A magnetic guidance while drilling transmitting antenna

Abstract

The application discloses a magnetic guiding transmitting antenna while drilling, which comprises a conductive cable, a transmitting electrode elastic conductor, a transmitting electrode, a recovery electrode, a recovery electrode elastic conductor, the conductive cable is connected with the transmitting electrode elastic conductor and the recovery electrode elastic conductor, the conductive cable is used for receiving transmitting alternating current and recovery alternating current and transmitting the same to the transmitting electrode elastic conductor and the recovery electrode elastic conductor respectively, the transmitting electrode elastic conductor is connected with the transmitting electrode, the recovery electrode elastic conductor is connected with the recovery electrode, the transmitting electrode elastic conductor is used for transmitting the transmitting alternating current to the transmitting electrode, and the recovery electrode elastic conductor is used for transmitting the recovery alternating current to the recovery electrode, and the transmitting electrode transmits the transmitting alternating current to the recovery electrode through a stratum. The magnetic guiding transmitting antenna while drilling can effectively improve the efficiency of drilling operation and effectively reduce the cost of drilling operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of measurement while drilling, in particular to a magnetic guidance transmitting antenna while drilling. BACKGROUND

[0002] The magnetic guidance measurement technology is developed on the basis of the traditional logging technology. The technology drills a new well near an old well, measures the positional relationship between the new well and the old well through magnetic induction, adjusts the drilling trajectory of the new well, and finally realizes the approach of the new well to the old well until the two wells are connected. In the specific construction process, the new well is first drilled in the direction of the old well. When the drilling position is close to the old well, the drilling tool is taken out from the new well, and the magnetic guidance measurement tool carried by the cable is lowered. When the tool reaches the bottom of the well, the ground power is started, and the current transmitted by the cable is used to excite discharge. The discharge current propagates in the stratum and is conducted to the casing of the old well. The current in the casing induces a magnetic field in the stratum. The detection sub of the magnetic guidance measurement tool can detect and analyze the magnetic field to calculate the distance and direction between the new well and the casing of the old well, and judge the positional relationship between the two wells. After the positional relationship between the two wells is determined, the magnetic guidance measurement tool is taken out from the wellbore, and the drilling tool is lowered again to drill in the predetermined direction. The above process is repeated until the two wells are connected, and the old well is reused.

[0003] Since the magnetic guidance measurement tool is lowered into the bottom of the new well by the cable, the current excited by the ground is transmitted to the stratum through the cable, and the induced current in the loop of the cable is used to judge the positional relationship between the new well and the old well. The setting of the cable causes the drilling tool to be unable to set the drill string, and the cable has small hardness and is unable to apply pressure to the drill bit through the cable, so that the magnetic guidance measurement tool of this kind only has the measurement function and does not have the drilling capacity. Therefore, after the measurement is completed, the drilling tool needs to be taken out of the wellbore and replaced with the drilling tool for drilling. After drilling for a distance, the drilling tool is taken out and replaced with the magnetic guidance measurement tool for measurement. The above process is repeated, which seriously affects the operation efficiency and increases the drilling cost. SUMMARY

[0004] The present application provides a magnetic guidance transmitting antenna while drilling, which can be integrated with the traditional magnetic guidance measurement tool and the drilling tool to solve the problems of low operation efficiency and high cost of the existing drilling operation.

[0005] In a first aspect, the present application provides a magnetic guidance transmitting antenna while drilling, which comprises: a conductive cable, a transmitting electrode elastic conductor, a transmitting electrode, a recovery electrode, and a recovery electrode elastic conductor.

[0006] The conductive cable is connected with the transmitting electrode elastic conductor and the recovery electrode elastic conductor. The conductive cable is used to receive the transmitting alternating current and the recovery alternating current and transmit them to the transmitting electrode elastic conductor and the recovery electrode elastic conductor, respectively.

[0007] The emitter elastic conductor and the emitter connection, the recovery elastic conductor and the recovery connection, the emitter elastic conductor is used for transmitting the emission alternating current to the emitter, and the recovery elastic conductor is used for transmitting the recovery alternating current to the recovery pole;

[0008] The emitter transmits the emission alternating current to the recovery pole through the stratum.

