High-pressure-resistant telescopic while-drilling electrical connection device

Abstract

The invention relates to a while-drilling electrical connection device. The while-drilling electrical connection device comprises a telescopic assembly and a sealing assembly. The telescopic assembly comprises an outer cylinder used for connecting the first connector assembly and the limiting pipe, an inner cylinder and a corrugated pipe, and the first connector assembly, the limiting pipe and the corrugated pipe jointly define a first cavity between the outer cylinder and the inner cylinder. The sealing assembly comprises a first sealing piece used for fixing the upper end of the corrugated pipe to the outer wall of the inner cylinder in a sealed mode and a second sealing piece used for fixing the lower end of the corrugated pipe to the upper end of the limiting pipe in a sealed mode. The first sealing piece and the second sealing piece jointly define a second cavity between the inner cylinder and the corrugated pipe, and the second cavity communicates with the external space. When the first sealing piece and the second sealing piece move in the axial direction of the inner cylinder, the static sealing state can be kept all the time, the corrugated pipe deforms in the axial direction, and therefore the first cavity and the second cavity are separated. And compared with dynamic sealing, static sealing has better sealing stability, and the while-drilling electrical connection device can be better applied to underground high-temperature, high-pressure and vibration working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oilfield drilling technology, and particularly relates to a high-pressure-resistant telescopic while-drilling electrical connection device. BACKGROUND

[0002] In the process of horizontal well, directional well, extended reach well and other constructions, measurement instruments need to be installed on the drill collar in the guided drilling stage to collect while-drilling engineering parameters and geological parameters. Due to the need of parameter measurement methods, some sensors need to be installed on the upper end of the drill collar, and some sensors need to be installed on the lower end of the drill collar. The electrical connection structure between the sensors located on the upper end and the lower end of the drill collar needs to have reliable sealing, sufficient connection strength, and meet the length of the distance between the sensors. At present, telescopic while-drilling electrical connection devices are generally used to electrically connect the sensors located on the upper end and the lower end of the drill collar. Such electrical connection devices have reliable internal electrical connection, complete sealing, and telescopic length.

[0003] The telescopic while-drilling electrical connection device used in the prior art mainly separates the space outside the electrical connection device from the internal electrical connection space through sliding sealing to avoid the drilling fluid entering the inside of the electrical connection device, so as to ensure the reliability of the electrical connection inside the electrical connection device. However, the sliding sealing is extremely easy to fail under the working conditions of high temperature, high pressure and vibration in the well, and the sealing stability of the sliding sealing is far lower than that of the static sealing. In addition, the electrical connection space of the telescopic while-drilling electrical connection device in the prior art is only atmospheric pressure, while the pressure of the drilling fluid is as high as 140 MPa or even higher. This results in a huge pressure difference between the inside and the outside of the sealing filler in the telescopic while-drilling electrical connection device. Under such a huge pressure difference, the high temperature and vibration in the well can easily cause the sliding sealing formed by the sealing filler in the telescopic while-drilling electrical connection device to fail. SUMMARY

[0004] Based on the above problems existing in the prior art, the present application provides a while-drilling electrical connection device, which can withstand the high-pressure environment in the well in the form of static sealing under the premise of realizing the telescopic function.

[0005] The technical scheme adopted by the present application to solve the technical problems is to provide a while-drilling electrical connection device, comprising:

[0006] a telescopic assembly, comprising an outer cylinder for connecting the first joint assembly and the limiting tube, an inner cylinder sleeved in the outer cylinder and movable relative to the outer cylinder, and a bellows arranged between the inner cylinder and the outer cylinder, the first joint assembly, the limiting tube and the bellows jointly defining an independent first cavity between the outer cylinder and the inner cylinder; and

[0007] A sealing assembly includes a first sealing member for sealing and fixing the upper end of the bellows to the inner cylinder, and a second sealing member for sealing and fixing the lower end of the bellows to the limiting tube or the outer cylinder, the first sealing member and the second sealing member jointly define a second cavity between the inner cylinder and the bellows, the second cavity is in fluid communication with the external space of the electrical connection device,

[0008] The first sealing member and the second sealing member are configured to maintain static sealing state at all times when the inner cylinder moves axially relative to the outer cylinder, and separate the first cavity and the second cavity together with the bellows.

[0009] Further, the first cavity is filled with fluid for balancing the pressure on the side of the second cavity of the first sealing member and the second sealing member.

