Downhole butt tool, male connection and free catch release connection

Abstract

The present application relates to the technical field of through-the-bit logging, and is a downhole butt joint tool, a connecting male joint and a free catch release joint. The downhole butt joint tool comprises a supporting cylinder, a butt joint short section, a suspension short section, a suspension cylinder and a supporting assembly. The connecting male joint comprises a male gun main body, a male joint connecting sleeve, a wiring column body, a catch cylinder, a piston rod and the downhole butt joint tool. The free catch release joint comprises a joint shell, a driving motor, a transmission mechanism, a central joint, a slotted joint, a female joint body, a wiring ring body and the connecting male joint. The present application has a reasonable and compact structure and is convenient to use. The butt joint short section and the suspension short section are jointly connected and installed on a drill pipe to be sent downhole in advance while drilling, so as to provide a suitable operation environment for a pipe string provided with a through-the-bit logging instrument, improve the stability and reliability of the release and catch operation of the through-the-bit logging instrument, and facilitate the laying of a connecting cable of the through-the-bit instrument through the setting of a first threading channel. The present application has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of drilling logging technology, and is a downhole docking tool, a connecting male connector, and a free-release connector. Background Technology

[0002] Over-the-bit logging (TBL) is a data acquisition method that involves inserting logging instruments through the drill string and a specially designed drill bit into the open hole to collect formation evaluation data. It can be performed using either cable-operated or trip-while-drilling (TBL) tools. Currently, due to the efficient utilization of drilling rigs, TBL storage docking tools are widely used in oilfield production. However, these currently used docking tools only have a one-way release function. That is, when the logging instrument is inserted into the open hole through the drill string and drill bit using the docking tool, the caliper legs and density instrument legs are deployed and disconnected from the logging instrument. After releasing the logging instrument, it cannot be reconnected to the downhole logging instrument. After completing the logging operation, the logging instrument can only be lifted to the wellhead surface with the drill string. In actual production, this type of docking tool with only one-way release function still has significant defects and obvious shortcomings, mainly reflected in: (1) the caliper leg and density instrument leg that are deployed after logging cannot be retracted. During the lifting process, they are very easy to get stuck on the well wall of the open hole, causing the caliper leg or density instrument leg to break or even damage the logging instrument; (2) if a stuck accident occurs during the drilling tool lifting process, the drilling party can only wait for the accident to be handled, which increases the logging cycle, increases the logging risk, and reduces the logging efficiency. Moreover, if the logging instrument is damaged during the accident handling, the logging data may not be obtained, resulting in logging failure; (3) if the same well location needs to be tested multiple times with logging instruments, the drilling tool must be repeatedly dropped into the well and lifted out of the well, which significantly increases the logging work cycle, work cost and work intensity. Therefore, it is necessary to study and develop a downhole docking tool for logging instruments with stable performance and complete functions to improve the logging work efficiency and promote the innovative development of the logging process. Summary of the Invention

[0003] This invention provides a downhole docking tool, a connecting male connector, and a free-release connector, which overcomes the shortcomings of the prior art. It can effectively solve the problems of existing docking tools, such as easy damage to logging instruments, high logging risk, low logging efficiency, long logging cycle, and high workload.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a downhole docking tool, comprising a support cylinder, a docking sub, a suspension sub, a suspension cylinder, and a support assembly. A hollow suspension cylinder is rotatably mounted on the inner side of the upper part of the suspension sub. The inner side of the upper end of the suspension cylinder has a first conical support surface that is larger at the top and smaller at the bottom. The inner side of the upper end of the suspension sub, corresponding to the position above the suspension cylinder, is fixedly installed together with the outer side of the lower end of the docking sub. A support cylinder with its lower end located inside the suspension cylinder is fitted inside the suspension cylinder. The upper end of the support cylinder is located inside the lower part of the docking sub. A first through-channel is provided in the center of the upper end of the support cylinder. A first cable connection assembly is fixedly installed on the inner side of the lower end of the support cylinder. A support assembly with a lower end face matching the first support surface is installed on the outer side of the lower part of the suspension cylinder, corresponding to the position below the docking sub.

[0005] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions:

[0006] The aforementioned support assembly may include a front support block and a rear support block symmetrically fixedly installed on the outside of the support cylinder. The cross-section of the front support block and the rear support block on the horizontal plane is a semi-circular ring, and the cross-section of the front support block and the rear support block on the vertical plane is an isosceles trapezoid with a larger outer diameter and a smaller inner diameter. The lower ends of the front support block and the rear support block form a second support surface that matches the first support surface. The left front side and the right front side of the rear support block each have two front-to-back connecting screw holes spaced vertically. The rear side of the front support block corresponding to each connecting screw hole position has a connecting through hole that runs through the front and rear. The rear support block and the front support block are fixed together by connecting bolts that pass through the connecting through holes and are screwed into the corresponding connecting screw holes.

[0007] Both the front and rear support blocks can be provided with several vertically connected guide channels at intervals.

[0008] The aforementioned rear support block has two rear pin holes arranged vertically at intervals on both the left front side and the right front side. The rear side of the front support block corresponding to each rear pin hole position is provided with a front pin hole, and each front pin hole is provided with a positioning pin whose rear end is tightly fitted into the corresponding rear pin hole.

[0009] The upper inner side of the aforementioned suspension short section may be provided with a lower step surface, on which a first bearing is installed. The suspension cylinder is coaxially disposed on the upper end of the first bearing, and several vertical support ribs are distributed at intervals along the circumference on the inner side of the upper end of the suspension cylinder.

[0010] The aforementioned first cable connection assembly may include a first plug and a first socket that cooperate with each other, and the first plug and the first socket are fixedly installed on the inner side of the lower end of the support cylinder from top to bottom.

[0011] The second technical solution of the present invention is achieved through the following measures: A connecting male connector includes a male gun body, a male connector connecting sleeve, a terminal block, a gripper, a piston rod, and a downhole docking tool. The male gun body has a second through-channel, extending vertically. A guide head is provided above the male gun body. A terminal block is sealed and fixedly installed between the inner side of the lower end of the guide head and the inner side of the upper end of the male gun body. A gripper with its upper end above the guide head is fixedly installed on the outer side of the upper part of the male gun body. Several upward-opening and interconnected telescopic grooves are evenly distributed along the circumference of the outer side of the lower part of the gripper. A J-shaped chuck with its upper end above the gripper is fixedly installed on the inner side of the upper end of the gripper between each pair of adjacent telescopic grooves. A centralizer is coaxially fitted on the outer side of the upper part of the male gun body corresponding to the position below the gripper. The outer side of the lower end of the male gun body is sealed and fixedly installed together with the inner side of the upper end of the male connector connecting sleeve. The inner side of the lower end of the male connector connecting sleeve is sealed and fixedly installed together with the outer side of the upper end of the support cylinder of the downhole docking tool. A second socket is fixedly installed. A second plug that mates with the second socket is sealed and fixedly installed on the inner side of the lower part of the male connector sleeve. A piston rod, whose upper end is fixedly installed together with the inner side of the lower end of the male gun body, is coaxially fitted on the lower part of the male connector sleeve above the second plug. The piston rod has a third through-channel that runs vertically through it. Several first oil guide holes that are evenly distributed around the circumference on the outer side of the upper end of the piston rod are connected internally and externally. A second oil guide hole that runs radially through it is provided on the outer side of the lower end of the male gun body corresponding to each first oil guide hole. A piston head that is fixedly installed on the outer side of the lower part of the piston rod and whose outer side is in sealed contact with the inner side of the male connector sleeve is fixedly in contact with it. A piston ring is sealed between the inner side of the male connector sleeve and the outer side of the piston rod at the position between the piston head and the lower end of the male gun body. A tension spring that is fitted on the outer side of the upper part of the piston rod is fixedly installed between the upper end of the piston ring and the lower end of the male gun body. Several third oil guide holes that are connected internally and externally are evenly distributed around the circumference on the inner side of the male connector sleeve at the upper end of the piston head.

