Mutual inductance coil device for communication drill rod and communication drill rod

Abstract

The invention provides a mutual inductance coil device for a communication drill rod and the communication drill rod, the mutual inductance coil device can be installed on a male head or a female head of the communication drill rod, and the mutual inductance coil device comprises a coil assembly, a female joint and a male joint. The coil assembly comprises a first sealing shell, an annular magnetic core and a coil wound on the annular magnetic core, the male connector comprises a third sealing shell and a plug, and the female connector comprises a second sealing shell and a socket. The third sealing shell is connected with the first sealing shell, one end of the coil is grounded through the first sealing shell, and the other end of the coil is electrically connected with the plug in the third sealing shell. The second sealing shell is fixed in the male head or the female head of the drill rod, and the sockets in the female joints located at the two ends of the drill rod are electrically connected through internal first wires. When two drill rods are in butt joint, the plug of the male connector is inserted into the socket of the female connector, so that the coils at the two ends form a closed electric connection path. Adjacent mutual inductance coils are connected through excitation mutual inductance, and electric signal transmission can be completed without physical contact.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas drilling engineering, and particularly relates to a mutual inductor device for a communication drill rod and a communication drill rod. BACKGROUND

[0002] In the exploration and development of oil and gas, measurement while drilling (MWD) and logging while drilling (LWD) technologies are the core of modern intelligent drilling. These technologies can obtain engineering parameters and geological parameters at the drill bit in real time, and transmit these data to the ground control system. Based on the obtained real-time data, the developer can conduct accurate geological steering, optimize the drilling trajectory, effectively avoid drilling risks, and ultimately maximize oil and gas recovery.

[0003] In order to realize high-speed, real-time, and bidirectional data communication between the ground and the downhole measurement tool, a communication drill rod emerges as the times require. The communication drill rod integrates a data transmission unit inside the structure of a traditional drill rod, and an electrical coupler is usually arranged at the pin and box of each drill rod, and a wire is embedded in the drill rod body. When a plurality of drill rods are connected in series through threads to form a drill string, the electrical couplers and wires inside the drill rods are also connected in series, forming a complete data transmission channel from the ground equipment to the downhole instrument.

[0004] A common scheme for realizing electrical connection of the pin and box of a drill rod in the prior art is to use a conductive ring type electrical coupler in contact. That is, a ring-shaped conductive contact surface is arranged on the pin and box of the drill rod. When the drill rods are connected and fastened, the electrical connection is established by physical contact between the conductive ring on the pin and the conductive ring on the box, and at the same time, it is necessary to ensure that the contact area is completely insulated from the external drilling fluid environment to prevent short circuit.

[0005] However, this conductive ring type electrical coupler scheme in contact has significant inherent defects. For example, in actual drilling operations, the drill rod connection threads are smeared with thread grease, and the solid particles such as cuttings and barite contained in the drilling fluid will inevitably contaminate the joint surface. During repeated connection and disconnection of the drill rods, these contaminants will seriously adhere to the contact surface of the conductive ring, causing the contact resistance to increase sharply, and even causing signal transmission to be interrupted or completely failed. In addition, mechanical wear, corrosion and other problems will further reduce the reliability and service life of the electrical connection. Therefore, this scheme, which has very high requirements for the cleanliness and insulation sealing of the contact surface, is extremely impractical in harsh and severely contaminated drilling sites, and seriously restricts the reliability and large-scale popularization and application of the communication drill rod technology.

[0006] Therefore, there is an urgent need for a new communication drill rod electrical connection scheme that can overcome the defects of the existing conductive ring technology and still ensure stable and reliable electrical signal transmission in harsh drilling environments. SUMMARY

[0007] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a mutual inductance coil device for a communication drill pipe, aiming to solve the problem that the contact surface cleanliness and insulation sealing requirement of the contact conductive ring type electrical coupler used by the existing communication drill pipe is extremely high, resulting in poor reliability in harsh drilling conditions.

