While-drilling magnetic steering transmitting antenna

Abstract

The invention discloses a magnetic steering transmitting antenna while drilling. The magnetic steering transmitting antenna while drilling comprises a conductive cable, an emitting electrode elastic conductor, an emitting electrode, a recycling electrode and a recycling electrode elastic conductor, the conductive cable is connected with the emitting electrode elastic conductor and the recycling electrode elastic conductor; the conductive cable is used for receiving the emitting alternating current and the recycling alternating current and respectively transmitting the emitting alternating current and the recycling alternating current to the emitting electrode elastic conductor and the recycling electrode elastic conductor; the emitting electrode elastic conductor is connected with the emitting electrode, the recycling electrode elastic conductor is connected with the recycling electrode, the emitting electrode elastic conductor is used for transmitting the emitting alternating current to the emitting electrode, and the recycling electrode elastic conductor is used for transmitting the recycling alternating current to the recycling electrode; the emitting electrode transmits and emits alternating current to the recycling electrode through the stratum. According to the magnetic steering transmitting antenna while drilling, the efficiency of operation while drilling can be effectively improved, and the cost of operation while drilling can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of measurement while drilling, and in particular to a magnetic guidance transmitting antenna while drilling. Background Art

[0002] Magnetic guidance measurement technology is developed on the basis of traditional logging technology. This technology drills a new well near the old well, measures the positional relationship between the new well and the old well by magnetic induction, adjusts the drilling trajectory of the new well, and finally realizes the new well approaching the old well until it is connected. In the specific construction process, the new well is first directionally 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 supply is started, and the current transmitted by the cable is used to stimulate discharge. When the discharge current propagates in the formation, it will be transmitted to the casing of the old well. The current in the casing will induce a magnetic field to the formation. The detection short section in the magnetic guidance measurement tool can detect and analyze the magnetic field, calculate the distance and direction between the new well and the old well casing, and after determining the positional relationship between the two, the magnetic guidance measurement tool is taken out from the wellbore, and the drilling tool is lowered again to drill in the predetermined direction. This reciprocating process finally realizes the connection between the two wells and achieves the purpose of reusing the old well.

[0003] Since the magnetic guidance measurement tool is lowered into the bottom of the new well by a cable, the current excited by the ground is transmitted to the formation through the cable, and the positional relationship between the new well and the old well is determined by the induced current generated by the loop current on the casing of the old well. The installation of the cable will make it impossible to set the drill string in the drilling tool, and the cable has a low hardness, and it is impossible to apply pressure to the drill bit through the cable, resulting in this type of magnetic guidance measurement tool only having the measurement function but not the drilling ability. Therefore, after the measurement is completed, it needs to be taken out of the wellbore and the drilling tool needs to be replaced for drilling. After drilling a certain distance, the drilling tool needs to be taken out and replaced with the magnetic guidance measurement tool for measurement, and this cycle is repeated, which seriously affects the operation efficiency and increases the drilling cost. Summary of the invention

[0004] The invention provides a magnetic guidance transmitting antenna while drilling, which can be integrated with a conventional magnetic guidance measuring tool and a drilling tool for use, so as to solve the problems of low efficiency and high cost of existing while drilling operations.

[0005] In a first aspect, the present invention provides a magnetic guidance transmitting antenna while drilling, the magnetic guidance transmitting antenna while drilling comprising: a conductive cable, an emitter elastic conductor, an emitter, a recovery electrode, and a recovery electrode elastic conductor;

[0006] The conductive cable is connected to the emitter elastic conductor and the recovery electrode elastic conductor, and the conductive cable is used to receive the emission alternating current and the recovery alternating current and transmit them to the emitter elastic conductor and the recovery electrode elastic conductor respectively;

[0007] The emitter elastic conductor is connected to the emitter, the recovery electrode elastic conductor is connected to the recovery electrode, the emitter elastic conductor is used to transmit the emission alternating current to the emitter, and the recovery electrode elastic conductor is used to transmit the recovery alternating current to the recovery electrode;

[0008] The emitter transmits the alternating current through the ground to the recovery electrode.