[0010] Further, the upper end of the inner cylinder is provided with an inner centralizer with two open ends and a hollow, the inner centralizer is configured to make the inner cylinder and the outer cylinder coaxial, and make the upper space of the first cavity in fluid communication with the inner cavity of the inner cylinder.

[0011] Further, the inner cylinder is provided with a balance hole, the balance hole is configured to make the lower space of the first cavity in fluid communication with the inner cavity of the inner cylinder.

[0012] Further, the inner cylinder extends into the limiting tube, the inner wall of the limiting tube is provided with a groove, the groove is configured to make the second cavity in fluid communication with the external space of the electrical connection device.

[0013] Further, the first joint assembly includes a first joint connected to the upper end of the outer cylinder, a first interface provided at the upper end of the first joint, and a first adapter provided at the lower end of the first joint, the first adapter is configured to be electrically connected with the first interface through the first wire in the first joint.

[0014] Further, the second joint assembly connected to the lower end of the inner cylinder is further included, the second joint assembly is configured to be electrically connected with the first joint assembly through the spiral wire in the inner cylinder.

[0015] Further, a matching joint is further provided between the inner cylinder and the second joint assembly, the matching joint is provided with a male joint, the male joint is configured to be rotatably connected with the female joint in the second joint assembly and maintain electrical connection.

[0016] Further, a spring is arranged between the spiral wire and the inner cylinder, an upper end of the spring abuts against a pressure cap to fix the first adapter, and a lower end of the spring abuts against a slip ring pressure sleeve to fix the male connector.

[0017] Further, the second connector assembly comprises a second connector rotationally connected with the mating connector, a second adapter arranged at an upper end of the second connector and electrically connected with the female connector, and a second interface arranged at a lower end of the second connector, the second interface being configured to be electrically connected with the second adapter through a second wire in the second connector.

[0018] The present application has the following beneficial effects: the present application provides a drill electrical connection device, which comprises a telescopic assembly and a sealing assembly, the telescopic assembly comprises an outer cylinder for connecting a first connector assembly and a limiting tube, an inner cylinder arranged in the outer cylinder, and a bellows arranged between the inner cylinder and the outer cylinder, the first connector assembly, the limiting tube and the bellows jointly define a first cavity between the outer cylinder and the inner cylinder. The sealing assembly comprises a first sealing member for sealing and fixing an upper end of the bellows on an outer wall of the inner cylinder, and a second sealing member for sealing and fixing a lower end of the bellows on an upper end of the limiting tube, the first sealing member and the second sealing member jointly define a second cavity between the inner cylinder and the bellows, the second cavity is in fluid communication with an external space of the drill electrical connection device. Wherein, the first sealing member and the second sealing member are configured to always maintain a static sealing state and cause the bellows to be axially deformed when the inner cylinder moves axially relative to the outer cylinder, so as to separate the first cavity and the second cavity. Static sealing has better sealing stability than dynamic sealing, so that the drill electrical connection device provided by the present application can be better applied in the high-temperature, high-pressure and vibration working conditions in the downhole.

[0019] In addition, the first cavity can also be filled with a fluid with the same or similar pressure as the downhole drilling fluid, and the pressure difference on both sides of the first sealing member and the second sealing member in the first cavity and the second cavity is very small. Even if there is high temperature and vibration in the downhole, the sealing of the first sealing member and the second sealing member to the first cavity and the second cavity is difficult to be affected. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in conjunction with the drawings and examples.

[0021] Figure 1 Fig. 1 shows a schematic view of the overall structure of a high-pressure-resistant telescopic drill electrical connection device.

[0022] Figure 2 Fig. 2 shows a schematic view of the telescopic assembly of the high-pressure-resistant telescopic drill electrical connection device. Figure 1A section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view.

[0023] Figure 3 A section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view. Figure 1 B section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view.

[0024] Figure 4 B section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view. Figure 1 C section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view.

[0025] Figure 5 C section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view. Figure 1 D section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view.

[0026] Figure 6 D section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view. Figure 5 F-F section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view.

[0027] Figure 7 F-F section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view. Figure 1 E section of the electrical connection while drilling device shown in FIG. 1 is shown in partial enlarged view.

