Line bin device for releasing measurement-while-drilling underground optical cable

Abstract

The invention provides a wire bin device for releasing a measurement-while-drilling underground optical cable, and relates to the technical field of measurement-while-drilling, and the wire bin device comprises a wire storage rod and an optical cable; a plurality of independent wire storage cavities are formed in the wire storage rod in the axial direction of the wire storage rod, and the adjacent wire storage cavities are communicated through transition channels. Optical cables are wound in the cable storage cavities in a segmented mode, the winding directions of the optical cables in the adjacent cable storage cavities are opposite, the two ends of each optical cable extend out of the two ends of the cable storage rod respectively, one end of each optical cable is connected with a fishing device and used for being connected with a fishing head in a matched mode, and the other end of each optical cable is used for being connected with measuring equipment. According to the wire bin device for releasing the measurement-while-drilling underground optical cable, the independent wire storage cavities are formed in the wire storage rod, and the design that the optical cables of the adjacent wire storage cavities are reversely wound is adopted, so that passive mechanical optical cable releasing is achieved, and the technical problems that in a traditional scheme, the optical cables are prone to being wound and knotted, and underground power supply is difficult are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of measurement while drilling, and in particular to a wire bin device for releasing downhole optical cables for measurement while drilling. Background Art

[0002] In oil drilling, measurement-while-drilling (MWD) technology is primarily used for real-time transmission of downhole data to improve drilling efficiency and safety. Currently, mainstream MWD systems rely on wireless transmission methods (such as electromagnetic waves or mud pulses). However, due to the complex downhole environment, wireless signals are susceptible to interference, resulting in low communication rates and poor stability, making them incapable of meeting the requirements of high-precision logging and large-scale data transmission.

[0003] To address this issue, some technical solutions have attempted to use fiber optic communication instead of wireless transmission to improve data transmission rate and reliability. However, existing downhole optical cable release devices still have many technical bottlenecks.

[0004] 1. Winding and knotting: The traditional cable silo structure mainly winds the optical cable around the center rod, and uses the center rod to actively rotate the cable. However, during the long-distance release process, the optical cable is prone to winding and knotting due to uneven tension or rotational inertia, affecting the release smoothness; 2. Power supply problem: Since the line bin structure continuously rotates and lowers along with the drill pipe, when the line bin structure is at a deeper position underground, it is difficult to directly supply power to the line bin structure from the ground through cables, resulting in the active line-releasing mechanism being unable to operate reliably. Summary of the Invention

[0005] In view of this, the present application proposes a wire bin device for releasing downhole optical cables for measurement while drilling, which is used to solve the problem in the prior art that the downhole optical cables are easily entangled and knotted during the release process, affecting the release fluency and making it difficult to power supply downhole.

[0006] The technical solution of this application is achieved as follows: The present application provides a downhole optical cable release device for measurement while drilling, comprising: A wire storage rod, wherein a plurality of independent wire storage cavities are provided inside the wire storage rod along its axial direction, and adjacent wire storage cavities are connected through a transition channel; The optical cable is coiled in sections in each storage cavity. The cables in adjacent storage cavities are coiled in opposite directions. The two ends of the optical cable extend out of the two ends of the storage rod respectively. One end of the optical cable is connected to a salvage device for connecting with a salvage head, and the other end of the optical cable is used to connect with the measuring equipment.

[0007] On the basis of the above technical solution, preferably, the wire storage rod includes two symmetrically arranged half shells, the two half shells are fixedly connected to each other, and the inner wall of the shell is provided with a plurality of semicircular partitions at equal intervals along its axial direction. The partitions divide the inner cavity of the shell into a plurality of wire storage cavities, and a through hole is provided in the center of the partition, and the through holes of the two half shells are connected to form a transition channel.

[0008] Based on the above technical solution, preferably, the inner diameter of the transition channel is larger than the diameter of the optical cable and smaller than 2 times the diameter of the optical cable.

[0009] On the basis of the above technical solution, preferably, a guide flaring structure is provided on a side of the partition facing the measuring device, and the cone angle of the guide flaring structure is 5°-20°.

[0010] On the basis of the above technical solution, preferably, both ends of the shell are respectively provided with connecting structures that cooperate with each other, a plurality of wire storage rods are provided, and the plurality of wire storage rods are connected end to end through the connecting structures, and two symmetrically distributed clips are provided at the connection between adjacent wire storage rods, and the clips are fastened and covered on the outside of the connecting structure by bolts.

