Connecting device for communication cable in intelligent drill rod joint

Abstract

The invention relates to a connecting device for a communication cable in an intelligent drill rod joint, which comprises an integrated pin, a socket and a positioning joint assembly, and is characterized in that the integrated pin is inserted into one end of the socket, the other end of the socket is connected with the positioning joint assembly, and the positioning joint assembly is clamped in a stepped hole in the drill rod joint to realize positioning of the socket; communication cables penetrate through the integrated contact pin and the positioning connector assembly respectively, so that electric signals of the communication cable of one drill rod connector are transmitted to the communication cable of the other connector. The communication cable connector has the technical advantages of being small in space size, compact in structure, good in sealing performance, reliable in connection, convenient to assemble and disassemble and the like, and contact between drilling fluid and a communication cable is isolated.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling equipment communication, and in particular to a connecting device for internal communication cables of an intelligent drill pipe joint. Background Art

[0002] During oil exploration and production, drillers often lack intuitive and ambiguous information about the drilling status and underlying structure within the hole. This information lag can prevent them from making timely corrections and adjustments to the entire drill pipe system when faced with complex formations. This can cause the drilling direction to deviate, preventing the intended exploration location from being reached, and can also damage the drill pipe's mechanical structure.

[0003] As the most direct link between the surface and underground, the drill pipe is a crucial structure, serving both as a tool for deep excavation and as a channel for upward information feedback. Intelligent drill pipes enable real-time, high-speed, bidirectional, and precise monitoring of downhole geological information and the status and characteristics of drill tools. This supports real-time operation, intelligent control, and maintenance of the drilling process, and is a key development direction for intelligent oil drilling equipment today and in the future.

[0004] Magnetic coupling communication is the main communication method currently used by smart drill pipes at home and abroad. It relies on the electromagnetic coupling effect between the conductive coils between the drill pipe joints and the magnetic coupling core group to transmit the electrical signal of the communication cable of one drill pipe joint to the communication cable of another joint, and then the communication cable is passed to the next drill pipe joint, and the transmission is carried out section by section, with a transmission rate of up to 2Mbps. In order to prevent the high-speed, high-pressure, and multi-phase drilling fluid from corroding and damaging the communication cable and its connection, the communication cable and its connection device must be located inside the drill pipe joint. Due to the thin wall of the drill pipe joint, the communication cable connection device requires small size, compact structure, good connectivity, good sealing, and good assembly and disassembly. Existing connection devices are difficult to meet these technical requirements at the same time. Although the current communication test joint with a pressure sealing structure is compact and sealed in structure, it does not meet the requirements of centering function and easy assembly and disassembly.

[0005] Therefore, there is an urgent need for a connection device for the internal communication cable of the intelligent drill pipe joint. Summary of the Invention

[0006] The present invention provides a connection device for communication cables inside an intelligent drill pipe joint. The present invention has the technical advantages of small space size, compact structure, good sealing performance, reliable connection, and easy assembly and disassembly, and isolates the contact between drilling fluid and communication cables.

[0007] The present invention provides a connection device for internal communication cables of an intelligent drill pipe joint, comprising an integrated pin, a socket and a positioning joint assembly. The integrated pin is inserted into one end of the socket, and the other end of the socket is connected to the positioning joint assembly. The positioning joint assembly is clamped at a stepped hole position inside the drill pipe joint to achieve positioning of the socket. Communication cables are respectively passed through the integrated pin and the positioning joint assembly to achieve transmission of electrical signals from the communication cable of one section of the drill pipe joint to the communication cable of another section.

[0008] In the connecting device for internal communication cables of intelligent drill pipe joints, preferably, the integrated pin includes a magnetic coupling component, a plastic tube and a pin component, and the magnetic coupling component, the plastic tube and the pin component are connected in sequence.