[0028] In the figure, each reference numeral: 100, electrical connection while drilling device; 10, first joint assembly; 11, first joint; 12, first interface; 13, first adapter; 14, first wire; 15, first centralizer;

[0029] 20, telescopic assembly; 21, outer cylinder; 211, first cavity; 22, inner cylinder; 221, balance hole; 222, spring; 223, spiral wire; 224, pressure cap; 225, slip ring pressure sleeve; 23, bellows; 231, second cavity; 24, inner centralizer; 25, limiting tube; 251, second centralizer; 252, groove; 26, mating joint; 261, male joint;

[0030] 30, second joint assembly; 31, second joint; 32, second interface; 33, second adapter; 34, second wire; 35, female joint;

[0031] 40, sealing assembly; 41, first sealing element; 42, second sealing element. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be described in detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, and only schematically illustrate the basic structure of the present application, and therefore only show the components related to the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Reference Figure 1 As shown in the drawings, the present application provides a high-pressure-resistant telescopic while-drilling electrical connection device 100, which comprises a telescopic assembly 20, and a first joint assembly 10 and a second joint assembly 30 respectively and sealingly connected at both ends of the telescopic assembly 20. The while-drilling electrical connection device 100 further comprises a sealing assembly 40 installed between the first joint assembly 10 and the telescopic assembly 20, between the second joint assembly 30 and the telescopic assembly 20, and in the telescopic assembly 20, and the sealing assembly 40 can separate the internal space and the external space of the telescopic assembly 20. Moreover, the sealing formed by the sealing assembly 40 in the while-drilling electrical connection device 100 is a static seal, which is used to withstand the high-pressure environment in the well. And during the telescoping process of the telescopic assembly 20, the sealing assembly 40 can still withstand the high-pressure environment in the well in the form of static seal.

[0034] In some embodiments, the inside of the telescopic assembly 20 is also filled with fluid, and the pressure of the fluid is the same as or close to the pressure of the drilling fluid outside the while-drilling electrical connection device 100. Because the pressure of the fluid is the same as or close to the pressure of the drilling fluid outside the while-drilling electrical connection device 100, the pressure difference between the inside and the outside of the telescopic assembly 20 is very small. When the telescopic assembly 20 is telescoped, the sealing assembly 40 still has good sealing performance and stability. The fluid can be gas and / or liquid. In a preferred embodiment, the fluid is hydraulic oil.

[0035] Reference Figure 2As shown, in some embodiments, the first joint assembly 10 comprises a first joint 11 sealingly connected with the telescopic assembly 20, a first interface 12 sealingly mounted on the upper end of the first joint 11, and a first adapter 13 mounted on the lower end of the first joint 11. The first joint 11 is a hollow tubular structure with two open ends. The circumferential sidewall of the upper end of the first joint 11 is configured to be sealingly connected with some electrical devices such as sensors on the drill collar (not shown), and the circumferential sidewall of the lower end of the first joint 11 is configured to be sealingly connected with the telescopic assembly 20. A plurality of first wires 14 are further arranged in the first joint 11, and the two ends of the plurality of first wires 14 are electrically connected with the first interface 12 and the first adapter 13, respectively. In some embodiments, a plurality of terminal posts (not shown) are arranged on the opposite sides of the first interface 12 and the first adapter 13, respectively. The plurality of first wires 14 are connected with the corresponding terminal posts on the first interface 12 and the first adapter 13, respectively, so as to realize the transmission of power and / or signals between the first interface 12 and the first adapter 13.

[0036] In the present embodiment, the first interface 12 is fixed on the upper end face of the first joint 11 by screws. The circumferential sidewall of the first adapter 13 is in interference fit with the inner wall of the first joint 11, so that a seal is formed between the first adapter 13 and the first joint 11, which can prevent the fluid in the telescopic assembly 20 from entering the first joint 11.

[0037] In some embodiments, a first centralizer 15 is further arranged on the sidewall of the first joint 11. The first centralizer 15 extends radially outward, which facilitates the coaxial installation of the electrical connection device 100 on the drill collar.

