Downhole instrument rotation unit

Abstract

The present invention relates to the technical field of downhole directional perforating, and is a downhole instrument rotation unit comprising an upper joint, a motor connecting shaft, and a rotating motor. A motor connecting cylinder with its upper end located above the motor connecting shaft is sleeved on the outside of the motor connecting shaft, and a first mounting groove and a second mounting groove with an upward opening and successively decreasing inner diameters are provided in the middle of the upper end of the motor connecting shaft from top to bottom. The present invention has a reasonable and compact structure and is easy to use. The upper joint is driven to rotate by the motor and the motor connecting shaft, and the directional perforating tool string is driven to rotate by the upper joint, thereby increasing the accuracy of its rotation angle. The wire is transmitted to the socket by the cooperation of the pins, conductive rods, and slip rings provided inside the upper joint, thereby preventing the wire from twisting and entanglement. The socket is provided to quickly connect to the instrument below it, and the invention has the characteristics of safety, labor saving, simplicity, and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of downhole directional perforation, and relates to a downhole instrument rotating unit. Background Art

[0002] Currently, in the field of directional perforating, horizontal wells generally use the gravity method to rotate the perforating charge rack so that the perforating charge is oriented in the designed direction. Vertical wells use gyroscope orientation and then manually rotate the tool string on the ground to align the perforating charge with the designed direction. However, both methods use indirect methods to rotate the tool string, which has the problem of low rotation angle accuracy.

[0003] The Chinese patent with publication number CN209195375U discloses a directional perforating tool string, comprising: a perforating gun (1) and an igniter (2) connected to one end of the perforating gun (1); characterized in that the perforating gun (1) comprises: an ammunition rack body (11), a plurality of loading holes (1101) are opened on the side wall of the ammunition rack body (11); an upper rotating bearing (12) and a lower rotating bearing (13) are respectively arranged at both ends of the ammunition rack body (11); a deflecting weight (14) is arranged on the side wall of one side of the ammunition rack body (11), and the deflecting weight (14) is arranged on the side wall of the ammunition rack body (11). At least one of the plurality of loading holes (1101) is oriented to face a direction within a range of 180° horizontally or below the horizontal under the action of gravity; an ammunition bag is installed in each of the at least one loading hole (1101); a fuse (15) connected to the ammunition bag; and a perforating gun body (16) is sleeved on the outside of the ammunition rack body (11), the upper rotating bearing (12), the lower rotating bearing (13), the deflecting weight (14), the ammunition bag and the fuse (15); wherein the fuse (15) is connected to the igniter (2). This patent sets a lateral weight block 14 on one side wall of the ammunition rack body 11, and sets an upper rotating bearing 12 and a lower rotating bearing 13 at both ends of the ammunition rack body 11. Under the action of gravity, the lateral weight block 14 can drive the ammunition rack body 11 to rotate through the upper rotating bearing 12 and the lower rotating bearing 13, so that at least one loading hole 1101 can be oriented to a position within a range of 180° horizontally or below the horizontal, thereby realizing directional perforating, and adopts a gravity method to rotate the perforating ammunition rack.

[0004] The Chinese patent with publication number CN114482941A discloses an angle-controllable directional perforating and slitting integrated device, comprising a housing (1) and a directional injection device (2) arranged inside the housing (1), wherein the directional injection device (2) is provided with a nozzle (4), and a groove is circumferentially opened at a corresponding position of the housing (1) corresponding to the nozzle (4); the characteristic is that the directional injection device (2) comprises a turbine blade (3) and a directional injection device (5) fixedly connected to the turbine blade (3), the directional injection device (5) comprises a directional injection device body and an elastic member (8), a steel ball (7) and a first limiting member (6) all arranged inside the directional injection device body, the housing (1) is provided with a second limiting member (9), one end of the elastic member abuts against the steel ball (7), and the other end abuts against the second limiting member (9), and the other end of the steel ball (7) abuts against the first limiting member (6). This patent uses high-pressure water flow to drive the turbine blades (3) to drive the control device (5) at the lower end to rotate a certain angle and shoot the high-pressure water flow toward the borehole wall to achieve directional perforation. This control method has low controllability. Summary of the Invention

[0005] The present invention provides a downhole instrument rotation unit, which overcomes the above-mentioned shortcomings of the prior art and can effectively solve the problem of low rotation angle accuracy during the existing directional perforating.

