. The specific structure and connection method of the hydraulic cylinder 9 are not specifically described in this embodiment. The output ends of the axially symmetrically distributed hydraulic cylinders 9 are all fixedly connected to the top of the driving ring 6. By pressurizing and filling oil in the hydraulic cylinder 9 through a hydraulic pump, it can drive the driving ring 6 to move up and down;

[0047] A fixing mechanism 5 for fixing the cable 4 is axially symmetrically arranged inside the connecting frame 3. The fixing mechanism 5 includes rectangular sleeves 51 evenly embedded inside the connecting frame 3 and abutting plates 52 slidably connected inside the rectangular sleeves 51. A lower opening 59 for allowing the abutting blocks 57 to deflect is opened on the outside of the rectangular sleeve 51. A connecting arm A53 is rotatably connected to the outside of the rectangular sleeve 51. A clamping roller 54 is rotatably connected to the end of the connecting arm A53. Abutting blocks 57 located at the bottom of the abutting plate 52 are symmetrically fixedly connected to the outside of the connecting arm A53. A connecting plate 58 is fixedly connected between the evenly distributed abutting plates 52. The connecting plate 58 passes through between the symmetric abutting blocks 57. The abutting plate 52 at the uppermost part passes through the top connecting ring 23. A driving ring 6 is fixedly connected between the abutting plates 52 at the uppermost part. The driving ring 6 can drive the axially symmetric abutting plates 52 to move downward, so as to drive the clamping roller 54 to deflect and clamp the cable 4 through the abutting blocks 57;

[0048] The outside of the connecting arm A53 is provided with a middle opening 60 for allowing the connecting arm B55 and the fixing clamp 56 to pass through. The outside of the clamping roller 54 is fixedly connected with the connecting arm B55. The end of the connecting arm B55 is rotatably connected with the fixing clamp 56. A soft cushion is arranged inside the fixing clamp 56. After the axially symmetric clamping rollers 54 deflect and clamp the cable 4, releasing the cable 4 can drive the axially symmetric clamping rollers 54 to rotate inward under their own weight and the weight of the logging tool, so that the axially symmetric connecting arm B55 drives the fixing clamp 56 to rotate upward to fix the position of the cable 4.

[0049] Working principle of this embodiment: After the connecting frame 3 is lifted by the hoisting machine into the inside of the wellhead 1 and the wellhead installation sleeve 2 is lifted and sleeved on the top of the wellhead 1, the inner installation ring 21 is installed inside the wellhead 1 and the outer installation ring 22 is installed outside the wellhead 1 by using expansion bolts and the installation holes 24, so that the installation of the wellhead installation sleeve 2 can be completed. The wellhead installation 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 related use of the wellhead 1.

[0050] Subsequently, the hydraulic pump pressurizes and fills the hydraulic cylinder 9 with oil to drive the driving ring 6 to move downward. The downward moving driving ring 6 will drive the axially symmetric abutting plate 52 to squeeze the abutting block 57 at its bottom, so that the axially symmetric and evenly distributed connecting arms A53 drive the clamping rollers 54 to rotate inward and clamp the cable 4. At this time, the axially symmetric and evenly distributed clamping rollers 54 can form multi-point clamping on the cable 4. Then release the cable 4 to drive the axially symmetric and evenly distributed clamping rollers 54 to rotate inward under its own weight and the weight of the logging tool, so that the axially symmetric and evenly distributed connecting arms B55 drive the fixing clamp 56 to rotate upward and squeeze the cable 4. The lower the cable 4 moves, the greater the squeezing force between the fixing clamp 56 and the cable 4. In this way, the axially symmetric and evenly distributed clamping rollers 54 and the fixing clamp 56 can cooperate to form a clamping and fixing effect through the self-weight of the cable 4 and the weight of the logging tool.

[0051] Pressurize and fill the hydraulic cylinder 9 with oil by the hydraulic pump to drive the driving ring 6 to move upward, and the multi-point clamping and fixing effect of the axially symmetric and evenly distributed clamping rollers 54 and the fixing clamp 56 on the cable 4 can be released.

