Measurement-while-drilling underground optical cable wire bin device based on external wire outlet mode

Abstract

The invention provides a measurement-while-drilling underground optical cable bin device based on an external outgoing line mode. The measurement-while-drilling underground optical cable bin device comprises an end cover, a housing, a cable storage rod, a cable lifting head, a first cable drawing head and a second cable drawing head, the end cover and the wire lifting head are detachably mounted at the two ends of the housing respectively; the cable lifting head is used for tensioning and leading out the optical cable; the wire storage rod is installed on the end cover and located in the housing, a plurality of coils and a plurality of check rings are arranged on the wire storage rod in a sleeving and winding mode, one half of an optical cable of each coil is wound clockwise, the other half of the optical cable of each coil is wound anticlockwise, and one check ring is arranged between every two adjacent coils; the first wire drawing head is connected with the end cover and the inner wall of the drill collar; the second wire drawing head is connected with the housing and the inner wall of the drill collar. The wire storage rod and the drill collar move synchronously and do not rotate relatively, so that the optical cable in the middle cannot be twisted off; half of the optical cable of each coil is wound clockwise, and the other half of the optical cable is wound anticlockwise, so that back-twisting of the optical cable during releasing is guaranteed, torsion accumulation is avoided, and the optical cable is further prevented from being twisted off.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a downhole optical cable bin device based on an outgoing line measurement while drilling method. Background Art

[0002] Current measurement-while-drilling (MWD) technology is unable to achieve fully automated intelligent drilling and completion due to its low communication transmission rate. Fiber-optic communication while drilling (FWD) is an advanced communication technology used in the oil and gas industry. Due to its high light frequency, fiber-optic communication has a higher capacity and wider bandwidth than conventional cable communication, making it suitable for high-speed, broadband information transmission. Fiber-optic communication also has minimal loss, significantly increasing the distance of unrelayed transmission.

[0003] In the existing technology, the optical cable is spirally wound on the storage rod of the cable bin structure, and the downhole sensor and external instruments and equipment are connected through the optical cable. The storage rod and the drill collar will rotate relative to each other. When the drill collar rotates, the optical cable will be subjected to a large torque and be broken; and when the optical cable is released, the rotation of the storage rod will generate a large torque accumulation, further increasing the possibility of the optical cable being broken. Summary of the Invention

[0004] In view of this, the present invention proposes a downhole optical cable magazine device for measurement while drilling based on an external line method to solve the technical problems proposed in the above background technology that the storage rod and the drill collar will rotate relative to each other, and when the drill collar rotates, the optical cable will be subjected to a large torque and be broken; and when the optical cable is released, the rotation of the storage rod will generate a large torque accumulation, further increasing the possibility of the optical cable being broken.

[0005] The technical solution of the present invention is achieved as follows: The present invention provides a downhole optical cable silo device for measurement while drilling based on an outgoing line mode, comprising an end cover, a cover shell, a cable storage rod, a cable lifting head, a first cable drawing head and a second cable drawing head, wherein: The end cover and the thread lifting head are detachably mounted on both ends of the cover shell; The cable lifting head is used to tighten the optical cable and lead out the optical cable, and the led-out optical cable is connected to the salvage device; The storage rod is mounted on the end cover and is located in the housing. A plurality of coils and a plurality of retaining rings are wound around the storage rod. Half of the optical cable of each coil is wound clockwise and the other half is wound counterclockwise. The ends of the optical cables on adjacent coils are connected, and a retaining ring is provided between two adjacent coils. The first wire drawing head is connected to the end cover and to the inner wall of the drill collar; The second wire drawing head is connected to the cover shell and to the inner wall of the drill collar.

[0006] In some optional embodiments, preferably, the wire lifting head includes a wire lifting drum, a wire clamp, a gasket and a pressure cap, one end of the wire lifting drum is connected to the cover shell; the wire clamp is inserted into the other end of the wire lifting drum, and the wire clamp is provided with a wire clamping hole for clamping the optical cable and leading out the optical cable; the gasket is sleeved on the wire clamp; the pressure cap is sleeved on the wire clamp and inserted into the wire lifting drum, and the pressure cap is in contact with the gasket, and the pressure cap is detachably connected to the wire clamp.

