Interface short section and drilling and directional tool string

Abstract

The present invention relates to an interface sub and a drilling and directional instrument string, wherein the interface sub comprises a primary drill collar and a secondary drill collar fixedly connected to the lower part of the primary drill collar, an inner tube is fixedly arranged in the central flow channel of the primary drill collar, and an outer tube is fixedly arranged in the central flow channel of the secondary drill collar; a first connection joint is fixedly connected to the upper end of the inner tube, two first connection pins are fixedly connected to the lower end of the inner tube, the first connection joint is connected to the two first connection pins, and a wireless transmitting unit is connected between the two first connection pins; two second connection pins are fixedly connected to the upper end of the outer tube, a second connection joint is fixedly connected to the lower end of the outer tube, the second connection joint is connected to the two second connection pins, a wireless receiving unit is connected between the two second connection pins, and the wireless transmitting unit and the wireless receiving unit are connected by electromagnetic coupling. The interface sub of the present invention can greatly reduce the time of wellhead instrument connection and can greatly reduce the complexity of instrument connection.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling and directional drilling instruments, and in particular relates to an interface nipple and a drilling and directional drilling instrument string. Background Art

[0002] The connection of the while-drilling and directional instrument string takes much longer than that of the ordinary tool string. This is mainly because the interfaces of the while-drilling and directional instruments currently used have very high requirements on the connection size and sealing. Once there are quality problems or operational errors, it may lead to problems such as sealing failure, structural failure, power supply failure, communication failure, etc. in the well, thus causing damage to the drill and the instrument, and may even cause greater losses.

[0003] Considering that the drill collar of the instrument often needs to be repaired after use, the connection between the instruments needs to be convenient and adjustable. Another interface short section in the prior art adopts the method of embedding a connecting slip ring on the end face of the drill collar, and the slip ring connection is completed at the same time when the drill collars are docked; this connection method must change the drill collar buckle type to complete the embedding and sealing of the slip ring, which will lead to a series of problems such as non-standard drill collar buckle type and high cost of later repair, and has the disadvantage of complex on-site operation. In addition, the existing connection solutions are all wired solutions, and there is a problem of needing to adjust the size between the male and female connectors when docking at the wellhead. Summary of the invention

[0004] In order to solve all or part of the above problems, the purpose of the present invention is to provide an interface short section and a drilling and directional instrument string. The interface short section of the present invention does not require hard connection and adapter compression, which can greatly reduce the complexity of instrument connection; and the interface short section of the present invention can be easily repaired.

[0005] According to one aspect of the present invention, there is provided an interface nipple, comprising a primary drill collar and a secondary drill collar fixedly connected to the lower portion of the primary drill collar, wherein an inner cylinder is fixedly disposed in a central flow passage of the primary drill collar, and an outer cylinder is fixedly disposed in a central flow passage of the secondary drill collar;

[0006] The upper end of the inner tube is fixedly connected with a first connection joint, the lower end of the inner tube is fixedly connected with two first connection pins, the first connection joint is respectively connected with the two first connection pins, and a wireless transmitting unit is connected between the two first connection pins;

[0007] The upper end of the outer tube is fixedly connected with two second connection pins, the lower end of the outer tube is fixedly connected with a second connection joint, the second connection joint is respectively connected with the two second connection pins, and a wireless receiving unit is connected between the two second connection pins;

[0008] The wireless transmitting unit and the wireless receiving unit are connected via electromagnetic coupling.

[0009] Furthermore, a first support seat is fixedly connected to the central flow channel of the primary drill shank, a first mounting hole is opened in the middle of the first support seat, and the inner tube is fixed in the first mounting hole; a plurality of first through holes connected to the central flow channel of the primary drill shank are opened on the first support seat; the primary drill shank and the secondary drill shank are threadedly connected, and a first gasket is arranged between the primary drill shank and the secondary drill shank.