[0008] The present application provides a mutual inductance coil device for a communication drill pipe, which is used to be arranged in a male head or a female head of the communication drill pipe, the male head and the female head of the communication drill pipe are both provided with a first annular groove, the groove bottom of the first annular groove is provided with a blind hole extending along the axial direction of the communication drill pipe, the communication drill pipe is further provided with a first threading hole communicating two blind holes, the first threading hole is used to thread a first wire, and the mutual inductance coil device comprises: a coil assembly, comprising a first sealing shell, a coil and an annular magnetic core, the first sealing shell is an annular structure, and the first sealing shell is arranged in the first annular groove, the annular magnetic core is arranged in the first sealing shell, a plurality of turns of a second wire are wound around the annular magnetic core to form the coil, and one end of the second wire is grounded through the first sealing shell; a female connector, which is detachably connected to the bottom of the blind hole of the communication drill pipe, the female connector comprises a second sealing shell and a socket, the socket is arranged in the second sealing shell, and the plug-in end of the socket faces the opening end of the blind hole, the end of the socket away from the plug-in end is used to be electrically connected with the first wire, and the connection point is located in the second sealing shell; a male connector, which comprises a third sealing shell and a plug, the third sealing shell is detachably connected with the first sealing shell, one end of the plug away from the plug-in end is located in the third sealing shell, and the plug-in end of the plug is located outside the end of the third sealing shell away from the first sealing shell, the other end of the second wire is electrically connected with the end of the plug away from the plug-in end in the third sealing shell, the third sealing shell is used to be inserted into the blind hole, and the plug is used to be plug-in connected with the socket in the second sealing shell.

[0009] According to the mutual inductance coil device for a communication drill pipe provided by the present application, the first sealing shell is provided with a second annular groove away from one side of the communication drill pipe, the second annular groove is provided with a second threading hole penetrating through both sides of the first sealing shell, the second threading hole corresponds to the arrangement position of the third sealing shell, the annular magnetic core is arranged in the second annular groove, one end of the second wire wound around the annular magnetic core enters the third sealing shell through the second threading hole, and the second annular groove is filled with insulation sealing material.

[0010] The mutual inductance coil device for the communication drill rod provided by the application is characterized in that: one side of the first sealing shell connected with the third sealing shell is further provided with a wire slot, and the first sealing shell is further provided with a third wire-through hole communicating with the second annular slot and the wire slot, and the other end of the second wire arranged on the annular magnetic core enters the wire slot through the third wire-through hole and is electrically connected with the first sealing shell in the wire slot.

[0011] The mutual inductance coil device for the communication drill rod provided by the application is characterized in that: the wire slot is provided with a grounding bolt, and the grounding bolt is used for fixing the end of the second wire in the wire slot.

[0012] The mutual inductance coil device for the communication drill rod provided by the application is characterized in that: the wire slot is provided with a grounding connector, the grounding connector comprises a fourth sealing shell and a grounding pin, one end of the second wire entering the wire slot is connected with the grounding pin in the fourth sealing shell, and the other end of the grounding pin is connected with the grounding bolt through a third wire.

[0013] The mutual inductance coil device for the communication drill rod provided by the application is characterized in that: the annular magnetic core comprises a plurality of sub-magnetic cores, the sub-magnetic cores are U-shaped, and the openings of the sub-magnetic cores are directed to the opening side of the second annular slot.

[0014] The mutual inductance coil device for the communication drill rod provided by the application is characterized in that: one side of the first sealing shell connected with the third sealing shell is further provided with a rotation-stopping pin, the communication drill rod is provided with a pin hole corresponding to the rotation-stopping pin, and the rotation-stopping pin is inserted into the pin hole.

[0015] The mutual inductance coil device for the communication drill rod provided by the application is characterized in that: one side of the first sealing shell close to the communication drill rod is further provided with an elastic member, and when the elastic member is pressed, the elastic member is used for providing a force for the first sealing shell to move away from the communication drill rod.

[0016] The mutual inductance coil device for the communication drill rod provided by the application is characterized in that: the third sealing shell is connected with the first sealing shell through a wire-through screw rod.

[0017] The application further provides a communication drill rod, which comprises a drill rod body, two ends of the drill rod body are provided with the mutual inductance coil device for the communication drill rod as described above, and the sockets of the female connectors of the two mutual inductance coil devices are electrically connected through a first wire inside the drill rod body.