[0011] On the basis of the above technical solution, preferably, the connecting structure includes a first connecting part and a second connecting part that cooperate with each other, and the axis centers of the first connecting part and the second connecting part are both provided with wire threading holes connected to the wire storage cavity, and the docking surfaces of the first connecting part and the second connecting part are provided with anti-rotation structures that cooperate with each other, and the anti-rotation structure includes a cooperating protrusion and a recessed part.

[0012] On the basis of the above technical solution, preferably, the ends of the first connecting portion and the second connecting portion are both provided with limiting flanges, and the inner side of the clamping member is provided with a limiting groove that matches the limiting flange.

[0013] On the basis of the above technical solution, preferably, a plurality of axially extending positioning strips are evenly distributed on the outer surface of the wire storage rod along the circumferential direction, and the circumscribed circle diameter of the positioning strips matches the inner diameter of the drill collar.

[0014] On the basis of the above technical solution, preferably, the first connecting portion is provided at the lower end of the wire storage rod, the second connecting portion is provided at the upper end of the wire storage rod, and a plurality of wire storage rods are axially connected in series to form the wire bin body; The lower end of the cable bin body is provided with a first docking assembly, including a first connecting member, a first limiting member and a first cylinder. The first connecting member cooperates with the first connecting portion, the first limiting member is covered on the outside of the connection, the first cylinder is threadedly connected to the first limiting member, and the first connecting member and the first cylinder are axially provided with a first lead-in hole penetrating therethrough, for leading the optical cable out to the measuring device; The uppermost end of the wire bin body is provided with a second docking assembly, including a second connecting piece, a second limiting piece and a second cylinder; the second connecting piece cooperates with the second connecting part, the second limiting piece is covered on the outside of the connection, the second cylinder is threadedly connected to the second limiting piece, and the second connecting piece and the second cylinder are axially provided with a second lead-in hole for leading the optical cable out to the salvage device.

[0015] On the basis of the above technical solution, preferably, the end of the optical cable extending out of the first lead-in hole is provided with a first wet joint, the first wet joint is located in the first cylinder, and the first wet joint is used to connect to the measuring equipment; the end of the optical cable extending out of the second lead-in hole is provided with a second wet joint, the second wet joint is located in the second cylinder, and the second wet joint is connected to the salvage device.

[0016] Compared with the prior art, this application has the following beneficial effects: (1) The cable storage device for releasing downhole optical cables for measurement while drilling provided in this application realizes passive mechanical optical cable release by providing multiple independent cable storage cavities in the cable storage rod and adopting a design in which the cables of adjacent cable storage cavities are coiled in reverse. This effectively solves the technical problems of easy tangling and knotting of optical cables and difficulty in downhole power supply in traditional solutions. The device can smoothly release the optical cable by simply pulling it with a fishing head. While ensuring self-balancing of torque during long-distance release, it avoids the need for electric drive and is particularly suitable for measurement while drilling operations in complex deep well environments.

[0017] (2) The split cable storage rod structure formed by snapping together the two halves of the shell, combined with the partition and transition channel, greatly improves the convenience of optical cable installation while ensuring structural strength, and ensures that the optical cable can be released smoothly.

[0018] (3) The inner diameter of the transition channel is larger than the diameter of the optical cable. The fluid downhole enters the storage rod, and the internal and external pressures can be balanced through the transition channel to avoid excessive internal and external pressure difference, which will cause the shell to be deformed.