[0009] Optionally, 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 a 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 at intervals, the first bow-shaped spring 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 to make the first bow-shaped spring piece contact with the emitter.

[0011] Optionally, the recovery pole 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 a 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 at intervals, the second bow-shaped spring 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 to make the second bow-shaped spring piece contact with the recovery pole.

[0013] Optionally, the magnetic guidance transmitting antenna while drilling further includes: a first insulating sheath;

[0014] In the length direction of the while-drilling magnetic guidance transmitting antenna, the first insulating sheath is arranged at both ends of the emitter elastic conductor, so as to limit the transmitting alternating current in the emitter elastic conductor.

[0015] Optionally, the magnetic guidance transmitting antenna while drilling further includes: a second insulating sheath;

[0016] In the length direction of the while-drilling magnetic guidance transmitting antenna, the second insulating sheath is arranged at both ends of the recovery pole elastic conductor, so as to limit the recovery alternating current in the recovery pole elastic conductor.

[0017] Optionally, the magnetic guidance transmitting antenna while drilling further includes: a first insulating dipole short section;

[0018] In the length direction of the while-drilling magnetic guidance transmitting antenna, the first insulating dipole short section is arranged at both ends of the transmitting pole, and is used for insulating the transmitting pole and the recovery pole.

[0019] Optionally, the first insulating dipole nipple 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] A first insulating coating is provided at the threaded connection between the first double female drill collar joint and the first double male drill collar joint, a first inner insulator is provided at the inner joint between the first double female drill collar joint and the first double male drill collar joint, and a first outer insulator is provided at the outer joint between the first double female drill collar joint and the first double male drill collar joint.

[0021] Optionally, the magnetic guidance transmitting antenna while drilling further includes: a second insulating dipole short section;

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

[0023] Optionally, the second insulating dipole nipple comprises: 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;

[0024] A second insulating coating is provided at the threaded connection between the second double female drill collar joint and the second double male drill collar joint, a second inner insulator is provided at the inner joint between the second double female drill collar joint and the second double male drill collar joint, and a second outer insulator is provided at the outer joint between the second double female drill collar joint and the second double male drill collar joint.

[0025] Optionally, the magnetic guidance transmitting antenna while drilling further includes: an isolation short section and an adjustment sheath;

[0026] In the length direction of the while-drilling magnetic guidance transmitting antenna, an isolation short section is arranged between the transmitting pole and the recovering pole, and is used to adjust the distance between the transmitting pole and the recovering pole;

[0027] The regulating sheath is arranged inside the isolating short section, and is used for controlling the corresponding connection between the emitter elastic conductor and the emitter, and controlling the corresponding connection between the recovery electrode elastic conductor and the recovery electrode according to the change of the length of the isolating short section.

[0028] The technical solution provided by the embodiment of the present invention provides a magnetic guidance transmitting antenna while drilling, which includes a conductive cable, an emitter elastic conductor, an emitter, a recovery electrode and a recovery electrode elastic conductor. The transmitting alternating current is transmitted to the emitter through the conductive cable and the emitter elastic conductor, and the recovery alternating current is transmitted to the recovery electrode through the conductive cable and the recovery electrode elastic conductor. The transmitting alternating current is emitted from the emitter to the formation, and a part of the transmitting alternating current in the formation returns to the recovery electrode to form a closed loop. The magnetic guidance transmitting antenna while drilling provided by the embodiment of the present invention can be integrated with traditional magnetic guidance measurement tools and drilling tools for connection operations between new and old wellbores. The alternating current forming a closed loop generates an induced current on the casing of the old well, and the induced current forms an induced magnetic field. After the detection short section detects the magnetic field strength, the distance between the new well and the old well casing is analyzed, and then the drilling direction of the new well is guided. There is no need to set a cable extending from the bottom of the new well to the ground. While the magnetic guidance measurement tool is measuring, the hardness of the magnetic guidance transmitting antenna while drilling is sufficient. After the magnetic guidance transmitting antenna while drilling and the drill string are connected, they can jointly control the drilling of the drill bit. The measurement and drilling can be performed simultaneously in a new wellbore without frequent drilling. The drilling-while-drilling magnetic guidance transmitting antenna provided by the embodiment of the present invention can effectively improve the efficiency of drilling-while-drilling operations and effectively reduce the cost of drilling-while-drilling operations.

