Buffer brake structure for paying off logging-while-drilling optical cable

Abstract

The invention provides a buffer brake structure for well logging while drilling optical cable pay-off. The buffer brake structure comprises a bearing, a ring sleeve, a baffle ring, an elastic piece, a pressing piece and a brake assembly. The bearing is mounted on the wire storage rod; the ring sleeve is installed on the outer wall of the bearing and provided with an installation hole in the axis direction. The baffle ring is installed on the wire storage rod and abuts against the end, close to the shaft bottom, of the bearing. The elastic member is installed in the installation hole, and the optical cable passes through the elastic member. The pressing piece sleeves the elastic piece, is connected with the mounting hole and is used for compressing the elastic piece; the brake assembly is installed on the drill rod and used for blocking the optical cable. The elastic piece is compressed by the pressing piece, the elastic piece is stressed and tightened, so that friction force can be provided for the optical cable, the friction force just can provide a buffering effect, the optical cable cannot be damaged due to too large force, the friction force can effectively slow down the lowering speed of the optical cable, and stable transition is achieved. The stacking and knotting problems caused by too fast lowering of the optical cable are prevented, and the safety and efficiency of construction are guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a buffer braking structure for cable laying of logging-while-drilling optical cables. Background Art

[0002] Currently, due to the low communication transmission rate of current logging-while-drilling technologies, fully automated intelligent drilling and completion cannot be achieved. The fiber optic communication technology while drilling is an advanced communication technology used in the oil and gas industry. Because the frequency of its light wave is very high, the optical cable communication has a larger capacity and a wider bandwidth than ordinary optical cable communication, and is suitable for the transmission of high-speed and broadband information; the loss of the optical cable is very small, which can greatly increase the distance of transmission without repeaters. The logging-while-drilling measurement by optical cable sensing mainly completes the transmission of information through the optical cable, so it is particularly important to protect the optical cable. At present, the logging-while-drilling measurement methods adopted in China mainly include two types: wireless logging-while-drilling measurement and wired logging-while-drilling measurement. The wired logging-while-drilling measurement relies on a cable to transmit downhole data, with rapid and intuitive display, and the working face can be continuously displayed, so as to provide reliable and timely directional parameters for directional engineers.

[0003] In the prior art, when the cable laying device pays out the optical cable, the frictional force and restraint force from the surface of the rod body are extremely weak. When the optical cable bears a downward traction force, due to the insufficient frictional resistance, the optical cable often slips rapidly at an uncontrolled speed instead of unfolding smoothly and uniformly along the preset path. This will cause a large amount of the optical cable to accumulate at the bottom of the well in a short time, lacking sufficient buffer and sorting space, and it is very easy for the optical cables to cross, overlap, or even knot with each other. Once this situation occurs, it may cause physical damage to the line and increase the difficulty of subsequent maintenance and repair. Summary of the Invention

[0004] In view of this, the present invention provides a buffer braking structure for cable laying of logging-while-drilling optical cables to solve the technical problems in the above background art that the cable laying is too fast, resulting in the optical cable accumulating at the bottom and then knotting, which seriously affects the construction efficiency and is time-consuming and laborious.

[0005] The technical solution of the present invention is realized as follows:

[0006] The present invention provides a buffer braking structure for cable laying of logging-while-drilling optical cables, including a bearing, a collar, a retaining ring, an elastic member, a pressing member, and a braking assembly, wherein:

[0007] The bearing is installed on the cable storage rod;

[0008] The collar is installed on the outer wall of the bearing, and the collar is provided with a mounting hole along the axial direction;

[0009] The retaining ring is installed on the cable storage rod and abuts against one end of the bearing close to the bottom of the well;

[0010] The elastic member is installed in the installation hole, and the optical cable is threaded through the elastic member;

[0011] The pressing member is sleeved outside the elastic member and connected to the installation hole for compressing the elastic member;

[0012] The braking assembly is installed on the drill pipe for blocking the optical cable.

[0013] Based on the above technical solutions, preferably, the braking assembly includes a piston and a reset member. The drill pipe is provided with a guiding hole along the radial direction, and a positioning portion is arranged in the guiding hole. The piston includes a small-diameter section and a large-diameter section. Both the large-diameter section and the small-diameter section are slidably installed in the guiding hole and are sealed with the guiding hole to form a sealed cavity. The reset member is sleeved on the small-diameter section and abuts against the large-diameter section and the positioning portion at both ends respectively; in the pump-on state, the pressure formed by the pressure difference inside and outside the sealed cavity on the large-diameter section is greater than the supporting force of the reset member, thereby driving the small-diameter section to extend out of the guiding hole.