[0007] In some optional embodiments, preferably, the wire lifting drum includes a coaxial large diameter section, a small diameter section and a connecting section, the large diameter section is provided with a limiting flange, the large diameter section is inserted into the cover shell and connected to the cover shell, and the limiting flange is in contact with the end face of the cover shell; the wire clamp is inserted into the small diameter section; the connecting section respectively connects the large diameter section and the small diameter section, and the connecting section is a conical cylinder.

[0008] In some optional embodiments, preferably, the wire lifting head also includes a wire barrel, which is sleeved outside the wire clamp, gasket and pressure cap and connected to the small diameter section; the wire barrel is provided with a wire hole on the peripheral wall at one end away from the small diameter section, and the optical cable passes through the wire hole after coming out of the wire clamp hole and is connected to the salvage device.

[0009] In some optional embodiments, preferably, the first wire drawing head includes a first bottom ring, a first top ring and a plurality of first connecting keys, the first bottom ring is connected to the end surface of the end cover, the first bottom ring and the first top ring are coaxially spaced, the plurality of first connecting keys are evenly distributed along the circumference of the first bottom ring, and the first connecting keys are respectively connected to the first bottom ring and the first top ring, and the ends extend out of the first bottom ring, and the portions of the first connecting keys extending out of the first bottom ring are connected to the outer wall of the cover shell; The inner wall of the drill collar is provided with a positioning groove and a limiting portion, the first connecting key is plugged into the positioning groove, and the first top ring is in contact with the limiting portion.

[0010] In some optional embodiments, preferably, the wire storage rod includes a plurality of sub-rods, each sub-rod is a hollow shaft with an axial hole inside, one end of the sub-rod is provided with a plug-in portion, and the end of the axial hole away from the plug-in portion is used to connect the end cover, or to be plugged with the plug-in portion of an adjacent sub-rod.

[0011] In some optional embodiments, preferably, the optical cable on each coil is fixed by glue, and after the coil on the sub-pole is installed, the optical cable and the sub-pole are connected by glue.

[0012] In some optional embodiments, preferably, a short section and a self-sealing core are further included, wherein the short section is installed in the drill collar, one end of which is connected to the second wire drawing head, and the other end of which abuts against the self-sealing core; the self-sealing core is installed in the drill collar.

[0013] In some optional embodiments, preferably, the second thread drawing head includes a second bottom ring, a second top ring and a plurality of second connecting keys, the second bottom ring is connected to the end face of the short section; the second top ring and the second bottom ring are coaxially spaced apart, and the second top ring abuts against the thread pulling head; a plurality of second connecting keys are evenly distributed along the circumference of the second bottom ring, and the second connecting keys are respectively connected to the second bottom ring and the second top ring, and the end extends out of the second top ring, and the part of the second connecting key extending out of the second top ring is connected to the outer wall of the cover shell.

[0014] In some optional embodiments, preferably, the outer wall of the retaining ring is provided with a chamfer.

[0015] In some optional embodiments, preferably, the entire line storage device is first lowered to the bottom of the well together with the drill collar, and the optical cable is pulled from the bottom of the well to the wellhead. The end of the optical cable on the line storage rod away from the line lifting head is used to connect to the wet connector to transmit the optical signal at the bottom of the well.