[0029] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of a magnetic guidance transmitting antenna while drilling provided by an embodiment of the present invention;

[0032] Figure 2 It is a structural schematic diagram of an integrated while-drilling magnetic guidance transmitting antenna, a magnetic guidance measuring tool and a drilling tool provided by an embodiment of the present invention;

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

[0034] Figure 4 It is a schematic structural diagram of a recycling pole elastic conductor provided by an embodiment of the present invention;

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

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

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0040] Specifically, the conductive cable can be arranged at the center inside the magnetic guidance transmitting antenna while drilling as the center lead. Exemplarily, the conductive cable can be a wire with an insulating skin. One end of the magnetic guidance transmitting antenna while drilling can be connected to a power generation short section, and a generator is arranged inside the power generation short section. The generator can generate a transmitting alternating current S1 and a recovering alternating current S2. The connector 105 flows through the transmitting alternating current S1 and the recovering alternating current S2 drawn from the generator. The transmitting alternating current S1 is conducted to the emitter 102 through the conductive cable and the emitter elastic conductor 107, and the recovering alternating current S2 is transmitted to the recovering pole 103 through the conductive cable and the recovering pole elastic conductor 109. The transmitting alternating current S1 is emitted into the formation by the emitter 102, and a part of the transmitting alternating current S1 in the formation returns to the recovering pole 103 to form a closed loop.

[0041] The function of the emitter elastic conductor 107 and the recovery electrode elastic conductor 109 is to enable the transmitting alternating current S1 and the recovery alternating current S2 to form a closed loop in the while-drilling magnetic guidance transmitting antenna. The specific path is transmitting alternating current S1-emitter elastic conductor 107-emitter 102-earth-recovery electrode 103-recovery electrode elastic conductor 109-recovery alternating current S2.

[0042] Figure 2 FIG. 1 is a schematic diagram of a structure of a magnetic guidance transmitting antenna while drilling, a magnetic guidance measuring tool and a drilling tool integrated with each other provided by an embodiment of the present invention. Figure 1 and Figure 2 As shown, one end of the magnetic guidance transmitting antenna 1 while drilling is connected to the drill string 2, and the other end is connected to the generating short section 5. The generating short section 5 is equipped with a turbine generator. During the drilling operation, the mud circulates, and the generator generates a transmitting alternating current S1 and a recovering alternating current S2. The transmitting alternating current S1 is transmitted to the emitter 102 through the conductive cable and the emitter elastic conductor 107, and the recovering alternating current S2 is transmitted to the recovering pole 103 through the conductive cable and the recovering pole elastic conductor 109. The transmitting alternating current S1 is emitted from the emitter 102 to the formation, and a part of the transmitting alternating current S1 in the formation returns to the recovering pole 103 to form a closed loop. The alternating current 10 that does not form a closed loop spreads to the earth and is attenuated. The alternating current 9 that forms a closed loop generates an induced current 12 on the old well casing 11, and the induced current 12 forms an induced magnetic field 13. After the detection short section 6 detects the magnetic field strength, it 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 4 is a drilling platform, 7 is a screw, and 8 is a drill bit.