[0009] Optionally, the emitter elastic conductor comprises a first fixed sleeve, a first sliding sleeve, a first arc-shaped elastic piece and a first pressure-resistant shell; the first arc-shaped elastic piece is connected with the conductive cable;

[0010] In the length direction of the first pressure-resistant shell, the first fixed sleeve and the first sliding sleeve are arranged on the first pressure-resistant shell in a spaced manner, the first arc-shaped elastic piece is connected between the first fixed sleeve and the first sliding sleeve, and the first sliding sleeve slides relative to the first pressure-resistant shell, so that the first arc-shaped elastic piece is in contact with the emitter.

[0011] Optionally, the recovery elastic conductor comprises a second fixed sleeve, a second sliding sleeve, a second arc-shaped elastic piece and a second pressure-resistant shell; the second arc-shaped elastic piece is connected with the conductive cable;

[0012] In the length direction of the second pressure-resistant shell, the second fixed sleeve and the second sliding sleeve are arranged on the second pressure-resistant shell in a spaced manner, the second arc-shaped elastic piece is connected between the second fixed sleeve and the second sliding sleeve, and the second sliding sleeve slides relative to the second pressure-resistant shell, so that the second arc-shaped elastic piece is in contact with the recovery pole.

[0013] Optionally, the while-drilling magnetic guiding emission antenna further comprises a first insulating sheath;

[0014] In the length direction of the while-drilling magnetic guiding emission antenna, the first insulating sheath is arranged at both ends of the emitter elastic conductor, and is used for limiting the emission alternating current in the emitter elastic conductor.

[0015] Optionally, the while-drilling magnetic guiding emission antenna further comprises a second insulating sheath;

[0016] In the length direction of the while-drilling magnetic guiding emission antenna, the second insulating sheath is arranged at both ends of the recovery elastic conductor, and is used for limiting the recovery alternating current in the recovery elastic conductor.

[0017] Optionally, the while-drilling magnetic guiding emission antenna further comprises a first insulating dipole sub;

[0018] In the length direction of the while-drilling magnetic guiding emission antenna, the first insulating dipole sub is arranged at both ends of the emitter and the recovery pole, and is used for insulating the emitter and the recovery pole.

[0019] Optionally, the first insulating dipole sub comprises a first double female drill collar joint, a first double male drill collar joint, a first insulating coating, a first inner insulator and a first outer insulator.

[0020] The threaded connection of the first double female drill collar joint and the first double male drill collar joint is provided with a first insulating coating, the internal joint of the first double female drill collar joint and the first double male drill collar joint is provided with a first internal insulator, and the external joint of the first double female drill collar joint and the first double male drill collar joint is provided with a first external insulator.

[0021] Optionally, the while-drilling magnetic orientation transmitting antenna further comprises a second insulating dipole sub;

[0022] In the length direction of the while-drilling magnetic orientation transmitting antenna, the second insulating dipole sub is arranged at both ends of the recovery electrode, and is used for insulating the transmitting electrode and the recovery electrode.

[0023] Optionally, the second insulating dipole sub comprises a second double female drill collar joint, a second double male drill collar joint, a second insulating coating, a second internal insulator and a second external insulator.

[0024] The threaded connection of the second double female drill collar joint and the second double male drill collar joint is provided with a second insulating coating, the internal joint of the second double female drill collar joint and the second double male drill collar joint is provided with a second internal insulator, and the external joint of the second double female drill collar joint and the second double male drill collar joint is provided with a second external insulator.

[0025] Optionally, the while-drilling magnetic orientation transmitting antenna further comprises an isolation sub and an adjusting sheath.

[0026] In the length direction of the while-drilling magnetic orientation transmitting antenna, the isolation sub is arranged between the transmitting electrode and the recovery electrode, and is used for adjusting the distance between the transmitting electrode and the recovery electrode.

[0027] The adjusting sheath is arranged inside the isolation sub, and is used for controlling the corresponding connection of the transmitting electrode elastic conductor and the transmitting electrode and the corresponding connection of the recovery electrode elastic conductor and the recovery electrode according to the length change of the isolation sub.