[0012] The following are further optimizations and / or improvements to the second technical solution of the above invention:

[0013] The aforementioned terminal block may include a connecting rod, an inner insulating ring, and an inner conductive ring. A first connecting ring platform is fixed to the inner side of the upper end of the male gun body. The outer side of the upper end and the outer side of the lower end of the connecting rod are respectively fixedly installed on the inner side of the guide head and the inner side of the first connecting ring platform. Three inner insulating rings are arranged at intervals on the outer side of the connecting rod. The lower end of the inner insulating ring located at the bottom is sealed and fixedly installed together with the upper end of the male gun body. The outer side of the upper end of the inner insulating ring located at the top is sealed and in contact with the inner side of the lower end of the guide head. An inner conductive ring is sealed and fixedly installed between each two adjacent inner insulating rings. There is a gap between the inner side of each inner conductive ring and between the inner side of each inner insulating ring and the outer side of the connecting rod. At least one fourth oil guide hole is evenly distributed along the circumference on the lower end face of the first connecting ring platform.

[0014] The outer side of the upper end of the aforementioned guide head may be provided with a tapered guide surface that is smaller at the top and larger at the bottom.

[0015] The aforementioned stabilizer can be a spring stabilizer. The upper outer side of the main body of the gun is provided with an upper ring groove and a lower ring groove spaced apart. The upper outer side and the lower outer side of the stabilizer are slidably installed in the upper ring groove and the lower ring groove, respectively.

[0016] The aforementioned male connector sleeve may have an upper connecting hole, an upper adjusting hole, a lower adjusting hole, an upper mounting hole, a lower mounting hole, and a lower connecting hole connected sequentially from top to bottom. The lower outer side of the male gun body is sealed and fixedly installed on the upper part of the upper connecting hole. The piston ring is sealed and installed in the upper adjusting hole. The piston head is sealed and installed in the lower adjusting hole. The upper outer side of the support cylinder is sealed and fixedly installed on the lower part of the lower connecting hole. A fixing sleeve is installed on the upper inner side of the lower connecting hole corresponding to the position above the support cylinder. The second plug is fixedly installed on the lower inner side of the fixing sleeve. The upper end of the fixing sleeve is fixedly installed with a third socket fitted into the lower mounting hole. A third plug that cooperates with the third socket is sealed and fixedly installed in the upper mounting hole. An upper step surface is formed between the upper adjusting hole and the lower adjusting hole. Four third oil guide holes are evenly distributed along the circumference on the upper step surface, inclined from the inside to the outside from top to bottom.

[0017] The lower outer side of the male gun body above the corresponding male connector connecting sleeve may be provided with at least one radially penetrating upper oil injection hole, and an upper oil injection plug is sealed and fixedly installed in each upper oil injection hole. The middle outer side of the male connector connecting sleeve is provided with at least one lower oil injection hole communicating with the lower adjustment hole, and a lower oil injection plug is sealed and fixedly installed in each lower oil injection hole.

[0018] The third technical solution of the present invention is achieved through the following measures: A free-release connector includes a connector housing, a drive motor, a transmission mechanism, a central connector, a slotted connector, a female connector body, a wiring ring body, and a connecting male connector. The connector housing, the central connector, and the slotted connector are coaxially and fixedly installed on the inner side of the upper part of the mating section of the connecting male connector from top to bottom. The drive motor is sealed and fixedly installed on the inner side of the upper part of the connector housing. The drive motor has an output shaft at its lower end. An anti-rotation block with its upper end located below the drive motor is fixedly installed on the inner side of the upper end of the central connector. A vertically penetrating slide is provided at the center of the upper end of the anti-rotation block. A nut is slidably installed along the vertical direction inside the slide. Both sides of the middle of the anti-rotation block are provided with internally and externally communicating strip-shaped limiting grooves. Each limiting groove has an end that connects to... A limiting pin is fixedly installed on the outer side of the screw nut at a corresponding position. A push-pull rod with its lower end sealed and passing through the central connector is fixedly installed on the inner side of the lower end of the screw nut. A screw rod is screwed to the inner side of the upper end of the screw nut. The upper end of the screw rod is connected to the lower end of the output shaft through a transmission mechanism located inside the connector housing. A radially penetrating strip-shaped lifting hole is provided on the outer side of the slotted connector at the position below the central connector. A radial support rod with both ends located on the outer side of the slotted connector passes through the lower part of the lifting hole. A vertically penetrating fixing hole is provided in the middle of the radial support rod. The lower outer side of the push-pull rod is fixedly installed in the fixing hole. A sleeve with its upper inner side fixedly installed together with both ends of the radial support rod is provided on the outer side of the lower part of the slotted connector. The upper end of the oil reservoir sleeve, which is fitted inside the sleeve on the outer side of the upper part of the slotted connector, is sealed and fixed. The slotted joint is assembled with a second connecting ring fixed to the inner side of its lower end. An isolation plug is sealed to the inner side of the middle of the oil reservoir sleeve. A protective tube, whose upper end is close to the lower end of the second connecting ring, is fixed to the upper end of the isolation plug. A guide hole runs vertically through the upper end of the isolation plug. The lower end of the push-pull rod passes through the second connecting ring and is located on the inner side of the lower part of the protective tube. A female connector body, whose lower end is below the clamp, is sealed to the inner side of the lower end of the oil reservoir sleeve corresponding to the position below the isolation plug. A piston rod is fixed to the center of the upper end of the female connector body. A fourth oil guide hole, extending to the lower end of the female connector body, is located at the center of the upper end of the piston rod. A piston cap is fixed to the outer side of the upper end of the piston rod. Several vertically penetrating connecting holes are distributed at intervals on the upper end of the piston cap. The outer side of the upper part of the female connector body... Several interconnected first balance holes are evenly distributed around the circumference. A balance piston is sealed and installed on the inner side of the upper part of the fourth oil guide hole. The outer side of the upper part of the guide head is coaxially fitted onto the inner side of the lower part of the fourth oil guide hole. A second balance hole is provided on the outer side of the lower part of the sleeve corresponding to the position of each first balance hole. An outer ring groove matching the claw of the connecting male connector is provided on the outer side of the female connector body below the first balance hole. Each claw is engaged in the groove formed by the lower end of the sleeve and the outer ring groove. A protective sleeve is sealed and fixedly installed on the outer side of the lower end of the female connector body. A guide cap fitted onto the outer side of the upper end of the male gun body is sealed and fixedly installed on the outer side of the lower end of the protective sleeve. A wire ring body with a gap between its outer side and the inner side of the protective sleeve, matching the wire post of the connecting male connector, is fixedly installed on the lower end of the female connector body.The lower end of the female connector body corresponding to the position between the terminal block and the sheath has a fourth through-path for wiring; the lower end of the isolation plug has a fifth through-path for wiring; the lower end of the slotted connector has a sixth through-path for wiring; the lower end of the central connector corresponding to the sixth through-path has a seventh through-path for wiring, connecting the inside and outside; and a sealing connector is fixedly installed on the inner side of the upper part of the connector housing corresponding to the position above the drive motor.

[0019] The following are further optimizations and / or improvements to the third technical solution of the above invention:

[0020] The aforementioned connector ring body may include an outer conductive ring, an outer insulating ring, and a grounding ring. Three outer insulating rings corresponding to the inner insulating ring are arranged at intervals on the inner side of the sheath. The uppermost outer insulating ring is sealed and fixedly installed with the lower end of the female connector body. The lowermost outer insulating ring is sealed and fixedly installed with the upper end of the grounding ring located inside the conductor cap. An outer conductive ring in contact with the inner conductive ring is sealed and fixedly installed between each two adjacent outer insulating rings. There is a gap between the outer side of each outer conductive ring and between the outer side of each outer insulating ring and the inner side of the sheath.

[0021] An anti-flooding plug is sealed and fixedly installed between the inner side of the upper part of the central connector and the outer side of the upper part of the push-pull rod. The lower end of the anti-flooding plug is provided with an eighth wire channel that runs vertically through it. A cable connector is sealed and fixedly installed in the eighth wire channel. A straightening ring is fixedly installed on the outer side of the central connector corresponding to the position of the anti-flooding plug.

[0022] A connecting tube fitted onto the outer side of the lower part of the lead screw can be fixedly installed on the inner side of the lower end of the aforementioned lead screw nut. The inner side of the lower end of the connecting tube is fixedly installed together with the outer side of the upper end of the push-pull rod.