[0014] Based on the above technical solutions, preferably, the braking assembly further includes a plugging member, and the plugging member is detachably connected to the end of the guiding hole to limit the side of the large-diameter section away from the small-diameter section.

[0015] Based on the above technical solutions, preferably, the braking assembly further includes a first sealing ring, a second sealing ring and a retaining ring; a sealing ring groove is arranged on the large-diameter section, and the first sealing ring is arranged in the sealing ring groove; the second sealing ring is sleeved on the small-diameter section, and the outer wall abuts against the inner wall of the guiding hole; the retaining ring is detachably connected to the installation hole to abut and limit the second sealing ring.

[0016] Based on the above technical solutions, preferably, the installation hole is a stepped hole, a blocking portion is arranged in the installation hole, a positioning shoulder is arranged on the elastic member, one end of the blocking portion abuts against the positioning shoulder, the pressing member abuts against the other end of the positioning shoulder, and the pressing member is threadedly connected to the installation hole.

[0017] Based on the above technical solutions, preferably, the elastic member is made of rubber material, and a wire threading hole is arranged on the elastic member along the axis direction of the bearing, and the optical cable is threaded through the wire threading hole.

[0018] Based on the above technical solutions, preferably, a limiting shoulder is arranged on the outer wall of the wire storage rod, one end of the bearing abuts against the limiting shoulder, and the retaining ring is threadedly connected to the wire storage rod and abuts against the other end of the bearing.

[0019] On the basis of the above technical solution, preferably, one of the wire storage rod and the drill rod is provided with a plug-in slot, and the other is provided with a plug-in block, and the plug-in block is plugged into the plug-in slot;

[0020] It also includes a connecting sleeve, which is respectively connected to the wire storage rod and the drill rod.

[0021] On the basis of the above technical solution, preferably, a connecting thread is provided at one end of the inner wall of the connecting sleeve, and a resistance portion is provided at the other end;

[0022] It also includes an intermediate ring, which is installed on the wire storage rod. The connecting sleeve is fitted onto the intermediate ring. The abutting portion abuts against an end of the intermediate ring away from the drill rod. The connecting thread is connected to the drill rod.

[0023] On the basis of the above technical solution, preferably, one end of the optical cable is located at the end of the storage rod, and the optical cable is spirally lowered.

[0024] Compared with the prior art, the buffer brake structure for laying out the optical cable for logging while drilling of the present invention has the following advantages:

[0025] Beneficial effects:

[0026] (1) The elastic member is compressed by the pressing member, and the elastic member is tightened by force, thereby providing friction to the optical cable. The magnitude of the friction is just right to provide a buffering effect, and the optical cable will not be damaged by excessive force. This friction can effectively slow down the lowering speed of the optical cable, achieve a smooth transition, and prevent the accumulation and knotting of the optical cable caused by lowering it too quickly, thereby ensuring the safety and efficiency of the construction. In addition, the bearing is installed on the storage rod, and the ring sleeve is installed on the outer wall of the bearing. When releasing the cable, the elastic member and the optical cable rotate around the storage rod together, which can offset the rotation of the optical cable itself, prevent the optical cable from being entangled on the storage rod, and achieve normal lowering of the optical cable, ensuring that the lowering process is both stable and smooth.

[0027] (2) When the pump is turned on, the pressure formed by the pressure difference between the large diameter section and the inside and outside of the sealed cavity is greater than the supporting force of the reset member, thereby driving the small diameter section to extend out of the guide hole. When the optical cable hits the extended small diameter section, it will be blocked by it, preventing the optical cable from continuing to move downward, thus achieving a brake on the lowering of the optical cable and preventing the mud from flowing and carrying away the optical cable in the mud when the pump is turned on. This structure has low cost, low energy consumption, saves raw materials and processes, and is easier to operate;

[0028] (3) The blocking member is detachably connected to the end of the guide hole to limit the side of the large diameter section away from the small diameter section, thereby ensuring that the piston will not be accidentally separated from the guide hole, thereby improving the reliability of the device;

