A cable connection device for optical fiber logging

Abstract

The present invention relates to the field of optical fiber logging devices, in particular to an optical fiber logging cable connection device, comprising a fixing unit, a sealing unit arranged on the fixing unit, and a bridle unit arranged on the sealing unit; the sealing unit comprises an outer movable sleeve arranged on the fixing unit, an inner movable sleeve arranged on the outer movable sleeve, a pulling assembly arranged on the inner movable sleeve, a pushing assembly arranged on the inner movable sleeve, and a sealing assembly arranged on the outer movable sleeve and matched with the cable part, the surfaces of the outer movable sleeve and the inner movable sleeve are both provided with a zinc coating, when the inner movable sleeve is disconnected from the sealing connection part, the sealing block is matched to ensure that the interior of the outer movable sleeve continues to maintain sealing, preventing liquid from entering the outer movable sleeve through the cable part and causing corrosion to the optical fiber part, so that when the device is stuck, it can be broken by the inner movable sleeve and the sealing block while ensuring that the interior of the outer movable sleeve remains sealed, providing good protection for the optical fiber part.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber logging devices, in particular to a cable connecting device for optical fiber logging. Background Art

[0002] In oil cable logging operations, a bridle is usually used to connect the cable to the downhole instrument. When the recovery instrument and cable are stuck, the cable and instrument can be quickly separated through the weakness formed by the bridle. The cable is first retrieved and then the instrument left in the well is salvaged. However, the optical fiber core has very high requirements for insulation and sealing during use. When the cable and instrument are disconnected, the fiber break will be exposed in the well. Under the high-pressure environment in the well, the soil and liquid inside can easily corrode the disconnection point, causing the liquid to quickly invade the optical fiber protection tube, resulting in a sharp decline in optical fiber performance and easy damage to the optical cable. Summary of the Invention

[0003] The present invention is proposed in view of the problem in the above or prior art that when the cable and instrument are disconnected, the broken end of the optical fiber will be exposed in the well, and the soil and liquid inside the well will easily corrode the broken end under the high-pressure environment.

[0004] Therefore, an object of the present invention is to provide a cable connection device for optical fiber logging.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: including a fixing unit, a sealing unit arranged on the fixing unit, and a bridle unit arranged on the sealing unit; the sealing unit includes an outer movable sleeve arranged on the fixing unit, an inner movable sleeve arranged on the outer movable sleeve, a pulling assembly arranged on the inner movable sleeve, a pushing assembly arranged on the inner movable sleeve, and a sealing assembly arranged on the outer movable sleeve and cooperating with the cable part, and the surfaces of the outer movable sleeve and the inner movable sleeve are both provided with a zinc coating.

[0006] As a preferred solution of the cable connection device for optical fiber logging of the present invention, wherein: the fixing unit includes a fixing sleeve arranged on the cable protective layer, an end sealing assembly arranged on the fixing sleeve, and a fixing assembly arranged on the fixing sleeve; the end sealing assembly includes an air bag arranged in the fixing sleeve, and an inflation port arranged on the air bag, one end of the inflation port passes through the inner wall of the fixing sleeve to the outside; the fixing assembly includes a fixing plate slidably arranged on the fixing sleeve, a fastening screw arranged on the fixing plate, and a nut arranged on the fastening screw.

[0007] As a preferred solution of the optical fiber logging cable connection device of the present invention, a sealing ring 1 is provided on the inner wall of the inner movable sleeve, the sealing ring 1 is in frictional contact with the outer movable sleeve, and a sealing groove 1 is provided on the inner movable sleeve to cooperate with the sealing ring 1.

[0008] As a preferred solution of the cable connection device for optical fiber logging of the present invention, the pulling assembly includes a pulling block arranged on the inner movable sleeve near the side of the fixed sleeve, a return spring arranged on the pulling block, and an inclined surface arranged on the pulling block near the side of the fixed sleeve, and the inclined surface is inclined; the inner movable sleeve is provided with a telescopic cavity for cooperating with the pulling block.

[0009] As a preferred solution of the cable connection device for optical fiber logging of the present invention, the pushing assembly includes a pushing block arranged on the inner movable sleeve near the fixed sleeve, two return springs arranged on the pushing block, and a second inclined surface arranged on the pushing block near the bridle unit, wherein the second inclined surface is inclined; the inner movable sleeve is provided with two telescopic cavities to cooperate with the pushing block.