[0023] The aforementioned transmission mechanism may include a coupling, a lower mounting sleeve, and an upper mounting sleeve. A lower mounting sleeve, fitted inside the connector housing, is fixedly installed on the inner side of the upper end of the anti-rotation block. At least two second bearings are distributed vertically between the inner side of the lower mounting sleeve and the outer side of the upper part of the lead screw. A motor cylinder is sealed between the drive motor and the connector housing. An upper mounting sleeve is fixedly installed between the lower end of the motor cylinder and the upper end of the lower mounting sleeve. A coupling is provided inside the upper mounting sleeve. The lower end of the output shaft is connected to the upper end of the lead screw through the coupling.

[0024] The lower part of the aforementioned limit slide can be fixedly installed with a lower limit switch corresponding to the limit pin, and the upper part of the limit slide corresponding to the position above the lower limit switch is fixedly installed with an upper limit switch. The output terminals of the lower limit switch and the upper limit switch are both electrically connected to the input terminal of the drive motor.

[0025] A guide rod can be fixedly installed at the center of the lower end of the aforementioned balance piston.

[0026] The upper end of the aforementioned mating section can be located above the joint housing.

[0027] This invention features a reasonable and compact structure, and is easy to use. It connects the docking short section and the suspension short section together and installs them on the drill pipe before pre-deploying them downhole. This provides a suitable working environment for the tubing string with the over-bit logging instrument installed, improving the stability and reliability of the over-bit logging instrument release and retrieval operations. By setting up a first cable channel, it facilitates the laying of the over-bit instrument connection cable. It has the characteristics of being safe, labor-saving, simple, and efficient. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of the front sectional view of Embodiment 1.

[0029] Appendix Figure 2 This is a schematic diagram of the front sectional view of the grab cylinder in Example 1.

[0030] Appendix Figure 3 For the appendix Figure 1 Enlarged cross-sectional view of section AA.

[0031] Appendix Figure 4 This is a schematic diagram of the front sectional view of section I in Example 2.

[0032] Appendix Figure 5 This is a schematic diagram of the front sectional view of section II in Example 2.

[0033] Appendix Figure 6 This is a schematic diagram of the front sectional view of section III in Example 2.

[0034] Appendix Figure 7 This is a magnified front view cross-sectional diagram of the grab cylinder in Example 2.

[0035] Appendix Figure 8 For the appendix Figure 7 Enlarged cross-sectional view of the structure at point BB.

[0036] Appendix Figure 9 This is a schematic diagram of the front sectional view of section I in Example 3.

[0037] Appendix Figure 10 This is a schematic diagram of the front sectional view of section II in Example 3.

[0038] Appendix Figure 11 This is a schematic diagram of the front sectional view of section III in Example 3.

[0039] Appendix Figure 12 This is a schematic diagram of the front sectional view of segment IV of Example 3.

[0040] Appendix Figure 13 This is a schematic diagram of the front sectional view of segment V in Example 3.

[0041] Appendix Figure 14 For the appendix Figure 10 Enlarged cross-sectional view of the structure at point CC.

[0042] Appendix Figure 15 For the appendix Figure 10 Enlarged cross-sectional view of the structure at point DD.

[0043] The codes in the attached diagram are as follows: 1 for support cylinder, 2 for connecting section, 3 for suspension section, 4 for suspension cylinder, 5 for first bearing, 6 for first plug, 7 for first socket, 8 for front support block, 9 for rear support block, 10 for first wiring channel, 11 for lower step surface, 12 for first support surface, 13 for support rib, 14 for connecting through hole, 15 for connecting bolt, 16 for positioning pin, 17 for guide channel, 18 for male gun body, 19 for male connector sleeve, 20 for gripper cylinder, 21 for piston rod, 22 for guide head, 23 for centralizer, and 24 for first connecting ring platform. 25 is the second socket, 26 is the second plug, 27 is the fixing sleeve, 28 is the third socket, 29 is the third plug, 30 is the upper stepped surface, 31 is the claw, 32 is the piston head, 33 is the piston ring, 34 is the tension spring, 35 is the connecting rod, 36 is the inner insulating ring, 37 is the inner conductive ring, 38 is the first oil guide hole, 39 is the second oil guide hole, 40 is the third oil guide hole, 41 is the guide surface, 42 is the upper ring groove, 43 is the lower ring groove, 44 is the second wire passage, 45 is the upper oil filling plug, 46 is the lower oil filling plug, 47 is the upper connecting hole, and 48 is the upper adjusting hole. 49 is the lower adjustment hole, 50 is the upper mounting hole, 51 is the lower mounting hole, 52 is the lower connecting hole, 53 is the telescopic groove, 54 is the connector housing, 55 is the drive motor, 56 is the output shaft, 57 is the motor cylinder, 58 is the lower limit switch, 59 is the upper limit switch, 60 is the coupling, 61 is the lower mounting sleeve, 62 is the upper mounting sleeve, 63 is the second bearing, 64 is the connecting pipe, 65 is the push-pull rod, 66 is the clamp sleeve, 67 is the central connector, 68 is the anti-rotation block, 69 is the threaded nut, 70 is the limit pin, 71 is the threaded rod, 72 is the anti-pollution plug, 73 is the straightening ring, 74 is... The slotted joint consists of: 75 radial support rod, 76 second connecting ring platform, 77 female joint body, 78 oil reservoir sleeve, 79 piston column, 80 sealing joint, 81 isolation plug, 82 protective tube, 83 sheath, 84 guide cap, 85 piston cap, 86 balance piston, 87 guide rod, 88 outer conductive ring, 89 outer insulating ring, 90 grounding ring, 91 limiting groove, 92 lifting hole, 93 first balance hole, 94 second balance hole, 95 fourth oil guide hole, 96 outer ring groove, 97 connecting hole, and 98 cable joint. Detailed Implementation

[0044] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0045] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0046] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0047] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the downhole docking tool includes a support cylinder 1, a docking sub 2, a suspension sub 3, a suspension cylinder 4, and a support assembly. A hollow suspension cylinder 4 is rotatably mounted on the upper inner side of the suspension sub 3. The upper inner side of the suspension cylinder 4 has a first support surface 12 that is larger at the top and smaller at the bottom, which is conical. The upper inner side of the suspension sub 3, which is located above the suspension cylinder 4, is fixedly installed together with the lower outer side of the docking sub 2. The support cylinder 1, whose lower end is located inside the suspension sub 3, is fitted inside the suspension cylinder 4. The upper end of the support cylinder 1 is located on the lower inner side of the docking sub 2. A first cable passage 10 that runs vertically through the center of the upper end of the support cylinder 1 is provided. A first cable connection assembly is fixedly installed on the lower inner side of the support cylinder 1. A support assembly whose lower end face matches the first support surface 12 is installed on the lower outer side of the suspension cylinder 4, which is located at the lower end of the docking sub 2.

[0048] In use, the docking short section 2 and the suspension short section 3 are connected together and installed on the drill pipe and pre-deployed downhole to provide a suitable working environment for the tubing string with the over-bit logging instrument installed, thereby improving the stability and reliability of the over-bit logging instrument release and retrieval operation. By setting the first cable channel 10, it is convenient to lay the over-bit instrument connection cable. The present invention has a reasonable and compact structure, is easy to use, and has the characteristics of safety, labor saving, simplicity and high efficiency.

[0049] The aforementioned downhole docking tools can be further optimized and / or improved according to actual needs:

[0050] As attached Figure 1 , 3 As shown, the support assembly includes a front support block 8 and a rear support block 9 symmetrically fixedly installed on the outside of the support cylinder 1. The cross-sections of the front support block 8 and the rear support block 9 on the horizontal plane are both semi-circular rings, and the cross-sections of the front support block 8 and the rear support block 9 on the vertical plane are both isosceles trapezoids with a larger outer diameter and a smaller inner diameter. The lower ends of the front support block 8 and the rear support block 9 form a second support surface that matches the first support surface 12. The left front side and the right front side of the rear support block 9 each have two front-to-back connecting screw holes spaced vertically. The rear side of the front support block 8 corresponding to each connecting screw hole position is provided with a connecting through hole 14 that runs through from front to back. The rear support block 9 and the front support block 8 are fixed together by connecting bolts 15 that are screwed into the corresponding connecting screw holes after the screw ends pass through the connecting through holes 14.

