Optical cable righting structure for logging while drilling and well drilling device

Abstract

The invention provides an optical cable centralizing structure for logging while drilling and a well drilling device. The optical cable centralizing structure comprises a supporting ring, a protective sleeve, a sealing clamp and a pressing piece. The supporting ring comprises an inner ring and an outer ring; a limiting part is arranged at one end of the inner ring, a penetrating groove penetrating through the peripheral wall is formed in the inner ring in the axis direction, and an optical cable can penetrate through the penetrating groove; the outer ring and the inner ring are mutually connected and are coaxial, and the outer ring is anchored on the inner wall of the drill rod; the peripheral wall of the protective sleeve extends from one end to the other end and is provided with a spiral gap, the optical cable is arranged in the protective sleeve through the spiral gap, the protective sleeve is provided with a shaft shoulder, and the protective sleeve is made of an elastic material; the shaft shoulder is sleeved with the sealing clamp, the sealing clamp and the protective sleeve are integrally inserted into the inner ring, and one end of the shaft shoulder abuts against the limiting part; the pressing piece is detachably connected with the inner ring and abuts against the other end of the shaft shoulder. The pressing force is applied to the shaft shoulder through the pressing piece, so that the clamping force of the protective sleeve is increased in the axial direction, the optical cable is clamped and straightened while the optical cable is straightened, and fatigue damage caused by swinging of the optical cable in the drilling process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of logging optical cable protection devices, and in particular to an optical cable straightening structure and a drilling device for logging while drilling. Background Art

[0002] At present, my country's oil and gas exploration and development successor fields are constantly advancing to complex oil and gas fields such as low permeability, unconventional, deep and ultra-deep layers, and deep water, which poses major challenges to the efficiency, safety, and quality of drilling projects. Logging while drilling technology has emerged. In order to solve the problem of low transmission rate of logging while drilling technology, optical cable logging while drilling is an innovative logging technology. Compared with traditional cable logging, optical cable is not easily affected by electromagnetic interference and the signal propagation speed is much higher than that of cable. It can maintain stable signal transmission under complex geological conditions, and the data transmission rate can reach up to GB per second, which can achieve more efficient data transmission.

[0003] Although fiber optic logging while drilling has many technical advantages, the optical cable inside the drill pipe needs to constantly withstand the erosion of downhole mud and the strong vibration environment during drilling, making it difficult to ensure the reliability of the optical cable. These factors directly determine the reception of downhole measurement signals by the ground information processing end. Therefore, the optical cable straightening structure is a key component in optical cable sensing.

[0004] In the prior art, the optical cable straightening structure only provides straightening but cannot provide pre-tightening force for the optical cable. The failure of the optical fiber to be straightened may cause large swings, which may easily lead to the breakage of the optical cable and fail to ensure the reliability of data transmission by the optical cable. Summary of the invention

[0005] In view of this, the present invention proposes an optical cable straightening structure and a drilling device for logging while drilling, so as to solve the technical problems that the optical cable straightening structures proposed in the above background technology can only provide straightening but cannot provide pre-tightening force for the optical cable, the optical fiber cannot be straightened and may cause large swings, which may easily lead to breakage of the optical cable and the reliability of data transmission by the optical cable cannot be ensured.

[0006] The technical solution of the present invention is achieved in this way:

[0007] In a first aspect, the present invention provides an optical cable straightening structure for logging while drilling, comprising a support ring, a protective sleeve, a sealing card and a pressing member, wherein:

[0008] The support ring comprises an inner ring and an outer ring; a stopper is provided at one end of the inner ring, and a penetration groove penetrating the peripheral wall is provided on the inner ring along the axial direction, and the penetration groove allows the optical cable to pass through; the outer ring is connected to the inner ring and is coaxial, and the outer ring is anchored to the inner wall of the drill pipe;

[0009] The peripheral wall of the protective sleeve is provided with a spiral slit extending from one end to the other end, and the optical cable is installed in the protective sleeve through the spiral slit. The protective sleeve is provided with a shoulder, and the protective sleeve is made of elastic material;

[0010] The sealing sleeve is arranged outside the shaft shoulder, and the sealing sleeve and the protective sleeve are integrally inserted into the inner ring, and one end of the shaft shoulder abuts against the limiting portion;

[0011] The pressing piece is detachably connected to the inner ring, and the pressing piece abuts against the other end of the shaft shoulder.