[0010] As a preferred solution of the optical fiber logging cable connection device of the present invention, the outer sleeve is provided with an extrusion surface matching the inclined surface 1 at one end close to the bridle unit, and an annular groove matching the push block is provided on the outer sleeve.

[0011] As a preferred solution of the cable connection device for optical fiber logging of the present invention, the sealing assembly includes an elastic member 1 provided on the outer movable sleeve and connected to the optical fiber part, a sealing block provided on the outer movable sleeve and connected to the cable part, and an elastic member 2 provided on the cable part; the optical fiber part is directly connected to the bridle unit, and the cable part is connected to the bridle unit through the sealing block.

[0012] As a preferred solution of the cable connection device for optical fiber logging of the present invention, the elastic member 1 includes a movable block 1 arranged on the optical fiber part, the movable block 1 is slidably arranged on the outer movable sleeve, and has the same extension and contraction direction as the pull spring 1, a pulling spring 1 arranged on the movable block 1, and a fixed block 1 arranged on the pulling spring 1, the fixed block 1 being fixedly arranged on the outer movable sleeve.

[0013] As a preferred solution of the cable connection device for optical fiber logging of the present invention, the elastic member 2 includes a movable block 2 arranged on the cable part, the movable block 2 is slidably arranged on the outer movable sleeve, and has the same extension and contraction direction as the pulling spring 2, a pulling spring 2 arranged on the movable block 2, and a fixed block 2 arranged on the pulling spring 2, and the fixed block 1 is fixedly arranged on the outer movable sleeve; the elastic coefficient of the pulling spring 1 is greater than that of the pulling spring 2; the outer diameter shape of the sealing block fits the inner wall of the outer movable sleeve, and a transition surface is provided on the side of the sealing block close to the outer movable sleeve; a sealing ring 3 is provided on the inner wall of the outer movable sleeve, and a protrusion is provided on the sealing ring 3, and the protrusion is arranged to be inclined toward the side close to the bridle unit.

[0014] As a preferred solution of the cable connection device for optical fiber logging of the present invention, the bridle unit includes a shell arranged on the inner movable sleeve, a sealing connection part arranged on the shell and in sliding contact with the inner wall of the inner movable sleeve, the outer diameter shape of the sealing connection part fits the inner wall of the inner movable sleeve, a second sealing ring arranged on the sealing connection part, a second sealing groove arranged on the sealing connection part to match the second sealing ring, a docking groove arranged on the sealing connection part close to the side of the outer movable sleeve, and an optical fiber connection port arranged on the sealing connection part to match the optical fiber part; when the bridle unit is in working condition, there is a gap between the outer movable sleeve and the fixed unit, and the optical fiber part is connected to the optical fiber connection port through the gap.

[0015] The beneficial effects of the optical fiber logging cable connection device of the present invention are as follows: the present invention seals one end of the cable protective layer through the airbag, strengthens the sealing between the inner movable sleeve and the sealing connection part through the sealing ring 2, so that the device maintains the sealing inside the outer movable sleeve when going down the well, and the cable protective layer and the sealing connection part are disconnected in the early stage by the galvanized inner and outer layers of the outer movable sleeve and the inner movable sleeve in conjunction with the sealing ring 1. When the outer movable sleeve slides on the inner movable sleeve, the interior of the outer movable sleeve maintains the sealing property to prevent liquid corrosion from entering the outer movable sleeve. By pulling the spring 1, the movable block 1 drives the optical fiber part Before the inner movable sleeve leaves the sealing connection part, the entire optical fiber part is sent into the outer movable sleeve. When the inner movable sleeve is disconnected from the sealing connection part, the sealing block is used to ensure that the inside of the outer movable sleeve continues to maintain sealing, preventing liquid from entering the outer movable sleeve through the cable part and corroding the optical fiber part. The sealing ring and the protrusion are then used in conjunction with the external high-pressure environment to further enhance the sealing between the sealing connection part and the outer movable sleeve. When the device is stuck, it can be broken through the inner movable sleeve and the sealing block while ensuring that the inside of the outer movable sleeve remains sealed, providing good protection for the optical fiber part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of a cable connection device for optical fiber logging.

[0018] Figure 2 This is a schematic diagram of the structure of the fixing components of the cable connection device for optical fiber logging.

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the inner movable sleeve of the cable connection device for optical fiber logging.

[0020] Figure 4 This is a schematic diagram of the structure of the outer movable sleeve of the cable connection device for optical fiber logging.