[0052] The main difference between this embodiment and the prior art is that in this embodiment, the hydraulic cylinder 9 is pressurized and filled with oil to drive the driving ring 6 to move downward, so that the axially symmetric and uniformly distributed clamping rollers 54 can clamp the cable 4 at multiple points. By releasing the cable 4 and allowing it to drive the clamping rollers 54 to rotate through its own weight and the weight of the logging instrument, the axially symmetric and uniformly distributed fixed clamping sleeves 56 can rotate upward and squeeze the cable 4. Moreover, the lower the cable 4 moves, the greater the squeezing force between the fixed clamping sleeve 56 and the cable 4. In this way, the self-weight of the cable 4 and the weight of the logging instrument can be used to make the clamping rollers 54 and the fixed clamping sleeves 56 cooperate to fix the cable 4 at multiple points, so as to avoid stress concentration at a single fixed point and affect the service life of the cable 4.

[0053] Embodiment Two

[0054] As Figures 1-2 and Figures 7-14 shown, based on Embodiment One, a sealing mechanism 8 for sealing the channel 7 between the wellhead 1 and the cable 4 is provided at 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;

[0055] The sealing mechanism 8 further 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 in the top of the top fixing ring 26. An actuating drive chute 84 is axially symmetrically formed 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 actuating drive chute 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. Rotating the top rotating ring 82 can make the axially symmetric sealing blades 81 rotate 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 actuating drive chute 84 and the top rotating ring 82 together form a sealing mechanism similar to an iris mechanism. By rotating the top rotating ring 82, the central hole 87 formed by the rotation of the axially symmetric sealing blades 81 can be changed;

[0056] The sealing mechanism 8 further includes an outer rotating ring 88 rotatably connected to the outside of the top fixing ring 26 and a vertical groove 89 axially symmetrically opened on the outside of the outer fixing ring 25. An inclined groove 90 is axially symmetrically opened on the outside of the outer rotating ring 88. A linkage rod 91 passing through the vertical groove 89 and fixedly connected to the outside of the driving ring 6 is slidably connected inside the inclined groove 90. 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 to drive the outer rotating ring 88 to rotate clockwise. A bottom of the top rotating ring 82 is fixedly connected with an inner connecting ring 92 located inside the outer rotating ring 88. An inner side of the outer rotating ring 88 is axially symmetrically provided with a driving groove 93 extending to its top. An outer side of the inner connecting ring 92 is axially symmetrically provided with a receiving groove 94. A one-way driving block 95 located inside the driving groove 93 is slidably connected inside the receiving groove 94. 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 rotate clockwise synchronously through the axially symmetric one-way driving blocks 95, so as to prevent the upward movement of the driving ring 6 from weakening the effect of clamping and fixing the cable 4 and prevent the counterclockwise rotation of the top rotating ring 82 from weakening the effect of the sealing channel 7.

[0057] An L-shaped limiting plate 97 for preventing the top rotating ring 82 from detaching is axially symmetrically and fixedly connected to the outside of the outer rotating ring 88. A blocking block can be added between the top rotating ring 82 and the L-shaped limiting plate 97 or a blowout preventer can be installed on the inner side of the inner installation ring 21, so as to prevent the top rotating ring 82 from moving upward under the impact of the fluid (such as crude oil, natural gas or water, etc.) inside the wellhead 1 and losing the self-locking effect on the driving ring 6 and the sealing effect of the channel 7.

[0058] The working principle of this embodiment: During the process that the driving ring 6 moves downward and the axially symmetrically and evenly distributed clamping rollers 54 form multi-point clamping on the cable 4, the linkage rod 91 will move downward following the driving ring 6 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.

[0059] By rotating the top rotating ring 82 clockwise to drive the inner connecting ring 92 and the actuating driving chute 84 to rotate clockwise. During this process, the slider 85 and the limit shaft pin 86 fixedly connected to the sealing blade 81 will slide inside the actuating driving chute 84 and the arc-shaped limiting guide rail 83 respectively, so that the central hole 87 formed by the rotation of the axially symmetric sealing blades 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 symmetric sealing blades 81 completely seal the channel 7 between the wellhead 1 and the cable 4. If there are small gaps between the cable 4 and the sealing blades 81, sealant can be used for re-sealing.