[0019] (4) By setting the side of the partition facing the measuring equipment as a cone, the normal force generated by the cone will limit the radial displacement of the optical cable. The cone guide ensures a smooth transition of the optical cable, and the mechanical constraint generated by the angle prevents the cable from being tangled and prevents the optical cable section in the storage cavity from being completely pulled out of the transition channel, thus solving the trajectory control and anti-pullout problems during the release of the optical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the cable bin device for releasing downhole optical cables for measurement while drilling disclosed in this application; Figure 2 This is a schematic diagram of the three-dimensional structure of the wire storage rod disclosed in this application; Figure 3 This is a schematic diagram of the three-dimensional structure of the housing disclosed in this application; Figure 4 This is a schematic plan view of the assembly structure of the optical cable disclosed in this application inside the storage rod; Figure 5 This is an exploded schematic diagram of a downhole optical cable release device for measurement while drilling disclosed in this application; Figure 6 A planar cross-sectional view of a downhole optical cable release device for measurement while drilling disclosed in this application; Reference numerals: 1. Wire storage rod; 11. Wire storage cavity; 2. Optical cable; 3. Salvage device; 10. Shell; 101. Partition; 102. Through hole; 1010. Guide flaring structure; 103. First connecting part; 104. Second connecting part; 100. Threading hole; 4. Snap-in component; P1. Protrusion; P2. Recess; T. Limiting flange; 41. Limiting groove; 105. Positioning strip; 5. First docking assembly; 51. First connecting part; 52. First limiting part; 53. First cylinder; X1. First lead-in hole; 6. Second docking assembly; 61. Second connecting part; 62. Second limiting part; 63. Second cylinder; X2. Second lead-in hole; 7. First wet joint; 8. Second wet joint. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0023] like Figure 1 As shown, combined Figure 5 The embodiment of the present application discloses a wire storage device for releasing a downhole optical cable for measurement while drilling, including a wire storage rod 1 and an optical cable 2.

[0024] A plurality of mutually independent cable storage cavities 11 are provided inside the cable storage rod 1 along its axial direction. Adjacent cable storage cavities 11 are connected via transition channels. This structural arrangement facilitates the segmented storage of long-distance optical cables.

[0025] In this embodiment, the optical cable 2 is wound in sections in each storage cavity 11. The winding directions of the optical cables in adjacent storage cavities 11 are opposite. The transition channel ensures that the optical cable transitions smoothly between the storage cavities 11. For example, the first storage cavity 11 is wound in a clockwise direction, while the second storage cavity 11 is wound in a counterclockwise direction. The design of the opposite winding of adjacent storage cavities 11 makes the torque generated when the optical cable is released cancel each other out (e.g. Figure 4 As shown in the figure, the problem of entanglement and knotting during long-distance release is fundamentally avoided.

[0026] In this embodiment, the number of line storage cavities 11 can be set according to the required length of the downhole optical cable. Each line storage cavity 11 can be wound around a certain length of optical cable. For example, a single line storage cavity 11 can be wound around 5-20m. The number of line storage cavities 11 can be calculated based on the required total length of the optical cable and can be set according to demand in actual engineering.

[0027] Two ends of the optical cable extend out of the two ends of the storage rod 1 respectively. One end of the optical cable is connected to a salvaging device 3 for connecting with a salvaging head, and the other end of the optical cable is used to connect with a measuring device.

[0028] During the specific implementation process, the line bin device is installed inside the drill collar, and the optical cable extending from the bottom of the line bin device is first connected to the measuring equipment, and then the line bin device and the drill collar are lowered to the bottom of the well as the drill pipe. When the line bin device reaches the bottom of the well, the salvage head is lowered along the inside of the drill pipe so that the salvage head and the salvage device 3 are docked. The salvage device 3 is pulled up by the salvage head, so that the optical cable is pulled out from the storage rod 1 from top to bottom in sections. Since the optical cable is wound in the opposite direction in the storage cavity 11, the optical cable can be smoothly released from the line bin device, and no entanglement or knotting will occur during the release process, and the upper end of the optical cable can be smoothly pulled out of the ground. After the upper end of the optical cable is pulled out of the ground, the salvage device 3 is removed, and the optical cable and the communication equipment can be connected, so that optical communication with the downhole measuring equipment can be established through the optical cable.

[0029] The optical cable can be released section by section by mechanically pulling the fishing head, without relying on the rotation of the storage rod 1 or electric drive. This feature is particularly suitable for deep well environments and solves the problem of underground power supply.

[0030] The cable storage device for releasing downhole optical cables during measurement while drilling (MWD) provided in the present application utilizes a design that provides multiple independent cable storage cavities 11 within a cable storage rod 1 and employs a design where the cables in adjacent storage cavities 11 are coiled in opposite directions. This design achieves passive mechanical cable release, effectively resolving the technical challenges of traditional solutions, such as the tangling and knotting of optical cables and the difficulty in providing power downhole. The device allows for smooth cable release simply by pulling with a fishing head. This ensures torque self-balancing during long-distance release while eliminating the need for electric drive, making it particularly suitable for MWD operations in complex deep well environments.

[0031] In order to enable the optical cable to be installed in sections within the storage rod 1 , this embodiment further provides the following technical solutions.