[0021] Figure 5 This is a schematic diagram of the structure of the inner movable sleeve of the cable connection device for optical fiber logging.

[0022] Figure 6 Cable connection device for optical fiber logging Figure 3 A magnified view of the structure at point A in the middle.

[0023] Figure 7 Cable connection device for optical fiber logging Figure 3 Enlarged view of the structure at point B

[0024] Figure 8 This is a schematic diagram of the cross-sectional structure of the sealing ring three of the cable connection device for optical fiber logging.

[0025] Figure 9 This is a schematic diagram of the structure of the outer movable sleeve of the cable connection device for optical fiber logging.

[0026] Figure 10 This is a schematic diagram of the structure of the bridle unit of the cable connection device for optical fiber logging.

[0027] In the figure: 1. Fiber optic cable; 11. Cable protective layer; 12. Fiber optic part; 13. Cable part; 2. Fixing unit; 21. Fixing sleeve; 22. End sealing assembly; 221. Air bag; 222. Inflating port; 23. Fixing assembly; 231. Fixing plate; 232. Fastening screw; 233. Nut; 3. Sealing unit; 31. Outer sleeve; 311. Extrusion surface; 312. Annular groove; 313. Sealing ring three; 3131. Protrusion; 32. Inner sleeve; 321. Sealing ring one; 322. Sealing groove one; 323. Telescopic chamber one; 324. Telescopic chamber two; 33. Pulling assembly; 331. Pulling block ; 332. Return spring one; 333. Inclined surface one; 34. Pushing assembly; 341. Pushing block; 342. Return spring two; 343. Inclined surface two; 35. Sealing assembly; 351. Elastic part one; 3511. Movable block one; 3512. Pulling spring one; 3513. Fixed block one; 352. Sealing block; 3521. Transition surface; 353. Elastic part two; 3531. Movable block two; 3532. Pulling spring two; 3533. Fixed block two; 4. Bridle unit; 41. Shell; 42. Sealing connection part; 43. Sealing ring two; 44. Sealing groove two; 45. Docking groove; 46. Optical fiber connection port. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1, with reference to Figure 1-Figure 3 , which is a first embodiment of the present invention, provides a fiber optic logging cable connection device, comprising: a fixing unit 2 for fixing to a cable protective layer 11; a sealing unit 3 disposed on the fixing unit 2 for protecting a fiber optic portion 12 from liquid immersion; and a bridle unit 4 disposed on the sealing unit 3 for connecting the fiber optic portion 12 and the cable portion 13 and cooperating with the sealing unit 3 to isolate the fiber optic portion 12 from the wellbore environment during operation;

[0030] The sealing unit 3 includes an outer movable sleeve 31 provided on the fixing unit 2, which is used to connect the optical fiber part 12 and the cable part 13, cooperate with the movement of the cable protective layer 11, and control the connection state of the cable part 13 and the bridle unit 4; an inner movable sleeve 32 provided on the outer movable sleeve 31, which is used to cooperate with the bridle unit 4 to seal one end of the outer movable sleeve 31; a pulling component 33 provided on the inner movable sleeve 32, which is used to cooperate with the pulling of the outer movable sleeve 31 to pull the inner movable sleeve 32 when it is stuck, so that the inner movable sleeve 32 is disconnected from the bridle unit 4 for easy recovery; a pushing component 34 provided on the inner movable sleeve 32, which is used to cooperate with the outer movable sleeve The push of the movable sleeve 31 drives the inner movable sleeve 32 to move toward the bridle unit 4, pushing the bridle unit 4 to realize the movement of the device underground, and the sealing assembly 35 arranged on the outer movable sleeve 31 and cooperating with the cable part 13 is used to drive the cable part 13 to dock with the bridle unit 4. At the same time, when the inner movable sleeve 32 is disconnected from the bridle unit 4, the interior of the outer movable sleeve 31 is kept in a sealed state. The surfaces of the outer movable sleeve 31 and the inner movable sleeve 32 are both provided with a zinc coating. The galvanizing can effectively prevent corrosion of the gaps in the device under the high temperature and high pressure environment in the well, and prevent liquid from seeping into the interior of the outer movable sleeve 31 from the gap to damage the optical fiber part 12.

[0031] The fixing unit 2 includes a fixing sleeve 21 provided on the cable protective layer 11 for fixing and supporting, an end sealing assembly 22 provided on the fixing sleeve 21 for wrapping the outside of the cable protective layer 11 to prevent the well liquid from entering the outer movable sleeve 31 through the end sealing assembly 22, and a fixing assembly 23 provided on the fixing sleeve 21 for achieving fixation between the cable protective layer 11 and the fixing sleeve 21.