[0009] The connecting device for the internal communication cable of the intelligent drill pipe joint, preferably, the magnetic coupling assembly includes a magnetic coupler, a conductive coil, a magnetic coupler base and an adapter joint, the magnetic coupler is installed in the magnetic coupler base, the conductive coil is placed in the magnetic coupler, and the magnetic coupler, the conductive coil and the magnetic coupler base are sealed with sealant into one, an opening is provided on the magnetic coupler base, one end of the adapter joint is positioned with the magnetic coupler base through a stepped hole, and is connected to one by welding, the other end of the adapter joint and the end of the pin assembly are respectively provided with a pagoda joint, the two ends of the plastic tube are respectively connected to the other end of the adapter joint and the pin assembly through the pagoda joint, so that the first section of the communication cable is led out of the opening, and the first section of the communication cable is connected to the pin assembly after passing through the adapter joint and the plastic tube.

[0010] The connecting device for the internal communication cable of the intelligent drill pipe joint preferably comprises a core-level metal pin, a first rubber insulation layer, a first metal conductive layer, a second rubber insulation layer and a first metal protective shell. The core-level metal pin and the first metal conductive layer form a pin terminal. One end of the pin terminal is connected to the first section of the communication cable, and the other end of the pin terminal is connected to the socket by insertion or docking. The core-level metal pin and one end of the first metal conductive layer are provided with a pin terminal. The first section of the communication cable passes through the magnetic coupler base, the adapter connector, and the plastic tube in sequence and is connected to the pin terminal. The second rubber insulation layer is provided with an insulating convex ring, which is inserted into the socket. The end of the first metal protective shell is provided with the pagoda joint. The plastic tube is connected to the first metal protective shell through the pagoda joint. The first metal protective shell is provided with a first outer ring O-ring groove, and a first rubber O-ring is installed in the first outer ring O-ring groove.

[0011] The connection device for the internal communication cable of the intelligent drill pipe joint, preferably, the socket includes a core-level metal jack layer, a third rubber insulation layer, a second metal conductive layer, a fourth rubber insulation layer and a second metal protective shell arranged from the inside to the outside, the core-level metal layer is provided with a metal jack, and the ends of the metal layer where the core-level metal jack layer is provided and the second metal conductive layer are provided with socket terminals, the core-level metal layer and the second metal conductive layer are respectively connected to the second section of the communication cable, and the second section of the communication cable is connected to the socket terminal, the core-level metal pin is inserted into the metal jack, the second metal conductive layer is butt-connected to the first metal conductive layer, one end of the fourth rubber insulation layer is provided with an insulating groove, the insulating convex ring is provided in the insulating groove for sealing connection, the second metal protective shell is provided with a second outer ring O-ring groove, the second rubber O-ring is installed in the second outer ring O-ring groove, the second metal protective shell is provided with an external thread, and the second metal protective shell is connected to the positioning joint assembly through the thread.

[0012] The connecting device for the internal communication cable of the intelligent drill pipe joint, preferably, the positioning joint assembly includes a positioning joint and a cable protection tube, the two ends of the positioning joint are respectively connected to the second metal protective shell and the cable protection tube by threads, the positioning joint is arranged at the stepped hole position inside the drill pipe joint, the positioning joint and the cable protection tube are respectively provided with a cavity, and the cavity is used for the second section of the communication cable to pass through and be connected to the socket terminal.

[0013] The beneficial effects are:

[0014] The present invention adopts sealant, welding, pagoda joint and O-ring for sealing connection, has good sealing effect, high integration and is easy to assemble and disassemble.

[0015] The socket of the present invention is connected to the positioning joint through threads and is positioned on the shoulder of the drill pipe joint, which is convenient for installation and removal of the integrated pin.

[0016] The present invention provides a sealed connection between the socket and the integrated pin through the rubber convex ring and the rubber groove, thereby preventing drilling fluid from entering the portion where the pin is connected to the socket.