[0029] (4) By providing a blocking portion in the installation hole, a positioning shoulder is provided on the elastic member, one end of the blocking portion abuts against the positioning shoulder, the pressing member abuts against the other end of the positioning shoulder, and the pressing member is threadedly connected to the installation hole, the pressing force of the pressing member on the elastic member can be adjusted, so that the friction force provided by the elastic member to the optical cable can just provide a buffering effect, and the force is not too large to damage the optical cable;

[0030] (5) One of the wire storage rod and the drill rod is provided with a plugging groove, and the other is provided with a plugging block, and the plugging block is plugged into the plugging groove; the connecting sleeve is respectively connected to the wire storage rod and the drill rod to realize the connection between the wire storage rod and the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a cross-sectional view of the buffer braking structure for the optical cable pay-off during logging while drilling in the embodiments of the present invention;

[0033] Figure 2 For the present invention Figure 1 Partial enlarged view of part A in;

[0034] Figure 3 For the present invention Figure 1 Partial enlarged view of part B in;

[0035] Figure 4 For the present invention Figure 1 Partial enlarged view of part C in.

[0036] Description of the reference numerals: 1 - bearing, 2 - ring sleeve, 3 - retaining ring, 4 - elastic member, 5 - pressing member, 6 - braking assembly, 7 - connecting sleeve, 8 - intermediate ring;

[0037] 00 - optical cable, 100 - wire storage rod, 101 - limiting shoulder, 102 - plugging block; 200 - drill rod, 201 - guiding hole, 202 - positioning portion, 203 - plugging groove; 300 - sealed cavity;

[0038] 21 - installation hole, 211 - blocking portion;

[0039] 41 - positioning shoulder, 42 - wire threading hole;

[0040] 61 - Piston, 611 - Small - diameter section, 612 - Large - diameter section, 62 - Reset member, 63 - Limit cylinder, 64 - Sealing member, 65 - First sealing ring, 66 - Second sealing ring, 67 - Retaining ring;

[0041] 71 - Connecting thread, 72 - Contact portion. Specific embodiments

[0042] The following will describe the technical solutions in the embodiments of the present invention clearly and completely in conjunction with 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0043] Refer to Figures 1-4 As shown, in an embodiment of the present invention, a buffer braking structure for wire - laying of logging - while - drilling optical cable is proposed, which includes a bearing 1, a collar 2, a retaining ring 3, an elastic member 4, a pressing member 5 and a braking assembly 6, wherein:

[0044] The bearing 1 is installed on the wire storage rod 100;

[0045] The collar 2 is installed on the outer wall of the bearing 1, and the collar 2 is provided with an installation hole 21 along the axial direction;

[0046] The retaining ring 3 is installed on the wire storage rod 100 and abuts against the end of the bearing 1 close to the bottom of the well; one end of the optical cable 00 is located at the end of the wire storage rod 100, and the optical cable 00 is lowered in a spiral manner;

[0047] The elastic member 4 is installed in the installation hole 21, and the optical cable 00 passes through the elastic member 4; the elastic member 4 will become tight when stressed, thereby increasing the frictional force on the optical cable 00;

[0048] The pressing member 5 is sleeved outside the elastic member 4 and connected to the installation hole 21 for compressing the elastic member 4;

[0049] The braking assembly 6 is installed on the drill pipe 200 for blocking the optical cable 00. The drill pipe 200 and the wire storage rod 100 are connected and coaxial. Since the optical cable 00 is often lowered while rotating during the lowering process, when the optical cable 00 touches the braking assembly 6, it will be blocked, preventing the optical cable 00 from continuing to move downward, realizing the braking of the lowering of the optical cable 00, and preventing the optical cable 00 in the mud from being carried away by the flow of the mud when the pump is turned on.

[0050] The buffer brake structure for releasing the LWD optical cable proposed in this embodiment compresses the elastic member 4 through the clamping member 5, and the elastic member 4 becomes tighter under the force, thereby providing friction force to the optical cable 00, and the magnitude of the friction force is just right to provide a buffering effect, and the optical cable 00 will not be damaged by excessive force. This friction force can effectively slow down the lowering speed of the optical cable 00, achieve a smooth transition, and prevent the problem of accumulation and knotting caused by the optical cable 00 being lowered too quickly, thereby ensuring the safety and efficiency of the construction; in addition, the bearing 1 is installed on the storage rod 100, and the ring sleeve 2 is installed on the outer wall of the bearing 1. When releasing the line, the elastic member 4 and the optical cable 00 are rotated around the storage rod 100 together, which can offset the rotation of the optical cable 00 itself, prevent the optical cable 00 from being entangled on the storage rod 100, and achieve the normal lowering of the optical cable 00, ensuring that the lowering process is both stable and smooth.