[0060] Thereafter, if the hydraulic cylinder 9 is depressurized, causing the clamping roller 54 and the fixed jacket 56 to become loose and driving the upward movement of the driving ring 6 through the abutting plate 52, the linkage rod 91 will move upward with the driving ring 6 and drive the outer rotating ring 88 to rotate clockwise through the inclined groove 90. 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 symmetric one-way driving blocks 95. At this time, the axially symmetric sealing blades 81 have completely sealed the channel 7 between the wellhead 1 and the cable 4 and cannot continue to close, that is, the top rotating ring 82 cannot rotate clockwise, making the driving ring 6 unable to move upward, thus avoiding the loosening of the clamping roller 54 and the fixed jacket 56;

[0061] Thereafter, if the axially symmetric sealing blades 81 become loose, causing the top rotating ring 82 to drive the inner connecting ring 92 to rotate counterclockwise, the clockwise rotating inner connecting ring 92 will drive the outer rotating ring 88 to rotate counterclockwise synchronously through the axially symmetric one-way driving blocks 95. The counterclockwise rotating outer rotating ring 88 will drive the linkage rod 91 to move downward through the inclined groove 90. The downward movement of the linkage rod 91 will drive the abutting plate 52 to continue to press the abutting block 57 at its bottom through the driving ring 6, causing the axially symmetric clamping roller 54 to rotate inward. At this time, the axially symmetric clamping roller 54 has completely clamped the cable 4 and cannot continue to rotate inward, that is, the driving ring 6 cannot move downward, making the top rotating ring 82 unable to rotate counterclockwise, thus avoiding the loosening of the sealing blades 81;

[0062] Finally, by lifting the top rotating ring 82 to drive the inner connecting ring 92 to move upward and separating the axially symmetric one-way driving blocks 95 from the driving grooves 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 sequence.

[0063] The main difference between this embodiment and the prior art is that: in this embodiment, by rotating the top rotating ring 82 clockwise, the axially symmetric sealing blades 81 can seal the channel 7 between the wellhead 1 and the cable 4, so as to prevent external dirt from entering the well through the channel 7 and affecting the work of the logging instrument. Moreover, the upward movement of the driving ring 6 and the counterclockwise rotation of the top rotating ring 82 restrict each other, so that the multi-point clamping and fixing effect on the cable 4 and the sealing effect on the channel 7 restrict each other, 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.

[0064] Embodiment Three

[0065] As Figure 15 shown, based on Embodiment One and Embodiment Two, a method for using a wellhead cable protective fixing device proposed by the present invention includes the following steps:

[0066] S1: Preset installation: Use a hoisting machine to lift the connecting frame 3 into the interior of the wellhead 1 and lift the wellhead installation sleeve 2 to sleeved on the top of the wellhead 1, and then use expansion bolts to firmly install the wellhead installation sleeve 2 on the top of the wellhead 1;

[0067] S2: Cable clamping: Pressurize and fill the hydraulic cylinder 9 through 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 realizing multi-point clamping of the cable 4;

[0068] S3: Cable fixing: Release the cable 4 so that the cable 4 drives the axially symmetric clamping roller 54 to rotate inward due to its own weight and the weight of the logging instrument, so that the connecting arm B55 drives the fixing clamp sleeve 56 to rotate upward to fix the cable 4, thereby realizing multi-point fixing of the cable;

[0069] S4: Channel sealing: Rotate the top rotating ring 82 clockwise to make the axially symmetric sealing blade 81 rotate to seal the channel 7 between the wellhead 1 and the cable 4. Thereafter, the upward movement of the driving ring 6 and the counterclockwise rotation of the top rotating ring 82 restrict each other, so that the function of multi-point clamping and fixing the cable 4 and the function of sealing the channel 7 restrict each other;