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

[0044] The technical solution of the embodiment of the present invention provides a magnetic guidance transmitting antenna while drilling, which includes a conductive cable, an emitter elastic conductor, an emitter, a recovery electrode and a recovery electrode elastic conductor. The transmitting alternating current is transmitted to the emitter through the conductive cable and the emitter elastic conductor, and the recovery alternating current is transmitted to the recovery electrode through the conductive cable and the recovery electrode elastic conductor. The transmitting alternating current is emitted from the emitter to the formation, and a part of the transmitting alternating current in the formation returns to the recovery electrode to form a closed loop. The magnetic guidance transmitting antenna while drilling provided by the embodiment of the present invention can be integrated with traditional magnetic guidance measurement tools and drilling tools for connection operations between new and old wellbores. The alternating current forming a closed loop generates an induced current on the casing of the old well, and the induced current forms an induced magnetic field. After the detection short section detects the magnetic field strength, the distance between the new well and the old well casing is analyzed, and then the drilling direction of the new well is guided. There is no need to set a cable extending from the bottom of the new well to the ground. While the magnetic guidance measurement tool is measuring, the hardness of the magnetic guidance transmitting antenna while drilling is sufficient. After the magnetic guidance transmitting antenna while drilling and the drill string are connected, they can jointly control the drilling of the drill bit. The measurement and drilling can be performed simultaneously in a new wellbore without frequent drilling. The drilling-while-drilling magnetic guidance transmitting antenna provided by the embodiment of the present invention can effectively improve the efficiency of drilling-while-drilling operations and effectively reduce the cost of drilling-while-drilling operations.

[0045] Optionally, based on the above embodiments, Figure 3 is a schematic diagram of the structure of an emitter elastic conductor provided by an embodiment of the present invention, such as Figure 1 and Figure 3 As shown, the emitter elastic conductor 107 includes: a first fixed sleeve 111, a first sliding sleeve 112, a first bow-shaped spring piece 113 and a first pressure-resistant housing 114. The first bow-shaped spring piece 113 is connected to the conductive cable. In the length direction of the first pressure-resistant housing 114, the first fixed sleeve 111 and the first sliding sleeve 112 are arranged on the first pressure-resistant housing 114 at intervals, the first bow-shaped spring piece 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 pressure-resistant housing 114, so that the first bow-shaped spring piece 113 contacts the emitter 102.

[0046] Specifically, the first fixed sleeve 111 is fixedly sleeved on the first pressure-resistant shell 114, the first sliding sleeve 112 is also sleeved on the first pressure-resistant shell 114, the first bow-shaped spring piece 113 is connected between the first fixed sleeve 111 and the first sliding sleeve 112, the first sliding sleeve 112 can slide on the first pressure-resistant shell 114, thereby changing the curvature of the first bow-shaped spring piece 113, and utilizing the compressive reverse force of the first bow-shaped spring piece 113 to make the first bow-shaped spring piece 113 fit tightly with the inner wall of the emitter 102, thereby realizing the conduction of the emitted alternating current S1 to the emitter 102.

[0047] Optionally, based on the above embodiments, Figure 4 is a schematic diagram of the structure of a recycling pole elastic conductor provided by an embodiment of the present invention, such as Figure 1 and Figure 4 As shown, the recovery pole elastic conductor 109 includes: a second fixed sleeve 211, a second sliding sleeve 212, a second bow-shaped spring piece 213 and a second pressure-resistant shell 214. The second bow-shaped spring piece 213 is connected to the conductive cable. In the length direction of the second pressure-resistant shell 214, the second fixed sleeve 211 and the second sliding sleeve 212 are arranged on the second pressure-resistant shell 214 at intervals, the second bow-shaped spring piece 213 is connected between the second fixed sleeve 211 and the second sliding sleeve 212, and the second sliding sleeve 212 slides relative to the second pressure-resistant shell 214, so that the second bow-shaped spring piece 213 contacts the recovery pole 103.

[0048] Specifically, the second fixed sleeve 211 is fixedly sleeved on the second pressure-resistant shell 214, the second sliding sleeve 212 is also sleeved on the second pressure-resistant shell 214, the second bow-shaped spring 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 pressure-resistant shell 214, thereby changing the curvature of the second bow-shaped spring piece 213, and utilizing the compressive reverse force of the second bow-shaped spring piece 213 to make the second bow-shaped spring piece 213 fit tightly with the inner wall of the recovery pole 103, thereby realizing the conduction of the recovered alternating current S2 to the recovery pole 103.