[0006] The technical solution of the present invention is achieved through the following measures: a downhole instrument rotating unit, including an upper joint, a motor connecting shaft and a rotating motor, the outer side of the motor connecting shaft is provided with a motor connecting cylinder with the upper end located above it, the middle part of the upper end of the motor connecting shaft is provided with a first mounting groove and a second mounting groove with an opening upward and an inner diameter decreasing successively from top to bottom, the upper joint is transmitted and connected in the first mounting groove, the outer side of the lower part of the upper joint is provided with a rotating cylinder body installed together with the outer side of the lower end and the inner side of the upper end of the motor connecting cylinder, a stepped hole is provided in the upper joint, a pin insulating sleeve is fixedly installed in the stepped hole, a pin is provided in the pin insulating sleeve, the lower end of the pin is connected to a conductive rod with the lower end located in the second mounting groove, a third mounting groove which passes through the second mounting groove is provided on the motor connecting shaft corresponding to the lower end position of the conductive rod, a slip ring conductive column located inside the third mounting groove is installed on the outer side of the lower end of the conductive rod, a slip ring insulating ring located inside the third mounting groove is installed on the outer side of the slip ring conductive column, the lower part of the motor connecting shaft corresponding to the position below the conductive rod A first insulating ring is sleeved on the outside, and a second insulating ring and a conductive ring are sleeved on the outside of the lower end of the first insulating ring in sequence from bottom to top. A limiting groove that passes through inside and outside is provided on the motor connecting tube corresponding to the outer position of the conductive ring, and an insulating block is fixedly installed on the outside of the limiting groove. A limiting hole that passes through inside and outside is provided in the middle of the insulating block, and a conductive spring clip whose inner end contacts the conductive ring is provided. A first wire groove opening outward is provided on the motor connecting shaft corresponding to the position between the conductive spring clip and the slip ring conductive column, and a cable located in the first wire groove is provided between the slip ring conductive column and the conductive spring clip. The lower end of the motor connecting shaft is connected to the upper end of the rotating motor through a coupling, a motor front seat is installed on the outside of the upper end of the rotating motor, and the outer side of the upper end of the motor front seat is fixedly installed together with the inner side of the lower end of the motor connecting tube. A socket is provided at the lower end of the rotating motor, a second wire groove is provided on the rotating motor casing, and a wiring hole that passes through inside and outside is provided on the lower part of the rotating motor casing. The first end of the cable is connected to the conductive spring clip, and the second end of the cable is connected to the motor and the inside of the socket through the second wire groove and the wiring hole.

[0007] The following are further optimizations and / or improvements to the above technical solutions:

[0008] The above also includes a rotating transformer, which is provided on the motor connecting shaft corresponding to the lower side of the second insulating ring. The signal line of the rotating transformer is connected to the socket through the second wire groove, and a rotating transformer clamping nut is fixedly installed on the motor connecting shaft corresponding to the lower side of the rotating transformer.

[0009] A bearing pressure block, a first needle roller radial bearing, a radial bearing pressure ring, and a second needle roller radial bearing are sequentially arranged between the outer side of the lower end of the insulating cylinder and the rotating cylinder from bottom to top.