[0070] S5: Release function: Lift the top rotating ring 82 to make the axially symmetric one-way driving block 95 disengage from the driving groove 93 to release the self-locking function of the driving ring 6. Rotate the top rotating ring 82 counterclockwise to open the axially symmetric sealing blade 81 to seal the channel 7 between the wellhead 1 and the cable 4 to release the sealing function of the channel 7. Pressurize and fill the hydraulic cylinder 9 through a hydraulic pump to drive the driving ring 6 to move upward to release the multi-point clamping and fixing function of the cable 4. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. 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: 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); 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), the outer portion of the rectangular sleeve (51) is rotatably connected to a connecting arm A (53), the end of the connecting arm A (53) is rotatably connected to a clamping roller (54), the outer portion of the clamping roller (54) is fixedly connected to a connecting arm B (55), the end of the connecting arm B (55) is rotatably connected to a fixed roller (54), and the fixing mechanism (55) comprises ...), and an abutment plate (52) slidably connected to the interior of the rectangular sleeve (51), the outer portion of the rectangular sleeve (51) is rotatably connected to a connecting arm A (53), the end of the connecting arm A (53) is rotatably connected to a clamping roller (54), and the fixing mechanism (55) comprises 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), the outer portion of The outer part of the connecting arm A (53) is symmetrically fixedly connected with an abutment block (57) located at the bottom of the abutment plate (52); a connecting plate (58) is fixedly connected between the evenly distributed abutment plates (52); the outer part of the rectangular sleeve (51) is provided with a lower opening (59) for allowing the abutment block (57) to deflect; the outer part of the connecting arm A (53) is provided with a middle opening (60) for allowing the connecting arm B (55) and the fixed connecting sleeve (56) to pass through; and the connecting plate (58) passes between the symmetrical abutment plates (52); A driving ring (6) is fixedly connected between the abutment plates (52) located at the top; A sealing mechanism (8) for sealing a passage (7) between the wellhead (1) and the cable (4) is arranged at the top of the wellhead mounting sleeve (2), the sealing mechanism (8) comprising axially symmetrically distributed sealing blades (81), the sealing mechanism (8) further comprising a top rotating ring (82) movably connected above the top fixing ring (26) and an arc-shaped limiting guide rail (83) axially symmetrically embedded at the top of the top fixing ring (26), an execution driving slide groove (84) 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) being slidably connected inside the execution driving slide groove (84), a limiting shaft pin (86) fixedly connected to the bottom of the sealing blade (81) being movably connected inside the arc-shaped limiting guide rail (83), and the top rotating ring (82) can rotate to rotate the axially symmetrical sealing blade (81) to form a circular central hole (87); 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); and an inner connecting ring (92) located inside the outer rotating ring (88) is fixedly connected at the bottom of the top rotating ring (82). The inner side of the outer rotating ring (88) is symmetrically provided with a driving groove (93) extending to the top thereof, the outer side of the inner connecting ring (92) is 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), and the outer side of the outer rotating ring (88) is symmetrically fixedly connected to an L-shaped limiting plate (97) for preventing the top rotating ring (82) from detaching.

2. A wellhead cable protective fixing device according to claim 1, 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).

3. A wellhead cable protective fixing device according to claim 2, 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).

4. A method for using a wellhead cable protective fixing device according to claim 3, 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: by rotating the top rotating ring (82) clockwise, the axisymmetric sealing blade (81) rotates to seal the channel (7) between the wellhead (1) and the cable (4), and then the upward movement of the drive ring (6) and the counterclockwise rotation of the top rotating ring (82) are mutually constrained, so that the multi-point clamping and fixing of the cable (4) and the sealing of the channel (7) are mutually constrained; 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 action of the drive ring (6), and by rotating the top rotating ring (82) counterclockwise, the axisymmetric sealing blade (81) opens the channel (7) between the wellhead (1) and the cable (4) to release the sealing action on the channel (7), and the hydraulic cylinder (9) is pressurized and filled with oil by the hydraulic pump to drive the drive ring (6) to move upward, so as to release the multi-point clamping and fixing action on the cable (4).

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