[0018] The application has the following advantages due to the above technical scheme: The mutual inductor device for the communication drill rod provided by the application is installed as follows: first, the end of the first wire in the first through hole of the communication drill rod is electrically connected with the socket of the female connector, and the connection point is located in the second sealing shell; then, the female connector is installed at the bottom of the blind hole, and the plug end of the socket faces the open end of the blind hole; then, the male connector is inserted into the blind hole; finally, the plug of the male connector is connected with the socket of the female connector in the second sealing shell, so that the electrical connection between the plug and the socket is achieved. When the plug and the socket are connected, the coil assembly is located in the first annular groove at the end of the communication drill rod. The coil assembly comprises a first sealing shell, a coil and an annular magnetic core. The first sealing shell is annular, and is used in cooperation with the first annular groove. The annular magnetic core is arranged in the first sealing shell, and a plurality of turns of the second wire are wound in the annular magnetic core to form the coil. One end of the second wire is electrically connected with the first sealing shell and grounded, and the other end of the second wire enters the third sealing shell and is electrically connected with the plug, so that the electrical connection between the plug and the first wire is achieved through the plug and the socket. The annular magnetic core and the coil are sealed in the first sealing shell, the connection point between the plug and the second wire is sealed in the third sealing shell, and the plug connection position of the plug and the socket and the connection point of the socket and the first wire are sealed in the second sealing shell. Therefore, the reliability of the mutual inductor device can be improved in the harsh downhole operation environment. In the actual scene, the male head and the female head of each communication drill rod are respectively provided with the mutual inductor device. Starting from the grounding point of the mutual inductor device arranged in the male head, the current passes through the coil, the plug and the socket of the mutual inductor device arranged in the male head, and then passes through the first wire in the communication drill rod. The current passes through the socket, the plug, the coil and the grounding point of the mutual inductor device arranged in the female head, and the grounding points of the two are electrically connected with the drill rod, so that a loop is finally formed. When the two communication drill rods are connected, the two mutual inductor devices at the connection position contact each other and transmit signals through excitation mutual inductance, so that the electrical signal transmission effect is achieved without contact. The connection failure caused by the attachment of pollutants or mechanical wear, corrosion and the like is avoided.

[0019] Further, in the communication drill rod provided by the application, the mutual inductor device for the communication drill rod is arranged, so that the same advantages as described above are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1is a connection diagram of a communication drill pipe provided with a mutual inductor coil device according to an embodiment of the present application Figure 1 ; Figure 2 is a connection diagram of a communication drill pipe provided with a mutual inductor coil device according to an embodiment of the present application Figure 2 ; Figure 3 is a front view of a mutual inductor coil device according to an embodiment of the present application Figure 4 is a top view of a mutual inductor coil device according to an embodiment of the present application Figure 5 is a left view of a mutual inductor coil device according to an embodiment of the present application Figure 6 is a right view of a mutual inductor coil device according to an embodiment of the present application Figure 7 is a right view of a mutual inductor coil device without an elastic rubber ring according to an embodiment of the present application

[0022] Reference signs: 100: communication drill pipe; 210: first sealing shell; 211: second annular groove; 212: second threading hole; 213: third threading hole; 214: wire slot; 215: grounding bolt; 216: rotation-stopping pin; 220: coil; 230: annular magnetic core; 310: second sealing shell; 320: socket; 410: third sealing shell; 420: plug; 510: fourth sealing shell; 520: grounding pin; 600: elastic rubber ring; 700: threading screw rod DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0024] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0026] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between 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.

[0027] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, a person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0029] The mutual inductor device for the communication drill rod provided by the present application, when installed, first electrically connects the end of the first wire in the first wire hole of the communication drill rod with the socket of the female connector, and the connection point is located in the second sealing shell, then installs the female connector to the bottom of the blind hole, at this time the plug end of the socket faces the opening end of the blind hole. Then insert the male connector into the blind hole, finally, the plug of the male connector is connected with the socket of the female connector, realizing the electrical connection of the plug and the socket. When the plug and the socket are connected, the coil assembly is also located in the first annular groove at the end of the communication drill rod. The coil assembly includes a first sealing shell, a coil and an annular magnetic core, the first sealing shell is an annular structure, which is matched and installed with the first annular groove. The annular magnetic core is arranged in the first sealing shell, and a plurality of turns of the second wire are wound in the annular magnetic core to form a coil. One end of the second wire is electrically connected with the first sealing shell for grounding, and the other end of the second wire enters the third sealing shell and is electrically connected with the plug, realizing the electrical connection with the first wire through the plug and the socket. The annular magnetic core and the coil are sealed in the first sealing shell, the connection point of the plug and the second wire is sealed in the third sealing shell, and the plug and the socket are connected, and the connection point of the socket and the first wire is sealed in the second sealing shell, so that the reliability of the mutual inductor device can be improved in harsh downhole operation. In actual scenarios, the male head and the female head of each communication drill rod are respectively provided with the mutual inductor device as above, starting from the grounding point of the mutual inductor device arranged in the male head, the current passes through the coil, the plug and the socket of the mutual inductor device arranged in the male head in turn, then passes through the first wire in the communication drill rod, and then passes through the socket, the plug, the coil and the grounding point of the mutual inductor device arranged in the female head, the grounding points of the two are electrically connected with the drill rod, finally forming a loop. When the two communication drill rods are connected, the two mutual inductor devices at the connection position contact each other and transmit signals through excitation mutual inductance, realizing the effect that the two can transmit electrical signals without contact, and the problem of connection failure caused by the attachment of pollutants or mechanical wear, corrosion and the like.