[0049] Optionally, based on the above embodiments, continue to refer to Figure 1 The magnetic guidance transmitting antenna while drilling further includes a first insulating sheath 106 . In the length direction of the magnetic guidance transmitting antenna while drilling, the first insulating sheath 106 is arranged at both ends of the emitter elastic conductor 107 to limit the transmitting alternating current S1 in the emitter elastic conductor 107 .

[0050] Specifically, a first insulating sheath 106 is provided at both ends of the emitter elastic conductor 107, which can effectively prevent the transmission of the emitted alternating current S1 to the recovery electrode elastic conductor 109 and the recovery electrode 103 through other pipe columns, and prevent the emitter 102 and the recovery electrode 103 from short-circuiting, so that the while-drilling magnetic guidance transmitting antenna can effectively form an AC circuit.

[0051] Optionally, based on the above embodiments, continue to refer to Figure 1 The magnetic guidance transmitting antenna while drilling further includes a second insulating sheath 206. The second insulating sheath 206 is disposed at both ends of the recovery pole elastic conductor 109 along the length direction of the magnetic guidance transmitting antenna while drilling, and is used to limit the recovery alternating current S2 in the recovery pole elastic conductor 109.

[0052] Specifically, a second insulating sheath 206 is provided at both ends of the recovery electrode elastic conductor 109, which can effectively prevent the recovery alternating current S2 from being transmitted to the emitter elastic conductor 107 and the emitter 102 through other pipe columns, and prevent the emitter 102 and the recovery electrode 103 from being short-circuited, so that the while-drilling magnetic guidance transmitting antenna can effectively form an AC circuit.

[0053] Optionally, based on the above embodiments, continue to refer to Figure 1 The magnetic guidance transmitting antenna while drilling further includes: a first insulating dipole short section 101. In the length direction of the magnetic guidance transmitting antenna while drilling, the first insulating dipole short section 101 is arranged at both ends of the transmitting pole 102, and is used to insulate the transmitting pole 102 and the recovery pole 103.

[0054] Specifically, in the length direction of the magnetic guidance transmitting antenna while drilling, the first insulating dipole short section 101 is set at both ends of the emitter 102. The emitter 102 is separately insulated, which can insulate the emitter 102 from other pipes, and prevent the emitter 102 from short-circuiting with the recovery pole 103 through other pipes, so that the magnetic guidance transmitting antenna while drilling can effectively form an AC circuit. The function of the first insulating dipole short section 101 is to insulate the drill collar short sections at both ends from each other. The first insulating dipole short section 101 needs to have good electrical insulation performance, high strength and erosion resistance, and can maintain good insulation properties under high temperature and high pressure. The first insulating dipole short section 101 is a key unit that insulates the emitter 102 and the recovery pole 103, and realizes the alternating current from the emitter 102 to the recovery pole 103 through the formation.

[0055] Optionally, based on the above embodiments, Figure 5 is a schematic diagram of the structure of a first insulating dipole short section provided by an embodiment of the present invention, such as Figure 1 and Figure 5 As shown, the first insulating dipole nipple 101 includes: 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 provided at the threaded connection between the first double female drill collar joint 115 and the first double male drill collar joint 116, the first inner insulator 117 is provided at the inner 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 provided at the outer joint of the first double female drill collar joint 115 and the first double male drill collar joint 116.

[0056] Specifically, the first insulating dipole short section 101 is formed by spraying a 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, and at the same time installing a 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 installing a 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, and the first double female drill collar joint 115 and the first double male drill collar joint 116 are rotated and tightened. When tightening, it is noted that the first insulating coating 118 cannot be damaged. After the tightening is completed, the insulation resistance between the first double female drill collar joint 115 and the first double male drill collar joint 116 is measured to be greater than 30MΩ before use.

[0057] Optionally, based on the above embodiments, continue to refer to Figure 1 The magnetic guidance transmitting antenna while drilling further includes: a second insulating dipole short section 201. In the length direction of the magnetic guidance transmitting antenna while drilling, the second insulating dipole short section 201 is arranged at both ends of the recovery pole 103 to insulate the transmitting pole 102 and the recovery pole 103.