[0028] The technical scheme provided by the embodiment of the present application provides a magnetic directional transmitting antenna while drilling, which comprises a conductive cable, an emitter elastic conductor, an emitter, a recovery pole and a recovery elastic conductor. An alternating current is transmitted to the emitter through the conductive cable and the emitter elastic conductor, and an alternating current is transmitted to the recovery pole through the conductive cable and the recovery elastic conductor. The emitter emits the alternating current into the stratum, and part of the alternating current returns to the recovery pole to form a closed loop. The magnetic directional transmitting antenna while drilling provided by the embodiment of the present application can be used in combination with a conventional magnetic directional measuring tool and a drilling tool, and is used in the communication operation of a new well and an old well. The alternating current forming the closed loop generates an induced current on the casing of the old well, the induced current forms an induced magnetic field, and the distance between the new well and the casing of the old well is analyzed after the magnetic field intensity is detected by a probe sub, so that the drilling direction of the new well is guided. The cable extending from the bottom of the new well to the ground is not needed, the hardness of the magnetic directional transmitting antenna while drilling is high enough, and the magnetic directional transmitting antenna while drilling and the drill string can be controlled together after being connected. The measurement and drilling are performed synchronously in the new well, and the drilling is not needed frequently. The magnetic directional transmitting antenna while drilling provided by the embodiment of the present application can effectively improve the efficiency of the drilling operation and effectively reduce the cost of the drilling operation.

[0029] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is a structural schematic diagram of a magnetic directional transmitting antenna while drilling provided by the embodiment of the present application;

[0032] Figure 2 is a structural schematic diagram of a magnetic directional transmitting antenna while drilling, a magnetic directional measuring tool and a drilling tool provided by the embodiment of the present application;

[0033] Figure 3 is a structural schematic diagram of an emitter elastic conductor provided by the embodiment of the present application;

[0034] Figure 4 is a structural schematic diagram of a recovery elastic conductor provided by the embodiment of the present application;

[0035] Figure 5 is a structural schematic diagram of a first insulating dipole short section provided by an embodiment of the present application;

[0036] Figure 6 is a structural schematic diagram of a second insulating dipole short section provided by an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the personnel in the art without creative labor should belong to the protection scope of the present application.

[0038] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0039] Figure 1 is a structural schematic diagram of a magnetic navigation transmitting antenna while drilling provided by an embodiment of the present application, as Figure 1 shown, the magnetic navigation transmitting antenna while drilling includes a conductive cable (not shown in the figure), a transmitting electrode elastic conductor 107, a transmitting electrode 102, a recovery electrode 103, and a recovery electrode elastic conductor 109. The conductive cable is connected with the transmitting electrode elastic conductor 107 and the recovery electrode elastic conductor 109, and is used to receive transmitting alternating current S1 and recovery alternating current S2 and transmit them to the transmitting electrode elastic conductor 107 and the recovery electrode elastic conductor 109, respectively. The transmitting electrode elastic conductor 107 is connected with the transmitting electrode 102, and the recovery electrode elastic conductor 109 is connected with the recovery electrode 103. The transmitting electrode elastic conductor 107 is used to transmit the transmitting alternating current S1 to the transmitting electrode 102, and the recovery electrode elastic conductor 109 is used to transmit the recovery alternating current S2 to the recovery electrode 103. The transmitting electrode 102 transmits the transmitting alternating current S1 to the recovery electrode 103 through the stratum.

[0040] Specifically, the conductive cable can be arranged in the center of the magnetic navigation while drilling transmitting antenna as a center lead, and the conductive cable can be a wire with an insulating skin. One end of the magnetic navigation while drilling transmitting antenna can be connected to a power generation short section, and the power generation short section is internally provided with a generator. The generator can generate transmitting alternating current S1 and recovering alternating current S2. The joint 105 flows through the transmitting alternating current S1 and the recovering alternating current S2 which are led out from the generator. The transmitting alternating current S1 is conducted to the transmitting electrode 102 through the conductive cable and the transmitting electrode elastic conductor 107. The recovering alternating current S2 is transmitted to the recovering electrode 103 through the conductive cable and the recovering electrode elastic conductor 109. The transmitting alternating current S1 is transmitted by the transmitting electrode 102 into the formation, and a part of the transmitting alternating current S1 in the formation returns to the recovering electrode 103 to form a closed loop.