[0017] The present invention has the technical advantages of small space size, compact structure, good sealing performance, reliable connection, easy assembly and disassembly, and isolates the contact between drilling fluid and communication cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a structural diagram of the integrated pin;

[0020] Figure 3 It is a structural diagram of the pin assembly;

[0021] Figure 4 Schematic diagram of the socket structure;

[0022] In the picture:

[0023] 1. Adapter; 2. Socket; 3. Positioning connector; 5. Second section of communication cable;

[0024] 4. Drill pipe joint; 6. First section of communication cable; 7. Cable protection tube;

[0025] 22. Magnetic coupler base; 23. Plastic tube; 25. Pagoda connector;

[0026] 31. Pin terminal; 32. First rubber O-ring; 33. First rubber insulation layer; 34. Insulating convex ring;

[0027] 35. Core-level metal pin; 36. First metal protective shell; 37. First metal conductive layer; 38. Second rubber insulation layer;

[0028] 41. Insulation groove; 42. Third rubber insulation layer; 43. Second metal protective shell; 44. Second rubber O-ring;

[0029] 45. Fourth rubber insulation layer; 46. External thread; 47. Core metal jack; 48. Second metal conductive layer;

[0030] 49. Socket terminal. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the systems or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the use of terms such as "first," "second," "third," and "fourth" to define components is intended solely to facilitate the distinction between such components. Unless otherwise stated, these terms have no special meanings and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] The present invention provides a connection device for internal communication cables of an intelligent drill pipe joint, comprising an integrated pin, a socket, and a positioning joint assembly. The integrated pin is inserted into one end of the socket, and the other end of the socket is connected to the positioning joint assembly. The positioning joint assembly is clamped in a stepped hole position inside the drill pipe joint to achieve positioning of the socket. Communication cables are respectively passed through the integrated pin and the positioning joint assembly to achieve transmission of electrical signals from one section of the communication cable of the drill pipe joint to the communication cable of another section. The present invention has technical advantages such as small space size, compact structure, good sealing performance, reliable connection, and easy assembly and disassembly, and isolates the contact between drilling fluid and communication cables.

[0035] The entire technical process is described in detail below using a connection device for internal communication cables of an intelligent drill pipe joint as an example.

[0036] Figures 1 to 4 The figure shows a connection device for internal communication cables of an intelligent drill pipe joint, comprising an integrated pin, a socket 2 and a positioning joint assembly. The integrated pin is inserted into one end of the socket 2, and the other end of the socket 2 is connected to the positioning joint assembly. The positioning joint assembly is clamped in the stepped hole position inside the drill pipe joint 4 to realize the positioning of the socket 2. The integrated pin and the positioning joint assembly respectively pass through the communication cables to realize the transmission of electrical signals from the communication cable of one section of the drill pipe joint 4 to the communication cable of another section of the joint.

[0037] like Figure 2 As shown, the integrated pin includes a magnetic coupling component, a plastic tube 23 and a pin component, and the magnetic coupling component, the plastic tube and the pin component are connected in sequence.

[0038] The magnetic coupling assembly includes a magnetic coupler, a conductive coil, a magnetic coupler base 22 and an adapter connector 1. The magnetic coupler is installed in the magnetic coupler base 22, the conductive coil is placed in the magnetic coupler, and the magnetic coupler, the conductive coil and the magnetic coupler base 22 are sealed together with sealant. An opening is provided on the magnetic coupler base 22. One end of the adapter connector 1 is positioned with the magnetic coupler base 22 through a stepped hole and is connected together by welding. The other end of the adapter connector 1 and the end of the pin assembly are respectively provided with a pagoda connector 25. The two ends of the plastic tube 23 are respectively connected to the other end of the adapter connector 1 and the pin assembly through the pagoda connector 25, so that the first section of the communication cable 6 is led out of the opening, and the first section of the communication cable 6 is connected to the pin assembly after passing through the adapter connector 1 and the plastic tube.

[0039] like Figure 3 As shown, the pin assembly includes a core-level metal pin 35, a first rubber insulation layer 33, a first metal conductive layer 37, a second rubber insulation layer 38 and a first metal protective shell 36. One end of the core-level metal pin 35 and the first metal conductive layer 37 is provided with a pin terminal 31. The first section of communication cable 6 passes through the magnetic coupler base 22, the adapter connector 1, and the plastic tube 23 in sequence and is connected to the pin terminal 31. The second rubber insulation layer 38 is provided with an insulating convex ring, which is inserted into the socket 2. The end of the first metal protective shell 36 is provided with a pagoda joint 25. The plastic tube 23 is connected to the first metal protective shell 36 through the pagoda joint 25. The first metal protective shell is provided with a first outer ring O-ring groove, and the first rubber O-ring 32 is installed in the first outer ring O-ring groove.

