Distributed well logging fiber fishing device and fiber fishing method

Abstract

The application relates to the technical field of optical fiber fishing, and is a distributed well logging optical fiber fishing device and an optical fiber fishing method. The former comprises an outer cylinder, an inner cylinder, an end cover, a connecting sleeve, a ball, a limiting spring and a fishing device. The inner cylinder is provided with an upwardly-open flow channel in the middle part, and is integrally provided with a mounting table at the lower end. The outer cylinder is sleeved on the outer side of the lower part of the inner cylinder. The limiting spring is connected between the lower side of the outer cylinder and the upper side of the mounting table. The outer cylinder is uniformly provided with at least two outer leakage holes, and the outer leakage holes are at an angle of 45 degrees with the axial direction. The inner cylinder is provided with an inner leakage hole corresponding to the position of each outer leakage hole. The application has reasonable and compact structure and is convenient to use. The fishing device is arranged to fish the optical fiber. The winding condition of the optical fiber is judged according to the connection condition of the leakage holes, the reliable winding of the optical fiber is ensured, and the reliability of the fishing optical fiber is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber fishing, and is a distributed logging optical fiber fishing device and an optical fiber fishing method. BACKGROUND

[0002] Optical fibers are increasingly used in logging processes. Due to the small diameter and relatively poor load-bearing capacity of the optical fibers, as the downhole depth gradually increases in the logging process, the load on the optical fibers gradually increases, and under the combined action of other additional loads, the weak parts of the optical fibers are prone to break 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 cost, the optical fiber that has fallen into the wellbore needs to be fished up in time. SUMMARY

[0003] The present application provides a distributed logging optical fiber fishing device and an optical fiber fishing method, which overcomes the shortcomings of the prior art and effectively solves the problem of inconvenience in fishing the optical fiber that has fallen into the wellbore and affecting the operation.

[0004] One of the technical solutions of the present application is realized by the following measures: a distributed logging optical fiber fishing device, comprising an outer cylinder, an inner cylinder, an end cover, a connecting sleeve, a ball, a limiting spring, and a fishing device, an upward open flow channel is arranged in the middle of the inner cylinder, an installation table is integrally arranged at the lower end of the inner cylinder, the outer cylinder is sleeved on the outer side of the lower part of the inner cylinder, the limiting spring is connected between the lower side of the outer cylinder and the upper side of the installation table, at least two outer leakage holes are uniformly arranged in the middle of the outer cylinder, the outer leakage holes are at an angle of 45 degrees with the axial direction, an inner leakage hole is arranged on the inner cylinder corresponding to the position of each outer leakage hole, the angle of the inner leakage hole is consistent with the angle of the outer leakage hole, the inner leakage hole is in communication with the flow channel, the inner leakage hole is in communication with the outer leakage hole, a connecting groove is arranged on the outer side of the upper end of the inner cylinder, the connecting sleeve is sleeved on the inner cylinder in the connecting groove, threads are arranged on the outer side of the connecting sleeve, the end cover is threadedly connected with the inner cylinder on the upper side of the connecting sleeve, an installation groove with opposite openings is arranged between the end cover and the connecting sleeve, the ball is arranged in the installation groove, and the fishing device is arranged on the outer side of the outer cylinder.

[0005] The following is a further optimization or / and improvement of the above-mentioned technical solutions of the application:

[0006] The above-mentioned fishing device can comprise a left fishing hook, a right fishing hook, and a pre-tightening spring, the upper parts of the left fishing hook and the right fishing hook are installed on the outer cylinder through a hinge shaft, and the pre-tightening spring is arranged between the left fishing hook and the right fishing hook corresponding to the position below the hinge shaft.

[0007] The fishing device can further comprise a wire pressing mechanism, the wire pressing mechanism comprising a push rod, a latch, a hinge, a pressing rod, the latch being mounted on the outer cylinder, the push rod being hingedly connected to the outer side of the upper end of the right fishing hook, the end of the push rod being located in the latch, the hinge being arranged on the outer cylinder corresponding to the position below the push rod, the pressing rod being mounted on the hinge, and the push rod being capable of blocking the pressing rod.

[0008] The fishing device can be arranged on the front side and the rear side of the outer cylinder, and the two groups of fishing devices are of the same structure and are symmetrically arranged.

[0009] A limiting groove can be arranged on the upper side of the mounting table, and the limiting spring is mounted in the limiting groove.