[0041] The transmitting electrode elastic conductor 107 and the recovering electrode elastic conductor 109 can form a closed loop for the transmitting alternating current S1 and the recovering alternating current S2 in the magnetic navigation while drilling transmitting antenna. The specific path is the transmitting alternating current S1-transmitting electrode elastic conductor 107-transmitting electrode 102-ground-recovering electrode 103-recovering electrode elastic conductor 109-recovering alternating current S2.

[0042] Figure 2 It is a structure schematic diagram of the magnetic navigation while drilling transmitting antenna, the magnetic navigation measuring tool and the drilling tool integrated according to the embodiment of the present application, as shown in Figure 1 and Figure 2 As shown in the figure, one end of the magnetic navigation while drilling transmitting antenna 1 is connected to the drill string 2, and the other end is connected to the power generation short section 5. The power generation short section 5 is internally provided with a turbine generator. During the drilling operation, the mud circulates, and the generator generates the transmitting alternating current S1 and the recovering alternating current S2. The transmitting alternating current S1 is conducted to the transmitting electrode 102 through the conductive cable and the transmitting electrode elastic conductor 107. The recovering alternating current S2 is transmitted to the recovering electrode 103 through the conductive cable and the recovering electrode elastic conductor 109. The transmitting alternating current S1 is transmitted by the transmitting electrode 102 into the formation, and a part of the transmitting alternating current S1 in the formation returns to the recovering electrode 103 to form a closed loop. The alternating current 10 which does not form a closed loop diffuses to the ground and is attenuated. The alternating current 9 which forms a closed loop generates an induced current 12 on the old well casing 11. The induced current 12 forms an induced magnetic field 13. The detection short section 6 detects the magnetic field strength, analyzes the distance between the new well 3 and the old well casing 11, and guides the drilling direction of the new well 3. Figure 2 The center 4 is a drilling platform, the 7 is a screw rod, and the 8 is a drill bit.

[0043] Figure 2 One end of the magnetic navigation while drilling transmitting antenna is connected to the drill string 2. Since the hardness of the magnetic navigation while drilling transmitting antenna is sufficient, the magnetic navigation while drilling transmitting antenna and the drill string 2 can jointly control the drill bit 8 to drill in.

[0044] The technical scheme of the embodiment of the present application provides a magnetic navigation transmitting antenna while drilling, which comprises a conductive cable, an emitter elastic conductor, an emitter, a recovery pole and a recovery elastic conductor. An emitting alternating current is conducted to the emitter through the conductive cable and the emitter elastic conductor, and a recovery alternating current is transmitted to the recovery pole through the conductive cable and the recovery elastic conductor. The emitting alternating current is emitted by the emitter into the stratum, and a part of the emitting alternating current in the stratum returns to the recovery pole to form a closed loop. The magnetic navigation transmitting antenna while drilling provided by the embodiment of the present application can be used in combination with a conventional magnetic navigation measuring tool and a drilling tool, and is used in the communication operation of a new well and an old well. The alternating current forming the closed loop generates an induced current on the old well casing, the induced current forms an induced magnetic field, and the distance between the new well and the old well casing is analyzed after the magnetic field intensity is detected by a probe, so that the drilling direction of the new well is guided. The cable extending from the bottom of the new well to the ground is not needed, the hardness of the magnetic navigation transmitting antenna while drilling is enough to control the drilling bit to drill in combination with the drilling string after the magnetic navigation transmitting antenna while drilling is connected to the drilling string, and the measurement and the drilling are simultaneously performed in the new well, so that the drilling tool is not needed to be frequently lowered. The magnetic navigation transmitting antenna while drilling provided by the embodiment of the present application can effectively improve the efficiency of the drilling operation and effectively reduce the cost of the drilling operation.

[0045] Optionally, on the basis of each of the above embodiments, Figure 3 is a structural schematic diagram of an emitter elastic conductor provided by the embodiment of the present application, as shown in Figure 1 and Figure 3 The emitter elastic conductor 107 comprises a first fixed sleeve 111, a first sliding sleeve 112, a first arc-shaped elastic sheet 113 and a first compression-resistant shell 114. The first arc-shaped elastic sheet 113 is connected to the conductive cable. In the length direction of the first compression-resistant shell 114, the first fixed sleeve 111 and the first sliding sleeve 112 are arranged on the first compression-resistant shell 114 in a spaced manner, the first arc-shaped elastic sheet 113 is connected between the first fixed sleeve 111 and the first sliding sleeve 112, and the first sliding sleeve 112 slides relative to the first compression-resistant shell 114 to make the first arc-shaped elastic sheet 113 contact the emitter 102.