[0038] Reference Figures 3-5 As shown, in some embodiments, the telescopic assembly 20 comprises an outer cylinder 21 connected with the lower end of the first joint 11, an inner cylinder 22 sleeved in the outer cylinder 21, and a bellows 23 arranged between the inner cylinder 22 and the outer cylinder 21. The upper end of the inner cylinder 22 is provided with an inner centralizer 24 supported on the inner wall of the outer cylinder 21, and the inner centralizer 24 is in sliding connection with the inner wall of the outer cylinder 21. A hollow limiting tube 25 is arranged between the lower end of the inner cylinder 22 and the lower end of the outer cylinder 21, and a second centralizer 251 is further mounted on the limiting tube 25. The first centralizer 15 cooperates with the second centralizer 251 to facilitate the coaxial installation of the electrical connection device 100 on the drill collar. Under the combined support of the inner centralizer 24 and the limiting tube 25, the inner cylinder 22 and the outer cylinder 21 have good coaxiality. The inner cylinder 22 can move axially relative to the outer cylinder 21 to realize the telescopic function of the telescopic assembly 20.

[0039] In some embodiments, the upper end of the outer cylinder 21 is sleeved on the lower end of the first connector 11. The outer cylinder 21 and the first connector 11 can be connected by screwing, clamping or the like. A sealing filler (not shown in the figure) made of silica gel, rubber or the like is arranged between the outer cylinder 21 and the first connector 11, so that a seal is formed between the outer cylinder 21 and the first connector 11. The lower end of the outer cylinder 21 is sleeved on the outside of the limiting tube 25, and the outer cylinder 21 is fixedly connected with the limiting tube 25. The first connector 11, the limiting tube 25 and the bellows 23 jointly define a first cavity 211 between the outer cylinder 21 and the inner cylinder 22.

[0040] In some embodiments, the inner centralizing block 24 at the upper end of the inner cylinder 22 is a hollow structure with both ends open, so that the upper space of the first cavity 211 is in communication with the inner cavity of the inner cylinder 22. A sealing filler (not shown in the figure) made of silica gel, rubber or the like is also arranged on the outer wall of the inner centralizing block 24, so that a seal is formed between the inner centralizing block 24 and the outer cylinder 21. The inner centralizing block 24 is fixedly connected to the upper end of the inner cylinder 22, so that the inner centralizing block 24 can move axially together with the inner cylinder 22 relative to the outer cylinder 21. The portion of the inner cylinder 22 between the upper end of the bellows 23 and the inner centralizing block 24 is also provided with a balance hole 221, which communicates the upper and lower spaces of the first cavity 211 and the inner cavity of the inner cylinder 22. The first cavity 211 can be filled with the fluid, and the fluid can flow freely between the upper and lower spaces of the first cavity 211 and the inner cavity of the inner cylinder 22 through the balance hole 221 and the hollow inner centralizing block 24.

[0041] In combination with Figure 5 and Figure 7 As shown, the lower end of the inner cylinder 22 extends out of the limiting tube 25 and is provided with a mating connector 26 with both ends open, which is used to connect the second connector assembly 30. The mating connector 26 is provided with a male connector 261 extending downward, and a plurality of connection rings (not shown in the figure) made of metal are arranged on the male connector 261 in the axial direction of the male connector 261.

[0042] In combination with Figures 2-5 and Figure 7 As shown, the inner cylinder 22 is further provided with a spring 222 extending from the first connector 11 to the mating connector 26, and a spiral wire 223 extending from the first connector 11 to the mating connector 26 is sleeved in the spring 222. The spiral wire 223 is twisted by a plurality of strands of wire and can transmit power and / or signals between the first connector 11 and the mating connector 26. Specifically, the upper end of the spiral wire 223 is electrically connected with the first adapter 13, and the lower end of the spiral wire 223 is electrically connected with the input end of the male connector 261. For convenience of illustration, Figures 3-5The spring 222 and the helical wire 223 are only partially shown or not shown in some embodiments. In some embodiments, the spring 222 can be elongated or shortened and the helical wire 223 can also be elongated or shortened when the inner cylinder 22 moves axially relative to the outer cylinder 21.

[0043] In combination Figure 2 and Figure 7 As shown in Figs. 2 and 3, in some embodiments, the upper end and the lower end of the spring 222 are provided with a pressure cap 224 and a slip ring pressure sleeve 225 respectively. The pressure cap 224 is used to fix the first adapter 13 on the first joint 11, and the slip ring pressure sleeve 225 is used to seal and install the male joint 261 in the mating joint 26. In some preferred embodiments, when the inner cylinder 22 moves axially relative to the outer cylinder 21, the spring 222 is always in a compressed state and abuts against the pressure cap 224 and the slip ring pressure sleeve 225, thereby ensuring the firmness of the installation of the first adapter 13 and the male joint 261.

