Distributed logging optical fiber fishing device and optical fiber fishing method

Abstract

The invention relates to the technical field of optical fiber salvaging, in particular to a distributed logging optical fiber salvaging device and an optical fiber salvaging method.The distributed logging optical fiber salvaging device comprises an outer cylinder, an inner cylinder, an end cover, a connecting sleeve, a ball, a limiting spring and a salvaging device.A flow channel with an upward opening is formed in the middle of the inner cylinder, a mounting table is integrally arranged at the lower end of the inner cylinder, and the outer cylinder is arranged on the outer side of the lower portion of the inner cylinder in a sleeving mode; a limiting spring is connected between the lower side of the outer barrel and the upper side of the mounting table, at least two outer leakage holes are evenly distributed in the middle of the outer barrel, the included angle between each outer leakage hole and the axis direction is 45 degrees, and inner leakage holes are formed in the positions, corresponding to the outer leakage holes, of the inner barrel. The device is reasonable and compact in structure and convenient to use, the fishing device is arranged to fish the optical fiber, the optical fiber winding condition is judged according to the communication condition of the drainage hole, reliable winding of the optical fiber is ensured, and therefore the reliability of fishing the optical fiber is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber salvage, and relates to a distributed well logging optical fiber salvage device and an optical fiber salvage method. Background Art

[0002] Optical fiber is increasingly used in logging. Due to its small diameter and relatively poor load-bearing capacity, the load on the optical fiber gradually increases as the depth of the well increases during logging. Under the combined effect of other additional loads, the weak parts of the optical fiber are easily broken and fall into the wellbore, causing logging accidents. Once the optical fiber falls into the wellbore, in order not to affect the drilling and logging operations, reduce the drilling and completion operation time, and save the drilling and completion costs, it is necessary to promptly salvage the optical fiber that has fallen into the wellbore. Summary of the invention

[0003] The present invention provides a distributed logging optical fiber salvage device and an optical fiber salvage method, which overcome the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing optical fiber falls into the wellbore and is inconvenient to salvage, affecting construction operations.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a distributed well logging optical fiber salvage device, comprising an outer tube, an inner tube, an end cover, a connecting sleeve, a ball, a limit spring, and a salvage device. A flow channel opening upward is provided in the middle of the inner tube, a mounting platform is integrally provided at the lower end of the inner tube, the outer tube is sleeved on the outer side of the lower part of the inner tube, a limit spring is connected between the lower side of the outer tube and the upper side of the mounting platform, at least two external leakage flow holes are evenly distributed in the middle of the outer tube, the external leakage flow holes form an angle of 45 degrees with the axial direction, an internal leakage flow hole is provided on the inner tube corresponding to each external leakage flow hole position, the angle of the internal leakage flow hole is consistent with the angle of the external leakage flow hole, the internal leakage flow hole is connected with the flow channel, and the internal leakage flow hole is connected with the external leakage flow hole, a connecting groove is provided on the outer side of the upper end of the inner tube, a connecting sleeve sleeved on the inner tube is provided in the connecting groove, a thread is provided on the outer side of the connecting sleeve, an end cover connected to the inner tube thread is provided on the upper side of the connecting sleeve, a mounting groove with openings opposite to each other is provided between the end cover and the connecting sleeve, a ball is provided in the mounting groove, and a salvage device is provided on the outer side of the outer tube.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned salvage device may include a left salvage hook, a right salvage hook and a preload spring. The upper parts of the left salvage hook and the right salvage hook are installed on the outer tube through a hinge shaft, and a preload spring is provided between the left salvage hook and the right salvage hook at a position below the hinge shaft.

[0006] The above-mentioned salvage device may also include a line-pressing mechanism, which includes a push rod, a pin buckle, a hinge, and a pressure rod. The pin buckle is installed on the outer tube, and a push rod is hinged on the outer side of the upper end of the right salvage hook. The end of the push rod is located in the pin buckle, and a hinge is provided on the outer tube corresponding to the position below the push rod. A pressure rod is installed on the hinge, and the push rod can block the pressure rod.

[0007] The front and rear sides of the outer cylinder may be provided with salvaging devices, and the two sets of salvaging devices have the same structure and are symmetrically distributed front to back.

[0008] A circle of limiting grooves may be provided on the upper side of the mounting platform, and the limiting springs are installed in the limiting grooves.