[0030] The following will be described in combination with Figures 1 to 7The present invention describes a mutual inductance coil device for a communication drill pipe and a communication drill pipe.

[0031] The communication drill rod 100 has a male end and a female end at its two ends. When two adjacent communication drill rods 100 are connected, the male end of one communication drill rod 100 is inserted into the female end of the other communication drill rod 100 to complete the connection. Each end of the communication drill rod 100 is provided with a first annular groove. The bottom of the first annular groove is provided with a blind hole extending along the axial direction of the communication drill rod 100. Inside the communication drill rod 100, between two blind holes, is a first wire-passing hole. The first wire-passing hole connects the two blind holes, and a first wire is passed through the first wire-passing hole.

[0032] The mutual inductance coil device for communication drill pipe provided in the embodiments of the present invention includes a coil assembly, a female connector, and a male connector.

[0033] The coil assembly includes a first sealed housing 210, a coil 220, and an annular magnetic core 230. The first sealed housing 210 is an annular structure used to insert into a first annular groove at the end of the communication drill pipe 100. The annular magnetic core 230 is disposed within the first sealed housing 210, and multiple turns of a second wire are wound inside the annular magnetic core 230, forming the coil 220. The coil 220 and the annular magnetic core 230 are sealed within the first sealed housing 210 to prevent damage under complex downhole conditions. One end of the second wire is electrically connected to the first sealed housing 210. When the first sealed housing 210 enters the first annular groove of the communication drill pipe 100, the end of the second wire connected to the first sealed housing 210 is electrically connected to the communication drill pipe 100 through the first sealed housing 210, thereby achieving a grounding effect.

[0034] The male connector includes a third sealing housing 410 and a plug 420. One end of the third sealing housing 410 is detachably connected to the first sealing housing 210, and its position corresponds to the position of the blind hole. The end of the plug 420 away from the insertion end is sealed inside the end of the third sealing housing 410 away from the first sealing housing 210. The insertion end of the plug 420 extends out of the third sealing housing 410 in a direction away from the first sealing housing 210. The other end of the second wire passes through the third sealing housing 410 and is soldered to the end of the plug 420 away from the insertion end inside the third sealing housing 410. Since the soldering point is located inside the third sealing housing 410, it prevents the soldering point from contacting the outside.

[0035] The female connector includes a second sealing housing 310 and a socket 320. The socket 320 is disposed inside the second sealing housing 310. The end of the socket 320 away from the plug end is used for welding connection with the end of the first wire. The welding point is located inside the second sealing housing 310 to prevent the welding point from contacting the outside.

[0036] For example, the mutual inductor coil device is installed in the female head of the communication drill pipe 100. During installation, the first wire in the first wire hole is arranged in the female head and inserted into the second sealing shell 310, and is welded and connected with the socket 320 of the female joint. Then, the second sealing shell 310 with the socket 320 is inserted into the blind hole of the female head of the communication drill pipe 100, and is fixed in the blind hole, for example, the two can be connected through threads. After connection, the plug end of the socket 320 faces the opening end of the blind hole.

[0037] Then, the male joint is aligned with the blind hole of the female head of the communication drill pipe 100 and is inserted into the blind hole until the plug 420 of the male joint is connected with the socket 320 of the female joint. At this time, the first sealing shell 210 also enters the first annular groove of the female head of the communication drill pipe 100.