[0044] Referring to Figure 3 and Figure 4 As shown in Figs. 2 and 3, in some embodiments, the sealing assembly 40 includes a first seal 41 and a second seal 42 provided at the upper end and the lower end of the bellows 23 respectively. The first seal 41 is used to seal and fix the upper end of the bellows 23 on the inner cylinder 22, and the second seal 42 is used to seal and fix the lower end of the bellows 23 on the upper end face of the limiting tube 25. Therefore, the seal formed by the first seal 41 on the inner cylinder 22 is a static seal, and the seal formed by the second seal 42 on the upper end face of the limiting tube 25 is also a static seal. The first seal 41 and the second seal 42 together define the second cavity 231 between the inner cylinder 22 and the bellows 23.

[0045] In combination Figure 5 and Figure 6 As shown in Figs. 2 and 3, the inner wall of the limiting tube 25 is further provided with an axial groove 252, which cooperates with the outer wall of the inner cylinder 22 to form a passage, so that the second cavity 231 can communicate with the external space of the electrical connection device 100. Therefore, the drilling fluid in the external space of the electrical connection device 100 can flow into the second cavity 231 through the groove 252. In other embodiments, the second seal 42 can also seal and fix the lower end of the bellows 23 on the outer cylinder 21.

[0046] In some embodiments, since the first cavity 211 can be filled with the fluid having the same or close pressure as the drilling fluid, the pressure difference on both sides of the first seal 41 and the second seal 42 located at the first cavity 211 and the second cavity 231 is very small. Even if there is a high temperature and vibration working condition downhole, the sealing of the first seal 41 and the second seal 42 on the first cavity 211 and the second cavity 231 is difficult to be affected.

[0047] Re-engage Figures 2-5 and Figure 7 As shown in FIG. 2, in one embodiment, the electrical connection device 100 is elongated. At this time, the inner cylinder 22 and the inner centralizer 24 at the upper end of the inner cylinder 22 move downward relative to the axis of the outer cylinder 21. Since the upper end of the bellows 23 is fixedly sealed to the outer wall of the inner cylinder 22 by the first seal 41, and the lower end of the bellows 23 is fixedly sealed to the upper end of the limiting tube 25 by the second seal 42, the bellows 23 is compressed during the elongation of the electrical connection device. At this time, the volume of the first cavity 211 is expanded, and the volume of the second cavity 231 is reduced.

[0048] In this embodiment, although the first seal 41 moves relative to the outer cylinder 21 as the inner cylinder 22 moves, the first seal 41 is always stationary relative to the inner cylinder 22. That is, the first seal 41 and the second seal 42 form a static seal rather than a dynamic seal between the first cavity 211 and the second cavity 231 during the entire elongation of the electrical connection device 100. In a complex working environment such as high temperature, high pressure, and vibration in the well, a static seal is less likely to fail than a dynamic seal. A static seal has higher sealing stability than a dynamic seal. This is well known to those skilled in the art.

[0049] In one preferred embodiment, the fluid injected into the first cavity 211 can cause the side of the first seal 41 in the first cavity 211 and the side of the first seal 41 in the second cavity 231 to always bear the same or approximately the same pressure. That is, the pressure difference on both sides of the first seal 41 is small, thereby further ensuring the sealing stability of the first seal 41. Similarly, the fluid can also cause the side of the second seal 42 in the first cavity 211 and the side of the second seal 42 in the second cavity 231 to always bear the same or approximately the same pressure.

[0050] For the bellows 23, due to its own characteristics of circular cross-section and axial folding, the bellows 23 can easily withstand the pressure difference between the inside and the outside. Even in the extreme case where there is no fluid in the first cavity 211, the bellows 23 can support the entire pressure of the drilling fluid in the second cavity 231 on the inner wall of the bellows 23 by folding the outer side of the bellows 23 on the inner wall of the outer cylinder 21. In other embodiments, the bellows 23 can be replaced by other pipe elements with axial expansion function, such as rubber pipes. In this embodiment, the bellows 23 is preferred.

[0051] When the electrical connection while drilling device 100 is stretched to the longest, the bellows 23 is compressed to the shortest, and the end of the limiting tube 25 limits the inner cylinder 22 from moving downward relative to the outer cylinder 21 through the bellows 23. At this time, the volume of the second cavity 231 is in the smallest state, and the volume of the first cavity 211 is in the largest state.