[0032] Specifically, the wire storage rod 1 includes two symmetrically arranged half shells 10, which are fixedly connected to each other. A plurality of semicircular partitions 101 are provided on the inner wall of the shell 10 at equal intervals along its axial direction. The partitions 101 divide the inner cavity of the shell 10 into a plurality of wire storage cavities 11. A semicircular through hole 102 is provided in the center of the partition 101. The through holes 102 of the two half shells 10 are connected to form a transition channel.

[0033] The split structure simplifies the installation of optical cables: the optical cable can be coiled in the storage cavity 11 of one half of the housing 10 before the other half 10 is closed. The two halves 10 are then bolted together, allowing for easy installation of the optical cable within the storage rod 1. During installation, multiple sections of optical cable, coiled in opposite directions, are installed in the storage cavities 11 of each half of the housing 10. The transition cable between adjacent sections passes through the through-hole 102. Due to the restriction of the partition 101, the coiled optical cable within the storage cavity 11 is axially defined, preventing movement or dislocation and ensuring smooth release of the optical cable.

[0034] In the above embodiment, the material of the housing 10 can be selected from high-strength aluminum alloy, titanium alloy or carbon fiber material.

[0035] The split cable storage rod 1 structure formed by snapping together the two half shells 10, in conjunction with the partition 101 and the transition channel, greatly improves the convenience of optical cable installation while ensuring structural strength, and ensures that the optical cable can be released smoothly.

[0036] In some embodiments, the inner diameter of the transition channel is larger than the diameter of the optical cable and less than 2 times the diameter of the optical cable. With this structural arrangement, the transition channel only allows a single optical cable to pass smoothly, while preventing the optical cable in the storage cavity 11 from being instantly pulled out of the transition channel when the aperture of the transition channel is too large, thereby ensuring that the optical cables in each storage cavity 11 can pass through the transition channel in an orderly manner and be smoothly released.

[0037] It should also be noted that the inner diameter of the transition channel is larger than the diameter of the optical cable. When the fluid downhole enters the storage rod 1, the internal and external pressures can be balanced through the transition channel to avoid excessive internal and external pressure difference, which may cause deformation of the shell 10.

[0038] In some embodiments, a guide flare structure 1010 is provided on the side of the partition 101 facing the measuring device. The cone angle of the guide flare structure 1010 is 5°-20°. With this structural arrangement, the normal force component generated by the cone limits the radial displacement of the optical cable. This conical guidance ensures a smooth transition of the optical cable. The mechanical constraint created by the angle prevents cable tangling and prevents the cable segment within the storage cavity 11 from being completely pulled out of the transition channel. This solves the problems of trajectory control and cable pull-out prevention during cable release.

[0039] In the above embodiment, the angle cannot be set too large, otherwise it will cause the thickness of the partition 101 to increase, occupying the axial space of the wire storage cavity 11.

[0040] The length of the optical cable stored in a single storage rod 1 is limited. In actual engineering, the length of a single storage rod 1 is between 1.5m and 2m. If it is too long, it will be difficult to process and prone to deformation. However, the underground depth is usually between 1000m and 5000m. When long-distance optical cable release is required, a single storage rod 1 is obviously not enough. To this end, this embodiment solves this problem through the following technical solution.

[0041] Specifically, both ends of the shell 10 are respectively provided with connecting structures that cooperate with each other, and multiple wire storage rods 1 are provided. The multiple wire storage rods 1 are connected end to end through the connecting structure, and the connection between adjacent wire storage rods 1 is provided with two symmetrically distributed clips 4, which are fastened and covered on the outside of the connecting structure by bolts.

[0042] With this structural arrangement, two storage rods 1 can be connected axially in series through the connection structure, and the connection structure enables the two storage rods 1 to be axially butted. Two symmetrically arranged clips 4 can be wrapped around the outside of the connection structure and fixed to each other by bolts, thereby preventing two adjacent storage rods 1 from axially separating. In actual drilling projects, the required length of the optical cable is obtained based on the downhole depth, and the number of storage rods 1 is configured based on the known length of the optical cable that can be accommodated by a single storage rod 1. By connecting multiple storage rods 1 in series, the flexible cable length requirements of different well depths can be met, providing a standardized optical cable carrying solution for the measurement while drilling system that can adapt to various working conditions.