[0051] In some embodiments, the brake assembly 6 includes a piston 61 and a reset member 62, the drill rod 200 is provided with a guide hole 201 along the radial direction, and a positioning portion 202 is provided in the guide hole 201, the piston 61 includes a small diameter section 611 and a large diameter section 612, the large diameter section 612 and the small diameter section 611 are both slidably installed in the guide hole 201, and are sealed with the guide hole 201 to form a sealed cavity 300, the reset member 62 is sleeved on the small diameter section 611, and the two ends respectively abut the large diameter section 612 and the positioning portion 202; in the pump-on state, the pressure formed by the pressure difference between the large diameter section 612 inside and outside the sealed cavity 300 is greater than the supporting force of the reset member 62, thereby driving the small diameter section 611 to extend out of the guide hole 201. In the normal non-starting state, the sealed cavity 300 maintains a standard atmospheric pressure environment, and the built-in reset member 62 uses its elastic force to firmly maintain the large diameter section 612 at the maximum volume position of the sealed cavity 300; in the pumping state, the external pressure rises rapidly and acts on the large diameter section 612, forming a significant pressure difference, which is enough to overcome the elastic force of the reset member 62, push the large diameter section 612 to overcome the resistance and move in the direction of compressing the volume of the sealed cavity 300, and drive the small diameter section 611 to extend out of the guide hole 201. The reset member 62 can be a spring.

[0052] In some embodiments, the brake assembly 6 also includes a limiting cylinder 63, which is installed in the guide hole 201 and has one end located at the positioning portion 202. When the pump is turned on, the pressure difference pushes the large diameter section 612 to overcome resistance and move in the direction of compressing the volume of the sealed cavity 300. When the large diameter section 612 contacts the limiting cylinder 63, it cannot move any further. At this time, the small diameter section 611 extends out a distance from one end of the guide hole 201 to limit the movement of the large diameter section 612, thereby preventing the reset member 62 from being compressed excessively and failing, thereby improving reliability.

[0053] In some embodiments, the brake assembly 6 further includes a plugging member 64 which is detachably connected to the end of the guiding hole 201 to limit one side of the large-diameter section 612 away from the small-diameter section 611. By limiting one side of the large-diameter section 612 away from the small-diameter section 611 through the plugging member 64, it is ensured that the piston 61 will not accidentally disengage from the guiding hole 201, improving the reliability of the device.

[0054] In some embodiments, the brake assembly 6 further includes a first sealing ring 65, a second sealing ring 66 and a retaining ring 67; a sealing ring groove is provided on the large-diameter section 612, and the first sealing ring 65 is arranged in the sealing ring groove; the second sealing ring 66 is sleeved on the small-diameter section 611, and the outer wall abuts against the inner wall of the guiding hole 201; the retaining ring 67 is detachably connected to the mounting hole 21 to abut against and limit the second sealing ring 66. By arranging the first sealing ring 65 in the sealing ring groove, the outer wall of the large-diameter section 612 and the inner wall of the guiding hole 201 are sealed. By sleeving the second sealing ring 66 on the small-diameter section 611 and the outer wall abutting against the inner wall of the guiding hole 201, the outer wall of the small-diameter section 611 and the inner wall of the guiding hole 201 are sealed to ensure the sealing performance of the sealed cavity 300. In actual design, in order to improve the sealing performance, the number of the first sealing ring 65 and the second sealing ring 66 can both be set to two or more.

[0055] In some embodiments, the mounting hole 21 is a stepped hole, a blocking portion 211 is provided in the mounting hole 21, a positioning shoulder 41 is provided on the elastic member 4, one end of the blocking portion 211 abuts against the positioning shoulder 41, the pressing member 5 abuts against the other end of the positioning shoulder 41, and the pressing member 5 is threadedly connected to the mounting hole 21. By threadedly connecting the pressing member 5 to the mounting hole 21 and adjusting the depth of the pressing member 5 screwed into the mounting hole 21, the pressing force of the pressing member 5 on the elastic member 4 can be adjusted, so that the frictional force provided by the elastic member 4 to the optical cable 00 can just provide a buffering effect and will not be too large to damage the optical cable 00.