[0009] The second technical solution of the present invention is achieved by the following measures: a method for optical fiber salvage, which is carried out according to the following method, wherein the continuous tubing is connected through the threaded connection on the connecting sleeve, and the continuous tubing lowers the distributed logging optical fiber salvage device to the specified position of the wellbore, and the drilling fluid enters the flow channel in the inner tube and is discharged from the inner leakage hole and the outer leakage hole in turn, generating a torque of rotation around the axis, thereby driving the inner tube and the outer tube to rotate, driving the left salvage hook and the right salvage hook to rotate, and the left salvage hook and the right salvage hook are entangled with the optical fiber, and the gravity of the optical fiber pushes The lower parts of the left and right salvage hooks are moved closer, and the upper part of the right salvage hook drives the push rod to move rightward. After the push rod is disengaged from the latch buckle, the pressure rod loses support and falls forward, pressing the optical fiber wound on the left and right salvage hooks. When the weight of the wound optical fiber is heavy, the outer tube will be pulled downward to stagger the inner leakage hole and the outer leakage hole. The drilling fluid flow and pressure parameters in the continuous tubing are used to determine that the optical fiber has been wound on the left and right salvage hooks. The distributed logging optical fiber salvage device is lifted and taken out from the wellbore to complete the optical fiber salvage.

[0010] The present invention has a reasonable and compact structure and is easy to use. It salvages the optical fiber by arranging a salvaging device, and judges the winding condition of the optical fiber by the connectivity of the leakage hole, thereby ensuring reliable winding of the optical fiber and thus ensuring the reliability of the salvaged optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a schematic diagram of a partial cross-sectional structure of a front view of an embodiment of the present invention.

[0012] Attached Figure 2 For attachment Figure 1 Schematic diagram of the top view structure.

[0013] The codes in the accompanying drawings are: 1 is an outer cylinder, 2 is an inner cylinder, 3 is an end cover, 4 is a connecting sleeve, 5 is a ball, 6 is a limit spring, 7 is a flow channel, 8 is a mounting platform, 9 is an external leakage flow hole, 10 is an internal leakage flow hole, 11 is a left salvage hook, 12 is a right salvage hook, 13 is a preload spring, 14 is a push rod, 15 is a latch buckle, 16 is a hinge, 17 is a pressure rod, and 18 is a limit groove. DETAILED DESCRIPTION

[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0015] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0016] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2 As shown, the distributed logging optical fiber fishing device comprises an outer tube 1, an inner tube 2, an end cover 3, a connecting sleeve 4, a ball 5, a limit spring 6, and a fishing device. A flow channel 7 opening upward is provided in the middle of the inner tube 2, a mounting platform 8 is integrally provided at the lower end of the inner tube 2, the outer tube 1 is sleeved on the outer side of the lower part of the inner tube 2, and a limit spring 6 is connected between the lower side of the outer tube 1 and the upper side of the mounting platform 8. At least two external leakage holes 9 are evenly distributed in the middle of the outer tube 1, and the external leakage holes 9 are at an angle of 45 degrees to the axial direction. The upper surface of the inner tube 2 corresponding to each position of the external leakage hole 9 is provided with a ball 5, and the ball 6 is provided with a limit spring 6. An inner leakage hole 10 is provided, the angle of the inner leakage hole 10 is consistent with that of the outer leakage hole 9, the inner leakage hole 10 is communicated with the flow channel 7, the inner leakage hole 10 is communicated with the outer leakage hole 9, a connecting groove is provided on the outer side of the upper end of the inner tube 2, a connecting sleeve 4 is provided in the connecting groove and is sleeved on the inner tube 2, a thread is provided on the outer side of the connecting sleeve 4, an end cover 3 threadedly connected to the inner tube 2 is provided on the upper side of the connecting sleeve 4, a mounting groove with openings opposite to each other is provided between the end cover 3 and the connecting sleeve 4, a ball 5 is provided in the mounting groove, and a salvage device is provided on the outer side of the outer tube 1.