[0010] The second technical scheme of the present application is realized by the following measures: a method for fishing an optical fiber, the method being performed as follows: the coiled tubing is connected through the threads on the connecting sleeve, the coiled tubing lowers the distributed logging optical fiber fishing device to a specified position in the wellbore, the drilling fluid enters the flow channel in the inner cylinder, is discharged from the inner and outer flow discharge holes in sequence, and generates a torque couple rotating around the shaft, thereby driving the inner and outer cylinders to rotate, driving the left and right fishing hooks to rotate, winding the optical fiber with the left and right fishing hooks, and the gravity of the optical fiber pushing the lower parts of the left and right fishing hooks to be close to each other, the upper part of the right fishing hook driving the push rod to move to the right, the push rod being separated from the latch, the pressing rod losing support and falling forward, and pressing the optical fiber wound on the left and right fishing hooks, when the wound optical fiber is heavy, the outer cylinder is moved downward, the inner and outer flow discharge holes are staggered, the drilling fluid flow and pressure parameters in the coiled tubing are used to determine that the optical fiber has been wound on the left and right fishing hooks, the distributed logging optical fiber fishing device is lifted to be taken out of the wellbore, and the fishing of the optical fiber is completed.

[0011] The present application has reasonable and compact structure, and is convenient to use, the optical fiber is fished through the fishing device, the winding condition of the optical fiber is determined through the connection condition of the flow discharge holes, the reliable winding of the optical fiber is ensured, and the reliability of the fishing of the optical fiber is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0012] The present application has reasonable and compact structure, and is convenient to use, the optical fiber is fished through the fishing device, the winding condition of the optical fiber is determined through the connection condition of the flow discharge holes, the reliable winding of the optical fiber is ensured, and the reliability of the fishing of the optical fiber is ensured. Figure 1 It is a schematic view of the front view and partial section structure of the embodiment of the present application.

[0013] The present application has reasonable and compact structure, and is convenient to use, the optical fiber is fished through the fishing device, the winding condition of the optical fiber is determined through the connection condition of the flow discharge holes, the reliable winding of the optical fiber is ensured, and the reliability of the fishing of the optical fiber is ensured. Figure 2 It is a schematic view of the front view and partial section structure of the embodiment of the present application. Figure 1 It is a schematic view of the front view and partial section structure of the embodiment of the present application.

[0014] The codes in the drawings are as follows: 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 limiting spring, 7 is a flow channel, 8 is a mounting table, 9 is an outer flow discharge hole, 10 is an inner flow discharge hole, 11 is a left fishing hook, 12 is a right fishing hook, 13 is a pre-tightening spring, 14 is a push rod, 15 is a latch, 16 is a hinge, 17 is a pressing rod, and 18 is a limiting groove. DETAILED DESCRIPTION

[0015] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0016] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0017] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0018] Example 1: As shown in the attached document Figure 1 , 2 As shown, the distributed logging fiber optic retrieval device includes an outer cylinder 1, an inner cylinder 2, an end cap 3, a connecting sleeve 4, ball bearings 5, a limiting spring 6, and a retrieval device. The inner cylinder 2 has an upward-opening flow channel 7 in its middle. An installation platform 8 is integrally provided at the lower end of the inner cylinder 2. The outer cylinder 1 is fitted onto the outer side of the lower part of the inner cylinder 2. A limiting spring 6 connects the lower side of the outer cylinder 1 to the upper side of the installation platform 8. At least two external vent holes 9 are evenly distributed in the middle of the outer cylinder 1. The external vent holes 9 form a 45-degree angle with the axial direction. Corresponding to the position of each external vent hole 9, the inner cylinder 2... All are provided with an inner vent hole 10, the angle of which is the same as that of the outer vent hole 9. The inner vent hole 10 is connected to the flow channel 7 and the inner vent hole 10 is connected to the outer vent hole 9. The upper outer side of the inner cylinder 2 is provided with a connecting groove, and a connecting sleeve 4 is provided in the connecting groove and fitted on the inner cylinder 2. The outer side of the connecting sleeve 4 is provided with a thread, and the upper side of the connecting sleeve 4 is provided with an end cap 3 that is threaded together with the inner cylinder 2. There is an installation groove with an opening opposite to the end cap 3 and the connecting sleeve 4. A ball bearing 5 is provided in the installation groove. A retrieval device is provided on the outer side of the outer cylinder 1.