[0052] In another specific embodiment, the electrical connection while drilling device 100 is shortened. At this time, the inner cylinder 22 and the inner centralizer 24 at the upper end thereof move upward relative to the outer cylinder 21 in the axial direction. Since the upper end of the bellows 23 is sealed and fixed to the outer wall of the inner cylinder 22 by the first sealing member 41, and the lower end of the bellows 23 is sealed and fixed to the upper end of the limiting tube 25 by the second sealing member 42, the bellows 23 is stretched during the shortening of the electrical device. At this time, the volume of the first cavity 211 is reduced, and the volume of the second cavity 231 is expanded.

[0053] As in the above embodiment, the first sealing member 41 is always stationary relative to the inner cylinder 22. That is, during the entire shortening of the electrical connection while drilling device 100, the first sealing member 41 is still a static seal rather than a dynamic seal between the first cavity 211 and the second cavity 231. In a complex working environment such as high temperature, high pressure, and vibration in the well, the static seal has higher sealing stability than the dynamic seal.

[0054] In one preferred embodiment, the fluid filled in the first cavity 211 can make the side of the first sealing member 41 in the first cavity 211 and the side in the second cavity 231 always bear the same or approximately the same pressure. That is, the pressure difference on both sides of the first sealing member 41 is small, thereby further ensuring the sealing stability of the first sealing member 41. Similarly, the fluid can also make the side of the second sealing member 42 in the first cavity 211 and the side in the second cavity 231 always bear the same or approximately the same pressure.

[0055] When the electrical connection while drilling device 100 is shortened to the shortest, the bellows 23 is stretched to the longest. The upper end of the inner centralizer 24 abuts against the lower end of the first joint 11 to limit the inner cylinder 22 from moving upward relative to the outer cylinder 21. At this time, the volume of the second cavity 231 is in the largest state, and the volume of the first cavity 211 is in the smallest state.

[0056] Reference Figure 7As shown, in some embodiments, the second joint assembly 30 includes a second joint 31 rotatably connected to the lower end of the mating joint 26, a second interface 32 mounted to the lower end of the second joint 31, and a second adapter 33 mounted to the upper end of the second joint 31. The second joint 31 is a hollow tubular structure with two open ends. The circumferential sidewall of the upper end of the second joint 31 is rotatably connected to the inner wall of the lower end of the mating joint 26, and the circumferential sidewall of the lower end of the second joint 31 is also configured to be sealingly connected to the electrical devices such as sensors on the drill collar. A plurality of second wires 34 are also provided in the second joint 31, and the two ends of the plurality of second wires 34 are electrically connected to the second interface 32 and the second adapter 33, respectively. In some embodiments, a plurality of terminal posts (not shown) are provided on the opposite sides of the second interface 32 and the second adapter 33. The plurality of second wires 34 are connected to the corresponding terminal posts on the second interface 32 and the second adapter 33, respectively, so as to realize the transmission of power and / or signals between the second interface 32 and the second adapter 33. In the present embodiment, the second interface 32 is fixed to the lower end surface of the second joint 31 by screws.

[0057] In the present embodiment, the upper end of the second joint 31 is also provided with a female joint 35 to which the second adapter 33 is electrically connected. A plurality of contact rings (not shown) are provided on the inner wall of the female joint 35 and arranged along the axial direction of the female joint 35. In some embodiments, when the second joint assembly 30 is connected to the mating joint 26, the male joint 261 can be inserted into the female joint 35. The plurality of connection rings on the male joint 261 and the plurality of contact rings on the female joint 35 are in one-to-one contact and cooperation, realizing the electrical connection between the male joint 261 and the female joint 35, and further realizing the electrical connection between the telescopic assembly 20 and the second joint assembly 30.

[0058] In a specific embodiment, the vibration of the drill collar during operation mainly consists of axial displacement and circumferential torsion. The axial telescoping of the telescopic assembly 20 can eliminate the axial displacement of the drill collar during operation, and the rotatable connection between the mating joint 26 and the second joint 31 can eliminate the circumferential torsion of the drill collar during operation, thereby ensuring the stability of the electrical connection between some electrical devices such as sensors on the drill collar. When the mating joint 26 and the second joint 31 rotate relative to each other, the male joint 261 and the female joint 35 can also rotate relative to each other. During this process, the plurality of connection rings on the male joint 261 and the plurality of contact rings on the female joint 35 are still in one-to-one contact and cooperation. The electrical connection between the male joint 261 and the female joint 35 is still good, thereby ensuring the electrical connection between the telescopic assembly 20 and the second joint assembly 30, and further ensuring the stability of the electrical connection between some electrical devices such as sensors on the drill collar.