[0056] In some embodiments, the elastic member 4 is made of rubber material, and a wire threading hole 42 is provided in the elastic member 4 along the axial direction of the bearing 1, and the optical cable 00 is threaded through the wire threading hole 42. When the pressing member 5 presses the elastic member 4, the elastic member 4 is tightened by the force, so that the diameter of the wire threading hole 42 becomes smaller, and the inner wall of the wire threading hole 42 exerts a frictional force on the optical cable 00, and the magnitude of the frictional force can just provide a buffering effect and will not be too large to damage the optical cable 00.

[0057] In some embodiments, the outer wall of the storage rod 100 is provided with a limiting shoulder 101, one end of the bearing 1 abuts against the limiting shoulder 101, and the retaining ring 3 is threadedly connected to the storage rod 100 and abuts against the other end of the bearing 1. By abutting one end of the bearing 1 against the limiting shoulder 101 and the retaining ring 3 against the other end of the bearing 1, the position of the bearing 1 is fixed, so that the optical cable 00 can be subjected to friction at a specified position, and the optical cable 00 under the elastic member 4 can be lowered slowly and orderly, preventing the optical cable 00 from being piled up and knotted due to being lowered too quickly.

[0058] In some embodiments, the drill rod 200 is provided with a plug-in slot 203, and the wire storage rod 100 is provided with a plug-in block 102, and the plug-in block 102 is plugged with the plug-in slot 203; the buffer brake structure further includes a connecting sleeve 7, and the connecting sleeve 7 is respectively connected to the wire storage rod 100 and the drill rod 200. Through the plug-in block 102 and the plug-in slot 203, the connecting sleeve 7 is respectively connected to the wire storage rod 100 and the drill rod 200, so as to realize the connection between the wire storage rod 100 and the drill rod 200.

[0059] In other embodiments, the positions of the plug-in block 102 and the plug-in slot 203 may be interchanged.

[0060] In some embodiments, a connecting thread 71 is provided at one end of the inner wall of the connecting sleeve 7, and a resisting portion 72 is provided at the other end; the buffer brake structure further comprises an intermediate ring 8, the intermediate ring 8 is mounted on the wire storage rod 100, the connecting sleeve 7 is covered with the intermediate ring 8, the resisting portion 72 resists the end of the intermediate ring 8 away from the drill rod 200, and the connecting thread 71 is connected to the drill rod 200. By the connecting sleeve 7 being covered with the intermediate ring 8, the end of the intermediate ring 8 away from the drill rod 200 resists the resisting portion 72, and the connecting thread 71 is connected to the drill rod 200, the connection and fixation of the wire storage rod 100 and the drill rod 200 is realized, and the structure is simple and reliable, and is convenient for the operator to operate.

[0061] The working principle of the buffer brake structure for laying out the LWD optical cable in this embodiment is:

[0062] When the pressing member 5 is tightened and screwed into the mounting hole 21, the elastic member 4 is squeezed, and the elastic member 4 is tightened by force, thereby providing friction force to the optical cable 00, which is about 1-3 kg. At this time, when the optical cable 00 is subjected to downward force, due to the existence of buffer force, it will not accumulate due to excessive laying of the cable at one time, which provides the necessary buffer effect for the smooth laying of the optical cable 00, ensuring the safety and efficiency of the construction;

[0063] It is installed on the wire storage rod 100 through the bearing 1, and the collar 2 is installed on the outer wall of the bearing 1. When paying off the wire, the elastic member 4 and the optical cable 00 rotate around the wire storage rod 100 together, which can offset the rotation of the optical cable 00 itself, prevent the optical cable 00 from winding on the wire storage rod 100, realize the normal pay-off of the optical cable 00, and ensure that the pay-off process is stable and smooth.