[0046] Specifically, the first fixed sleeve 111 is sleeved on the first compression-resistant shell 114, the first sliding sleeve 112 is also sleeved on the first compression-resistant shell 114, the first arc-shaped elastic sheet 113 is connected between the first fixed sleeve 111 and the first sliding sleeve 112, and the first sliding sleeve 112 can slide on the first compression-resistant shell 114 to change the bending degree of the first arc-shaped elastic sheet 113. The reverse pressure of the first arc-shaped elastic sheet 113 is used to make the first arc-shaped elastic sheet 113 tightly contact the inner wall of the emitter 102, so that the emitting alternating current S1 is conducted to the emitter 102.

[0047] Optionally, on the basis of each of the above embodiments, Figure 4 is a structural diagram of a recycling super-elastic conductor provided by an embodiment of the present application, as shown in Figure 1 and Figure 4 The recycling super-elastic conductor 109 comprises a second fixed sleeve 211, a second sliding sleeve 212, a second arc-shaped elastic piece 213, and a second compression-resistant shell 214. The second arc-shaped elastic piece 213 is connected with the conductive cable. In the length direction of the second compression-resistant shell 214, the second fixed sleeve 211 and the second sliding sleeve 212 are arranged on the second compression-resistant shell 214 in a spaced manner, and the second arc-shaped elastic piece 213 is connected between the second fixed sleeve 211 and the second sliding sleeve 212. The second sliding sleeve 212 slides relative to the second compression-resistant shell 214, so that the second arc-shaped elastic piece 213 is in contact with the recycling pole 103.

[0048] Specifically, the second fixed sleeve 211 is sleeved on the second compression-resistant shell 214, the second sliding sleeve 212 is also sleeved on the second compression-resistant shell 214, the second arc-shaped elastic piece 213 is connected between the second fixed sleeve 211 and the second sliding sleeve 212, and the second sliding sleeve 212 can slide on the second compression-resistant shell 214, so as to change the bending degree of the second arc-shaped elastic piece 213. By using the reverse pressure of the second arc-shaped elastic piece 213, the second arc-shaped elastic piece 213 is tightly fitted with the inner wall of the recycling pole 103, so as to realize the conduction of the recycling alternating current S2 to the recycling pole 103.

[0049] Optionally, on the basis of each of the above embodiments, with reference to Figure 1 the while-drilling magnetic guiding transmitting antenna further comprises a first insulation sheath 106. In the length direction of the while-drilling magnetic guiding transmitting antenna, the first insulation sheath 106 is arranged at both ends of the transmitting pole super-elastic conductor 107, and is used for limiting the transmitting alternating current S1 in the transmitting pole super-elastic conductor 107.

[0050] Specifically, the first insulation sheath 106 is arranged at both ends of the transmitting pole super-elastic conductor 107, which can effectively avoid the transmitting alternating current S1 from being transmitted to the recycling pole super-elastic conductor 109 and the recycling pole 103 through other pipes, and avoid the short circuit between the transmitting pole 102 and the recycling pole 103, so that the while-drilling magnetic guiding transmitting antenna can effectively form an alternating current loop.

[0051] Optionally, on the basis of each of the above embodiments, with reference to Figure 1 the while-drilling magnetic guiding transmitting antenna further comprises a second insulation sheath 206. In the length direction of the while-drilling magnetic guiding transmitting antenna, the second insulation sheath 206 is arranged at both ends of the recycling pole super-elastic conductor 109, and is used for limiting the recycling alternating current S2 in the recycling pole super-elastic conductor 109.

[0052] Specifically, the two ends of the recovery electrode 109 are provided with a second insulating sheath 206, which can effectively avoid the recovery alternating current S2 from being transmitted to the transmitting electrode elastic conductor 107 and the transmitting electrode 102 through other pipes, avoid the short circuit between the transmitting electrode 102 and the recovery electrode 103, and thus make the magnetic navigation transmitting antenna while drilling effectively form an alternating current loop.