[0010] A supporting outer ring platform is provided at the upper end of the above-mentioned motor connecting shaft, and a supporting inner ring platform is provided on the inner side of the motor connecting cylinder corresponding to the lower side of the supporting outer ring platform. A first needle roller thrust bearing mounted on the motor connecting shaft is provided between the lower side of the supporting outer ring platform and the upper side of the supporting inner ring platform, and a second needle roller thrust bearing mounted on the outer side of the upper end of the motor connecting shaft is provided between the upper side of the supporting outer ring platform and the lower end of the rotating cylinder.

[0011] An insulating pad fixed to the outside of the conductive rod is provided at the bottom of the first mounting groove.

[0012] The above also includes a sealing ring and a grounding spring, and a sealing ring and a grounding spring are respectively provided at upper and lower intervals between the rotating cylinder and the middle part of the upper joint.

[0013] The above also includes a shock-absorbing ring, and the outer side of the upper part of the upper joint, the outer side of the lower part of the motor connecting tube, and the outer side of the socket are all provided with a shock-absorbing ring.

[0014] The present invention has a reasonable and compact structure and is easy to use. It drives the upper joint to rotate by setting a motor and a motor connecting shaft, and drives the directional perforating tool string to rotate through the upper joint, thereby increasing the accuracy of its rotation angle. The pins, conductive rods and slip rings set inside the upper joint cooperate to transmit the wire to the socket, avoiding twisting and entanglement of the wire. The socket is set to quickly connect with the instrument below it, which has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attachment Figure 1 It is a schematic diagram of the main structure of the present invention.

[0016] Attachment Figure 2 For attachment Figure 1 Schematic diagram of the main cross-sectional structure.

[0017] Attachment Figure 3 For attachment Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0018] Attachment Figure 4 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the middle and lower parts.

[0019] The codes in the attached drawings are: 1 for the pin, 2 for the pin insulating sleeve, 3 for the upper connector, 4 for the conductive rod, 5 for the sealing ring, 6 for the rotating cylinder, 7 for the grounding spring, 8 for the first needle roller radial bearing, 9 for the radial bearing pressure ring, 10 for the bearing pressure block, 11 for the motor connecting cylinder, 12 for the insulating block, 13 for the motor connecting shaft, 14 for the insulating spacer, 15 for the slip ring insulating ring, 16 for the first needle roller thrust bearing, 17 for the slip ring conductive column, 18 for the first An insulating ring, 19 is a conductive ring, 20 is a second insulating ring, 21 is a rotary transformer, 22 is a rotary transformer tightening nut, 23 is a coupling, 24 is a rotary motor, 25 is a motor front seat, 26 is a heat sink, 27 is a socket, 28 is a shock absorber ring, 29 is a second needle roller radial bearing, 30 is a second needle roller thrust bearing, 31 is a first wire groove, 32 is a second wire groove, 33 is a wiring hole, 34 is a support outer ring platform, and 35 is a conductive spring. DETAILED DESCRIPTION