[0043] As some embodiments, the connection structure includes a first connection part 103 and a second connection part 104 that cooperate with each other. The first connection part 103 and the second connection part 104 are both provided with a wire threading hole 100 connected to the wire storage cavity 11 at the axis center. The diameter of the first connection part 103 and the second connection part 104 is smaller than the outer diameter of the shell 10. The wire threading hole 100 is used for the optical cable between the two wire storage rods 1 to pass through. The inner diameter of the wire threading hole 100 can be adapted to the inner diameter of the transition channel.

[0044] The mating surfaces of the first connecting portion 103 and the second connecting portion 104 are provided with a mutually cooperating anti-rotation structure, which includes a cooperating protrusion P1 and a recess P2. With this arrangement, when two storage rods 1 need to be docked, it is only necessary to axially dock the first connecting portion 103 of one storage rod 1 with the second connecting portion 104 of the other storage rod 1. At this time, the two connecting portions cooperate with each other through the protrusion P1 and the recess P2, thereby preventing the two storage rods 1 from circumferential rotation after axial docking, ensuring the stability of the entire storage structure.

[0045] It is worth noting that the end face of the first connecting portion 103 is provided with a protrusion P1 and a recessed portion P2, and the end face of the second connecting portion 104 is provided with a recessed portion P2 and a protrusion P1, and the protrusion P1 and the recessed portion P2 are arranged symmetrically with respect to the center. In this way, when the two wire storage rods 1 can be docked through the first connecting portion 103 and the second connecting portion 104, the convex and concave structures cooperate with each other, and the two wire storage rods 1 that have been axially docked do not rotate circumferentially.

[0046] As some embodiments, the ends of the first connecting part 103 and the second connecting part 104 are both provided with a limiting flange T, and the limiting flange T is formed by extending from the outer side of the ends of the first connecting part 103 and the second connecting part 104, and the inner side of the clamping part 4 is provided with a limiting groove 41 that matches the limiting flange T. In this embodiment, the outer diameter of the limiting flange T is smaller than the outer diameter of the shell 10, and the outer diameter of the clamping part 4 is also smaller than the outer diameter of the shell 10. When the two wire storage rods 1 are axially connected through the connecting structure, the two clamping parts 4 are enclosed at the connecting structure. At this time, the limiting groove 41 wraps the limiting flange T. After the two clamping parts 4 are fixedly connected by locking bolts, the two wire storage rods 1 can be firmly axially connected to avoid axial separation of the wire storage rods 1.

[0047] During actual use, the wire bin device disclosed in this embodiment needs to be installed inside the drill collar, which is then connected to the bottom of the drill pipe and lowered to the deep bottom of the well. To this end, this embodiment has a number of axially extending positioning strips 105 evenly distributed along the circumference on the outer surface of the wire storage rod 1, and the circumscribed circle diameter of the positioning strips 105 matches the inner diameter of the drill collar. With this arrangement, after the wire storage rod 1 is docked, it is inserted into the inside of the drill collar, and the outer diameter of the positioning strips 105 and the inner diameter tolerance of the drill collar are well matched, that is, after the entire wire bin device is installed inside the drill collar, the wire storage rod 1 can remain circumferentially and axially fixed to the inside of the drill collar, so that the wire bin device is firmly installed inside the drill collar.

[0048] In order to facilitate the extraction of optical cables from the upper and lower ends of the wire bin device to achieve connection with the salvage device 3 and the detection equipment, this embodiment also adopts the following technical solution.

[0049] Specifically, this embodiment defines the lower end of the wire storage rod 1 as the first connecting part 103, and the upper end of the wire storage rod 1 as the second connecting part 104. Multiple wire storage rods 1 are matched with each other through the first connecting part 103, the second connecting part 104 and the clamping part 4 to form an axial series connection to form a wire bin body.

[0050] The lower end of the cable bin body is provided with a first docking assembly 5, which provides a channel for leading the optical cable out and provides a basis for installing the measuring equipment. Specifically, the first docking assembly 5 includes a first connector 51, a first stopper 52 and a first barrel 53. The first connector 51 cooperates with the first connecting portion 103, the first stopper 52 is covered on the outside of the connection, and the first barrel 53 is threadedly connected to the first stopper 52. The first connector 51 and the first barrel 53 are axially provided with a first lead-in hole X1 for leading the optical cable out to the measuring equipment.