[0053] Optionally, on the basis of the above embodiments, continuing to refer to Figure 1 The magnetic navigation transmitting antenna while drilling further comprises a first insulating dipole sub 101. In the length direction of the magnetic navigation transmitting antenna while drilling, the first insulating dipole sub 101 is arranged at the two ends of the transmitting electrode 102, and is used for insulating the transmitting electrode 102 and the recovery electrode 103.

[0054] Specifically, in the length direction of the magnetic navigation transmitting antenna while drilling, the first insulating dipole sub 101 is arranged at the two ends of the transmitting electrode 102, and the transmitting electrode 102 is arranged in an insulated manner, which can insulate the transmitting electrode 102 from other pipes and avoid the short circuit between the transmitting electrode 102 and the recovery electrode 103 through other pipes, so as to make the magnetic navigation transmitting antenna while drilling effectively form an alternating current loop. The first insulating dipole sub 101 is used for insulating the drill collars at the two ends of the first insulating dipole sub 101 from each other, and the first insulating dipole sub 101 needs to have the characteristics of good electrical insulation, high strength and erosion resistance, and can maintain good insulation characteristics under high temperature and high pressure. The first insulating dipole sub 101 is a key unit for insulating the transmitting electrode 102 and the recovery electrode 103 and realizing the alternating current from the transmitting electrode 102 to the recovery electrode 103 through the formation.

[0055] Optionally, on the basis of the above embodiments, Figure 5 is a structural schematic diagram of a first insulating dipole sub provided by the embodiment of the present application, as shown in Figure 1 and Figure 5 The first insulating dipole sub 101 comprises a first double female drill collar joint 115, a first double male drill collar joint 116, a first insulating coating 118, a first inner insulator 117 and a first outer insulator 119. The first insulating coating 118 is arranged at the threaded connection of the first double female drill collar joint 115 and the first double male drill collar joint 116, the first inner insulator 117 is arranged at the internal joint of the first double female drill collar joint 115 and the first double male drill collar joint 116, and the first outer insulator 119 is arranged at the external joint of the first double female drill collar joint 115 and the first double male drill collar joint 116.

[0056] Specifically, the forming method of the first insulating dipole sub 101 is to spray the first insulating coating 118 at the threaded connection of the first double female drill collar joint 115 and the first double male drill collar joint 116, install the first inner insulator 117 at the internal joint of the first double female drill collar joint 115 and the first double male drill collar joint 116, and install the first outer insulator 119 at the external reserved position. The first inner insulator 117 and the first outer insulator 119 are both made of erosion-resistant insulating materials. The first double female drill collar joint 115 and the first double male drill collar joint 116 are rotated and fastened, and attention should be paid to that the first insulating coating 118 cannot be damaged during fastening. After fastening, the insulation resistance between the first double female drill collar joint 115 and the first double male drill collar joint 116 is greater than 30 MΩ, and the first double female drill collar joint 115 and the first double male drill collar joint 116 can be used.

[0057] Optionally, on the basis of each of the above embodiments, with reference to Figure 1 The while-drilling magnetic orientation transmitting antenna further comprises: a second insulating dipole sub 201. In the length direction of the while-drilling magnetic orientation transmitting antenna, the second insulating dipole sub 201 is arranged at both ends of the recovery pole 103, and is used for insulating the transmitting pole 102 and the recovery pole 103.

[0058] Specifically, in the length direction of the while-drilling magnetic orientation transmitting antenna, the second insulating dipole sub 201 is arranged at both ends of the recovery pole 103, and the recovery pole 103 is arranged to be insulated. The recovery pole 103 can be insulated from other tubular columns, so as to avoid the short circuit of the recovery pole 103 through other tubular columns and the transmitting pole 102, thereby enabling the while-drilling magnetic orientation transmitting antenna to effectively form an alternating current loop. The second insulating dipole sub 201 is used to insulate the drill collar subs at both ends of the second insulating dipole sub 201 from each other. The second insulating dipole sub 201 needs to have the characteristics of good electrical insulation, high strength and erosion resistance, and can maintain good insulation characteristics under high temperature and high pressure. The second insulating dipole sub 201 is a key unit for insulating the transmitting pole 102 and the recovery pole 103, and enabling the alternating current to pass from the transmitting pole 102 to the recovery pole 103 through the formation.