[0019] Four external vent holes 9 and four internal vent holes 10 are provided as needed. The connecting sleeve 4 is threaded to the coiled tubing. With the coiled tubing stationary, the inner cylinder 2 and outer cylinder 1 can rotate relative to the coiled tubing under the action of a circumferential torque. The invention is placed at a designated position in the wellbore through the coiled tubing. Drilling fluid enters the flow channel 7 in the inner cylinder 2 and is discharged sequentially from the internal vent holes 10 and external vent holes 9. Since the vent holes are at a 45-degree angle, a torque is generated around the axis, thereby driving the inner cylinder 2 and outer cylinder 1 to rotate, causing the retrieval device to wind the optical fiber. When the weight of the optical fiber is sufficient, it will pull the outer cylinder 1 downward, thereby causing the internal vent holes 10 and external vent holes 9 to be misaligned. The drilling fluid parameters in the coiled tubing 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 to a sufficient extent, and the coiled tubing is pulled up, thereby retrieving the optical fiber from the bottom of the well. It has high reliability, large load-bearing capacity, can judge the optical fiber winding situation, and is easy to maintain.

[0020] The distributed well logging fiber fishing device can be further optimized or improved according to actual needs.

[0021] Embodiment 2: as shown in the accompanying Figure 1 , 2 , the fishing device comprises a left fishing hook 11, a right fishing hook 12 and a pre-tightening spring 13, the upper parts of the left fishing hook 11 and the right fishing hook 12 are installed on the outer cylinder 1 through a hinged shaft, and the pre-tightening spring 13 is arranged between the left fishing hook 11 and the right fishing hook 12 below the corresponding hinged shaft.

[0022] The left fishing hook 11 and the right fishing hook 12 are arranged to wind the fiber, and the pre-tightening spring 13 is arranged to keep a certain angle between the left fishing hook 11 and the right fishing hook 12, so as to facilitate the action of the line pressing mechanism.

[0023] Embodiment 3: as shown in the accompanying Figure 1 , 2 , the fishing device further comprises a line pressing mechanism, the line pressing mechanism comprises a push rod 14, a latch 15, a hinge 16 and a pressing rod 17, the latch 15 is installed on the outer cylinder 1, the push rod 14 is hingedly connected to the outer side of the upper end of the right fishing hook 12, the end of the push rod 14 is located in the latch 15, the hinge 16 is arranged on the outer cylinder 1 below the corresponding position of the push rod 14, the pressing rod 17 is installed on the hinge 16, and the push rod 14 can block the pressing rod 17.

[0024] When the fiber is pulled down by its weight, the left fishing hook 11 and the right fishing hook 12 move close to each other, the upper end of the right fishing hook 12 moves to the right, the push rod 14 moves to the right and comes out of the latch 15, so that the front part of the pressing rod 17 is not blocked, and the pressing rod 17 falls forward to press the wound fiber, thereby avoiding the fiber from loosening and falling off.

[0025] Embodiment 4: as shown in the accompanying Figure 1 , 2 , the fishing device is arranged on the front side and the rear side of the outer cylinder 1, and the two groups of fishing devices are the same in structure and are distributed in front and back symmetry. The arrangement of the two groups of fishing devices makes the inner cylinder 2 and the outer cylinder 1 bear balanced forces, and the service life is longer.

[0026] Embodiment 5: as shown in the accompanying Figure 1 , a limiting groove 18 is arranged on the upper side of the mounting table 8, and the limiting spring 6 is installed in the limiting groove 18. The limiting groove 18 is arranged to limit the position of the limiting spring 6.

[0027] Embodiment 6: as shown in the accompanying Figure 1 , 2As shown, the fiber fishing method is carried out in the following way: the coiled tubing is connected through the thread on the connecting sleeve 4, the coiled tubing lowers the distributed logging fiber fishing device to the designated position in the wellbore, the drilling fluid enters the flow channel 7 in the inner cylinder 2, is discharged from the inner and outer relief holes 10 and 9 in turn, generates a torque couple rotating around the shaft, thereby driving the inner cylinder 2 and the outer cylinder 1 to rotate, driving the left fishing hook 11 and the right fishing hook 12 to rotate, the left fishing hook 11 and the right fishing hook 12 winding the fiber, the gravity of the fiber pushing the lower parts of the left fishing hook 11 and the right fishing hook 12 to close, the upper part of the right fishing hook 12 driving the push rod 14 to move right, the push rod 14 being separated from the bolt buckle 15, the pressing rod 17 then losing support and falling forward, pressing the fiber wound on the left fishing hook 11 and the right fishing hook 12, when the wound fiber weight is larger, pulling the outer cylinder 1 to move downward, making the inner and outer relief holes 10 and 9 staggered, judging that the fiber has been wound on the left fishing hook 11 and the right fishing hook 12 through the drilling fluid flow and pressure parameters in the coiled tubing, lifting the distributed logging fiber fishing device to take it out from the wellbore, and completing the fiber fishing.