[0017] Four external leakage holes 9 and four internal leakage holes 10 are set as needed. The connecting sleeve 4 is connected to the continuous oil pipe with threads on the outside. Under the condition that the continuous oil pipe remains stationary, the inner tube 2 and the outer tube 1 can rotate relative to the continuous oil pipe under the action of the circumferential moment. The present invention is placed in the designated position of the wellbore through the continuous oil pipe, and the drilling fluid enters the flow channel 7 in the inner tube 2 and is discharged from the internal leakage hole 10 and the external leakage hole 9 in turn. Since the leakage holes are 45 degrees, a moment of rotation around the axis is generated, thereby driving the inner tube 2 and the outer tube 1 to rotate, so that the salvage device winds the optical fiber. When the weight of the optical fiber is sufficient, the outer tube 1 will be pulled downward, so that the internal leakage hole 10 and the external leakage hole 9 are staggered, and the drilling fluid parameters in the continuous oil pipe will change. According to the actual situation, when the flow rate and pressure reach a certain value, it proves that the optical fiber is wound enough, and the continuous oil pipe begins to be lifted, so that the bottom optical fiber is salvaged out of the well. It has high reliability and large carrying capacity, can judge the optical fiber winding situation and is easy to maintain.

[0018] The above-mentioned distributed logging optical fiber fishing device can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2As shown, the salvage device includes a left salvage hook 11, a right salvage hook 12 and a preload spring 13. The upper parts of the left salvage hook 11 and the right salvage hook 12 are mounted on the outer tube 1 through a hinge shaft, and a preload spring 13 is provided between the left salvage hook 11 and the right salvage hook 12 at a position below the hinge shaft.

[0019] The left fishing hook 11 and the right fishing hook 12 are arranged to wind the optical fiber, and the pre-tightening spring 13 is used to open the left fishing hook 11 and the right fishing hook to a certain angle, so as to facilitate the action of the wire pressing mechanism.

[0020] Embodiment 3: As attached Figure 1 , 2 As shown, the salvage device also includes a line pressing mechanism, which includes a push rod 14, a latch buckle 15, a hinge 16, and a pressure rod 17. The latch buckle 15 is installed on the outer tube 1, and the push rod 14 is hinged on the outer side of the upper end of the right salvage hook 12. The end of the push rod 14 is located in the latch buckle 15. A hinge 16 is provided on the outer tube 1 corresponding to the position below the push rod 14, and a pressure rod 17 is installed on the hinge 16. The push rod 14 can block the pressure rod 17.

[0021] When the weight of the optical fiber is pulled down, the left salvage hook 11 and the right salvage hook approach each other, and the upper end of the right salvage hook 12 moves to the right, so that the push rod 14 moves to the right and escapes from the latch buckle 15, so that the front part of the pressure rod 17 is not blocked, and the pressure rod 17 falls forward to press the wound optical fiber to prevent the optical fiber from loosening and falling off.

[0022] Embodiment 4: As attached Figure 1 , 2 As shown, the front and rear sides of the outer cylinder 1 are both provided with salvage devices, and the two sets of salvage devices have the same structure and are symmetrically distributed front and back. The two sets of salvage devices are arranged front and back to balance the force on the inner cylinder 2 and the outer cylinder 1, and the practical life is longer.

[0023] Embodiment 5: As attached Figure 1 As shown, a circle of limiting grooves 18 are provided on the upper side of the mounting platform 8, and the limiting spring 6 is installed in the limiting grooves 18. The position of the limiting spring 6 is limited by setting the limiting grooves 18.

[0024] Embodiment 6: As attached Figure 1 , 2As shown, the optical fiber salvage method is performed according to the following method. The continuous tubing is connected through the thread on the connecting sleeve 4. The continuous tubing lowers the distributed logging optical fiber salvage device to the specified position of the wellbore. The drilling fluid enters the flow channel 7 in the inner tube 2 and is discharged from the inner leakage hole 10 and the outer leakage hole 9 in sequence, generating a torque rotating around the axis, thereby driving the inner tube 2 and the outer tube 1 to rotate, driving the left salvage hook 11 and the right salvage hook 12 to rotate, and the left salvage hook 11 and the right salvage hook 12 are wound around the optical fiber. The gravity of the optical fiber pushes the lower parts of the left salvage hook 11 and the right salvage hook 12. When the left and right fishing hooks 11 and 12 are close to each other, the upper part of the right fishing hook 12 drives the push rod 14 to move rightward. After the push rod 14 is separated from the latch buckle 15, the pressure rod 17 loses support and falls forward, pressing the optical fiber wound on the left fishing hook 11 and the right fishing hook 12. When the weight of the wound optical fiber is heavy, the outer tube 1 will be pulled downward to stagger the inner leakage hole 10 and the outer leakage hole 9. The drilling fluid flow and pressure parameters in the continuous oil pipe are used to judge that the optical fiber has been wound on the left fishing hook 11 and the right fishing hook 12. The distributed logging optical fiber salvage device is lifted and taken out from the wellbore to complete the optical fiber salvage.