[0016] The downhole optical cable silo device based on the outgoing line method for measuring while drilling and the method of using the same have the following beneficial effects compared with the prior art: (1) The storage rod is installed on the end cover, and the end cover and the lifting head are detachably installed on the two ends of the cover shell. The end cover and the lifting head are connected to the inside of the drill collar through the first pulling head and the second pulling head respectively, so that the storage rod and the drill collar move synchronously, and the two do not rotate relative to each other, ensuring that the optical cable in the middle will not be twisted off; half of the optical cable of each coil is wound clockwise and the other half is wound counterclockwise, ensuring that the optical cable is untwisted when released, ensuring that there is no torque accumulation during the release process of the optical cable, and further avoiding the phenomenon of the optical cable being twisted off; in addition, a retaining ring is provided between two adjacent coils, so that the optical cable is released coil by coil when released, and the adjacent coils will not be scattered, thereby improving reliability; (2) The gasket is sleeved on the wire clamp, the pressure cap is sleeved on the wire clamp and inserted into the wire lifting drum, the pressure cap contacts the gasket, and the pressure cap is detachably connected to the wire clamp to fix the wire clamp. The wire clamp is provided with a clamping hole for clamping and leading out the optical cable, leading out and clamping the optical cable, ensuring that the optical cable will not fall before the salvage head is salvaged to the salvage device, thereby improving the success rate of salvage and thus improving the reliability of the device; (3) The first bottom ring is connected to the end face of the end cover to realize the connection between the first wire drawing head and the end cover, the first connecting key is respectively connected to the first bottom ring and the first top ring, and the end portion extends out of the first bottom ring, and the portion of the first connecting key extending out of the first bottom ring is connected to the outer wall of the cover shell; the inner wall of the drill collar is provided with a positioning groove and a limiting portion, the first connecting key is plugged into the positioning groove, and the first top ring is in contact with the limiting portion, thereby realizing the connection between the first wire drawing head and the drill collar, and the connection is relatively convenient and quick; (4) The short section is installed in the drill collar, one end of which is connected to the second wire drawing head, and the other end of which is in contact with the self-sealing core; the self-sealing core is installed in the drill collar, and the length difference between the wire storage rod and the drill collar can be supplemented according to the length of the drill collar through the setting of the short section, thereby meeting the design of wire storage rods for drill collars of various lengths, having better compatibility and increasing the scope of application; (5) The outer wall of the retaining ring is provided with a chamfer to avoid the friction between the edges of the outer wall of the retaining ring and the optical cable, which causes greater resistance when the optical cable is released. This ensures that each individual coil can be easily released and avoids scratches on the optical cable caused by the edges, thereby improving the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A three-dimensional diagram of a downhole optical cable silo device for measuring while drilling based on an outgoing line method in an embodiment of the present invention; Figure 2 An exploded view of a downhole optical cable silo device for measuring while drilling based on an outgoing line method in an embodiment of the present invention; Figure 3 Schematic diagram of the structure of the end cover in an embodiment of the present invention; Figure 4 An exploded view of a wire storage rod in an embodiment of the present invention; Figure 5 is a three-dimensional diagram of a sub-rod in an embodiment of the present invention; Figure 6 is a cross-sectional view of a thread lifting head in an embodiment of the present invention; Figure 7 An exploded view of a thread lifting head in an embodiment of the present invention; Figure 8 Schematic diagram of the structure of the thread lifting drum in an embodiment of the present invention; Figure 9Schematic diagram of the structure of the first thread extraction head in an embodiment of the present invention; Figure 10 Schematic diagram of the structure of the second thread extraction head in an embodiment of the present invention; Figure 11 Schematic diagram of the structure of the coil on the wire storage rod in an embodiment of the present invention; Figure 12 For the present invention Figure 11 A partial enlarged view of part A in the middle; Figure 13 A cross-sectional view of the wire magazine device installed on a drill collar in an embodiment of the present invention; Figure 14 For the present invention Figure 13 A partial enlarged view of part B in the middle; Figure 15 For the present invention Figure 13 A partial enlarged view of part C in the middle.

[0019] Description of reference numerals: 1-end cover, 2-cover, 3-wire storage rod, 4-wire lifting head, 5-first wire drawing head, 6-second wire drawing head, 7-coil, 8-retaining ring, 9-short section, 10-self-sealing core; 100-drill collar, 101-positioning groove, 102-limiting part; 11-cover body, 111-first threaded hole, 12-mounting portion, 121-mounting hole; 21-first connecting hole, 22-second connecting hole; 31-sub-rod, 311-axis hole, 312-insertion part; 41-wire drum, 411-large diameter section, 412-small diameter section, 413-connecting section, 414-limiting flange, 415-second threaded hole, 42-wire clamp, 421-wire clamping hole, 43-gasket, 44-pressure cap, 45-wire barrel, 451-wire hole; 51-first bottom ring, 52-first top ring, 53-first connecting key; 61-second bottom ring, 62-second top ring, 63-second connecting key; 81-Chamfer. DETAILED DESCRIPTION