[0064] In the normal unstarted state, the inside of the sealed cavity 300 maintains an environment of one standard atmospheric pressure. At the same time, the built-in reset member 62 uses its elastic force to firmly hold the large-diameter section 612 at the position with the largest volume of the sealed cavity 300. In the pump-started state, the external pressure rises rapidly and acts on the large-diameter section 612, forming a significant pressure difference. This pressure difference is sufficient to overcome the elastic force of the reset member 62 and push the large-diameter section 612 to move in the direction of compressing the volume of the sealed cavity 300 against the resistance, driving the small-diameter section 611 to extend out of the guiding hole 201.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A buffer brake structure for laying out a logging while drilling optical cable, characterized in that: It includes a bearing, a ring sleeve, a retaining ring, an elastic member, a pressing member and a brake assembly, wherein: The bearing is mounted on the wire storage rod; The ring sleeve is installed on the outer wall of the bearing, and the ring sleeve is provided with a mounting hole along the axial direction; The retaining ring is installed on the wire storage rod and abuts against the end of the bearing close to the bottom of the well; The elastic member is installed in the installation hole, and the optical cable is passed through the elastic member; The pressing piece is sleeved outside the elastic piece and connected to the mounting hole, and is used to compress the elastic piece; The brake assembly is installed on the drill rod and is used to block the optical cable.

2. The buffer brake structure for laying out the LWD optical cable according to claim 1, characterized in that: The brake assembly includes a piston and a reset member, the drill rod is provided with a guide hole in the radial direction, a positioning portion is provided in the guide hole, the piston includes a small diameter section and a large diameter section, the large diameter section and the small diameter section are both slidably installed in the guide hole, and are sealed with the guide hole to form a sealed cavity, the reset member is sleeved on the small diameter section, and the two ends thereof respectively abut against the large diameter section and the positioning portion; In the pump-on state, the pressure formed by the pressure difference between the large-diameter section and the inside and outside of the sealed cavity is greater than the supporting force of the reset member, thereby driving the small-diameter section to extend out of the guide hole.

3. The buffer brake structure for laying out the LWD optical cable according to claim 2, characterized in that: The brake assembly further comprises a blocking piece, which is detachably connected to the end of the guide hole to limit the side of the large diameter section away from the small diameter section.

4. The buffer brake structure for laying out the LWD optical cable according to claim 3, characterized in that: The brake assembly also includes a first sealing ring, a second sealing ring and a retaining ring; the large diameter section is provided with a sealing ring groove, and the first sealing ring is arranged in the sealing ring groove; the second sealing ring is sleeved on the small diameter section, and the outer wall abuts against the inner wall of the guide hole; the retaining ring is detachably connected to the mounting hole to abut and limit the second sealing ring.

5. The buffer brake structure for laying out the LWD optical cable according to claim 1, characterized in that: The mounting hole is a stepped hole, a blocking portion is provided in the mounting hole, a positioning shoulder is provided on the elastic member, the blocking portion abuts against one end of the positioning shoulder, the clamping member abuts against the other end of the positioning shoulder, and the clamping member is threadedly connected to the mounting hole.

6. The buffer brake structure for laying out the LWD optical cable according to claim 5, characterized in that: The elastic member is made of rubber material, and is provided with a threading hole along the axial direction of the bearing, and the optical cable is passed through the threading hole.

7. The buffer brake structure for laying out the LWD optical cable according to claim 1, characterized in that: The outer wall of the wire storage rod is provided with a limiting shoulder, one end of the bearing abuts against the limiting shoulder, and the retaining ring is threadedly connected to the wire storage rod and abuts against the other end of the bearing.

8. The buffer brake structure for laying out the LWD optical cable according to claim 1, characterized in that: The wire storage rod and the drill rod, one of which is provided with a plug-in slot, and the other is provided with a plug-in block, the plug-in block is plugged into the plug-in slot; It also includes a connecting sleeve, which is respectively connected to the wire storage rod and the drill rod.

9. The buffer brake structure for laying out the LWD optical cable according to claim 8, characterized in that: One end of the inner wall of the connecting sleeve is provided with a connecting thread, and the other end is provided with a resisting portion; It also includes an intermediate ring, which is installed on the wire storage rod. The connecting sleeve is fitted onto the intermediate ring. The abutting portion abuts against an end of the intermediate ring away from the drill rod. The connecting thread is connected to the drill rod.

10. The buffer brake structure for laying out a logging while drilling optical cable according to any one of claims 1 to 9, characterized in that: One end of the optical cable is located at the end of the cable storage rod, and the optical cable is spirally lowered.

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