[0032] The end sealing assembly 22 includes an airbag 221 disposed in the fixing sleeve 21, which is used to expand and fill the space between the cable protective layer 11 and the inner wall of the fixing sleeve 21 to form a seal, and an inflation port 222 disposed on the airbag 221. One end of the inflation port 222 penetrates the inner wall of the fixing sleeve 21 to the outside. The inflation port 222 is used to fill the airbag 221 with gas. The injected gas is hydrogen. Due to the high temperature and humidity in the well environment, the pressure increases as you go deeper into the well. The high pressure in the well will squeeze the inflation port 222. However, when hydrogen is heated, it will rapidly accelerate the molecular motion, driving the airbag 221 to expand, offsetting the squeezing of the airbag 221 by the high pressure, and maintaining the sealing effect between the cable protective layer 11 and the fixing sleeve 21.

[0033] The fixing assembly 23 includes a fixing plate 231 slidably arranged on the fixing sleeve 21, a fastening screw 232 arranged on the fixing plate 231, and a nut 233 arranged on the fastening screw 232. The fixing plate 231 is used to cooperate with the fastening screw 232 and the nut 233 to clamp and fix the cable protective layer 11. The side of the fixing plate 231 that clamps the cable protective layer 11 is set as an arc surface, which is used to increase the contact area with the cable protective layer 11 and improve the fastening effect.

[0034] In summary, when logging operations are to be performed, the cable protective layer 11 is passed through the fixed sleeve 21 and into the outer movable sleeve 31. At this time, the ends of the optical fiber portion 12 and the cable portion 13 exceed the outer movable sleeve 31. At this time, the optical fiber portion 12 and the cable portion 13 are connected to the sealing component 35. At this time, hydrogen is filled into the airbag 221 through the inflation port 222 to expand the airbag 221 to fill the gap between the cable protective layer 11 and the fixed sleeve 21 to form a seal. At this time, the cable protective layer 11 is fixed by the fixing plate 231, so that the fixing unit 2 is firmly fixed on the cable protective layer 11. At this time, the sealing component 35 is connected to the bridle unit 4. Docking enables communication between the optical fiber cable 1 and the bridle unit 4. At this time, the inner movable sleeve 32 is docked with the bridle unit 4. At this time, the interior of the outer movable sleeve 31 is in a sealed state, and logging operations can be carried out down the well. When it is stuck, the cable protective layer 11 drives the outer movable sleeve 31 to continue to move compared with the inner movable sleeve 32 through the fixed sleeve 21, until the sealing assembly 35 drives the optical fiber part 12 to retract into the outer movable sleeve 31 and seals the outer movable sleeve 31. At this time, the outer movable sleeve 31 is in contact with the inner movable sleeve 32, and the outer movable sleeve 31 drives the inner movable sleeve 32 to continue to move, so that the inner movable sleeve 32 is separated from the bridle unit 4, completing the disconnection.

[0035] Example 2, reference Figures 1-9This is the second embodiment of the present invention. It differs from the previous embodiment in that the interior of the outer sleeve 31 remains sealed during the disengagement process. Compared to the first embodiment, a sealing ring 321 is further provided on the inner wall of the inner sleeve 32. The sealing ring 32 is in frictional contact with the outer sleeve 31. The sealing ring 321 is used to improve the sealing effect between the inner sleeve 32 and the outer sleeve 31, while also providing resistance to the sliding movement between the outer sleeve 31 and the inner sleeve 32. The inner sleeve 32 is provided with a sealing groove 322 that cooperates with the sealing ring 321 and is used to accommodate the sealing ring 321.

[0036] The pulling assembly 33 includes a pulling block 331 disposed on the inner movable sleeve 32 near the fixed sleeve 21 for extension and contraction to provide a position limiting effect; a return spring 332 disposed on the pulling block 331 for driving the pulling block 331 to return to its original position after extension and contraction; and an inclined surface 333 disposed on the pulling block 331 near the fixed sleeve 21. The inclined surface 333 is inclined and is used to drive the pulling block 331 to contract when squeezed.

[0037] The inner movable sleeve 32 is provided with a telescopic cavity 323 for cooperating with the pulling block 331, so as to enable the pulling block 331 to perform telescopic movement.