[0020] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0021] Reference Figure 1-15As shown, an embodiment of the present invention proposes a downhole optical cable silo device based on an outgoing line method for measuring while drilling, comprising an end cap 1, a cover 2, a cable storage rod 3, a cable lifting head 4, a first cable extraction head 5 and a second cable extraction head 6, wherein: The end cover 1 and the thread lifting head 4 are respectively detachably mounted on the two ends of the cover shell 2; the end cover 1 includes a cover body 11 and a mounting portion 12, the cover body 11 is a stepped shaft, a first threaded hole is provided on the cover body 11, and a first connecting hole 21 and a second connecting hole 22 are respectively provided at both ends of the outer wall of the cover shell 2, and a bolt is passed through the first connecting hole 21 and connected to the first threaded hole to realize the detachable connection between the end cover 1 and the cover shell 2, and the mounting portion 12 is a hollow shaft provided with a mounting hole 121; The cable lifting head 4 is used to tighten the optical cable and lead out the optical cable, and the led-out optical cable is connected to the salvage device; The storage rod 3 is mounted on the mounting hole 121 of the end cover 1 and is located in the housing 2. A plurality of coils 7 and a plurality of retaining rings 8 are wound around the storage rod 3. Half of the optical cable of each coil 7 is wound clockwise and the other half is wound counterclockwise. The ends of the optical cables on adjacent coils 7 are connected, and a retaining ring 8 is provided between two adjacent coils 7. The first wire drawing head 5 is connected to the end cover 1 and to the inner wall of the drill collar 100; The second wire drawing head 6 is connected to the housing 2 and to the inner wall of the drill collar 100 .

[0022] It should be noted that the entire line bin device is first lowered to a position several kilometers below the bottom of the well together with the drill collar 100. When the drill pipe reaches the corresponding position, the salvage head will go down to salvage the optical cable from the bottom of the well. While salvaging it upwards, the optical cable is released from the line storage rod 3 at the bottom of the well, and the optical cable is pulled from the bottom of the well to the wellhead. The end of the optical cable on the line storage rod 3 away from the line lifting head 4 is used to connect to the wet joint to transmit the optical signal from the bottom of the well, thereby realizing two-way communication between the bottom of the well and the bottom surface of the wellhead.

[0023] The present embodiment proposes a downhole optical cable storage device for measurement while drilling based on an external line method, which is installed on the end cover 1 through the storage rod 3, and the end cover 1 and the lifting head 4 are detachably installed on the two ends of the cover shell 2, respectively. The end cover 1 and the lifting head 4 are connected to the inside of the drill collar 100 through the first pulling head 5 and the second pulling head 6, respectively, so that the storage rod 3 and the drill collar 100 move synchronously together, and the two do not rotate relative to each other, ensuring that the optical cable in the middle will not be twisted off; half of the optical cable of each coil 7 is wound clockwise and the other half is wound counterclockwise, ensuring back-twisting when the optical cable is released, ensuring that there is no torque accumulation during the release of the optical cable, and further avoiding the phenomenon of the optical cable being twisted off; in addition, a retaining ring 8 is provided between two adjacent coils 7, so that the optical cable is released one coil 7 at a time when released, and will not cause the adjacent coils 7 to scatter, thereby improving reliability.

[0024] In some embodiments, the wire lifting head 4 includes a wire lifting drum 41, a wire clamp 42, a gasket 43 and a pressure cap 44, one end of the wire lifting drum 41 is connected to the cover shell 2; the wire clamp 42 is inserted into the other end of the wire lifting drum 41, and the wire clamp 42 is provided with a wire clamping hole 421 for clamping the optical cable and leading out the optical cable; the gasket 43 is sleeved on the wire clamp 42; the pressure cap 44 is sleeved on the wire clamp 42 and inserted into the wire lifting drum 41, and the pressure cap 44 is in contact with the gasket 43, and the pressure cap 44 is detachably connected to the wire clamp 42. By sleeved the gasket 43 on the wire clamp 42, the pressure cap 44 is sleeved on the wire clamp 42 and inserted into the wire lifting barrel 41, the pressure cap 44 contacts the gasket 43, and the pressure cap 44 and the wire clamp 42 are detachably connected by a top screw to fix the wire clamp 42. The wire clamping hole 421 in the wire clamp 42 is used to guide and clamp the optical cable, and before the salvage head salvages the optical cable to the salvage device, it is ensured that the optical cable will not fall, thereby improving the success rate of salvage and thus improving the reliability of the device.