[0040] like Figure 4 As shown, the socket 2 includes a core-level metal jack 47, a third rubber insulation layer 42, a second metal conductive layer 48, a fourth rubber insulation layer 45 and a second metal protective shell 43 arranged from the inside to the outside. The metal layer where the core-level metal jack 47 is set and the end of the second metal conductive layer 48 are provided with a socket terminal 49. The second section of the communication cable 5 is connected to the socket terminal 49. The core-level metal pin 35 is inserted into the core-level metal jack 47. The second metal conductive layer 48 is docked with the first metal conductive layer 37. An insulating groove 41 is provided at one end of the fourth rubber insulation layer 45. An insulating convex ring 34 is provided in the insulating groove 41 for sealing connection. A second outer ring O-ring groove is provided on the second metal protective shell. A second rubber O-ring 44 is installed in the second outer ring O-ring groove. A thread 46 is provided on the second metal protective shell 43. The second metal protective shell 43 is connected to the positioning joint assembly through the external thread 46.

[0041] like Figure 1 and Figure 4As shown, the positioning joint assembly includes a positioning joint 3 and a cable protection tube 7. The two ends of the positioning joint 3 are respectively connected to the second metal protective shell 43 and the cable protection tube 7 through threads 46. The positioning joint 3 is arranged at the stepped hole position inside the drill pipe joint 4. The positioning joint 3 and the cable protection tube 7 are respectively provided with a cavity, which is used for the second section of the communication cable 5 to pass through and be connected to the socket terminal.

[0042] A method for installing a connection device for an internal communication cable of an intelligent drill pipe joint comprises the following steps:

[0043] Step 1: Position one end of the adapter connector 1 with the base of the magnetic coupler through the stepped hole and connect them into one piece by welding.

[0044] Step 2: Install the first rubber O-ring 32 into the first outer O-ring groove of the adapter connector 1.

[0045] Step 3: The adapter joint 1 and the plastic tube 23 are sealed together through the pagoda joint 25.

[0046] In step 4, the magnetic coupler is installed into the magnetic coupler base 22, and the conductive coil is placed into the magnetic coupler. Sealant is poured in to seal the magnetic coupler. The first section of the communication cable 6 is led out from the opening on the magnetic coupler base 22, and the first section of the communication cable 6 passes through the adapter connector 1 and the plastic tube 23 and is connected to the pin terminal 31. That is, the first section of the communication cable 6 is connected to the core-level metal pin 35 and the first metal conductive layer 37.

[0047] In step 5, the pin assembly is connected to the plastic tube 23 through the pagoda connector 25 to achieve a sealed connection, thereby ensuring a sealed connection between the coupler base 22 and the communication cable 6 of the pin, and forming an integrated pin structure.

[0048] Step 6. Install the third rubber O-ring on the third rubber O-ring of positioning joint 3.

[0049] Step 7: Push the positioning joint 3 to the stepped hole position inside the drill pipe joint 4 for positioning.

[0050] Step 8: Use an inner hexagonal wrench to rotate the inner hexagonal hole inside the positioning joint 3 to achieve threaded connection between the positioning joint 3 and the cable protection tube 3.

[0051] In step 9, the second section of the communication cable 5 is passed through the cable protection tube 7 and the positioning joint 3 in sequence, and is connected to the core-level metal jack 47 and the second metal conductive layer 48 .

[0052] In step 10, the positioning connector 3 is connected to the socket 2 via the external thread 46 .