[0012] On the basis of the above technical solution, preferably, it also includes a set screw, the peripheral wall of the outer ring is provided with a plurality of mounting holes in the radial direction, the set screw is threadedly connected to the mounting hole, the two ends of the set screw are respectively an operating end and a connecting end, the operating end is located on one side of the inner wall of the inner ring, and the connecting end protrudes out of the outer wall of the outer ring and abuts against the inner wall of the drill rod.

[0013] On the basis of the above technical solution, preferably, the connecting end is provided with an inner recess.

[0014] On the basis of the above technical solution, preferably, it also includes a connecting screw, the clamping part includes a pressing cap and a gasket, the pressing cap is provided with a first connecting hole, the end face of the inner ring is provided with a second connecting hole, the second connecting hole is a threaded hole, the connecting screw passes through the first connecting hole and is threadedly connected with the second connecting hole; the gasket is sleeved on the protective sleeve and is located between the pressing cap and the end of the shoulder away from the limiting portion.

[0015] On the basis of the above technical solution, preferably, the outer ring at least includes a ring body, and the ring body is provided with a notch allowing the cable to pass through.

[0016] On the basis of the above technical solution, preferably, the outer ring further comprises a sealing block and a connecting piece, the sealing block is movably inserted in the notch, and the connecting piece connects the sealing block and the ring body.

[0017] On the basis of the above technical solution, preferably, a guide surface is provided on the outer wall of the outer ring, the guide surface is in contact with the inner wall of the drill rod, and the guide surface is located at one end of the outer ring close to the bottom of the drill rod.

[0018] On the basis of the above technical solution, preferably, the support ring further includes an intermediate rod, a gap is provided between the outer wall of the inner ring and the inner wall of the outer ring, and the intermediate rod is connected between the inner ring and the outer ring.

[0019] In a second aspect, the present invention provides a drilling device, comprising a drill pipe and an optical cable, and the optical cable straightening structure for logging while drilling described in the first aspect, wherein the outer ring is connected to the inner wall of the drill pipe, and the optical cable is installed in the protective sleeve through the spiral gap.

[0020] On the basis of the above technical solution, preferably, the drill pipe includes a plurality of short sections connected in sequence, and the optical cable righting structure is located at the connection between two adjacent short sections.

[0021] The optical cable straightening structure and drilling device for logging while drilling of the present invention have the following beneficial effects compared with the prior art:

[0022] (1) A spiral slit is provided through the peripheral wall of the protective sleeve extending from one end to the other end, and the optical cable is installed in the protective sleeve through the spiral slit. The protective sleeve is provided with a shoulder, and the protective sleeve is made of elastic material; the outer ring is anchored to the inner wall of the drill pipe, and the sealing sleeve is arranged outside the shoulder and then inserted into the inner ring together, one end of the shoulder abuts against the limiting part, and the clamping member abuts against the other end of the shoulder. The clamping member applies a clamping force to the shoulder, so that the clamping force of the protective sleeve increases in the axial direction, and while the optical cable is straightened, the optical cable is clamped and straightened, thereby reducing fatigue damage caused by the swing of the optical cable during the drilling process;

[0023] (2) The fixing screw is threadedly connected to the mounting hole, and the two ends of the fixing screw are respectively an operating end and a connecting end, the operating end is located on one side of the inner wall of the inner ring, and the connecting end protrudes from the outer wall of the outer ring and abuts against the inner wall of the drill pipe, so as to realize the anchoring of the outer ring and the inner wall of the drill pipe, so that the outer ring is fixed at a specified position of the drill pipe to prevent it from moving under various external forces, thereby providing stable support and fixation for the optical cable straightening structure and improving the stability and reliability of the device;

[0024] (3) The inner concave portion is provided at the connection end to reduce the contact area between the connection end and the inner wall of the drill pipe, thereby increasing the pressure, increasing the ability of the supporting structure to withstand the forces such as tension, torque and pressure during the drilling process, and improving the reliability of the device;