[0038] It should be noted that the male joint and the female joint are connected through the second sealing shell 310. In this way, the connection part can be sealed in the second sealing shell 310 to prevent contact with the outside.

[0039] The male head and the female head of each communication drill pipe 100 are provided with the mutual inductor coil device as described above, and the method of connecting the mutual inductor coil device to the male head and the female head of the communication drill pipe 100 is the same.

[0040] When the male head and the female head of the communication drill pipe 100 are connected with the mutual inductor coil device, the electrical principle is as follows: The current flow from the grounding point of the coil 220 of the mutual inductor coil device arranged at the male head of the communication drill pipe 100 is as follows: the grounding point of the coil of the mutual inductor coil device at the male head of the communication drill pipe 100→ the coil 220→ the plug 420 of the male joint→ the socket 320 of the female joint→ the first wire in the first wire hole inside the communication drill pipe 100→ the socket 320 of the female joint of the mutual inductor coil device at the female head of the communication drill pipe 100→ the plug 420 of the male joint→ the coil 220→ the grounding point of the coil→ the shell of the communication drill pipe 100→ the grounding point of the coil of the mutual inductor coil device at the male head of the communication drill pipe 100, forming a current loop.

[0041] When the male head and the female head of two communication drill pipes 100 are connected, the mutual inductor coil device at the male head of one communication drill pipe 100 and the mutual inductor coil device at the female head of the other communication drill pipe 100 transmit signals through excitation mutual inductance, achieving the effect that the two can transmit electrical signals without contact, and the connection will not fail due to the attachment of pollutants or mechanical wear, corrosion, etc.

[0042] In some embodiments, the first sealing shell 210 is provided with a second annular groove 211 on the side away from the communication drill pipe 100, the second annular groove 211 is provided with a second wire hole 212 penetrating through both sides of the first sealing shell 210, the second wire hole 212 corresponds to the setting position of the third sealing shell 410, the annular magnetic core 230 is arranged in the second annular groove 211, one end of the second wire wound on the annular magnetic core 230 enters the third sealing shell 410 through the second wire hole 212, and the second annular groove 211 is filled with insulating sealing material.

[0043] Specifically, the first sealing shell 210 is annular, the second annular groove 211 can be arranged on the left side of the first sealing shell 210, the second annular groove 211 is provided with a second wire hole 212 extending in the left-right direction, i.e. in the axial direction of the first sealing shell 210, the second wire hole 212 communicates the left and right sides of the first sealing shell 210. The third sealing shell 410 is a cylindrical structure, the third sealing shell 410 extends in the left-right direction, and the left end of the third sealing shell 410 is detachably connected with the right side of the first sealing shell 210, the connection position corresponds to the position of the second wire hole 212, i.e. when the first sealing shell 210 is connected with the third sealing shell 410, the second wire hole 212 communicates the second annular groove 211 and the inside of the third sealing shell 410.

[0044] The annular magnetic core 230 is arranged in the second annular groove 211, and the second wire is wound on the annular magnetic core 230 for multiple turns to form a coil 220 finally, one end of the second wire is electrically connected to the ground of the first sealing shell 210, and the other end passes through the first sealing shell 210 to the right through the second wire hole 212, and then enters the third sealing shell 410.

[0045] In order to realize the insulating sealing of the second wire, after the annular magnetic core 230 and the coil 220 are arranged in the second annular groove 211, rubber vulcanization filling can be used.

[0046] Further, the first sealing shell 210 is also provided with a wire slot 214 on the side close to the communication drill pipe 100, the first sealing shell 210 is also provided with a third wire hole 213 communicating the second annular groove 211 and the wire slot 214, the other end of the second wire wound on the annular magnetic core 230 enters the wire slot 214 through the third wire hole 213, and is electrically connected with the first sealing shell 210 in the wire slot 214.

[0047] Specifically, still taking the previous embodiment as an example, a wire slot 214 can be arranged on the right side of the first sealing shell 210, the wire slot 214 can be an arc-shaped slot, a third wire-through hole 213 extending along the left-right direction is arranged on the first sealing shell 210, the third wire-through hole 213 is communicated with the second annular slot 211 and the wire slot 214, and one end of the second wire for grounding passes through the first sealing shell 210 to the right through the third wire-through hole 213 and then is electrically connected with the first sealing shell 210 in the wire slot 214.