[0051] As required, the outer diameter of the cross-sectional circle formed by the front support block 8 and the rear support block 9 is larger than the maximum outer diameter of the support cylinder 1. This design facilitates the assembly and disassembly of the support components during use, and also improves the safety and stability of the installation of drilling logging instrument strings in downhole operations. By setting the first support surface 12 and the second support surface, the support cylinder 1 can be seated inside the suspension cylinder 4, making installation convenient.

[0052] As attached Figure 1 , 3 As shown, both the front support block 8 and the rear support block 9 are provided with several vertically connected guide channels 17 at intervals.

[0053] As required, both the front support block 8 and the rear support block 9 are equipped with three vertically connected flow channels 17. During use, the flow channels 17 can guide the flow of drilling fluid downhole.

[0054] As attached Figure 1 , 3 As shown, the left front side and the right front side of the rear support block 9 are each provided with two rear pin holes arranged vertically and horizontally. The rear side of the front support block 8 corresponding to each rear pin hole position is provided with a front pin hole. Each front pin hole is provided with a positioning pin 16 whose rear end is tightly fitted into the corresponding rear pin hole.

[0055] During use, this setting ensures that the axis of the circle formed by the front support block 8 and the rear support block 9 coincides with the axis of the suspension cylinder 4, preventing uneven wear of the front support block 8 or the rear support block 9 from affecting the use of the support cylinder 1.

[0056] As attached Figure 1 , 2 As shown, the upper inner side of the suspension short section 3 is provided with a lower step surface 11, and a first bearing 5 is installed on the lower step surface 11. The suspension cylinder 4 is coaxially arranged on the upper end of the first bearing 5, and a number of vertical support ribs 13 are distributed along the circumference on the upper inner side of the suspension cylinder 4.

[0057] Depending on the requirements, the first bearing 5 is a known technology, such as a thrust ball bearing. During use, this arrangement enhances the flexibility of the suspension cylinder 4's rotation, and the support ribs 13 improve the strength of the suspension cylinder 4, thus enhancing the stability of the support cylinder 1 resting on the suspension cylinder 4.

[0058] As attached Figure 1 As shown, the first cable connection assembly includes a first plug 6 and a first socket 7 that cooperate with each other. The first plug 6 and the first socket 7 are fixedly installed on the inner side of the lower end of the support cylinder 1 from top to bottom.

[0059] As required, both the first plug 6 and the first socket 7 are existing, well-known technologies. During use, this arrangement facilitates the installation and removal of cables when assembling the support cylinder 1 and the logging instrument, and also facilitates cable maintenance and installation.

[0060] Example 2: As shown in the attached document Figure 4 , 5 As shown in Figures 6, 7, and 8, the male connector includes a male gun body 18, a male connector connecting sleeve 19, a terminal block, a gripper cylinder 20, a piston rod 21, and a downhole docking tool. The male gun body 18 has a second through-hole 44 running vertically through it. A guide head 22 is provided above the male gun body 18. A terminal block is sealed and fixedly installed between the inner side of the lower end of the guide head 22 and the inner side of the upper end of the male gun body 18. A gripper cylinder 20 with its upper end located above the guide head 22 is fixedly installed on the outer side of the upper part of the male gun body 18. Several openings are evenly distributed around the lower outer side of the gripper cylinder 20. The upward-facing and interconnected telescopic groove 53 has a J-shaped claw 31 fixed to the inner side of the upper end of the grab cylinder 20 between each pair of adjacent telescopic grooves 53. A centralizer 23 is coaxially fitted to the outer side of the upper part of the male gun body 18 below the grab cylinder 20. The outer side of the lower end of the male gun body 18 is sealed and fixedly installed together with the inner side of the upper end of the male connector sleeve 19. The inner side of the lower end of the male connector sleeve 19 is sealed and fixedly installed together with the outer side of the upper end of the support cylinder 1 of the downhole docking tool. A second socket 25 is fixedly installed on the inner side of the upper end of the support cylinder 1. The lower inner side of the male connector sleeve 19 is sealed and fixedly installed with a second plug 26 that mates with the second socket 25. Corresponding to the position above the second plug 26, the lower part of the male connector sleeve 19 is coaxially fitted with a piston rod 21 whose upper end is fixedly installed with the lower inner side of the male gun body 18. The piston rod 21 has a third through-channel that runs vertically through it. Several first oil guide holes 38, which are interconnected internally and externally, are evenly distributed along the circumference on the outer side of the upper end of the piston rod 21. Corresponding to each first oil guide hole 38, a radially penetrating second oil guide hole is provided on the outer side of the lower end of the male gun body 18. Oil hole 39, piston head 32 is fixed on the lower outer side of piston rod 21, and piston head 32 is sealed to the inner side of male connector sleeve 19. Piston ring 33 is sealed between the inner side of male connector sleeve 19 and the outer side of piston rod 21 at the position between piston head 32 and the lower end of male gun body 18. Tension spring 34 is fixedly installed between the upper end of piston ring 33 and the lower end of male gun body 18 and is fitted on the upper outer side of piston rod 21. Several third oil guide holes 40 with internal and external communication are evenly distributed along the circumference on the inner side of male connector sleeve 19 at the position corresponding to the upper end of piston head 32.

[0061] According to requirements, the chuck 31 is integrated with the gripper cylinder 20. The outer diameter of the circle formed at the upper end of the chuck 31 is smaller than the outer diameter of the gripper cylinder 20. The second plug 26 and the second socket 25 are both existing known technologies. The number of telescopic grooves 53 is 4 to 12. During use, by setting the terminal block, it is easy to realize the connection between the pipe string and the connecting male connector to realize the circuit conduction, and to realize the circuit disconnection by separating from the connecting male connector. It is convenient for flexible control of the over-the-bit logging instrument installed in the downhole docking tool. By setting the chuck 31 and the gripper cylinder 20, the gripper cylinder 20 and the connecting tool can be freely connected or released by the radial contraction or expansion of the chuck 31 through the telescopic groove 53 on the gripper cylinder 20. The connection is simple and reliable. By setting the second wiring channel 44, the electrical connection between the inner conductive ring 37 and the over-the-bit logging instrument at the lower end of the support cylinder 1 can be realized. In use, the oil plug 45 is used to inject oil into the second wiring channel 44, the piston rod 21, and the third plug 25. Silicon oil is injected between the upper side of piston 32 and the lower side of piston ring 33 and the lower side of male gun body 18. The male connector with the drill bit logging instrument installed is lowered into the target area along with the tubing string. The well fluid in the connecting section 2 enters the male connector connecting sleeve 19 between piston head 32 and piston ring 33 through the third oil guide hole 40, and acts on piston ring 33. The well fluid pushes piston ring 33 to move, realizing the pressure balance between silicone oil and well fluid, maintaining the normal structural function of the terminal block, and improving working life. By setting tension spring 34, the large frictional resistance formed by the double seal of piston ring 33, piston rod 21 and male connector connecting sleeve 19 can be offset, improving the accuracy of pressure balance.

[0062] The above-mentioned male connector can be further optimized and / or improved according to actual needs:

[0063] As attached Figure 4 As shown, the terminal block includes a connecting rod 35, an inner insulating ring 36, and an inner conductive ring 37. A first connecting ring platform 24 is fixed to the inner side of the upper end of the male gun body 18. The outer side of the upper end and the outer side of the lower end of the connecting rod 35 are respectively fixedly installed on the inner side of the guide head 22 and the inner side of the first connecting ring platform 24. Three inner insulating rings 36 are arranged vertically and vertically on the outer side of the connecting rod 35. The lower end of the inner insulating ring 36 located at the bottom is sealed and fixedly installed with the upper end of the male gun body 18. The outer side of the upper end of the inner insulating ring 36 located at the top is sealed and in contact with the inner side of the lower end of the guide head 22. An inner conductive ring 37 is sealed and fixedly installed between each two adjacent inner insulating rings 36. There is a gap between the inner side of each inner conductive ring 37 and the inner side of each inner insulating ring 36 and the outer side of the connecting rod 35. At least one fourth oil guide hole 95 is evenly distributed along the circumference of the lower end face of the first connecting ring platform 24.