[0020] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0021] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0022] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0023] Example 1: As shown in the attached Figure 1 、 2As shown in Figures 3 and 4, the downhole instrument rotation unit includes an upper joint 3, a motor connecting shaft 13 and a rotating motor 24. The outer side of the motor connecting shaft 13 is provided with a motor connecting cylinder 11 with its upper end located above it. The middle part of the upper end of the motor connecting shaft 13 is provided with a first mounting groove and a second mounting groove with an upward opening and an inner diameter decreasing from top to bottom. The upper joint 3 is connected to the first mounting groove for transmission. The outer side of the lower part of the upper joint 3 is provided with a rotating cylinder 6 installed together with the outer side of the lower end and the inner side of the upper end of the motor connecting cylinder 11. A stepped hole is provided in the upper joint 3, and a pin is fixedly installed in the stepped hole. Insulating sleeve 2, pin insulating sleeve 2 is provided with pin 1, the lower end of pin 1 is connected to the conductive rod 4 with the lower end located in the second mounting groove, the motor connecting shaft 13 corresponding to the lower end of the conductive rod 4 is provided with a third mounting groove that passes through the second mounting groove, the outer side of the lower end of the conductive rod 4 is provided with a slip ring conductive column 17 located inside the third mounting groove, the outer side of the slip ring conductive column 17 is provided with a slip ring insulating ring 15 located inside the third mounting groove, the outer side of the lower part of the motor connecting shaft 13 corresponding to the position below the conductive rod 4 is provided with a first insulating ring 18, the outer side of the lower end of the first insulating ring 18 is provided with a From bottom to top, a second insulating ring 20 and a conductive ring 19 are sequentially mounted. A limiting groove extending inside and outside is provided on the motor connecting tube 11 corresponding to the outer position of the conductive ring 19. An insulating block 12 is fixedly installed on the outer side of the limiting groove. A limiting hole extending inside and outside is provided in the middle of the insulating block 12. A conductive spring 35 whose inner end contacts the conductive ring 19 is provided in the limiting hole. A first wire groove 31 opening outward is provided on the motor connecting shaft 13 corresponding to the position between the conductive spring 35 and the slip ring conductive column 17. A cable located in the first wire groove 31 is provided between the slip ring conductive column 17 and the conductive spring 35. The lower end of the motor connecting shaft 13 is connected to the upper end of the rotating motor 24 through a coupling 23. A motor front seat 25 is installed on the outer side of the upper end of the rotating motor 24. The outer side of the upper end of the motor front seat 25 is fixedly installed with the inner side of the lower end of the motor connecting tube 11. A socket 27 is provided at the lower end of the rotating motor 24, and a second wire groove 32 is provided on the outer shell of the rotating motor 24. A wiring hole 33 that passes through the inside and outside of the outer shell of the rotating motor 24 is provided. The first end of the cable is connected to the conductive spring piece 35, and the second end of the cable is connected to the lower end of the motor and the inside of the socket 27 through the second wire groove 32 and the wiring hole 33.

[0024] If required, socket 27 can utilize a seven-core connector. This allows for quick connection to the lower instrument, enabling rapid disconnection and insertion during maintenance and repair. Because rotating cylinder 6 and upper connector 3 rotate relative to each other, grease is applied to the inner side of the upper end of rotating cylinder 6 before each trip to the wellbore. This reduces friction during rotation. Several heat sinks 26 are circumferentially located on the outer shell of rotating motor 24 to aid in rapid heat dissipation and prevent cable damage caused by high temperatures.

[0025] During use, the pin 1 in the upper connector 3 is connected to the conductive rod 4 to transmit power downward, and the electricity inside the upper connector 3 is introduced to the outside through the slip ring conductive column 17. The slip ring conductive column 17 is provided with a terminal. After the terminal is connected, it passes through the first wire groove 31 and is connected to the conductive ring 19. The conductive spring 35 provided on the outside of the conductive ring 19 is restricted by the limit hole. The conductive ring 19 rotates relative to the conductive spring 35, while the conductive spring 35 remains relatively stationary with the motor connecting tube 11, thereby avoiding the entanglement of the wires. The conductive spring 35 is connected to the conductive spring 35. The wire leads the electricity to the motor and the socket 27 through the second wire groove 32, realizing the downward transmission of the wire and preventing it from being entangled when the rotating part rotates; the motor drives the motor connecting shaft 13 to rotate through the coupling 23, and the motor connecting shaft 13 drives the upper connector 3 to rotate. The upper connector 3 can drive the directional perforating tool string to rotate. By controlling the rotation of the motor, the rotation angle of the directional perforating tool string can be controlled, thereby improving its rotation accuracy and increasing its controllability.