[0025] In some embodiments, the wire lifting drum 41 includes a coaxial large diameter section 411, a small diameter section 412 and a connecting section 413. A limiting flange 414 is coaxially provided on the large diameter section 411. The large diameter section 411 is inserted into the cover shell 2 and connected to the cover shell 2. The limiting flange 414 abuts against the end face of the cover shell 2. The wire clamp 42 is inserted into the small diameter section 412. The connecting section 413 connects the large diameter section 411 and the small diameter section 412 respectively, and the connecting section 413 is a conical cylinder. A second threaded hole 415 is provided on the outer wall of the large diameter section 411. The bolt passes through the second connecting hole 22 on the cover shell 2 and is connected to the second threaded hole 415 to realize a detachable connection between the wire lifting drum 41 and the cover shell 2. The limiting flange 414 is used to limit and position the large diameter section 411 to facilitate the alignment of the second connecting hole 22 and the second threaded hole 415.

[0026] In some embodiments, the cable lifting head further includes a wire barrel 45, which is sleeved over the cable clamp 42, gasket 43, and pressure cap 44 and connected to the small-diameter section 412. A wire hole 451 is provided on the peripheral wall of the wire barrel 45 at one end away from the small-diameter section 412. After exiting the clamp hole 421, the optical cable passes through the wire hole 451 and connects to the salvage device. The wire hole 451 guides the optical cable, ensuring a stable posture after connection to the salvage device, facilitating docking of the salvage head and the salvage device, and improving the stability and reliability of the device.

[0027] In some embodiments, the first wire drawing head 5 includes a first bottom ring 51, a first top ring 52 and a plurality of first connecting keys 53, the first bottom ring 51 is connected to the end face of the end cover 1, the first bottom ring 51 and the first top ring 52 are coaxially spaced, and the plurality of first connecting keys 53 are evenly distributed along the circumference of the first bottom ring 51, and the first connecting keys 53 are respectively connected to the first bottom ring 51 and the first top ring 52, and the end portion extends out of the first bottom ring 51, and the part of the first connecting key 53 extending out of the first bottom ring 51 is connected to the outer wall of the cover shell 2; the inner wall of the drill collar 100 is provided with a positioning groove 101 and a limiting portion 102, the first connecting key 53 is plugged into the positioning groove 101, and the first top ring 52 is in conflict with the limiting portion 102. The first wire drawing head 5 is connected to the end cover 1 by connecting the first bottom ring 51 with the end face of the end cover 1. The first connecting key 53 connects the first bottom ring 51 and the first top ring 52 respectively, and the end extends out of the first bottom ring 51. The part of the first connecting key 53 extending out of the first bottom ring 51 is connected to the outer wall of the cover shell 2; the inner wall of the drill collar 100 is provided with a positioning groove 101 and a limiting portion 102, the first connecting key 53 is plugged into the positioning groove 101, and the first top ring 52 is in conflict with the limiting portion 102, thereby realizing the connection between the first wire drawing head 5 and the drill collar 100, and the connection is relatively convenient and quick.

[0028] In some embodiments, the wire storage rod 3 includes a plurality of sub-rods 31, each of which is a hollow shaft and has an axial hole 311 therein. One end of the sub-rod 31 is provided with a plug-in portion 312, and the end of the axial hole 311 away from the plug-in portion 312 is used to connect to the end cap 1, or to plug with the plug-in portion 312 of an adjacent sub-rod 31. The end of the axial hole 311 of the sub-rod 31 close to the end cap 1 away from the plug-in portion 312 is plugged with the mounting hole 121 on the end cap 1, and the axial holes 311 of the other sub-rods 31 are plugged with the plug-in portion 312 of the adjacent sub-rod 31, thereby completing the assembly of the entire wire storage rod 3. The overall length of the wire storage rod 3 can be adjusted at will according to the length of the drill collar 100, which provides better adaptability and improves the reliability of the device.

[0029] In some embodiments, the optical cable on each coil 7 is secured with glue. After the coil 7 on the sub-rod 31 is installed, the optical cable and sub-rod 31 are connected with glue. The coil 7 is prepared using a mold, and the optical cable on each individual coil 7 is secured with glue to ensure that it will not be fed in a high-temperature and high-pressure environment. After the entire coil 7 on the storage rod 3 is installed, it is necessary to re-glue the entire coil 7 from the top to ensure that the entire coil 7 is fixed to the storage rod 3.