[0064] During use, the connecting rod 35 facilitates the assembly and disassembly of the inner insulating ring 36 and the inner conductive ring 37. The first connecting ring platform 24 facilitates the installation of the fourth oil guide hole 95, allowing the silicone oil in the second wire passage 44 to enter the gap between the connecting rod 35 and the inner conductive ring 37 through the fourth oil guide hole 95. This ensures that the inner and outer sides of the inner conductive ring 37 are in a balanced stress state, causing the inner conductive ring 37 to expand and facilitating the connection of subsequent conductive components. At the same time, the anti-rotation pin fixed on the first connecting ring platform 24 can also fix the inner insulating ring 36 and the inner conductive ring 37.

[0065] As attached Figure 4 As shown, the upper outer side of the guide head 22 is provided with a tapered guide surface 41 that is smaller at the top and larger at the bottom.

[0066] During use, this setting allows the guide head 22 to guide the tool as it enters the connection tool, preventing damage and improving connection efficiency.

[0067] As attached Figure 4 , 5 As shown, the stabilizer 23 is a spring stabilizer. The upper outer side of the main body 18 of the gun is provided with an upper ring groove 42 and a lower ring groove 43 spaced apart. The upper outer side and the lower outer side of the stabilizer 23 are slidably installed in the upper ring groove 42 and the lower ring groove 43, respectively.

[0068] During use, by setting the upper annular groove 42 and the lower annular groove 43, the outer side of the middle part of the centralizer 23 can be contracted or extended to adapt to wellbores with different inner diameters. It can also prevent the centralizer 23 from failing due to excessive deformation, and at the same time facilitate the installation of the centralizer 23.

[0069] As attached Figure 5 As shown, the male connector sleeve 19 has an upper connecting hole 47, an upper adjusting hole 48, a lower adjusting hole 49, an upper mounting hole 50, a lower mounting hole 51, and a lower connecting hole 52 connected sequentially from top to bottom. The lower outer side of the male gun body 18 is sealed and fixedly installed on the upper part of the upper connecting hole 47. The piston ring 33 is sealed and installed in the upper adjusting hole 48. The piston head 32 is sealed and installed in the lower adjusting hole 49. The upper outer side of the support cylinder 1 is sealed and fixedly installed on the lower part of the lower connecting hole 52. The lower connecting hole 52 is located above the support cylinder 1. A fixing sleeve 27 is installed on the inner side of the upper part of the connector 52. The second plug 26 is fixedly installed on the inner side of the lower part of the fixing sleeve 27. A third socket 28, which is fitted into the lower mounting hole 51, is fixedly installed on the upper end of the fixing sleeve 27. A third plug 29, which cooperates with the third socket 28, is sealed and fixedly installed in the upper mounting hole 50. An upper step surface 30 is formed between the upper adjustment hole 48 and the lower adjustment hole 49. Four third oil guide holes 40 are evenly distributed along the circumference of the upper step surface 30, which are inclined from the inside to the outside from the top to the bottom.

[0070] According to requirements, both the third socket 28 and the third plug 29 are existing known technologies. During use, the fixing sleeve 27 facilitates the assembly and disassembly of the third plug 29 and the third socket 28, and the upper stepped surface 30 facilitates the setting of the third oil guide hole 40. The third oil guide hole 40 is inclined from top to bottom from the inside out, which can reduce the impact of well fluid entering the male connector sleeve 19 on the piston ring 33 and extend the service life of the piston ring 33 and the tension spring 34.

[0071] As attached Figure 5 As shown, at least one radially penetrating upper oil injection hole is provided on the lower outer side of the male gun body 18 above the male connector connecting sleeve 19. Each upper oil injection hole is sealed and fixedly installed with an upper oil injection plug 45. At least one lower oil injection hole communicating with the lower adjustment hole 49 is provided on the middle outer side of the male connector connecting sleeve 19. Each lower oil injection hole is sealed and fixedly installed with a lower oil injection plug 46.

[0072] During use, by setting the upper oil injection plug 45 and the lower oil injection plug 46, it is convenient to add silicone oil into the main body 18 and the head of the male gun, so that the piston ring 33 moves up and down under the action of well fluid and silicone oil, thereby causing the inner conductive ring 37 to expand outward or contract inward, which facilitates subsequent conductive connection.

[0073] Example 3: As shown in the attached document Figure 9 , 10As shown in Figures 11, 12, 13, 14, and 15, the free-release connector includes a connector housing 54, a drive motor 55, a transmission mechanism, a central connector 67, a slotted connector 74, a female connector body 77, a wiring ring body, and a connecting male connector. The connector housing 54, the central connector 67, and the slotted connector 74 are coaxially and fixedly installed on the upper inner side of the mating section 2 of the connecting male connector from top to bottom. The drive motor 55 is sealed and fixedly installed on the upper inner side of the connector housing 54. The drive motor 55 has an output shaft 56 at its lower end. An anti-rotation block 68 with its upper end located below the drive motor 55 is fixedly installed on the upper inner side of the central connector 67. The anti-rotation block 68 has a vertically penetrating slide rail at the center of its upper end. A nut 69 is slidably installed along the vertical direction inside the slide rail. The anti-rotation block 68 has a left-right section in the middle. Both sides are provided with strip-shaped limiting grooves 91 that are connected internally and externally. Each limiting groove 91 is provided with a limiting pin 70 whose end is fixedly installed with the corresponding position on the outside of the screw nut 69. A push-pull rod 65 with its lower end sealed and passing through the central connector 67 is fixedly installed on the inner side of the lower end of the screw nut 69. A screw rod 71 is screwed to the inner side of the upper end of the screw nut 69. The upper end of the screw rod 71 is connected to the lower end of the output shaft 56 through a transmission mechanism located in the connector housing 54. A radially penetrating strip-shaped lifting hole 92 is provided on the outer side of the slotted connector 74 below the central connector 67. A radial support rod 75 with both ends located on the outer side of the slotted connector 74 passes through the lower part of the lifting hole 92. A vertically penetrating fixing hole is provided in the middle of the radial support rod 75. The lower outer side of the push-pull rod 65 The slotted joint 74 is fixedly installed in the fixing hole. A sleeve 66 is provided on the lower outer side of the slotted joint 74, with its upper inner side fixedly installed together with both ends of the radial support rod 75. The lower end of the slotted joint 74 is sealed and fixedly installed together with the upper end of the oil storage sleeve 78, which is fitted inside the sleeve 66 on the upper outer side. A second connecting ring platform 76 is fixedly fixed on the lower inner side of the slotted joint 74. An isolation plug 81 is sealed and installed on the inner side of the middle part of the oil storage sleeve 78. A protective tube 82, whose upper end is close to the lower end of the second connecting ring platform 76, is fixedly installed on the upper end of the isolation plug 81. A guide hole is provided on the upper end of the isolation plug 81, allowing the lower end of the push-pull rod 65 to pass through the second connecting ring platform 76 and be located on the lower inner side of the protective tube 82, corresponding to the position below the isolation plug 81. A female connector body 77, with its lower end located below the clamp 66, is sealed and fixedly installed. A piston rod 79 is fixedly fixed at the center of the upper end of the female connector body 77. A fourth oil guide hole 95, extending from the center of the upper end of the piston rod 79 to the lower end of the female connector body 77, is provided. A piston cap 85 is fixedly installed on the outer side of the upper end of the piston rod 79. Several through holes 97 are distributed at intervals on the upper end of the piston cap 85. Several first balance holes 93, which are connected internally and externally, are evenly distributed along the circumference on the outer side of the upper part of the female connector body 77. A balance piston 86 is sealed and installed on the inner side of the upper part of the fourth oil guide hole 95. The outer side of the upper part of the guide head 22 is coaxially fitted onto the inner side of the lower part of the fourth oil guide hole 95. A second balance hole 94, which is connected internally and externally, is provided on the outer side of the lower part of the clamp 66 corresponding to each position of the first balance hole 93.The outer side of the female connector body 77, located below the first balance hole 93, is provided with an outer ring groove 96 that matches the claws 31 of the male connector. Each claw 31 is engaged in the groove formed by the lower end of the sleeve 66 and the outer ring groove 96. A sheath 83 is sealed and fixedly installed on the lower outer side of the female connector body 77. A guide cap 84, fitted onto the upper outer side of the male gun body 18, is sealed and fixedly installed on the lower outer side of the sheath 83. A wire ring body, with a gap between its outer side and the inner side of the sheath 83 and matching the terminal block of the male connector, is fixedly installed on the lower end of the female connector body 77. The lower end of the female connector body 77, located between the inner side and the outer side of the wiring ring body, has a vertically penetrating liquid guide hole. The lower end of the female connector body 77, corresponding to the position between the terminal block and the sheath 83, has a vertically penetrating fourth wire-passing channel. The lower end of the isolation plug 81 has a vertically penetrating fifth wire-passing channel. The lower end of the slotted connector 74 has a vertically penetrating sixth wire-passing channel. The lower end of the central connector 67, corresponding to the sixth wire-passing channel, has a seventh wire-passing channel connecting the inside and outside. A sealing connector 80 is fixedly installed on the inner side of the upper part of the connector housing 54, corresponding to the position above the drive motor 55.