[0048] Further, a grounding bolt 215 can be arranged in the wire slot 214, and the one end of the second wire for grounding is fixed in the wire slot 214 through the grounding bolt 215.

[0049] Further, a grounding connector can also be arranged in the wire slot 214, the grounding connector includes a fourth sealing shell 510 and a grounding pin 520, the one end of the second wire entering the wire slot 214 is connected with the grounding pin 520 in the fourth sealing shell 510, and the other end of the grounding pin 520 is connected with the grounding bolt 215 through a third wire.

[0050] During installation, the one end of the second wire entering the wire slot 214 passes through the fourth sealing shell 510, then the second wire is welded with the grounding pin 520, after welding, the connection point of the grounding pin 520 and the second wire is sealed in the fourth sealing shell 510. The other end of the grounding pin 520 is connected with the grounding bolt 215 through the third wire.

[0051] In some embodiments, the annular magnetic core 230 includes a plurality of sub-magnetic cores, the sub-magnetic core is U-shaped, and the opening of the sub-magnetic core faces the opening side of the second annular slot 211.

[0052] Specifically, taking the second annular slot 211 facing left as an example, the opening of the sub-magnetic core is arranged to face left, and 50 sub-magnetic cores can be closely arranged along the circumferential direction of the second annular slot 211 to finally form the annular magnetic core 230.

[0053] In some embodiments, the first sealing shell 210 further includes a rotation-stopping pin 216 arranged on the side close to the communication drill rod 100, the communication drill rod 100 is provided with a pin hole corresponding to the rotation-stopping pin 216, and the rotation-stopping pin 216 is inserted into the pin hole.

[0054] Specifically, at least one rotation-stopping pin 216 is arranged on the side of the first sealing shell 210 connected with the third sealing shell 410, and preferably two rotation-stopping pins 216 are arranged. A pin hole is arranged in the first annular slot of the communication drill rod 100, and the position of the pin hole corresponds to the position of the rotation-stopping pin 216. When the first sealing shell 210 enters the first annular slot, the rotation-stopping pin 216 is first aligned with the pin hole, and finally the rotation-stopping pin 216 is inserted into the pin hole to limit the relative rotation of the first sealing shell 210 and the drill rod.

[0055] In some embodiments, the first sealing shell 210 is further provided with an elastic member near the side close to the communication drill pipe 100, and the elastic member is used to provide a force for the first sealing shell 210 to move away from the communication drill pipe 100 when the elastic member is pressed.

[0056] Specifically, the elastic member can be an elastic rubber ring 600, which is arranged on the side of the first sealing shell 210 close to the communication drill pipe 100. When two communication drill pipes 100 are connected, the two mutual inductance coil devices located between the two communication drill pipes 100 contact each other. During the fastening process, the elastic rubber ring 600 is pressed to provide a force for the corresponding first sealing shell 210 to move away from the communication drill pipe 100, so as to make the two adjacent mutual inductance coil devices closely contact each other.

[0057] In some embodiments, the third sealing shell 410 is connected with the first sealing shell 210 through a threading screw rod 700.

[0058] The first sealing shell 210 is provided with an inner thread in the second threading hole 212, and the third sealing shell 410 is also provided with an inner thread near the end close to the first sealing shell 210. The threading screw rod 700 is provided with an outer thread on the outer side, and is provided with a fourth threading hole penetrating through the threading screw rod 700. During installation, the two ends of the threading screw rod 700 are respectively screwed with the first sealing shell 210 and the third sealing shell 410, and the second guide wire enters the third sealing shell 410 through the fourth threading hole.