[0038] The pushing assembly 34 includes a pushing block 341 provided on the inner movable sleeve 32 near the fixed sleeve 21 for extension and contraction to play a limiting effect, a second return spring 342 provided on the pushing block 341 for driving the pushing block 341 to return to its original position after extension and contraction, and a second inclined surface 343 provided on the pushing block 341 near the bridle unit 4. The inclined surface 343 is inclined and is used to drive the pushing block 341 to retract when squeezed.

[0039] The inner movable sleeve 32 is provided with a second telescopic cavity 324 cooperating with the pushing block 341 for pushing the block 341 to perform telescopic movement.

[0040] Among them, the outer movable sleeve 31 is provided with an extrusion surface 311 that cooperates with the inclined surface 1 333 at one end close to the bridle unit 4. When the outer movable sleeve 31 and the inner movable sleeve 32 return to their original positions, the extrusion surface 311 squeezes the pushing block 341, driving the pushing block 341 to retract into the telescopic cavity 2 324, so that the outer movable sleeve 31 and the inner movable sleeve 32 return to their initial states. The outer movable sleeve 31 is provided with an annular groove 312 that cooperates with the pushing block 341, which is used to engage with the pushing block 341. The inner movable sleeve 32 is driven to move toward the bridle unit 4 through the extrusion of the pushing block 341, so that the outer movable sleeve 31 and the inner movable sleeve 32 remain in a relatively static state when the well is lowered.

[0041] Among them, the bridle unit 4 includes a shell 41 arranged on the inner movable sleeve 32, which plays a protective role, a sealing connection part 42 arranged on the shell 41 and in sliding contact with the inner wall of the inner movable sleeve 32, which is used to connect the optical fiber part 12 and the cable part 13 for communication, and the outer diameter shape of the sealing connection part 42 fits the inner wall of the inner movable sleeve 32, which is used to cooperate with the inner movable sleeve 32 to seal the inside of the outer movable sleeve 31, and a sealing ring 2 43 arranged on the sealing connection part 42, which is used to improve the sealing effect between the sealing connection part 42 and the inner movable sleeve 32, and at the same time provide resistance to the mutual sliding between the sealing connection part 42 and the inner movable sleeve 32. The number of the sealing ring 2 43 is more than the sealing ring 1 321, that is, the resistance between the sealing connection part 42 and the inner movable sleeve 32 is greater than the resistance between the inner movable sleeve 32 and the outer movable sleeve 31, so when the cable protective layer 11 is pulled, the annular The slot 312 squeezes the pushing block 341 into the telescopic cavity 2 324 through the inclined surface 343. At this time, the outer movable sleeve 31 moves relative to the inner movable sleeve 32, and the inner movable sleeve 32 and the sealing connection part 42 remain relatively stationary. When the outer movable sleeve 31 drives the annular slot 312 to move below the pulling block 331, the pulling block 331 is engaged with the annular slot 312, and the outer movable sleeve 31 drives the inner movable sleeve 32 to continue moving through the pulling block 331. At this time, the inner movable sleeve 32 starts to move relative to the sealing connection part 42, and the sealing groove 2 44 provided on the sealing connection part 42 to cooperate with the sealing ring 2 43 is used to install the sealing ring 2 43, and the docking groove 45 provided on the sealing connection part 42 close to the side of the outer movable sleeve 31 is used to connect the cable part 13, and the optical fiber connection port 46 provided on the sealing connection part 42 to cooperate with the optical fiber part 12 is used to connect the optical fiber part 12.

[0042] The rest of the structure is the same as that of Example 1.

[0043] In summary, when preparing to go downhole operations, one end of the cable protective layer 11 is first fixed by the end sealing component 22 and the fixing component 23, so that the optical fiber part 12 and the cable part 13 enter the outer movable sleeve 31. At this time, the optical fiber part 12 and the cable part 13 are connected to the optical fiber connection port 46 and the docking groove 45 respectively through the sealing component 35. At this time, the inner movable sleeve 32 is docked with the sealing connection part 42, and the sealing between the sealing connection part 42 and the inner movable sleeve 32 is improved by the sealing ring 43. At this time, the device is put into the well for operation. When the operation is completed, the cable protective layer 11 drives the device to be retracted as a whole. When it is stuck, at this time, since the friction between the sealing connection part 42 and the inner movable sleeve 32 is greater than the friction between the outer movable sleeve 31 and the inner movable sleeve 32, the outer movable sleeve 31 follows the cable protective layer 11 and moves compared with the inner movable sleeve 32. When the locking cam 331 is unlocked, the locking cam 331 is unlocked and the locking cam 332 is unlocked, and the locking cam 331 is unlocked, and the cam 332 is unlocked, and the cam 332 is unlocked.