[0053] In step 11, the insulating protrusion ring 34 and the insulating groove 41 are sealed and connected, and the core-level metal pin 35 is inserted into the metal socket, so that the integrated pin is inserted into the socket 2, and the core-level metal pin 35 and the core-level metal socket 47 are connected, and the first metal conductive layer 37 and the second metal conductive layer 48 are connected.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A connection device for internal communication cables of an intelligent drill pipe joint, characterized in that: It includes an integrated pin, a socket and a positioning joint assembly. The integrated pin is inserted into one end of the socket, and the other end of the socket is connected to the positioning joint assembly. The positioning joint assembly is clamped in the stepped hole position inside the drill pipe joint to achieve positioning of the socket. Communication cables are respectively passed through the integrated pin and the positioning joint assembly to achieve transmission of electrical signals from the communication cable of one section of the drill pipe joint to the communication cable of another section.

2. The connecting device for internal communication cables of an intelligent drill pipe joint according to claim 1, characterized in that: The integrated pin includes a magnetic coupling component, a plastic tube and a pin component, and the magnetic coupling component, the plastic tube and the pin component are connected in sequence.

3. The connecting device for internal communication cables of an intelligent drill pipe joint according to claim 2, characterized in that: The magnetic coupling assembly includes a magnetic coupler, a conductive coil, a magnetic coupler base and an adapter joint. The magnetic coupler is installed in the magnetic coupler base, the conductive coil is placed in the magnetic coupler, and the magnetic coupler, the conductive coil and the magnetic coupler base are sealed with sealant into one. An opening is provided on the magnetic coupler base. One end of the adapter joint is positioned with the magnetic coupler base through a stepped hole and is connected to form a whole by welding. The other end of the adapter joint and the end of the pin assembly are respectively provided with a pagoda joint. The two ends of the plastic tube are respectively connected to the other end of the adapter joint and the pin assembly through the pagoda joint, so that the first section of the communication cable is led out of the opening, and the first section of the communication cable is connected to the pin assembly after passing through the adapter joint and the plastic tube.

4. The connecting device for internal communication cables of an intelligent drill pipe joint according to claim 3, characterized in that: The pin assembly includes a core-level metal pin, a first rubber insulation layer, a first metal conductive layer, a second rubber insulation layer and a first metal protective shell. One end of the core-level metal pin and the first metal conductive layer is provided with a pin terminal. The first section of communication cable passes through the magnetic coupler base, the adapter connector, and the plastic tube in sequence and is connected to the pin terminal. The second rubber insulation layer is provided with an insulating convex ring, which is inserted into the socket. The end of the first metal protective shell is provided with the pagoda joint. The plastic tube is connected to the first metal protective shell through the pagoda joint. The first metal protective shell is provided with a first outer ring O-ring groove, and a first rubber O-ring is installed in the first outer ring O-ring groove.

5. The connecting device for internal communication cables of an intelligent drill pipe joint according to claim 4, characterized in that: The socket includes a core-level metal jack, a third rubber insulation layer, a second metal conductive layer, a fourth rubber insulation layer and a second metal protective shell arranged from the inside to the outside. The metal layer of the core-level metal jack is provided with a socket terminal at the end of the second metal conductive layer. The second section of the communication cable is connected to the socket terminal. The core-level metal pin is inserted into the metal jack. The second metal conductive layer is butt-connected to the first metal conductive layer. An insulating groove is provided at one end of the fourth rubber insulation layer. The insulating convex ring is provided in the insulating groove for sealing connection. A second outer ring O-ring groove is provided on the second metal protective shell. A second rubber O-ring is installed in the second outer ring O-ring groove. An external thread is provided on the second metal protective shell. The second metal protective shell is connected to the positioning joint assembly through the thread.

6. The connecting device for internal communication cables of an intelligent drill pipe joint according to claim 5, characterized in that: The positioning joint assembly includes a positioning joint and a cable protection tube. The two ends of the positioning joint are respectively connected to the second metal protective shell and the cable protection tube through threads. The positioning joint is arranged at the stepped hole position inside the drill pipe joint. The positioning joint and the cable protection tube are respectively provided with a cavity, which is used for the second section of the communication cable to pass through and be connected to the socket terminal.

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