[0025] (4) The connecting screw passes through the first connecting hole and is threadedly connected to the second connecting hole. The gasket is sleeved on the protective sleeve and is located between the pressure cap and the end of the shoulder away from the limiting portion. The pressing force of the shoulder of the protective sleeve can be adjusted by adjusting the depth of the connecting screw screwed into the second connecting hole. Since the shoulder of the protective sleeve is sleeved with a sealing clamp, the shoulder part of the protective sleeve can only shrink inward to clamp the optical cable, thereby increasing the clamping force on the optical cable, ensuring that the optical cable remains in a taut state, and improving the reliability and stability of the device;

[0026] (5) The sealing block is movably inserted into the notch, and the connecting piece connects the sealing block and the ring body. The notch of the ring body facilitates the insertion of the optical cable, and the sealing block fills the ring body into a full circle, thereby improving the overall stability and reliability of the optical cable straightening structure;

[0027] (6) A gap is provided between the outer wall of the inner ring and the inner wall of the outer ring, and the intermediate rod is connected between the inner ring and the outer ring, so that the support ring has a hollow structure, which can provide a larger flow area, reduce the flow resistance of the drilling fluid, reduce the impact and wear of the drilling fluid on the optical cable, reduce the external force on the optical cable, and extend the service life of the optical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0029] Figure 1 A stereoscopic diagram of an optical cable straightening structure for logging while drilling in an embodiment of the present invention;

[0030] Figure 2 is a cross-sectional view of an optical cable straightening structure for logging while drilling in an embodiment of the present invention;

[0031] Figure 3 An exploded view of an optical cable straightening structure for logging while drilling in an embodiment of the present invention;

[0032] Figure 4 is a schematic structural diagram of a support ring in an embodiment of the present invention;

[0033] Figure 5 is a three-dimensional diagram of a protective cover in an embodiment of the present invention;

[0034] Figure 6 is a cross-sectional view of a set screw in an embodiment of the present invention;

[0035] Figure 7 is a schematic structural diagram of a drilling device in an embodiment of the present invention;

[0036] Figure 8 For the present invention Figure 7 A partial enlarged view of part A in the middle.

[0037] Description of reference numerals: 1-support ring, 2-protective sleeve, 3-sealing card, 4-pressing piece, 5-setting screw, 6-connecting screw;

[0038] 100-drill pipe, 101-short section, 1011-connection surface, 200-optical cable;

[0039] 11-inner ring, 111-limiting portion, 112-penetration groove, 113-second connecting hole, 12-outer ring, 121-ring body, 1211-mounting hole, 1212-notch, 1213-first pin hole, 122-sealing block, 1221-second pin hole, 123-connecting piece, 124-guide surface, 13-middle rod;

[0040] 21- spiral gap, 22- shaft shoulder;

[0041] 41-pressing cap, 411-first connecting hole, 42-gasket;

[0042] 51 - operating end, 52 - connecting end, 521 - inner recess. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Reference Figure 1-8 As shown, the first embodiment of the present invention provides an optical cable straightening structure for logging while drilling, comprising a support ring 1, a protective sleeve 2, a sealing card 3 and a pressing member 4, wherein:

[0045] The support ring 1 comprises an inner ring 11 and an outer ring 12; a stopper 111 is provided at one end of the inner ring 11, and a penetration groove 112 penetrating the peripheral wall is provided on the inner ring 11 along the axial direction, the penetration groove 112 extends from the inner wall to the outer wall, and the penetration groove 112 allows the optical cable 200 to pass through; the outer ring 12 is connected to the inner ring 11 and is coaxial, and the outer ring 12 is anchored to the inner wall of the drill pipe 100;

[0046] The peripheral wall of the protective cover 2 is provided with a spiral slit 21 extending from one end to the other end, and the spiral slit 21 is opened from the outer wall to the inner wall, so that the optical cable 200 can be installed in the protective cover 2 through the spiral slit 21. After the optical cable 200 is installed in the protective cover 2, it is straightened. The protective cover 2 is provided with a shoulder 22, and the protective cover 2 is made of elastic material;

[0047] The sealing clamp 3 is sleeved outside the shoulder 22, and the sealing clamp 3 and the protective sleeve 2 are integrally inserted into the inner ring 11, and one end of the shoulder 22 abuts against the limiting portion 111; the sealing clamp 3 is a hollow cylinder with an opening on the outer wall along the axial direction, and the inner diameter of the sealing clamp 3 is slightly larger than the outer diameter of the protective sleeve 2 when it is not compressed. The sealing clamp 3 can be sleeved outside the protective sleeve 2 and can limit the expansion of the protective sleeve 2 toward the outer wall.