[0059] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, can also be detachable connection or integral connection, can be mechanical connection, can be direct connection or indirect connection through intermediate medium, can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] It should be understood that the terms "length", "width", "upper", "lower", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0061] The above is based on the ideal embodiment of the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the scope of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A drilling electrical connection device, comprising: A telescopic assembly (20) includes an outer cylinder (21) for connecting a first connector assembly (10) and a limiting tube (25), an inner cylinder (22) sleeved within the outer cylinder (21) and movable relative to the outer cylinder (21), and a bellows (23) disposed between the inner cylinder (22) and the outer cylinder (21). The first connector assembly (10), the limiting tube (25), and the bellows (23) together define a first cavity (211) between the outer cylinder (21) and the inner cylinder (22). The sealing assembly (40) includes a first seal (41) for sealing the upper end of the bellows (23) onto the inner cylinder (22), and a second seal (42) for sealing the lower end of the bellows (23) onto the limiting tube (25) or the outer cylinder (21). The first seal (41) and the second seal (42) together define a second cavity (231) between the inner cylinder (22) and the bellows (23), and the second cavity (231) is in fluid communication with the external space of the drilling electrical connection device (100). The first seal (41) and the second seal (42) are configured to maintain a static seal when the inner cylinder (22) moves axially relative to the outer cylinder (21), and together with the bellows (23), they separate the first cavity (211) and the second cavity (231).

2. The drilling electrical connection device according to claim 1, characterized in that, The first cavity (211) is filled with fluid to balance the pressure of the first seal (41) and the second seal (42) located on one side of the second cavity (231).

3. The drilling electrical connection device according to claim 1, characterized in that, The upper end of the inner cylinder (22) is provided with an inner straightening block (24) that is open at both ends and hollow. The inner straightening block (24) is configured to make the inner cylinder (22) and the outer cylinder (21) coaxial and to make the upper space of the first cavity (211) fluidly connected to the inner cavity of the inner cylinder (22).

4. The drilling electrical connection device according to claim 3, characterized in that, The inner cylinder (22) has a balance hole (221) configured to allow the lower space of the first cavity (211) to be in fluid communication with the inner cavity of the inner cylinder (22).

5. The drilling electrical connection device according to claim 1, characterized in that, The inner cylinder (22) extends into the limiting tube (25), and a groove (252) is provided on the inner wall of the limiting tube (25). The groove (252) is configured to allow the second cavity (231) to be fluidly connected to the external space of the drilling electrical connection device (100).

6. The electrical connection device for drilling according to any one of claims 1-5, characterized in that, The first connector assembly (10) includes a first connector (11) connected to the upper end of the outer cylinder (21), a first interface (12) disposed at the upper end of the first connector (11), and a first adapter (13) disposed at the lower end of the first connector (11). The first adapter (13) is configured to be electrically connected to the first interface (12) through a first wire (14) inside the first connector (11).

7. The drilling electrical connection device according to claim 6, characterized in that, It also includes a second connector assembly (30) connected to the lower end of the inner cylinder (22), the second connector assembly (30) being configured to be electrically connected to the first connector assembly (10) via a helical wire (223) inside the inner cylinder (22).

8. The drilling electrical connection device according to claim 7, characterized in that, A mating joint (26) is also provided between the inner cylinder (22) and the second connector assembly (30). A male connector (261) is provided inside the mating joint (26). The male connector (261) is configured to be rotatably connected to the female connector (35) inside the second connector assembly (30) and maintain an electrical connection.

9. The electrical connection device for drilling according to claim 8, characterized in that, A spring (222) is provided between the spiral wire (223) and the inner cylinder (22). The upper end of the spring (222) abuts against a pressure cap (224) to fix the first adapter (13), and the lower end of the spring (222) abuts against a slip ring pressure sleeve (225) to fix the male connector (261).

10. The drilling electrical connection device according to claim 8, characterized in that, The second connector assembly (30) includes a second connector (31) rotatably connected to the mating connector (26), a second adapter (33) disposed at the upper end of the second connector (31) and electrically connected to the female connector (35), and a second interface (32) disposed at the lower end of the second connector (31), the second interface (32) being configured to be electrically connected to the second adapter (33) through a second wire (34) inside the second connector (31).

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