[0058] Specifically, in the length direction of the magnetic guidance transmitting antenna while drilling, the two ends of the recovery pole 103 are provided with second insulating dipole short sections 201. The recovery pole 103 is separately insulated, so that the recovery pole 103 can be insulated from other pipes, and the recovery pole 103 is prevented from being short-circuited with the emitter 102 through other pipes, so that the magnetic guidance transmitting antenna while drilling can effectively form an AC circuit. The function of the second insulating dipole short section 201 is to insulate the drill collar short sections at both ends from each other. The second insulating dipole short section 201 needs to have good electrical insulation performance, high strength and erosion resistance, and can maintain good insulation properties under high temperature and high pressure. The second insulating dipole short section 201 is a key unit that enables the emitter 102 and the recovery pole 103 to be insulated, and realizes the alternating current from the emitter 102 through the formation to the recovery pole 103.

[0059] Optionally, based on the above embodiments, Figure 6 is a schematic diagram of the structure of a second insulating dipole short section provided by an embodiment of the present invention, such as Figure 1 and Figure 6As shown, the second insulating dipole sub 201 includes: a second double female drill collar joint 215, a second double male drill 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 provided at the threaded connection of the second double female drill collar joint 215 and the second double male drill collar joint 216, the second inner insulator 217 is provided at the inner joint of the second double female drill collar joint 215 and the second double male drill collar joint 216, and the second outer insulator 219 is provided at the outer joint of the second double female drill collar joint 215 and the second double male drill collar joint 216.

[0060] Specifically, the second insulating dipole short section 201 is formed by spraying a second insulating coating 218 at the threaded connection of the second double female drill collar joint 215 and the second double male drill collar joint 216, and at the same time installing a second inner insulator 217 at the inner joint of the second double female drill collar joint 215 and the second double male drill collar joint 216, and installing a second outer insulator 219 at the outer reserved position. The second inner insulator 217 and the second outer insulator 219 are both made of erosion-resistant insulating materials, and the second double female drill collar joint 215 and the second double male drill collar joint 216 are rotated and tightened. When tightening, it is noted that the second insulating coating 218 cannot be damaged. After the tightening is completed, the insulation resistance between the second double female drill collar joint 215 and the second double male drill collar joint 216 is measured to be greater than 30MΩ before use.

[0061] Optionally, based on the above embodiments, continue to refer to Figure 1 The magnetic guidance transmitting antenna while drilling also includes: an isolation short section 104 and an adjustment sheath 108. In the length direction of the magnetic guidance transmitting antenna while drilling, the adjustment short section 104 is arranged between the emitter 102 and the recovery pole 103, and is used to adjust the distance between the emitter 102 and the recovery pole 103. The adjustment sheath 108 is arranged inside the isolation short section 104, and is used to control the corresponding connection between the emitter elastic conductor 107 and the emitter 102, and control 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, an isolation short section 104 is installed between the emitter 102 and the recovery pole 103. The isolation short section 104 can be used to adjust the distance between the emitter 102 and the recovery pole 103, so that the magnetic guidance transmitting antenna while drilling can obtain better transmission and recovery effects. In order to achieve the transmission of the transmitted alternating current S1 from the emitter 102 to the recovery pole 103 in space, rather than diffusing along the metal short section between the emitter 102 and the recovery pole 103, a non-metallic insulating layer 110 is provided on the outer surface of the isolation short section 104 to form an isolation short section 104 that isolates the current. The adjustment sheath 108 is arranged inside the isolation short section 104. When the length of the isolation short section 104 changes, the adjustment sheath 108 can adjust the overall length of the compensation instrument, and the length of the adjustment sheath 108 also changes accordingly, so that the emitter elastic conductor 107 and the emitter 102 are connected correspondingly, and the recovery pole elastic conductor 109 and the recovery pole 103 are connected correspondingly.