[0044] When the cable protective layer 11 needs to be restored after the inner movable sleeve 32 is retracted, the inner movable sleeve 32 is pushed in the direction of the outer movable sleeve 31. At this time, the annular groove 312 squeezes the inclined surface 333, and the pulling block 331 is driven into the telescopic cavity 1 323 through the return spring 1 332. At this time, the inner movable sleeve 32 can continue to move. At this time, the extrusion surface 311 squeezes the pushing block 341, and the returning spring 2 342 drives the pushing block 341 to retract into the telescopic cavity 2 324 until the annular groove 312 moves to the bottom of the pushing block 341. At this time, the return spring 2 342 is released, driving the pushing block 341 to engage with the annular groove 312. At this time, the outer movable sleeve 31 and the inner movable sleeve 32 are restored to their initial state and can be used for the next logging operation.

[0045] Example 3, reference Figures 1-10, which is the second embodiment of the present invention, differs from the previous embodiment in that: after the separation is completed, liquid is prevented from entering the optical fiber portion 12. Compared with embodiment 2, the sealing assembly 35 further includes an elastic member 1 351 provided on the outer movable sleeve 31 and connected to the optical fiber portion 12, for connecting to the optical fiber portion 12 and driving the optical fiber portion 12 to move, a sealing block 352 provided on the outer movable sleeve 31 and connected to the cable portion 13, for connecting to the cable portion 13 and moving with the movement of the cable portion 13, and an elastic member 2 353 provided on the cable portion 13, for connecting to the cable portion 13 and driving the cable portion 13 to move;

[0046] The optical fiber portion 12 is directly connected to the bridle unit 4, and the cable portion 13 is connected to the bridle unit 4 through the sealing block 352. When the bridle unit 4 is in the working state, there is a gap between the outer movable sleeve 31 and the fixed unit 2, and the optical fiber portion 12 is connected to the optical fiber connection port 46 through the gap. Through this arrangement, the optical fiber portion 12 and the cable portion 13 can be moved separately.

[0047] Among them, the elastic member 351 includes a movable block 3511 arranged on the optical fiber part 12, the movable block 3511 is slidably arranged on the outer movable sleeve 31, and has the same extension and contraction direction as the pulling spring 3512, and is used to connect the optical fiber part 12 to drive the optical fiber part 12 to move, a pulling spring 3512 arranged on the movable block 3511, which is used to deform to generate elastic force to pull the movable block 3511, thereby driving the movable block 3511 to move, and a fixed block 3513 arranged on the pulling spring 3512, which is fixedly arranged on the outer movable sleeve 31, and is used to drive the pulling spring 3512 to stretch as the outer movable sleeve 31 moves to generate a pulling force on the movable block 3511, thereby driving the movable block 3511 to move.

[0048] Among them, the second elastic member 353 includes a second movable block 3531 provided on the cable portion 13, the second movable block 3531 is slidably provided on the outer movable sleeve 31, and has the same expansion and contraction direction as the second pulling spring 3532, and is used to connect the cable portion 13, drive the cable portion 13 and the sealing block 352 to move, the second pulling spring 3532 provided on the second movable block 3531, and is used to deform to generate elastic force to pull the second movable block 3531, thereby driving the second movable block 3531 to move; and the second fixed block 3533 provided on the second pulling spring 3532, the first fixed block 3513 is fixedly provided on the outer movable sleeve 31, and is used to drive the second pulling spring 3532 to stretch as the outer movable sleeve 31 moves to generate a pulling force on the second movable block 3531, thereby driving the second movable block 3531 to move;

[0049] The elastic coefficient of the first pulling spring 3512 is greater than that of the second pulling spring 3532. Under the same degree of deformation, the elastic force generated by the first pulling spring 3512 is greater than that generated by the second pulling spring 3532. That is, the first pulling spring 3512 first drives the optical fiber portion 12 to retract into the outer movable sleeve 31, and the second pulling spring 3532 then drives the sealing unit 3 and the sealing block 352 to seal the outer movable sleeve 31.