[0074] According to requirements, the upper end face of the female connector has an oil injection hole extending to the outer side of the upper part of the female connector. An oil injection plug is sealed and screwed into the oil injection hole. The first cable seal passes through the sealing connector 80 and is electrically connected to the input end of the drive motor 55. During use, by setting the limit slide groove 91, the screw nut 69 can be restricted from rotating with the screw rod 71. When the screw rod 71 rotates, it can cause the push-pull rod 65 to move upward, which in turn drives the radial support rod 75 and the clamp 66 to move upward and release the claw 31 from the female connector body 77, realizing the quick disassembly of the male connector and the free-grip connector. At the same time, it realizes the separation of the terminal block and the terminal ring, so that the circuit between the terminal block and the terminal ring is disconnected. By setting the fourth oil guide hole 95, the first balance hole 93, the second balance hole 94, the guide hole, the liquid guide hole and the balance piston 86 are connected to the short section 2. After passing through the second balance hole 94 and the first balance hole 93, the well fluid acts on the lower end face of the balance piston 86. At the same time, the silicone oil between the isolation plug 81 and the upper end face of the balance piston 86 acts on the upper end face of the balance piston 86. The up and down movement of the balance piston 86 achieves pressure balance between the silicone oil and the well fluid, so that the well fluid and the inner side of the connecting ring body and the silicone oil and the outer side of the connecting ring body have a balanced force state, maintaining the normal structural and functional state of the connecting ring body and improving its working life. The setting of the guide hole can increase the storage space of silicone oil, and at the same time, it allows the isolation plug 81 to move up and down to maintain the pressure balance between the silicone oil and the well fluid.

[0075] The above-mentioned free-release connector can be further optimized and / or improved according to actual needs:

[0076] As attached Figure 11As shown, the connector body includes an outer conductive ring 88, an outer insulating ring 89, and a grounding ring 90. Three outer insulating rings 89 corresponding to the inner insulating ring 36 are arranged at intervals on the inner side of the sheath 83. The uppermost outer insulating ring 89 is sealed and fixedly installed with the lower end of the female connector body 77. The lowermost outer insulating ring 89 is sealed and fixedly installed with the upper end of the grounding ring 90 located inside the conductor cap 84. An outer conductive ring 88 in contact with the inner conductive ring 37 is sealed and fixedly installed between each two adjacent outer insulating rings 89. There is a gap between the outer side of each outer conductive ring 88 and the outer side of each outer insulating ring 89 and the inner side of the sheath 83.

[0077] As required, the inner side of the sheath 83 is provided with a sealing sleeve whose upper end is fixed to the lower end of the female connector body 77. The lower end of the sealing sleeve is fixedly installed to the upper end of the grounding ring 90. The sealing sleeve has two through holes that are spaced apart vertically and communicate with each other. The outer conductive ring 88 is fixedly installed in the through holes. The upper and lower sides of each outer conductive ring 88, corresponding to the position between the sealing sleeve and the sheath 83, are fixedly installed with outer insulating rings 89. During use, there is a gap between the outer side of each outer conductive ring 88 and the outer side of each outer insulating ring 89 and the inner side of the sheath 83, so that the outer conductive ring 88 has better elastic deformation space, which can make the outer conductive ring 88 and the inner conductive ring 37 contact better under the pressure of the well fluid, and improve the conductivity when the terminal ring body and the terminal post are connected.

[0078] As attached Figure 9 , 10 As shown in Figure 11, an anti-drainage plug 72 is sealed and fixedly installed between the upper inner side of the central connector 67 and the upper outer side of the push-pull rod 65. The lower end of the anti-drainage plug 72 is provided with an eighth wire passage that runs vertically through the lower end. A cable connector 98 is sealed and fixedly installed in the eighth wire passage. A straightening ring 73 is fixedly installed on the outer side of the central connector 67 corresponding to the position of the anti-drainage plug 72.

[0079] Depending on the requirements, the straightening ring 73 is a known existing technology, such as the split-type straightener 23, and the cable connector 98 is a known existing technology, such as a copper plug. During use, the straightening ring 73 serves as a guide when the connector housing 54 is lowered into the connecting section 2, and the cable connector 98 facilitates the connection and maintenance of the cables above and below the anti-pollution head 72.

[0080] As attached Figure 10 As shown, a connecting tube 64, which is fitted onto the lower outer side of the lead screw 71, is fixedly installed on the inner side of the lower end of the lead screw 69. The inner side of the lower end of the connecting tube 64 is fixedly installed together with the outer side of the upper end of the push-pull rod 65.

[0081] During use, the connecting pipe 64 can guide and limit the push-pull rod 65.

[0082] As attached Figure 9 , 10 As shown, the transmission mechanism includes a coupling 60, a lower mounting sleeve 61, and an upper mounting sleeve 62. The lower mounting sleeve 61, which is fitted inside the connector housing 54, is fixedly installed on the inner side of the upper end of the anti-rotation block 68. At least two second bearings 63 are distributed vertically between the inner side of the lower mounting sleeve 61 and the outer side of the upper part of the lead screw 71. A motor cylinder 57 is sealed between the drive motor 55 and the connector housing 54. The upper mounting sleeve 62 is fixedly installed between the lower end of the motor cylinder 57 and the upper end of the lower mounting sleeve 61. A coupling 60 is provided inside the upper mounting sleeve 62. The lower end of the output shaft 56 is connected to the upper end of the lead screw 71 through the coupling 60.

[0083] During use, this configuration facilitates the transmission connection between the output shaft 56 and the lead screw 71, and also makes subsequent maintenance easier.

[0084] As attached Figure 9 , 10 As shown in Figure 14, a lower limit switch 58 corresponding to the limit pin 70 is fixedly installed on the lower part of the limit slide 91, and an upper limit switch 59 is fixedly installed on the upper part of the limit slide 91 above the lower limit switch 58. The output terminals of the lower limit switch 58 and the upper limit switch 59 are both electrically connected to the input terminal of the drive motor 55.

[0085] As required, both the upper limit switch 59 and the lower limit switch 58 are existing technologies, and the distance between them is no greater than the length of the limit groove 91. During use, this configuration controls the travel of the nut 69, which in turn controls the travel of the clamp 66, enabling rapid and precise connection between the male connector and the free-release connector, ensuring reliable operation.

[0086] As attached Figure 11 As shown, a guide rod 87 is fixedly installed at the center of the lower end of the balance piston 86.

[0087] During use, the guide rod 87 can play a guiding role, so that the well fluid entering the lower inner side of the oil storage sleeve 78 through the fourth oil guide hole 95 acts on it and makes it slide up and down, preventing the balance piston 86 from overturning and getting stuck in the oil storage sleeve 78.

[0088] As attached Figure 9 As shown, the upper end of the mating section 2 is located above the connector housing 54.

[0089] During use, this setup provides a suitable working environment for the clamp 66 and the female connector body 77 to release or grip the claw 31, improving the stability and reliability of the release and gripping operations.

[0090] The method for logging operations on horizontal sections of oil wells using a free-release connector to release logging instruments over the drill bit includes the following steps:

[0091] The first step is to connect the suspension sub 3 between the drill pipe and the drill bit with the central water inlet, and send it down into the well along with the drill string until the drill bit reaches the horizontal section to be measured. Then, remove the traveling block, hook, etc., and disconnect the connection between the drill string and the drilling rig.