[0048] The pressing member 4 is detachably connected to the inner ring 11 , and the pressing member 4 abuts against the other end of the shaft shoulder 22 .

[0049] The optical cable straightening structure for logging while drilling proposed in this embodiment, the optical cable 200 is installed in the protective sleeve 2 through the spiral gap 21, the protective sleeve 2 is provided with a shoulder 22, the protective sleeve 2 is made of elastic material, the outer ring 12 is anchored to the inner wall of the drill pipe 100, the sealing clamp 3 is sleeved outside the shoulder 22 and then inserted into the inner ring 11 together, one end of the shoulder 22 abuts against the limiting portion 111, the clamping member 4 abuts against the other end of the shoulder 22, the clamping member 4 applies a clamping force to the shoulder 22, so that the clamping force of the protective sleeve 2 increases in the axial direction, and while the optical cable 200 is straightened, the optical cable 200 is clamped and straightened, thereby reducing fatigue damage caused by the swing of the optical cable 200 during the drilling process.

[0050] In some embodiments, the optical cable straightening structure further includes a set screw 5, a plurality of mounting holes 1211 are provided on the peripheral wall of the outer ring 12 in the radial direction, the set screw 5 is threadedly connected to the mounting hole 1211, and the two ends of the set screw 5 are respectively an operating end 51 and a connecting end 52, the operating end 51 is located on one side of the inner wall of the inner ring 11, and the connecting end 52 protrudes from the outer wall of the outer ring 12 and abuts against the inner wall of the drill rod 100. The set screw 5 may be a straight columnar structure without a cap end, and the mounting hole 1211 is a threaded hole without a step, so that the aperture of the mounting hole 1211 is small, which can improve the strength of the outer ring 12, and the operating end 51 may be a hexagonal structure, which is convenient for operation in a narrow space. The outer ring 12 is anchored to the inner wall of the drill rod 100 by the connecting end 52 protruding from the outer wall of the outer ring 12 and abutting against the inner wall of the drill rod 100, so that the outer ring 12 is fixed to the designated position of the drill rod 100 to prevent it from moving under various external forces, provide stable support and fixation for the optical cable straightening structure, and improve the stability and reliability of the device. The anchoring effect of the outer ring 12 and the inner wall of the drill rod 100: on the one hand, it firmly fixes the optical cable straightening structure at a specific position like an anchor to prevent it from moving under various external forces, and provide stable support and fixation for the optical cable straightening structure; on the other hand, this anchoring effect can ensure that the optical cable straightening structure maintains the correct position and posture during the working process, so as to effectively play its straightening function. Whether it is to deal with vibration, impact or other dynamic loads, the anchoring effect of the set screw 5 can keep the optical cable straightening structure stable and ensure the normal operation of the equipment.

[0051] In some embodiments, the connecting end 52 is provided with an inner recess 521. By providing the inner recess 521, the contact area between the connecting end 52 and the inner wall of the drill pipe 100 can be reduced, thereby increasing the pressure, increasing the ability of the straightening structure to withstand the forces such as tension, torque and pressure during the drilling process, and improving the reliability of the device.