[0051] In this embodiment, the first connecting member 51 is similar to the structure of the second connecting part 104. The first connecting member 51 is installed on the end face of the first connecting part 103, and the two cooperate with each other. The first limiting member 52 is a semicircular sleeve structure. The two first limiting members 52 surround the outside of the connection between the first connecting member 51 and the first connecting part 103. The first connecting member 51 and the first connecting member 51 will not axially disengage inside the two first limiting members 52. The two first limiting members 52 are enclosed to form a circular sleeve structure, and then the first cylinder 53 is sleeved on the outside of the two first limiting members 52. The outside of the first limiting member 52 has an external thread, and the inside of the first cylinder 53 has an internal thread. The two are threadedly connected. The inside of the first cylinder 53 has a retaining plate that resists the first connecting member 51. The retaining plate can limit the axial translation stroke of the first cylinder 53 relative to the thread of the first limiting member 52. The first connector 51 and the first barrel 53 are axially provided with a first lead hole X1 penetrating therethrough. The first lead hole X1 is provided on the support plate of the first barrel 53 for the lower end of the cable to pass through, thereby connecting to the measuring device.

[0052] It is worth noting that, due to the arrangement of the first cylinder 53 , the measuring device can be conveniently connected to the first cylinder 53 . For example, the measuring device can be screwed to the first cylinder 53 .

[0053] A second docking assembly 6 is provided at the uppermost end of the cable bin body, comprising a second connector 61, a second limiting member 62 and a second cylinder 63; the second connector 61 cooperates with the second connecting portion 104, the second limiting member 62 is wrapped around the outside of the connection, the second cylinder 63 is threadedly connected to the second limiting member 62, and the second connector 61 and the second cylinder 63 are axially provided with a second lead-in hole X2 that penetrates therethrough, which is used to lead the optical cable out to the salvage device 3.

[0054] It should be noted that the structure of the second docking assembly 6 is identical to that of the first docking assembly 5, and the installation process is also the same. The only difference is that the optical cable passes through the second lead-in hole X2 to connect to the salvage device 3, and the corresponding second cylinder 63 serves as the installation base of the salvage device 3.

[0055] As some embodiments, a first wet joint 7 is provided at one end of the optical cable extending out of the first lead-in hole X1. The first wet joint 7 is located in the first cylinder 53. The first wet joint 7 is used to connect to the measuring equipment. Specifically, after the first wet joint 7 is connected to the measuring equipment, the measuring equipment can be fixedly connected to the first cylinder 53. In this way, it is ensured that the measuring equipment can be fixed together with the line bin device underground, avoiding the underground fluid from flushing the measuring equipment and pulling out the optical cable.

[0056] A second wet connector 8 is provided at one end of the optical cable extending out of the second lead-in hole X2. The second wet connector 8 is located within the second barrel 63 and is connected to the salvage device 3. In this embodiment, the second wet connector 8 and the salvage device 3 are detachably connected. The salvage device 3 is located above the second wet connector 8. The second barrel 63 provides a foundation for mounting the second wet connector 8 and the salvage device 3. After the line bin device is lowered to the bottom of the well, the salvage head is lowered along the drill pipe to the bottom of the well. The salvage head enters the drill collar and the second barrel 63, and is mechanically docked with the salvage device 3. After the salvage device 3 and the salvage head are docked, the salvage head is lifted by a lifting device. At this time, the salvage device 3 pulls the optical cable upward through the second wet connector 8, and the optical cable segments inside the line bin device are released. After the second wet connector 8 is pulled out of the ground, the salvage device 3 is removed, and the second wet connector 8 can be connected to the communication equipment to establish optical communication with the downhole measurement equipment.

[0057] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A downhole optical cable release device for measurement while drilling, characterized in that: include: A wire storage rod (1), wherein a plurality of mutually independent wire storage cavities (11) are provided inside the wire storage rod (1) along its axial direction, and adjacent wire storage cavities (11) are connected via a transition channel; The optical cable is wound in sections in each storage cavity (11), and the optical cables in adjacent storage cavities (11) are wound in opposite directions. The two ends of the optical cable extend out of the two ends of the storage rod (1), respectively. One end of the optical cable is connected to a salvaging device (3) for connecting with a salvaging head, and the other end of the optical cable is used to connect with a measuring device.