[0059] Optionally, on the basis of each of the above embodiments, Figure 6 is a structural schematic diagram of a second insulating dipole sub provided by an embodiment of the present application, as shown in Figure 1 and Figure 6As shown, the second insulated dipole short section 201 comprises a second female double collar joint 215, a second male double collar joint 216, a second insulating coating 218, a second inner insulator 217 and a second outer insulator 219. The second insulating coating 218 is arranged at the threaded connection of the second female double collar joint 215 and the second male double collar joint 216, the second inner insulator 217 is arranged at the inner joint of the second female double collar joint 215 and the second male double collar joint 216, and the second outer insulator 219 is arranged at the outer joint of the second female double collar joint 215 and the second male double collar joint 216.

[0060] Specifically, the forming method of the second insulated dipole short section 201 is to spray the second insulating coating 218 at the threaded connection of the second female double collar joint 215 and the second male double collar joint 216, and to install the second inner insulator 217 at the inner joint of the second female double collar joint 215 and the second male double collar joint 216, and to install the second outer insulator 219 at the outer joint of the second female double collar joint 215 and the second male double collar joint 216. The second inner insulator 217 and the second outer insulator 219 are both made of erosion-resistant insulating materials. The second female double collar joint 215 and the second male double collar joint 216 are rotated and fastened, and attention should be paid to that the second insulating coating 218 should not be damaged during fastening. After fastening, the insulation resistance between the second female double collar joint 215 and the second male double collar joint 216 is greater than 30 MΩ before the second insulated dipole short section 201 can be used.

[0061] Optionally, on the basis of the above-mentioned embodiments, continuing to refer to Figure 1 The while-drilling magnetic orientation transmitting antenna further comprises an isolation short section 104 and an adjusting sheath 108. In the length direction of the while-drilling magnetic orientation transmitting antenna, the adjusting short section 104 is arranged between the transmitting pole 102 and the recovery pole 103, and is used to adjust the distance between the transmitting pole 102 and the recovery pole 103. The adjusting sheath 108 is arranged inside the isolation short section 104, and is used to control the corresponding connection between the transmitting pole elastic conductor 107 and the transmitting pole 102 and the corresponding connection between the recovery pole elastic conductor 109 and the recovery pole 103 according to the length change of the isolation short section 104.

[0062] Specifically, the isolation short 104 is installed between the transmitting electrode 102 and the receiving electrode 103, and the isolation short 104 can be used to adjust the distance between the transmitting electrode 102 and the receiving electrode 103, so that the transmitting antenna of the magnetic navigation while drilling can obtain better transmitting and receiving effects. In order to realize the transmission of the transmitting alternating current S1 from the transmitting electrode 102 to the receiving electrode 103 in space, instead of diffusing along the metal short between the transmitting electrode 102 and the receiving electrode 103, a non-metal insulating layer 110 is arranged on the outer surface of the isolation short 104, and the isolation short 104 constitutes an isolation current. The adjusting sheath 108 is arranged inside the isolation short 104, and when the length of the isolation short 104 changes, the adjusting sheath 108 can adjust the overall length of the compensation instrument, and the length of the adjusting sheath 108 also changes correspondingly, so that the transmitting elastic conductor 107 and the transmitting electrode 102 are correspondingly connected, and the receiving elastic conductor 109 and the receiving electrode 103 are correspondingly connected.

[0063] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, in sequence, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, and the present application is not limited herein.

[0064] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetically guided transmitting antenna for drilling, characterized in that, include: Conductive cables, emitter elastic conductors, emitter, recyclable electrode, recyclable electrode elastic conductor; The conductive cable is connected to the emitter elastic conductor and the recovery elastic conductor. The conductive cable is used to receive the emitter alternating current and the recovery alternating current and transmit them to the emitter elastic conductor and the recovery elastic conductor, respectively. The emitter elastic conductor is connected to the emitter, and the recovery electrode elastic conductor is connected to the recovery electrode. The emitter elastic conductor is used to transmit the emitted alternating current to the emitter, and the recovery electrode elastic conductor is used to transmit the recovered alternating current to the recovery electrode. The emitter transmits the alternating current through the ground to the recovery electrode; The magnetically guided transmitting antenna while drilling further includes: a first insulating dipole short section; along the length of the magnetically guided transmitting antenna while drilling, the first insulating dipole short section is disposed at both ends of the transmitting pole, for insulating the transmitting pole and the recovery pole; The magnetically guided transmitting antenna while drilling further includes: a second insulating dipole short section; along the length of the magnetically guided transmitting antenna while drilling, the second insulating dipole short section is disposed at both ends of the recovery pole, for insulating the transmitting pole and the recovery pole; The transmitting alternating current is emitted into the formation from the transmitting electrode, and a portion of the transmitted alternating current in the formation returns to the recovering electrode to form a closed loop. The drilling magnetic guidance transmitting antenna is integrated with the magnetic guidance measurement tool and drilling tool. The magnetic guidance measurement tool includes a probe section. The alternating current forming the closed loop generates an induced current on the old well casing. The induced current generates an induced magnetic field. After detecting the magnetic field strength, the probe section analyzes the distance between the new well and the old well casing and guides the drilling direction of the new well.