[0052] In some embodiments, the optical cable straightening structure also includes a connecting screw 6, the clamping member 4 includes a pressing cap 41 and a gasket 42, the pressing cap 41 is provided with a first connecting hole 411, the end face of the inner ring 11 is provided with a second connecting hole 113, the second connecting hole 113 is a threaded hole, the connecting screw 6 passes through the first connecting hole 411 and is threadedly connected to the second connecting hole 113; the gasket 42 is sleeved on the protective cover 2, and is located between the pressing cap 41 and the end of the shoulder 22 away from the limiting portion 111. The gasket 42 is placed in the inner hole of the outer ring 12, one end of the pressure cap 41 is inserted into the outer ring 12 and sleeved on the protective sleeve 2, the pressure cap 41 presses on the gasket 42, and the clamping force on the shoulder 22 can be adjusted by adjusting the depth of the connecting screw 6 screwed into the second connecting hole 113. Since the shoulder 22 of the protective sleeve 2 is sleeved with a sealing card 3 on the outside, the shoulder 22 of the protective sleeve 2 can only shrink inward to clamp the optical cable 200, thereby increasing the clamping force on the optical cable 200, ensuring that the optical cable 200 remains in a taut state, and improving the reliability and stability of the device.

[0053] In some embodiments, the outer ring 12 at least includes a ring body 121, and a notch 1212 for allowing the cable to pass through is provided on the ring body 121. The notch 1212 can facilitate the insertion of the optical cable 200, improve the convenience of assembly, and improve the assembly efficiency.

[0054] In some embodiments, the outer ring 12 further includes a sealing block 122 and a connecting member 123, wherein the sealing block 122 is movably inserted into the notch 1212, and the connecting member 123 connects the sealing block 122 and the ring body 121. The sealing block 122 fills the ring body 121 into a full circle, thereby improving the overall stability and reliability of the optical cable straightening structure. The connecting member 123 can be a pin, and the end faces of the ring body 121 at the notch 1212 are respectively provided with first pin holes 1213 perpendicular to the end faces, and the sealing block 122 is provided with a second pin hole 1221 corresponding to the first pin hole 1213, and the pin passes through the first pin hole 1213 and the second pin hole 1221 to achieve the connection between the sealing block 122 and the ring body 121.

[0055] In some embodiments, a guide surface 124 is provided on the outer wall of the outer ring 12, and the guide surface 124 is in contact with the inner wall of the drill rod 100, and the guide surface 124 is located at one end of the outer ring 12 close to the bottom of the drill rod 100. The guide surface 124 is a conical surface, which is larger at the top and smaller at the bottom. The guide surface 124 is located at one end of the outer ring 12 close to the bottom of the drill rod 100, and the drill rod 100 can have an upward support force on the outer ring 12, so that the outer ring 12 can withstand greater axial tension, further improving the reliability and stability of the device.

[0056] In some embodiments, the support ring 1 further includes an intermediate rod 13, a gap is provided between the outer wall of the inner ring 11 and the inner wall of the outer ring 12, and the intermediate rod 13 is connected between the inner ring 11 and the outer ring 12. By providing a gap between the outer wall of the inner ring 11 and the inner wall of the outer ring 12, the support ring 1 is a hollow structure, which can provide a larger flow area, reduce the flow resistance of the drilling fluid, reduce the impact and wear of the drilling fluid on the optical cable 200, reduce the external force on the optical cable 200, and extend the service life of the optical cable 200.

[0057] The working principle of the optical cable straightening structure for logging while drilling in this embodiment is as follows: the outer ring 12 is anchored to the inner wall of the drill pipe 100, so that the optical cable straightening structure is fixed at a specified position in the drill pipe 100; the optical cable 200 is installed in the protective sleeve 2 through the spiral gap 21, and the protective sleeve 2 is made of elastic material. The sealing clamp 3 is sleeved outside the shoulder 22 and then inserted into the inner ring 11 together, one end of the shoulder 22 abuts against the limiting portion 111, and the clamping member 4 abuts against the other end of the shoulder 22. The clamping member 4 applies a clamping force to the shoulder 22, so that the clamping force of the protective sleeve 2 increases in the axial direction. While straightening the optical cable 200, the optical cable 200 is clamped and straightened, thereby reducing fatigue damage caused by the swing of the optical cable 200 during the drilling process.

[0058] Based on the same concept, the second aspect of the present invention proposes a drilling device, including a drill pipe 100 and an optical cable 200, and the optical cable straightening structure for logging while drilling described in the first aspect of the embodiment, wherein the outer ring 12 is connected to the inner wall of the drill pipe 100, and the optical cable 200 is installed in the protective cover 2 through the spiral gap 21.