[0026] The above-mentioned downhole instrument rotation unit can be further optimized and / or improved according to actual needs:

[0027] Example 2: As shown in the attached Figure 1 、 2 As shown in Figures 3 and 4, the rotary transformer 21 is also included. The rotary transformer 21 is provided on the motor connecting shaft 13 corresponding to the lower side of the second insulating ring 20. The conductive spring 35 is connected to the rotary transformer 21. The signal line of the rotary transformer 21 is connected to the socket 27 through the second wire groove 32. A rotary transformer compression nut 22 is fixedly installed on the motor connecting shaft 13 corresponding to the lower side of the rotary transformer 21. During use, the rotary transformer 21 is provided to obtain the rotation angle of the motor connecting shaft 13, and the angle information is transmitted to the downhole instrument through the signal line. In combination with other control units, the motor start and stop are controlled, thereby accurately controlling the rotation angle of the directional perforating tool string.

[0028] Example 3: As shown in the attached Figure 1 、 2 As shown in Figures 3 and 4, a bearing block 10, a first needle roller radial bearing 8, a radial bearing pressure ring 9, and a second needle roller radial bearing 29 are sequentially provided between the outer side of the lower end of the insulating cylinder and the rotating cylinder 6 from bottom to top. The friction between the rotating cylinder 6 and the upper joint 3 is reduced by providing the bearings.

[0029] Example 4: As shown in the attached Figure 1 、 2As shown in Figures 3 and 4, an outer support ring 34 is provided at the upper end of the motor connecting shaft 13. An inner support ring 34 is provided on the inner side of the motor connecting cylinder 11, corresponding to the lower side of the outer support ring 34. A first needle roller thrust bearing 16, which is mounted on the motor connecting shaft 13, is provided between the lower side of the outer support ring 34 and the upper side of the inner support ring. A second needle roller thrust bearing 30, which is mounted on the outer side of the upper end of the motor connecting shaft 13, is provided between the upper side of the outer support ring 34 and the lower end of the rotating cylinder 6. By providing bearings to support the motor connecting shaft 13, friction between the motor connecting shaft 13, the motor connecting cylinder 11, and the rotating cylinder 6 is reduced.

[0030] Example 5: As shown in the attached Figure 1 、 2 As shown in Figures 3 and 4, the bottom of the first mounting groove is provided with an insulating spacer 14 fixed to the outside of the conductive rod 4. When in use, the insulating spacer 14 can support and limit the shaking of the conductive rod 4 to prevent its outer side from contacting the motor connecting shaft 13.

[0031] Example 6: As shown in the attached Figure 1 、 2 As shown in Figures 3 and 4, a sealing ring 5 and a grounding spring 7 are provided at intervals above and below the rotating cylinder 6 and the middle of the upper joint 3. The grounding spring 7 is to ensure that the housing is firmly grounded when used as a ground wire, and to avoid the problem of unstable circuit when the housing is rotated.

[0032] Example 7: As shown in the attached Figure 1 、 2 As shown in Figures 3 and 4, a shock-absorbing ring 28 is also included. The shock-absorbing ring 28 is provided on the outer side of the upper portion of the upper connector 3, the outer side of the lower portion of the motor connecting tube 11, and the outer side of the socket 27. The provision of the shock-absorbing ring 28 effectively protects the circuit portion from damage caused by impact and vibration during perforating operations, and can center the instrument string during perforation, reducing test uncertainty caused by mechanical errors.

[0033] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A downhole instrument rotating unit, characterized in that The cam is provided with a first mounting groove and a second mounting groove, and the first mounting groove is provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, each groove being provided with a plurality of grooves, The outer side of the lower end of the ring is sequentially covered with a second insulating ring and a conductive ring from bottom to top, and a limiting groove that passes through inside and outside is provided on the motor connecting tube corresponding to the outer position of the conductive ring, an insulating block is fixedly installed on the outer side of the limiting groove, and a limiting hole that passes through inside and outside is provided in the middle of the insulating block, and a conductive spring piece whose inner end contacts the conductive ring is provided. A first wire groove opening outward is provided on the motor connecting shaft corresponding to the position between the conductive spring piece and the slip ring conductive column, and a cable located in the first wire groove is provided between the slip ring conductive column and the conductive spring piece. The lower end of the motor connecting shaft is connected to the upper end of the rotating motor through a coupling, a motor front seat is installed on the outer side of the upper end of the rotating motor, and the outer side of the upper end of the motor front seat is fixedly installed together with the inner side of the lower end of the motor connecting tube, a socket is provided at the lower end of the rotating motor, a second wire groove is provided on the rotating motor casing, and a wiring hole that passes through inside and outside is provided on the lower part of the rotating motor casing. The first end of the cable is connected to the conductive spring piece, and the second end of the cable is connected to the motor and the inside of the socket through the second wire groove and the wiring hole.