[0030] In some embodiments, the wire storage device further includes a short section 9 and a self-sealing core 10. The short section 9 is installed in the drill collar 100, with one end connected to the second wire drawing head 6 and the other end abutting against the self-sealing core 10; the self-sealing core 10 is installed in the drill collar 100. By providing the short section 9, the length difference between the wire storage rod 3 and the drill collar 100 can be supplemented according to the length of the drill collar 100, thereby meeting the design of the wire storage rod 3 for drill collars 100 of various lengths, improving compatibility and increasing the scope of application.

[0031] In some embodiments, the second thread drawing head 6 includes a second bottom ring 61, a second top ring 62 and a plurality of second connecting keys 63, the second bottom ring 61 is connected to the end face of the short section 9; the second top ring 62 and the second bottom ring 61 are coaxially spaced, and the second top ring 62 abuts against the thread pulling head 4; a plurality of second connecting keys 63 are evenly distributed along the circumference of the second bottom ring 61, and the second connecting keys 63 are respectively connected to the second bottom ring 61 and the second top ring 62, and the end extends out of the second top ring 62, and the part of the second connecting key 63 extending out of the second top ring 62 is connected to the outer wall of the cover shell 2. The second bottom ring 61 is connected to the end face of the short section 9, and the short section 9 is installed in the drill collar 100 to realize the connection between the second wire drawing head 6 and the drill collar 100; the second top ring 62 is in contact with the limiting flange 414 of the wire lifting drum 41, and the second connecting key 63 extends out of the second top ring 62 and is connected to the second connecting hole 22 on the outer wall of the cover shell 2 to realize the connection between the second wire drawing head 6 and the cover shell 2, and the connection is more convenient and reliable.

[0032] In some embodiments, the outer wall of the retaining ring 8 is provided with a chamfer 81. The provision of the chamfer 81 can prevent the edges of the outer wall of the retaining ring 8 from causing a large friction force on the optical cable, thereby preventing a large resistance when the optical cable is released, ensuring that each individual coil 7 can be easily released, and preventing the edges from scratching the optical cable, thereby improving the reliability of the device.

[0033] The working principle of the downhole optical cable bin device for measurement while drilling based on the outgoing line mode in this embodiment is as follows: the optical cable on each individual coil 7 is fixed by glue. After all the coils 7 are installed on the wire storage rod 3, the entire device needs to be glued from the top, the part of the first connecting key 53 extending out of the first bottom ring 51 is connected to the outer wall of the cover shell 2, the second top ring 62 abuts against the limiting flange 414 of the wire lifting drum 41, the part of the second connecting key 63 extending out of the second top ring 62 is connected to the second connecting hole 22 on the outer wall of the cover shell 2, so as to realize the connection between the second wire drawing head 6 and the cover shell 2, the entire wire bin device is inserted into the drill collar 100 as a whole, the first connecting key 53 is plugged into the positioning groove 101, the first top ring 52 abuts against the limiting part 102, so as to realize the connection between the first wire drawing head 5 and the drill collar 100, the self-sealing core 10 is installed in the drill collar 100, the end of the short section 9 is limited, and the installation of the entire wire bin device is completed. The storage rod 3 moves synchronously with the drill collar 100, and the two do not rotate relative to each other, ensuring that the optical cable in the middle will not be twisted off; half of the optical cable in each coil 7 is wound clockwise and the other half is wound counterclockwise, ensuring that the optical cable is twisted back when released, ensuring that there is no torque accumulation during the release process of the optical cable, and further avoiding the phenomenon of the optical cable being twisted off.

[0034] 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 scope of protection of the present invention.

Claims

1. A downhole optical cable silo device for measuring while drilling based on an outgoing line method, characterized in that: It includes an end cover, a cover shell, a wire storage rod, a wire lifting head, a first wire drawing head and a second wire drawing head, wherein: The end cover and the thread lifting head are detachably mounted on both ends of the cover shell; The cable lifting head is used to tighten the optical cable and lead out the optical cable, and the led-out optical cable is connected to the salvage device; The storage rod is mounted on the end cover and is located in the housing. A plurality of coils and a plurality of retaining rings are wound around the storage rod. Half of the optical cable of each coil is wound clockwise and the other half is wound counterclockwise. The ends of the optical cables on adjacent coils are connected, and a retaining ring is provided between two adjacent coils. The first wire drawing head is connected to the end cover and to the inner wall of the drill collar; The second wire drawing head is connected to the cover shell and to the inner wall of the drill collar.