2. The magnetically guided transmitting antenna while drilling according to claim 1, characterized in that, The emitter elastic conductor includes: a first fixed sleeve, a first sliding sleeve, a first bow-shaped spring piece, and a first pressure-resistant shell; the first bow-shaped spring piece is connected to the conductive cable; Along the length of the first pressure-resistant housing, the first fixed sleeve and the first sliding sleeve are spaced apart on the first pressure-resistant housing, and the first bow-shaped spring is connected between the first fixed sleeve and the first sliding sleeve. The first sliding sleeve slides relative to the first pressure-resistant housing, so that the first bow-shaped spring contacts the emitter.

3. The magnetically guided transmitting antenna while drilling according to claim 1, characterized in that, The recyclable electrode elastic conductor includes: a second fixed sleeve, a second sliding sleeve, a second bow-shaped spring piece, and a second pressure-resistant shell; the second bow-shaped spring piece is connected to the conductive cable; Along the length of the second pressure-resistant housing, the second fixed sleeve and the second sliding sleeve are spaced apart on the second pressure-resistant housing. The second bow-shaped spring is connected between the second fixed sleeve and the second sliding sleeve. The second sliding sleeve slides relative to the second pressure-resistant housing, so that the second bow-shaped spring contacts the recovery electrode.

4. The magnetically guided transmitting antenna while drilling according to claim 1, characterized in that, Also includes: First insulating sheath; Along the length of the magnetically guided transmitting antenna during drilling, the first insulating sheath is disposed at both ends of the transmitting electrode elastic conductor to confine the transmitting alternating current within the transmitting electrode elastic conductor.

5. The magnetically guided transmitting antenna while drilling according to claim 1, characterized in that, Also includes: Second insulating sheath; Along the length of the drilling magnetically guided transmitting antenna, the second insulating sheath is disposed at both ends of the recovery electrode elastic conductor to confine the recovery alternating current within the recovery electrode elastic conductor.

6. The magnetically guided transmitting antenna while drilling according to claim 1, characterized in that, The first insulating dipole short section includes: a first double female drill collar joint, a first double male drill collar joint, a first insulating coating, a first inner insulator, and a first outer insulator; The first insulating coating is provided at the threaded connection of the first double female drill collar and the first double male drill collar, the first inner insulator is provided at the inner joint of the first double female drill collar and the first double male drill collar, and the first outer insulator is provided at the outer joint of the first double female drill collar and the first double male drill collar.

7. The magnetically guided transmitting antenna while drilling according to claim 1, characterized in that, The second insulating dipole short section includes: a second double female drill collar joint, a second double male drill collar joint, a second insulating coating, a second inner insulator, and a second outer insulator; The second insulating coating is provided at the threaded connection of the second double female drill collar and the second double male drill collar, the second inner insulator is provided at the inner joint of the second double female drill collar and the second double male drill collar, and the second outer insulator is provided at the outer joint of the second double female drill collar and the second double male drill collar.

8. The magnetically guided transmitting antenna while drilling according to claim 1, characterized in that, Also includes: Isolation section and adjustment sleeve; Along the length of the magnetically guided transmitting antenna during drilling, the isolation section is disposed between the transmitting pole and the recovering pole to adjust the distance between the transmitting pole and the recovering pole; The adjusting sleeve is disposed inside the isolation short section and is used to control the corresponding connection between the emitter elastic conductor and the emitter, and the corresponding connection between the recovery electrode elastic conductor and the recovery electrode according to the change in the length of the isolation short section.

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