[0010] Further, the wireless transmitting unit includes a primary coil and a primary magnetic core, both of which are arranged on the inner cylinder, two ends of the primary coil are electrically connected to corresponding first connecting pins respectively, and the primary coil is sleeved on the primary magnetic core;

[0011] The wireless receiving unit comprises a secondary coil and a secondary magnetic core arranged on the outer cylinder, two ends of the secondary coil are electrically connected to corresponding second connecting pins respectively, and the secondary coil is sleeved on the secondary magnetic core;

[0012] The wireless transmitting unit formed by the primary coil and the primary magnetic core is connected with the wireless receiving unit formed by the secondary coil and the secondary magnetic core through electromagnetic coupling.

[0013] Furthermore, the outer cylinder includes an outer cylinder body and a connecting rod, a second gasket is arranged between the inner cylinder and the outer cylinder body, the outer cylinder body and the connecting rod are fixedly connected, and the connecting rod is fixedly connected to the secondary drill collar; two second connecting pins are both arranged at the upper end of the outer cylinder body, and the second connecting joint is arranged at the lower end of the connecting rod.

[0014] Furthermore, the central flow channel of the secondary drill shank is internally threadedly connected to a second support seat, a second mounting hole is provided in the middle of the second support seat, and the connecting rod is threadedly connected to the second mounting hole; the second support seat is provided with a plurality of second through holes connected to the central flow channel of the secondary drill shank.

[0015] Furthermore, the first connecting pin and / or the second connecting pin is a male pin, the lower end of the inner cylinder extends into the outer cylinder body, and sealing rings are provided between the second gasket and the inner cylinder and between the inner cylinder and the outer cylinder body; a first convex ring is provided on the outer side of the inner cylinder, and the second gasket is sleeved on the inner cylinder between the first convex ring and the outer cylinder body.

[0016] Furthermore, the connecting rod is threadedly connected to the outer cylinder body, and a third gasket is arranged between the connecting rod and the outer cylinder body; the outer cylinder body extends into the connecting rod, and a sealing ring is arranged between the outer cylinder body and the connecting rod; a second convex ring is arranged on the outer side of the outer cylinder body, and the third gasket is sleeved on the outer cylinder body between the second convex ring and the connecting rod.

[0017] Further, a first circuit board is sealed on the primary drill collar, the first circuit board is arranged between the first connection joint and one of the first connection pins, the first circuit board is used to divide the received signal into a direct current signal and a communication signal, convert the direct current signal into an alternating current signal, and add the converted alternating current signal and communication signal to the wireless transmitting unit;

[0018] A second circuit board is sealed on the secondary drill collar, and the second circuit board is arranged between the second connecting joint and one of the second connecting pins. The second circuit board is used for receiving the AC signal and the communication signal transmitted by the second connecting pin, converting the AC signal into a DC signal, and transmitting the converted DC signal and communication signal to the second connecting joint.

[0019] Furthermore, the first circuit board includes a receiving board, which is connected to the first connecting connector, and is used to receive communication signals and electrical signals on the first connecting connector, and separate the communication signals and electrical signals; the receiving board is connected to a primary communication board and an inverter board, and the primary communication board is used to receive corresponding communication signals, and the inverter board is used to invert the DC signal received by the receiving board into an AC signal, and the primary communication board and the inverter board are both connected to the first connecting pin.

[0020] Furthermore, the second circuit board includes a secondary communication board and a rectifier and voltage regulator board, and the secondary communication board and the rectifier and voltage regulator board are both connected to the second connecting pins, and the rectifier and voltage regulator board is used to convert the AC signal received by the corresponding second connecting pin into a DC signal. The secondary communication board and the rectifier and voltage regulator board are both connected to a transmission board, and the transmission board is connected to the second connecting connector, and the transmission board is also used to integrate the communication signal and the electrical signal and send them to the second connecting connector.