[0059] The embodiments of the present application also provide a communication drill pipe, which comprises a drill pipe body, and the mutual inductance coil device for the communication drill pipe as described above is arranged on both ends of the drill pipe body. The sockets 320 of the female connectors of the two mutual inductance coil devices are electrically connected through the first guide wire inside the drill pipe body. Since the mutual inductance coil device for the communication drill pipe as described above is arranged, the same advantages as described above are achieved, and details are not repeated here.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A mutual inductance coil device for communication drill pipes, characterized in that, The utility model relates to a communication drill rod (100) for setting up the male head or the female head of communication drill rod (100), the male head and the female head of communication drill rod (100) are provided with first annular groove, the groove bottom of first annular groove is provided with the blind hole along the axial extension of communication drill rod (100), communication drill rod (100) is also provided with the first threading hole of intercommunication two blind holes, the first threading hole is used for threading first wire, mutual inductance coil device includes: Coil assembly, including first sealed shell (210), coil (220) and annular magnetic core (230), first sealed shell (210) is annular structure, and first sealed shell (210) is used for setting in first annular groove, annular magnetic core (230) is arranged in first sealed shell (210), the coil (220) is formed by the second wire of multiple turns around the annular magnetic core (230) inside, one end of second wire passes through first sealed shell (210) and is grounded; Female joint, the female joint is used for detachable connection in the bottom of the blind hole of communication drill rod (100), the female joint includes second sealed shell (310) and socket (320), socket (320) is arranged in second sealed shell (310), and the plug end of socket (320) is towards the opening end of blind hole, the end of socket (320) away from the plug end is used for electric connection with first wire, and the connection point is located in second sealed shell (310); Male joint, the male joint includes third sealed shell (410) and plug (420), third sealed shell (410) is detachably connected with first sealed shell (210), the end of plug (420) away from the plug end is located in third sealed shell (410), and the plug end of plug (420) is located outside the end of third sealed shell (410) away from first sealed shell (210), the other end of second wire is electrically connected with the end of plug (420) away from the plug end in third sealed shell (410), third sealed shell (410) is used for inserting into the blind hole, and plug (420) is used for being connected with socket (320) in second sealed shell (310) in plug connection.

2. The mutual inductor assembly for communication drill pipe of claim 1, wherein, The side of first sealed shell (210) away from communication drill rod (100) is provided with second annular groove (211), second annular groove (211) is provided with second threading hole (212) through both sides of first sealed shell (210), second threading hole (212) corresponds with the setting position of third sealed shell (410), annular magnetic core (230) is arranged in second annular groove (211), one end of second wire around annular magnetic core (230) enters third sealed shell (410) through second threading hole (212), second annular groove (211) is filled with insulating sealing material.

3. The mutual inductor assembly for communication drill pipe of claim 2, wherein, A wire groove (214) is provided on the side where the first sealing housing (210) is connected to the third sealing housing (410). A third wire hole (213) is also provided on the first sealing housing (210) to connect the second annular groove (211) and the wire groove (214). The other end of the second wire wound on the annular magnetic core (230) enters the wire groove (214) through the third wire hole (213) and is electrically connected to the first sealing housing (210) in the wire groove (214).

4. The mutual inductor assembly for communication drill pipe of claim 3, wherein, A grounding bolt (215) is provided in the wire groove (214), and the grounding bolt (215) is used to fix the end of the second conductor in the wire groove (214).

5. The mutual inductor assembly for communication drill pipe of claim 4, wherein, A grounding connector is provided in the wire groove (214). The grounding connector includes a fourth sealing housing (510) and a grounding pin (520). One end of the second wire enters the wire groove (214) and is connected to the grounding pin (520) in the fourth sealing housing (510). The other end of the grounding pin (520) is connected to the grounding bolt (215) through a third wire.

6. The mutual inductor assembly for communication drill pipe of claim 1, wherein, The annular magnetic core (230) includes multiple sub-cores, each sub-core being U-shaped, with its opening facing the opening side of the second annular groove (211).

7. The mutual inductor assembly for communication drill pipe of claim 1, wherein, An anti-rotation pin (216) is provided on the side where the first sealing housing (210) is connected to the third sealing housing (410). The communication drill rod (100) is provided with a pin hole at the position corresponding to the anti-rotation pin (216), and the anti-rotation pin (216) is inserted into the pin hole.

8. The mutual inductor assembly for communication drill pipe of claim 1, wherein, The first sealing housing (210) is also provided with an elastic element on the side near the communication drill rod (100). When the elastic element is compressed, the elastic element is used to provide the first sealing housing (210) with a force to move away from the communication drill rod (100).

9. The mutual inductor assembly for communication drill pipe of claim 1, wherein, The third sealing housing (410) is connected to the first sealing housing (210) via a threaded screw (700).

10. A communication drill pipe, characterized by, The drill pipe body includes a drill pipe body, and both ends of the drill pipe body are provided with mutual inductance coil devices for communication drill pipes as described in any one of claims 1 to 9. The sockets (320) of the female connectors of the two mutual inductance coil devices are electrically connected through a first wire inside the drill pipe body.

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