[0063] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0064] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic guidance transmitting antenna while drilling, characterized in that: include: Conductive cable, emitter elastic conductor, emitter, recovery electrode, recovery electrode elastic conductor; The conductive cable is connected to the emitter elastic conductor and the recovery electrode elastic conductor, and the conductive cable is used to receive the emission alternating current and the recovery alternating current and transmit them to the emitter elastic conductor and the recovery electrode elastic conductor respectively; The emitter elastic conductor is connected to the emitter, the recovery electrode elastic conductor is connected to the recovery electrode, the emitter elastic conductor is used to transmit the emission alternating current to the emitter, and the recovery electrode elastic conductor is used to transmit the recovery alternating current to the recovery electrode; The emitter electrode transmits the emission alternating current to the recovery electrode through the stratum.

2. The magnetic guidance transmitting antenna while drilling according to claim 1, characterized in that: The emitter elastic conductor comprises: 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; 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 at intervals, the first bow-shaped spring 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 to make the first bow-shaped spring piece contact with the emitter.

3. The magnetic guidance transmitting antenna while drilling according to claim 1, characterized in that: The recovery pole elastic conductor comprises: 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; In the length direction of the second pressure-resistant shell, the second fixed sleeve and the second sliding sleeve are arranged at intervals on the second pressure-resistant shell, the second bow-shaped spring 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 bow-shaped spring piece contacts the recovery pole.

4. The magnetic guidance transmitting antenna while drilling according to claim 1, characterized in that: Also includes: a first insulating sheath; In the length direction of the while-drilling magnetic guidance transmitting antenna, the first insulating sheath is arranged at both ends of the emitter elastic conductor, so as to limit the transmitting alternating current in the emitter elastic conductor.

5. The magnetic guidance transmitting antenna while drilling according to claim 1, characterized in that: Also includes: A second insulating sheath; In the length direction of the while-drilling magnetic guidance transmitting antenna, the second insulating sheath is arranged at both ends of the recovery pole elastic conductor, so as to limit the recovery alternating current in the recovery pole elastic conductor.

6. The magnetic guidance transmitting antenna while drilling according to claim 1, characterized in that: Also includes: A first insulating dipole nipple; In the length direction of the magnetic guidance transmitting antenna while drilling, the first insulating dipole short section is arranged at both ends of the transmitting pole, and is used to insulate the transmitting pole and the recovery pole.

7. The magnetic guidance transmitting antenna while drilling according to claim 6, characterized in that: The first insulating dipole nipple 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; The first insulating coating is provided at the threaded connection between the first double female drill collar joint and the first double male drill collar joint, a first inner insulator is provided at the inner joint between the first double female drill collar joint and the first double male drill collar joint, and a first outer insulator is provided at the outer joint between the first double female drill collar joint and the first double male drill collar joint.

8. The magnetic guidance transmitting antenna while drilling according to claim 1, characterized in that: Also includes: A second insulating dipole nipple; In the length direction of the while-drilling magnetic guidance transmitting antenna, the second insulating dipole short section is arranged at both ends of the recovery pole, and is used to insulate the transmitting pole and the recovery pole.

9. The magnetic guidance transmitting antenna while drilling according to claim 8, characterized in that: The second insulating dipole nipple comprises: 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 between the second double female drill collar joint and the second double male drill collar joint, a second inner insulator is provided at the inner joint between the second double female drill collar joint and the second double male drill collar joint, and a second outer insulator is provided at the outer joint between the second double female drill collar joint and the second double male drill collar joint.

10. The magnetic guidance transmitting antenna while drilling according to claim 1, characterized in that: Also includes: Isolation nipples and adjustment sleeves; In the length direction of the magnetic guidance transmitting antenna while drilling, the isolation short section is arranged between the transmitting pole and the recovery pole, and is used to adjust the distance between the transmitting pole and the recovery pole; The regulating sheath is arranged inside the isolating short section, and is used for controlling the corresponding connection between the emitter elastic conductor and the emitter, and controlling the corresponding connection between the recovery electrode elastic conductor and the recovery electrode according to the length change of the isolating short section.

Images