[0025] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A distributed logging optical fiber fishing device, characterized in that The utility model comprises an outer cylinder, an inner cylinder, an end cover, a connecting sleeve, a ball, a limit spring and a salvaging device. A flow channel opening upward is provided in the middle of the inner cylinder, a mounting platform is integrally provided at the lower end of the inner cylinder, an outer cylinder is sleeved on the outer side of the lower part of the inner cylinder, a limit spring is connected between the lower side of the outer cylinder and the upper side of the mounting platform, at least two external leakage flow holes are evenly distributed in the middle of the outer cylinder, the external leakage flow holes form an angle of 45 degrees with the axial direction, an internal leakage flow hole is provided on the inner cylinder corresponding to the position of each external leakage flow hole, the angle of the internal leakage flow hole is consistent with the angle of the external leakage flow hole, the internal leakage flow hole is connected with the flow channel, and the internal leakage flow hole is connected with the external leakage flow hole, a connecting groove is provided on the outer side of the upper end of the inner cylinder, a connecting sleeve sleeved on the inner cylinder is provided in the connecting groove, a thread is provided on the outer side of the connecting sleeve, an end cover connected with the inner cylinder thread is provided on the upper side of the connecting sleeve, a mounting groove with openings opposite to each other is provided between the end cover and the connecting sleeve, a ball is provided in the mounting groove, and a salvaging device is provided on the outer side of the outer cylinder.

2. The distributed logging optical fiber fishing device according to claim 1, characterized in that The salvage device comprises a left salvage hook, a right salvage hook and a preload spring. The upper parts of the left salvage hook and the right salvage hook are installed on the outer tube through an articulated shaft. A preload spring is arranged between the left salvage hook and the right salvage hook at a position below the articulated shaft.

3. The distributed logging optical fiber fishing device according to claim 2, characterized in that The salvage device also includes a line-pressing mechanism, which includes a push rod, a pin buckle, a hinge, and a pressure rod. The pin buckle is installed on the outer tube, and a push rod is hinged on the outer side of the upper end of the right salvage hook. The end of the push rod is located in the pin buckle. A hinge is provided on the outer tube corresponding to the position below the push rod, and a pressure rod is installed on the hinge. The push rod can block the pressure rod.

4. The distributed logging optical fiber fishing device according to claim 1, 2 or 3, characterized in that Salvage devices are provided on the front and rear sides of the outer cylinder. The two sets of salvage devices have the same structure and are symmetrically distributed front to back.

5. The distributed logging optical fiber fishing device according to claim 1, 2 or 3, characterized in that A circle of limiting grooves is arranged on the upper side of the mounting platform, and the limiting springs are installed in the limiting grooves.

6. The distributed logging optical fiber fishing device according to claim 4, characterized in that A circle of limiting grooves is arranged on the upper side of the mounting platform, and the limiting springs are installed in the limiting grooves.

7. An optical fiber fishing method using the distributed logging optical fiber fishing device according to any one of claims 3 to 6, characterized in that The method is as follows: the continuous tubing is connected through the thread on the connecting sleeve, and the continuous tubing lowers the distributed logging optical fiber salvage device to the designated position of the wellbore. The drilling fluid enters the flow channel in the inner tube and is discharged from the inner leakage hole and the outer leakage hole in turn, generating a torque rotating around the axis, thereby driving the inner tube and the outer tube to rotate, driving the left salvage hook and the right salvage hook to rotate, and the left salvage hook and the right salvage hook are wound around the optical fiber. The gravity of the optical fiber pushes the lower parts of the left salvage hook and the right salvage hook to approach each other, and the upper part of the right salvage hook drives the push rod to move rightward. After the push rod is separated from the latch buckle, the pressure rod loses support and falls forward, pressing the optical fiber wound on the left salvage hook and the right salvage hook. When the weight of the wound optical fiber is large, the outer tube will be pulled downward to stagger the inner leakage hole and the outer leakage hole. It is judged that the optical fiber has been wound around the left salvage hook and the right salvage hook through the drilling fluid flow and pressure parameters in the continuous tubing, and the distributed logging optical fiber salvage device is lifted and taken out from the wellbore to complete the optical fiber salvage.

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