[0059] In some embodiments, the drill pipe 100 includes a plurality of short sections 101 connected in sequence, and the optical cable straightening structure is located at the connection between two adjacent short sections 101. The inner wall of the upper end of the short section 101 is provided with a connecting surface 1011, and the connecting surface 1011 is a conical surface. The guide surface 124 abuts against the connecting surface 1011, and the connecting end 52 of the set screw 5 abuts against the inner wall of the drill pipe 100 to achieve anchoring of the outer ring 12 and the inner wall of the drill pipe 100, so that the outer ring 12 is fixed at a designated position of the drill pipe 100 to prevent it from moving under various external forces.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical cable straightening structure for logging while drilling, characterized in that: It includes a support ring, a protective sleeve, a sealing card and a pressing piece, wherein: The support ring comprises an inner ring and an outer ring; a stopper is provided at one end of the inner ring, and a penetration groove penetrating the peripheral wall is provided on the inner ring along the axial direction, and the penetration groove allows the optical cable to pass through; the outer ring is connected to the inner ring and is coaxial, and the outer ring is anchored to the inner wall of the drill pipe; The peripheral wall of the protective sleeve is provided with a spiral slit extending from one end to the other end, and the optical cable is installed in the protective sleeve through the spiral slit. The protective sleeve is provided with a shoulder, and the protective sleeve is made of elastic material; The sealing sleeve is arranged outside the shaft shoulder, and the sealing sleeve and the protective sleeve are integrally inserted into the inner ring, and one end of the shaft shoulder abuts against the limiting portion; The pressing piece is detachably connected to the inner ring, and the pressing piece abuts against the other end of the shaft shoulder.

2. The optical cable straightening structure for logging while drilling according to claim 1, characterized in that: It also includes a locking screw, wherein the peripheral wall of the outer ring is provided with a plurality of mounting holes in the radial direction, the locking screw is threadedly connected to the mounting hole, and the two ends of the locking screw are respectively an operating end and a connecting end, the operating end is located on one side of the inner wall of the inner ring, and the connecting end protrudes out of the outer wall of the outer ring and abuts against the inner wall of the drill rod.

3. The optical cable straightening structure for logging while drilling according to claim 2, characterized in that: The connecting end is provided with an inner recess.

4. The optical cable straightening structure for logging while drilling according to claim 1, characterized in that: It also includes a connecting screw, and the clamping part includes a pressing cap and a gasket. The pressing cap is provided with a first connecting hole, and the end face of the inner ring is provided with a second connecting hole. The second connecting hole is a threaded hole, and the connecting screw passes through the first connecting hole and is threadedly connected to the second connecting hole. The gasket is sleeved on the protective sleeve and is located between the pressing cap and an end of the shaft shoulder away from the limiting portion.

5. The optical cable straightening structure for logging while drilling according to claim 1, characterized in that: The outer ring at least comprises a ring body, and a notch is provided on the ring body for allowing the cable to pass through.

6. The optical cable straightening structure for logging while drilling according to claim 5, characterized in that: The outer ring further comprises a sealing block and a connecting piece. The sealing block is movably inserted into the notch, and the connecting piece connects the sealing block and the ring body.

7. The optical cable straightening structure for logging while drilling according to claim 1, characterized in that: A guide surface is provided on the outer wall of the outer ring, and the guide surface is in contact with the inner wall of the drill rod. The guide surface is located at one end of the outer ring close to the bottom of the drill rod.

8. The optical cable straightening structure for logging while drilling according to claim 1, characterized in that: The support ring further comprises an intermediate rod, a gap is provided between the outer wall of the inner ring and the inner wall of the outer ring, and the intermediate rod is connected between the inner ring and the outer ring.

9. A drilling device, characterized in that: It comprises a drill pipe and an optical cable, and an optical cable straightening structure for logging while drilling according to any one of claims 1 to 8, wherein the outer ring is connected to the inner wall of the drill pipe, and the optical cable is installed in the protective sleeve through the spiral gap.

10. The drilling device according to claim 9, characterized in that: The drill pipe comprises a plurality of short sections connected in sequence, and the optical cable straightening structure is located at the connection between two adjacent short sections.

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