[0050] The outer diameter of the sealing block 352 fits the inner wall of the outer sleeve 31. A transition surface 3521 is provided on the side of the sealing block 352 close to the outer sleeve 31, so that the sealing block 352 can enter the outer sleeve 31 and fit the inner wall of the outer sleeve 31 as the cable portion 13 is pulled.

[0051] A sealing ring 313 is provided on the inner wall of the outer movable sleeve 31, and a protrusion 3131 is provided on the sealing ring 313. The protrusion 3131 is set to be inclined toward the side close to the bridle unit 4. When the sealing block 352 enters the outer movable sleeve 31, the sealing block 352 squeezes the protrusion 3131 to form a seal for the inside of the outer movable sleeve 31. When the sealing connection part 42 is disconnected from the inner movable sleeve 32, one side of the sealing block 352 is exposed to the well. At this time, the high temperature and high pressure environment in the well and the low pressure environment inside the outer movable sleeve 31 form a pressure difference, which squeezes the sealing block 352 into the outer movable sleeve 31 and cooperates with the protrusion 3131 to strengthen the sealing core between the sealing block 352 and the outer movable sleeve 31 to prevent the liquid in the well from entering the outer movable sleeve 31 through the high pressure environment and causing damage to the optical fiber part 12.

[0052] The rest of the structure is the same as that of Example 2.

[0053] In summary, when the device is stuck, the cable protective layer 11 drives the outer movable sleeve 31 to continue to move through the fixed sleeve 21. At this time, the outer movable sleeve 31 drives the fixed block 1 3513 and the fixed block 2 3533 to move. At this time, the pulling spring 1 3512 and the pulling spring 2 3532 are synchronously stretched and deformed. At this time, the pulling spring 1 3512 and the pulling spring 2 3532 respectively generate pulling forces on the movable block 1 3511 and the movable block 2 3531. Since the elastic coefficient of the pulling spring 1 3512 is greater than that of the pulling spring 2 3532, under the same degree of deformation, the elastic force generated by the pulling spring 1 3512 is greater than the elastic force generated by the pulling spring 2 3532. When the pulling force generated by the pulling spring 1 3512 is greater than the force of the connection between the optical fiber part 12 and the optical fiber connection port 46, the pulling spring 1 3512 is pulled through the movable block 1 3511 The optical fiber part 12 is driven to retract into the outer movable sleeve 31 first. When the pulling force generated by the pulling spring 2 3532 is greater than the connecting force between the optical fiber part 12 and the docking groove 45, the pulling spring 2 3532 drives the cable part 13 to retract into the outer movable sleeve 31 through the movable block 2 3531. At this time, the sealing block 352 enters the outer movable sleeve 31 as the cable part 13 moves. At this time, the sealing block 352 squeezes the protrusion 3131 to form a seal with the inside of the outer movable sleeve 31. When the sealing connection part 42 is disconnected from the inner movable sleeve 32, one side of the sealing block 352 is exposed to the well. At this time, the high temperature and high pressure environment in the well and the low pressure environment inside the outer movable sleeve 31 form a pressure difference, which squeezes the sealing block 352 into the outer movable sleeve 31, and cooperates with the protrusion 3131 to further enhance the sealing between the sealing block 352 and the outer movable sleeve 31.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A cable connection device for optical fiber logging, comprising an optical fiber cable (1), the optical fiber cable (1) comprising a cable protective layer (11), an optical fiber portion (12) disposed on the cable protective layer (11), and a cable portion (13) disposed on the cable protective layer (11), characterized in that: It comprises a fixing unit (2), a sealing unit (3) arranged on the fixing unit (2), and a bridle unit (4) arranged on the sealing unit (3); The fixing unit (2) includes a fixing sleeve (21) provided on the cable protective layer (11), an end sealing component (22) provided on the fixing sleeve (21), and a fixing component (23) provided on the fixing sleeve (21); The end sealing assembly (22) includes an airbag (221) disposed in the fixed sleeve (21), and an inflation port (222) disposed on the airbag (221), wherein one end of the inflation port (222) penetrates the inner wall of the fixed sleeve (21) to the outside; The fixing assembly (23) includes a fixing plate (231) slidably disposed on the fixing sleeve (21), a fastening screw (232) disposed on the fixing plate (231), and a nut (233) disposed on the fastening screw (232); A sealing ring (321) is provided on the inner wall of the inner movable sleeve (32), the sealing ring (321) is in frictional contact with the outer movable sleeve (31), and a sealing groove (322) is provided on the inner movable sleeve (32) to cooperate with the sealing ring (321); The pulling assembly (33) includes a pulling block (331) provided on the inner movable sleeve (32) near the fixed sleeve (21), a return spring (332) provided on the pulling block (331), and an inclined surface (333) provided on the pulling block (331) near the fixed sleeve (21), wherein the inclined surface (333) is inclined. The inner movable sleeve (32) is provided with a telescopic cavity (323) for cooperating with the pulling block (331); The pushing assembly (34) includes a pushing block (341) provided on the inner movable sleeve (32) near the fixed sleeve (21), a second return spring (342) provided on the pushing block (341), and a second inclined surface (343) provided on the pushing block (341) near the bridle unit (4), wherein the second inclined surface (343) is inclined. The inner movable sleeve (32) is provided with a second telescopic cavity (324) cooperating with a push block (341); The sealing unit (3) includes an outer movable sleeve (31) arranged on the fixed unit (2), an inner movable sleeve (32) arranged on the outer movable sleeve (31), a pulling component (33) arranged on the inner movable sleeve (32), a pushing component (34) arranged on the inner movable sleeve (32), and a sealing component (35) arranged on the outer movable sleeve (31) and cooperating with the cable part (13). The surfaces of the outer movable sleeve (31) and the inner movable sleeve (32) are both provided with a zinc coating.