[0028] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A distributed logging fiber fishing device, characterized by The device comprises an outer cylinder, an inner cylinder, an end cover, a connecting sleeve, a ball, a limiting spring and a fishing device, the inner cylinder is provided with an upward open flow channel in the middle, the lower end of the inner cylinder is integrally provided with a mounting table, the outer cylinder is sleeved on the outer side of the lower part of the inner cylinder, the limiting spring is connected between the lower side of the outer cylinder and the upper side of the mounting table, the middle part of the outer cylinder is uniformly provided with at least two outer leakage holes, the outer leakage holes are at an angle of 45 degrees with the axial direction, the inner cylinder is provided with an inner leakage hole corresponding to the position of each outer leakage hole, the angle of the inner leakage hole is consistent with that of the outer leakage hole, the inner leakage hole is in communication with the flow channel, the inner leakage hole is in communication with the outer leakage hole, the outer side of the upper end of the inner cylinder is provided with a connecting groove, the connecting sleeve is sleeved on the inner cylinder and arranged in the connecting groove, the outer side of the connecting sleeve is provided with a thread, the upper side of the connecting sleeve is provided with the end cover which is threadedly connected with the inner cylinder, the end cover and the connecting sleeve are provided with an installation groove with an opening opposite to each other between them, the ball is arranged in the installation groove, and the outer side of the outer cylinder is provided with the fishing device. The fishing device comprises a left fishing hook, a right fishing hook and a pre-tightening spring, the upper parts of the left fishing hook and the right fishing hook are installed on the outer cylinder through a hinge shaft, and the pre-tightening spring is arranged between the left fishing hook and the right fishing hook below the hinge shaft. The device is placed at a designated position in the wellbore, drilling fluid enters the flow channel in the inner cylinder, and is discharged from the inner leakage hole and the outer leakage hole in turn, because the leakage holes are at an angle, a torque couple around the shaft is generated, thereby driving the inner cylinder and the outer cylinder to rotate, so that the fishing device winds the optical fiber, and when the weight of the optical fiber is sufficient, the outer cylinder is pulled downward, so that the inner leakage hole and the outer leakage hole are staggered.

2. The distributed logging fiber fishing device of claim 1, wherein The fishing device further comprises a wire pressing mechanism, the wire pressing mechanism comprises a push rod, a latch, a hinge and a pressing rod, the latch is installed on the outer cylinder, the push rod is hingedly arranged on the outer side of the upper end of the right fishing hook, the end of the push rod is located in the latch, the hinge is arranged on the outer cylinder below the push rod, and the pressing rod is installed on the hinge, and the push rod can block the pressing rod.

3. The distributed logging fiber fishing device of claim 1 or 2, wherein The outer cylinder is provided with the fishing device on the front side and the rear side, and the two groups of fishing devices are the same in structure and are symmetrically distributed in front and back.

4. The distributed logging fiber fishing device of claim 1 or 2, wherein The upper side of the mounting table is provided with a limiting groove, and the limiting spring is arranged in the limiting groove.

5. The distributed logging fiber fishing device of claim 3, wherein The upper side of the mounting table is provided with a limiting groove, and the limiting spring is arranged in the limiting groove.

6. A method of fishing an optical fiber using the distributed logging fiber fishing device according to any one of claims 2 to 5, characterized in that The device is placed at a designated position in the wellbore, drilling fluid enters the flow channel in the inner cylinder, and is discharged from the inner leakage hole and the outer leakage hole in turn, because the leakage holes are at an angle, a torque couple around the shaft is generated, thereby driving the inner cylinder and the outer cylinder to rotate, so that the fishing device winds the optical fiber, and when the weight of the optical fiber is sufficient, the outer cylinder is pulled downward, so that the inner leakage hole and the outer leakage hole are staggered. The device is placed at a designated position in the wellbore, drilling fluid enters the flow channel in the inner cylinder, and is discharged from the inner leakage hole and the outer leakage hole in turn, because the leakage holes are at an angle, a torque couple around the shaft is generated, thereby driving the inner cylinder and the outer cylinder to rotate, so that the fishing device winds the optical fiber, and when the weight of the optical fiber is sufficient, the outer cylinder is pulled downward, so that the inner leakage hole and the outer leakage hole are staggered.

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