[0092] The second step is to perform ground operations. Place the female connector body 77 in the gripper cylinder 20, so that the outer conductive ring 88 of the wiring ring body is connected to the inner conductive ring 37 of the corresponding position of the wiring post. Use a high torque motor to control the sleeve 66 to move down and tighten it on the outside of the gripper cylinder 20, so that the female connector body 77 and the connecting male connector are fixedly connected as one. Suspend the upper end of the connector shell 54 on the logging head, and after the lower end of the support cylinder 1 is connected to the drill bit logging instrument, it is moved to the wellhead of the oil well.

[0093] The third step is to insert the free release connector connected to the over-drill bit logging instrument into the water hole of the drill tube and keep it slowly lowered. When the over-drill bit logging instrument reaches the horizontal section, the surface pump is started to push the over-drill bit logging instrument forward in the horizontal section until it passes through the drill bit and reaches the preset logging initial position, and the support component is attached to the first support surface 12 of the suspension cylinder 4.

[0094] Fourth step, connect the instrument cable, extend the caliper leg and density instrument leg of the logging instrument through the drill bit, connect the motor cable, start the drive motor 55, drive the clamp 66 to move upward, loosen the clamp restriction on the grab barrel 20, then apply force to pull the suspension cable, disconnect the clamp between the female connector body 77 and the grab barrel 20, disconnect the connection between the female connector body 77 and the connecting male connector, continue to slowly pull the cable to lift the female connector body 77 out of the well and place it at the wellhead for later use;

[0095] The fifth step is to connect the drill pipe to the drilling rig, start the drilling rig to lift the drill pipe, perform storage logging on the horizontal well section downhole, and disconnect the drill pipe from the drilling rig after logging is completed.

[0096] The sixth step is to lower the connector housing 54 into the drill pipe water hole again by suspending it from the head of the drill bit and keep it slowly. Relying on its own weight to overcome the elastic force at the end of the gripper 20, the female connector body 77 enters and is locked into the gripper 20. The motor cable is connected, the drive motor 55 is started, and the drive sleeve 66 is driven to move down and is tightly fitted on the outside of the gripper 20, so that the female connector body 77 and the connecting male connector are fixedly connected as one unit again.

[0097] Step 7: Connect the instrument cable, retract the caliper leg and density leg of the over-the-bit logging instrument, apply force again to lift the suspension cable, and pull the free release connector and over-the-bit logging instrument slowly upwards until they are lifted to the surface at the wellhead to complete the logging operation.

[0098] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A male connector, characterized in that... The device includes a male gun body, a male connector sleeve, a terminal block, a gripper, a piston rod, and a downhole docking tool. The downhole docking tool includes a support cylinder, a docking sub, a suspension sub, a suspension cylinder, and a support assembly. A hollow suspension cylinder is rotatably mounted on the inner side of the upper part of the suspension sub. The inner side of the upper end of the suspension cylinder has a first conical support surface that is larger at the top and smaller at the bottom. The inner side of the upper end of the suspension sub, which is located above the suspension cylinder, is fixedly installed together with the outer side of the lower end of the docking sub. A support cylinder is installed inside the suspension cylinder, with its lower end located inside the lower end of the suspension sub. The upper end of the support cylinder is located inside the lower part of the docking sub. A first through-channel is provided in the center of the upper end of the support cylinder. A first cable connection assembly is fixedly installed on the inner side of the lower end of the support cylinder. A support assembly with a lower end face matching the first support surface is installed on the outer side of the lower part of the suspension cylinder, which is located at the lower end of the docking sub. The support assembly includes a front support block and a rear support block symmetrically fixedly installed on the outside of the support cylinder. The cross-section of the front support block and the rear support block on the horizontal plane is a semi-circular ring, and the cross-section of the front support block and the rear support block on the vertical plane is an isosceles trapezoid with a larger outer diameter and a smaller inner diameter. The lower ends of the front support block and the rear support block form a second support surface that matches the first support surface. The left front side and the right front side of the rear support block each have two front-to-back connecting screw holes spaced vertically. The rear side of the front support block corresponding to each connecting screw hole position has a connecting through hole that runs through the front and rear. The rear support block and the front support block are fixed together by connecting bolts that are screwed into the corresponding connecting screw holes after the screw ends pass through the connecting through holes. Both the front support block and the rear support block are provided with several vertically connected guide channels at intervals; the left front side and the right front side of the rear support block are provided with two rear pin holes at intervals; the rear side of the front support block is provided with a front pin hole corresponding to each rear pin hole position; and each front pin hole is provided with a positioning pin whose rear end is tightly fitted into the corresponding rear pin hole. The upper inner side of the suspension short section is provided with a lower step surface, and a first bearing is installed on the lower step surface. The suspension cylinder is coaxially arranged on the upper end of the first bearing. Several vertical support ribs are distributed along the circumference on the inner side of the upper end of the suspension cylinder. The first cable connection assembly includes a first plug and a first socket that cooperate with each other. The first plug and the first socket are fixedly installed on the inner side of the lower end of the support cylinder from top to bottom. The main body of the male gun has a second through-channel for wiring. A guide head is located at the top of the main body. A terminal block is sealed and fixedly installed between the inner lower end of the guide head and the inner upper end of the main body. A gripper cylinder, with its upper end above the guide head, is fixedly installed on the outer upper part of the main body. Several upward-opening, interconnected telescopic grooves are evenly distributed along the circumference of the outer lower part of the gripper cylinder. A J-shaped chuck, with its upper end above the gripper cylinder, is fixedly installed between the inner upper end of each pair of adjacent telescopic grooves on the outer upper part of the gripper cylinder. A centralizer is coaxially fitted on the outer upper part of the main body below the gripper cylinder. The outer lower end of the main body is sealed and fixedly installed together with the inner upper end of the male connector sleeve. The inner lower end of the male connector sleeve is sealed and fixedly installed together with the outer upper end of the support cylinder of the downhole docking tool. A second socket is fixedly installed on the inner upper end of the support cylinder. A connector is sealed and fixedly installed on the inner lower end of the male connector sleeve to the second socket. The second plug and the male connector sleeve above the second plug are coaxially fitted with a piston rod whose upper end is fixedly installed with the inner side of the lower end of the male gun body. The piston rod has a third through-hole that runs vertically through it. Several first oil guide holes that are evenly distributed around the circumference of the upper outer side of the piston rod are connected internally and externally. A second oil guide hole that runs radially through the lower outer side of the male gun body is provided at the position of each first oil guide hole. A piston head that is fixed to the lower outer side of the piston rod and is in sealing contact with the inner side of the male connector sleeve is fixedly installed. A piston ring is sealed between the inner side of the male connector sleeve and the outer side of the piston rod at the position between the piston head and the lower end of the male gun body. A tension spring that is fitted on the upper outer side of the piston rod is fixedly installed between the upper end of the piston ring and the lower end of the male gun body. Several third oil guide holes that are connected internally and externally are evenly distributed around the circumference of the inner side of the male connector sleeve at the upper end of the piston head.

2. The male connector according to claim 1, characterized in that... The terminal block includes a connecting rod, an inner insulating ring, and an inner conductive ring. A first connecting ring platform is fixed to the inner side of the upper end of the male gun body. The outer side of the upper end and the outer side of the lower end of the connecting rod are respectively fixedly installed on the inner side of the guide head and the inner side of the first connecting ring platform. Three inner insulating rings are arranged at intervals on the outer side of the connecting rod. The lower end of the inner insulating ring located at the bottom is sealed and fixedly installed with the upper end of the male gun body. The outer side of the upper end of the inner insulating ring located at the top is sealed and in contact with the inner side of the lower end of the guide head. An inner conductive ring is sealed and fixedly installed between each two adjacent inner insulating rings. There is a gap between the inner side of each inner conductive ring and between the inner side of each inner insulating ring and the outer side of the connecting rod. At least one fourth oil guide hole is evenly distributed along the circumference on the lower end face of the first connecting ring platform; or / and, a tapered guide surface with a smaller upper part and a larger lower part is provided on the outer side of the upper end of the guide head; or / and, the centralizer is a spring centralizer. An upper ring groove and a lower ring groove are arranged at intervals on the outer side of the upper part of the male gun body. The outer side of the upper end and the outer side of the lower end of the centralizer are slidably installed in the upper ring groove and the lower ring groove, respectively.