2. The optical fiber logging cable connection device according to claim 1, wherein: An extrusion surface (311) that matches the first inclined surface (333) is provided at one end of the outer movable sleeve (31) close to the bridle unit (4), and an annular groove (312) that matches the push block (341) is provided on the outer movable sleeve (31).

3. The optical fiber logging cable connection device according to claim 2, wherein: The sealing assembly (35) includes an elastic member 1 (351) provided on the outer movable sleeve (31) and connected to the optical fiber portion (12), a sealing block (352) provided on the outer movable sleeve (31) and connected to the cable portion (13), and an elastic member 2 (353) provided on the cable portion (13); The optical fiber portion (12) is directly connected to the bridle unit (4), and the cable portion (13) is connected to the bridle unit (4) via a sealing block (352).

4. The optical fiber logging cable connection device according to claim 3, wherein: The elastic member (351) includes a movable block (3511) provided on the optical fiber portion (12), the movable block (3511) being slidably provided on the outer movable sleeve (31), a pulling spring (3512) provided on the movable block (3511) and having the same extension and contraction direction as the pulling spring (3512), and a fixed block (3513) provided on the pulling spring (3512), the fixed block (3513) being fixedly provided on the outer movable sleeve (31).

5. The optical fiber logging cable connection device according to claim 4, characterized in that: The second elastic member (353) includes a second movable block (3531) provided on the cable portion (13), the second movable block (3531) being slidably provided on the outer movable sleeve (31), and having the same extension and contraction direction as the second pulling spring (3532), a second pulling spring (3532) provided on the second movable block (3531), and a second fixed block (3533) provided on the second pulling spring (3532), and the first fixed block (3513) being fixedly provided on the outer movable sleeve (31); The elastic coefficient of the pulling spring 1 (3512) is greater than that of the pulling spring 2 (3532); The outer diameter of the sealing block (352) fits the inner wall of the outer movable sleeve (31), and a transition surface (3521) is provided on one side of the sealing block (352) close to the outer movable sleeve (31); A sealing ring 3 (313) is provided on the inner wall of the outer movable sleeve (31), and a protrusion (3131) is provided on the sealing ring 3 (313), and the protrusion (3131) is arranged to be inclined toward a side close to the bridle unit (4).

6. The optical fiber logging cable connection device according to claim 5, characterized in that: The bridle unit (4) includes a housing (41) provided on the inner movable sleeve (32), a sealing connection portion (42) provided on the housing (41) and in sliding contact with the inner wall of the inner movable sleeve (32), the outer diameter of the sealing connection portion (42) being in contact with the inner wall of the inner movable sleeve (32), a second sealing ring (43) provided on the sealing connection portion (42), a second sealing groove (44) provided on the sealing connection portion (42) and matching the second sealing ring (43), a docking groove (45) provided on the sealing connection portion (42) near the side of the outer movable sleeve (31), and an optical fiber connection port (46) provided on the sealing connection portion (42) and matching the optical fiber portion (12); When the bridle unit (4) is in a working state, a gap exists between the outer movable sleeve (31) and the fixed unit (2), and the optical fiber portion (12) is connected to the optical fiber connection port (46) through the gap.

Images