2. The downhole instrument rotation unit according to claim 1, characterized in that It also includes a rotating transformer, which is provided on the motor connecting shaft corresponding to the lower side of the second insulating ring. The signal line of the rotating transformer is connected to the socket through the second wire groove, and a rotating transformer clamping nut is fixedly installed on the motor connecting shaft corresponding to the lower side of the rotating transformer.

3. The downhole instrument rotation unit according to claim 1 or 2, characterized in that A bearing pressing block, a first needle roller radial bearing, a radial bearing pressing ring and a second needle roller radial bearing are sequentially arranged between the outer side of the lower end of the insulating cylinder and the rotating cylinder from bottom to top.

4. The downhole instrument rotation unit according to claim 1 or 2, characterized in that A supporting outer ring platform is provided at the upper end of the motor connecting shaft, and a supporting inner ring platform is provided on the inner side of the motor connecting cylinder corresponding to the lower side of the supporting outer ring platform. A first needle roller thrust bearing mounted on the motor connecting shaft is provided between the lower side of the supporting outer ring platform and the upper side of the supporting inner ring platform, and a second needle roller thrust bearing mounted on the outer side of the upper end of the motor connecting shaft is provided between the upper side of the supporting outer ring platform and the lower end of the rotating cylinder.

5. The downhole instrument rotation unit according to claim 3, characterized in that A supporting outer ring platform is provided at the upper end of the motor connecting shaft, and a supporting inner ring platform is provided on the inner side of the motor connecting cylinder corresponding to the lower side of the supporting outer ring platform. A first needle roller thrust bearing mounted on the motor connecting shaft is provided between the lower side of the supporting outer ring platform and the upper side of the supporting inner ring platform, and a second needle roller thrust bearing mounted on the outer side of the upper end of the motor connecting shaft is provided between the upper side of the supporting outer ring platform and the lower end of the rotating cylinder.

6. The downhole instrument rotation unit according to claim 1, 2 or 5, characterized in that An insulating pad fixed to the outside of the conductive rod is provided at the bottom of the first installation groove.

7. The downhole tool rotation unit according to claim 3, characterized in that An insulating pad fixed to the outside of the conductive rod is provided at the bottom of the first installation groove.

8. The downhole tool rotation unit according to claim 4, characterized in that An insulating pad fixed to the outside of the conductive rod is provided at the bottom of the first installation groove.

9. The downhole instrument rotation unit according to claim 1 or 2 or 5 or 7 or 8, characterized in that It also includes a sealing ring and a grounding spring, which are respectively provided at the upper and lower intervals between the rotating cylinder and the middle of the upper joint; or / and, it also includes a shock-absorbing ring, which is provided on the outer side of the upper part of the upper joint, the outer side of the lower part of the motor connecting tube, and the outer side of the socket.

10. The downhole tool rotation unit according to claim 3, characterized in that It also includes a sealing ring and a grounding spring, which are respectively provided at the upper and lower intervals between the rotating cylinder and the middle of the upper joint; or / and, it also includes a shock-absorbing ring, which is provided on the outer side of the upper part of the upper joint, the outer side of the lower part of the motor connecting tube, and the outer side of the socket.

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