3. The male connector according to claim 1 or 2, characterized in that... The male connector sleeve has an upper connecting hole, an upper adjusting hole, a lower adjusting hole, an upper mounting hole, a lower mounting hole, and a lower connecting hole connected sequentially from top to bottom. The lower outer side of the male gun body is sealed and fixedly installed on the upper part of the upper connecting hole. The piston ring is sealed and installed in the upper adjusting hole. The piston head is sealed and installed in the lower adjusting hole. The upper outer side of the support cylinder is sealed and fixedly installed on the lower part of the lower connecting hole. A fixing sleeve is installed on the inner side of the upper part of the lower connecting hole corresponding to the position above the support cylinder. The second plug is fixedly installed on the inner side of the lower part of the fixing sleeve. A third socket, fitted into the lower mounting hole, is fixedly installed on the upper end of the fixing sleeve. A third plug that mates with the third socket is sealed and fixedly installed inside the mounting hole. An upper step surface is formed between the upper adjustment hole and the lower adjustment hole. Four third oil guide holes are evenly distributed along the circumference on the upper step surface, inclined from top to bottom and from the inside to the outside. Or / and, at least one radially penetrating upper oil injection hole is provided on the lower outer side of the male gun body corresponding to the position above the male connector connecting sleeve. An upper oil injection plug is sealed and fixedly installed in each upper oil injection hole. At least one lower oil injection hole communicating with the lower adjustment hole is provided on the middle outer side of the male connector connecting sleeve. A lower oil injection plug is sealed and fixedly installed in each lower oil injection hole.

4. A free-release connector using a male connector as described in any one of claims 1 to 3, comprising a connector housing, a drive motor, a transmission mechanism, a central connector, a slotted connector, a female connector body, a wiring ring body, and a male connector. The connector housing, the central connector, and the slotted connector are coaxially and fixedly installed on the inner side of the upper part of the mating section of the male connector from top to bottom. The drive motor is sealed and fixedly installed on the inner side of the upper part of the connector housing. The drive motor has an output shaft at its lower end. An anti-rotation block with its upper end located below the drive motor is fixedly installed on the inner side of the upper end of the central connector. A vertically penetrating slide rail is provided at the center of the upper end of the anti-rotation block. A nut is slidably installed along the vertical direction inside the slide rail. A strip-shaped limiting groove with internal and external communication is provided on both the left and right sides of the middle part of the anti-rotation block. Each limiting groove has an end... A limiting pin is fixedly installed at a position corresponding to the outer side of the screw nut. A push-pull rod with a lower end seal passing through the central connector is fixedly installed on the inner side of the lower end of the screw nut. A screw rod is screwed to the inner side of the upper end of the screw nut. The upper end of the screw rod is connected to the lower end of the output shaft through a transmission mechanism located inside the connector housing. A radially penetrating strip-shaped lifting hole is provided on the outer side of the slotted connector at the position below the central connector. A radial support rod with both ends located on the outer side of the slotted connector passes through the lower part of the lifting hole. A vertically penetrating fixing hole is provided in the middle of the radial support rod. The lower outer side of the push-pull rod is fixedly installed in the fixing hole. A sleeve with its upper inner side fixedly installed together with both ends of the radial support rod is provided on the outer side of the lower part of the slotted connector. The upper end of the oil reservoir sleeve fitted inside the sleeve at the lower end of the slotted connector and the upper outer side is sealed. The components are fixedly installed together. A second connecting ring is fixed to the inner side of the lower end of the slotted joint. An isolation plug is sealed and installed on the inner side of the middle part of the oil reservoir sleeve. A protective tube with its upper end close to the lower end of the second connecting ring is fixedly installed on the upper end of the isolation plug. A guide hole is provided at the upper end of the isolation plug. The lower end of the push-pull rod passes through the second connecting ring and is located on the inner side of the lower part of the protective tube. A female connector body with its lower end located below the hoop is fixedly installed on the inner side of the lower end of the oil reservoir sleeve corresponding to the position below the isolation plug. A piston rod is fixed to the center of the upper end of the female connector body. A fourth oil guide hole is provided at the center of the upper end of the piston rod, extending to the lower end of the female connector body. A piston cap is fixedly installed on the outer side of the upper end of the piston rod. Several through holes are distributed at intervals on the upper end of the piston cap. Several interconnected first balance holes are evenly distributed around the circumference. A balance piston is sealed and installed on the inner side of the upper part of the fourth oil guide hole. The outer side of the upper part of the guide head is coaxially fitted onto the inner side of the lower part of the fourth oil guide hole. A second balance hole is provided on the outer side of the lower part of the sleeve corresponding to the position of each first balance hole. An outer ring groove matching the claw of the connecting male connector is provided on the outer side of the female connector body below the first balance hole. Each claw is engaged in the groove formed by the lower end of the sleeve and the outer ring groove. A protective sleeve is sealed and fixedly installed on the outer side of the lower end of the female connector body. A guide cap fitted onto the outer side of the upper end of the male gun body is sealed and fixedly installed on the outer side of the lower end of the protective sleeve. A wire ring body with a gap between its outer side and the inner side of the protective sleeve, matching the wire post of the connecting male connector, is fixedly installed on the lower end of the female connector body.The lower end of the female connector body corresponding to the position between the terminal block and the sheath has a fourth through-path for wiring; the lower end of the isolation plug has a fifth through-path for wiring; the lower end of the slotted connector has a sixth through-path for wiring; the lower end of the central connector corresponding to the sixth through-path has a seventh through-path for wiring, connecting the inside and outside; and a sealing connector is fixedly installed on the inner side of the upper part of the connector housing corresponding to the position above the drive motor.

5. The free-release connector according to claim 4, characterized in that... The connector body includes an outer conductive ring, an outer insulating ring, and a grounding ring. Three outer insulating rings, corresponding to the inner insulating rings, are spaced vertically on the inner side of the sheath. The uppermost outer insulating ring is sealed and fixedly installed at its upper end to the lower end of the female connector body. The lowermost outer insulating ring is sealed and fixedly installed at its lower end to the upper end of the grounding ring located inside the conductor cap. An outer conductive ring in contact with the inner conductive ring is sealed and fixedly installed between each pair of adjacent outer insulating rings. A gap is provided between the outer side of each outer conductive ring and between the outer side of each outer insulating ring and the inner side of the sheath. Alternatively, an anti-pollution plug is sealed and fixedly installed between the upper inner side of the central connector and the upper outer side of the push-pull rod. The lower end of the anti-pollution plug has an eighth through-channel, and a cable connector is sealed and fixedly installed within the eighth through-channel. A straightening ring is fixedly installed on the outer side of the central connector corresponding to the anti-pollution plug position. Alternatively, a connecting tube fitted onto the lower outer side of the lead screw is fixedly installed on the lower inner side of the nut. The lower inner side of the connecting tube is fixedly installed together with the upper outer side of the push-pull rod.

6. The free-release connector according to claim 4 or 5, characterized in that... The transmission mechanism includes a coupling, a lower mounting sleeve, and an upper mounting sleeve. A lower mounting sleeve, fitted inside the connector housing, is fixedly installed on the inner side of the upper end of the anti-rotation block. At least two second bearings are spaced vertically between the inner side of the lower mounting sleeve and the outer side of the upper part of the lead screw. A motor cylinder is sealed between the drive motor and the connector housing. An upper mounting sleeve is fixedly installed between the lower end of the motor cylinder and the upper end of the lower mounting sleeve. A coupling is installed inside the upper mounting sleeve. The lower end of the output shaft is connected to the upper end of the lead screw via the coupling. Alternatively, a lower limit switch corresponding to the limit pin is fixedly installed on the lower part of the limit groove. An upper limit switch is fixedly installed on the upper part of the limit groove above the lower limit switch. The output ends of both the lower and upper limit switches are electrically connected to the input end of the drive motor. Alternatively, a guide rod is fixedly installed at the center of the lower end of the balance piston. Alternatively, the upper end of the docking short section is located above the connector housing.

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