2. The downhole optical cable silo device for measuring while drilling based on the outgoing line method according to claim 1 is characterized in that: The wire lifting head includes a wire lifting drum, a wire clamp, a gasket and a pressure cap, one end of the wire lifting drum is connected to the cover shell; the wire clamp is inserted into the other end of the wire lifting drum, and the wire clamp is provided with a wire clamping hole for clamping the optical cable and leading out the optical cable; the gasket is sleeved on the wire clamp; the pressure cap is sleeved on the wire clamp and inserted into the wire lifting drum, and the pressure cap is in contact with the gasket, and the pressure cap is detachably connected to the wire clamp.

3. The downhole optical cable silo device for measuring while drilling based on the outgoing line method according to claim 2 is characterized in that: The wire lifting drum includes a large diameter section, a small diameter section and a connecting section of a coaxial line. The large diameter section is provided with a limiting flange. The large diameter section is inserted into the cover shell and connected to the cover shell, and the limiting flange is in contact with the end face of the cover shell; the wire clamp is inserted into the small diameter section; the connecting section connects the large diameter section and the small diameter section respectively, and the connecting section is a conical cylinder.

4. The downhole optical cable silo device for measuring while drilling based on an outgoing line method according to claim 3, characterized in that: The wire lifting head also includes a wire tube, which is sleeved outside the wire clamp, gasket and pressure cap and connected to the small diameter section; a wire hole is provided on the peripheral wall of the wire tube at one end away from the small diameter section, and the optical cable passes through the wire hole after coming out of the wire clamping hole and is connected to the salvage device.

5. The downhole optical cable silo device for measuring while drilling based on an outgoing line method according to claim 1, characterized in that: The first wire drawing head includes a first bottom ring, a first top ring, and a plurality of first connecting keys, wherein the first bottom ring is connected to the end surface of the end cover, the first bottom ring and the first top ring are coaxially spaced apart, the plurality of first connecting keys are evenly distributed along the circumference of the first bottom ring, and the first connecting keys are respectively connected to the first bottom ring and the first top ring, and the ends of the first connecting keys extend out of the first bottom ring, and the portions of the first connecting keys extending out of the first bottom ring are connected to the outer wall of the housing; The inner wall of the drill collar is provided with a positioning groove and a limiting portion, the first connecting key is plugged into the positioning groove, and the first top ring is in contact with the limiting portion.

6. The downhole optical cable silo device for measuring while drilling based on an outgoing line method according to claim 1, characterized in that: The wire storage rod includes multiple sub-rods, each of which is a hollow shaft with an axial hole inside. One end of the sub-rod is provided with a plug-in portion, and the end of the axial hole away from the plug-in portion is used to connect to the end cover or to be plugged with the plug-in portion of an adjacent sub-rod.

7. The downhole optical cable silo device for measuring while drilling based on an outgoing line method according to claim 6, characterized in that: The optical cable on each coil is fixed with glue. After the coil on the sub-pole is installed, the optical cable and the sub-pole are connected with glue.

8. The downhole optical cable silo device for measuring while drilling based on an outgoing line method according to claim 1, characterized in that: It also includes a short section and a self-sealing core. The short section is installed in the drill collar, one end of which is connected to the second wire drawing head, and the other end of which abuts against the self-sealing core. The self-sealing core is installed in the drill collar.

9. The downhole optical cable silo device for measuring while drilling based on an outgoing line method according to claim 8, characterized in that: The second thread-drawing head includes a second bottom ring, a second top ring, and a plurality of second connecting keys, wherein the second bottom ring is connected to the end surface of the short section; the second top ring and the second bottom ring are coaxially spaced apart, and the second top ring abuts against the thread-lifting head; Multiple second connecting keys are evenly distributed along the circumference of the second bottom ring, and the second connecting keys are respectively connected to the second bottom ring and the second top ring, and the ends extend out of the second top ring. The part of the second connecting key extending out of the second top ring is connected to the outer wall of the cover shell.

10. The downhole optical cable silo device for measuring while drilling based on an outgoing line method according to any one of claims 1 to 9, characterized in that: The outer wall of the retaining ring is provided with a chamfer.

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