2. The cable bin device for releasing downhole optical cables for measurement while drilling according to claim 1, characterized in that: The wire storage rod (1) comprises two symmetrically arranged half shells (10), the two half shells (10) being matched and fixedly connected to each other, a plurality of semicircular partitions (101) being provided on the inner wall of the shell (10) at equal intervals along its axial direction, the partitions (101) dividing the inner cavity of the shell (10) into a plurality of wire storage cavities (11), a through hole (102) being provided at the center of the partition (101), and the through holes (102) of the two half shells (10) being butted together to form a transition channel.

3. The cable bin device for releasing downhole optical cables for measurement while drilling according to claim 1, characterized in that: The inner diameter of the transition channel is larger than the diameter of the optical cable and smaller than 2 times the diameter of the optical cable.

4. The cable bin device for releasing downhole optical cables for measurement while drilling according to claim 2, characterized in that: A guide expansion structure (1010) is provided on the side of the partition (101) facing the measuring device, and the cone angle of the guide expansion structure (1010) is 5°-20°.

5. The cable bin device for releasing downhole optical cable for measurement while drilling according to claim 2, characterized in that: Both ends of the housing (10) are provided with mutually matching connection structures, a plurality of wire storage rods (1) are provided, and the plurality of wire storage rods (1) are connected end to end via the connection structures, and two symmetrically distributed clamping parts (4) are provided at the connection points of adjacent wire storage rods (1), and the clamping parts (4) are fastened and covered on the outside of the connection structure by bolts.

6. The cable bin device for releasing downhole optical cables for measurement while drilling according to claim 5, characterized in that: The connection structure comprises a first connection part (103) and a second connection part (104) that cooperate with each other. The axis of the first connection part (103) and the second connection part (104) are both provided with a threading hole (100) that is connected to the wire storage cavity (11). The docking surface of the first connection part (103) and the second connection part (104) is provided with a mutually cooperating anti-rotation structure. The anti-rotation structure comprises a cooperating protrusion (P1) and a recessed part (P2).

7. The cable bin device for releasing downhole optical cables for measurement while drilling according to claim 6, characterized in that: The ends of the first connecting portion (103) and the second connecting portion (104) are both provided with limiting flanges (T), and the inner side of the clamping member (4) is provided with limiting grooves (41) that match the limiting flanges (T).

8. The cable bin device for releasing downhole optical cables for measurement while drilling according to claim 1, characterized in that: A plurality of axially extending positioning strips (105) are evenly distributed on the outer surface of the wire storage rod (1) along the circumferential direction, and the circumscribed circle diameter of the positioning strips (105) matches the inner diameter of the drill collar.

9. The cable bin device for releasing downhole optical cables for measurement while drilling according to claim 6, characterized in that: The first connecting portion (103) is arranged at the lower end of the wire storage rod (1), the second connecting portion (104) is arranged at the upper end of the wire storage rod (1), and a plurality of wire storage rods (1) are axially connected in series to form a wire bin body; The lower end of the cable bin body is provided with a first docking assembly (5), comprising a first connecting member (51), a first limiting member (52) and a first cylinder (53), wherein the first connecting member (51) cooperates with the first connecting portion (103), the first limiting member (52) is covered on the outside of the connection, and the first cylinder (53) is threadedly connected to the first limiting member (52), and the first connecting member (51) and the first cylinder (53) are axially provided with a first lead-in hole (X1) penetrating therethrough for leading the optical cable to the measuring device; The uppermost end of the cable bin body is provided with a second docking assembly (6), comprising a second connecting member (61), a second limiting member (62) and a second cylinder (63); the second connecting member (61) cooperates with the second connecting portion (104), the second limiting member (62) is covered on the outside of the connection, the second cylinder (63) is threadedly connected to the second limiting member (62), and the second connecting member (61) and the second cylinder (63) are axially provided with a second lead-in hole (X2) passing through, which is used to lead the optical cable out to the salvage device (3).

10. The cable magazine device for releasing downhole optical cables for measurement while drilling according to claim 9, characterized in that: One end of the optical cable extending out of the first lead hole (X1) is provided with a first wet joint (7), the first wet joint (7) is located in the first cylinder (53), and the first wet joint (7) is used to connect to the measuring equipment; one end of the optical cable extending out of the second lead hole (X2) is provided with a second wet joint (8), the second wet joint (8) is located in the second cylinder (63), and the second wet joint (8) is connected to the salvaging device (3).

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