[0021] Further, the inverter board is electrically connected to the first connection pin via a primary tuning board, and the primary tuning board is used to compensate for the AC signal output by the inverter board;

[0022] The inverter board is connected to a control board, and the inverter board is used to invert the DC signal received by the receiving board into an AC signal under the control signal of the control board; a first power module is arranged on the control board, and the first power module is connected to the primary communication board;

[0023] The rectifier and voltage regulator board includes a rectifier board and a voltage regulator board, the rectifier board is electrically connected to the second connection pin, the rectifier board is used to convert the AC signal received by the second connection pin into a DC signal, and the voltage regulator board is used to perform voltage stabilization processing on the DC signal; a second power supply module is arranged on the voltage regulator board, and the second power supply module is connected to the secondary communication board;

[0024] A secondary harmonic board is further provided between the rectifier board and the second connecting pin, and the secondary harmonic board is used to compensate for the alternating current signal received by the second connecting pin.

[0025] The present invention also provides a while-drilling and directional drilling instrument string, comprising any one of the above described interface short sections.

[0026] It can be seen from the above technical solution that the interface nipple and the drilling and directional instrument string provided by the present invention have the following beneficial effects:

[0027] The interface nipple of the present invention does not need to calculate the compression amount of the hard connection and the adapter head when docking at the wellhead, which can greatly reduce the wellhead instrument connection time and the complexity of instrument connection;

[0028] The interface nipple of the present invention can be adapted to repair the thread. When the primary drill collar and / or the secondary drill collar are repaired, only the thread thread needs to be repaired, and other parts do not need to be repaired according to the length of the repair thread. After the repair, the length of the first gasket, the length of the second gasket or the length of the third gasket can be adjusted accordingly.

[0029] The interface nipple of the present invention makes the operation of connecting the while-drilling and directional instrument strings close to the common downhole drill collar connection, thus saving wellhead time and improving the reliability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A cross-sectional view of an interface nipple according to an embodiment of the present invention;

[0031] Figure 2 The schematic diagram of the circuit of the first circuit board and the second circuit board of the embodiment of the present invention;

[0032] The reference numerals in the figure are: primary drill collar 1, secondary drill collar 2, inner tube 3, outer tube 4, outer tube body 41, connecting rod 42, first support seat 5, first through hole 51, second support seat 6, first connecting pin 7, second connecting pin 8, first gasket 9, second gasket 10, third gasket 11. DETAILED DESCRIPTION

[0033] In order to better understand the purpose, structure and function of the present invention, an interface short section and a drilling and directional instrument string of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, it shows an interface short section of an embodiment of the present invention, including a primary drill collar 1 and a secondary drill collar 2 fixedly connected to the lower part of the primary drill collar 1, an inner cylinder 3 is fixedly arranged in the central flow channel of the primary drill collar 1, and an outer cylinder 4 is fixedly arranged in the central flow channel of the secondary drill collar 2; the upper end of the inner cylinder 3 is fixedly connected with a first connecting joint, the lower end of the inner cylinder 3 is fixedly connected with two first connecting pins 7, the first connecting joints are respectively connected to the two first connecting pins 7, and a wireless transmitting unit is connected between the two first connecting pins 7; the upper end of the outer cylinder 4 is fixedly connected with two second connecting pins 8, the lower end of the outer cylinder 4 is fixedly connected with a second connecting joint, the second connecting joints are respectively connected to the two second connecting pins 8, a wireless receiving unit is connected between the two second connecting pins 8, and the wireless transmitting unit and the wireless receiving unit are connected through electromagnetic coupling.

[0035] Specifically, the interface sub includes a primary drill collar 1 and a secondary drill collar 2. The upper end of the primary drill collar 1 is used to be fixedly connected to the pipe column above it, the lower end of the primary drill collar 1 is fixedly connected to the upper end of the secondary drill collar 2, and the lower end of the secondary drill collar 2 is used to be fixedly connected to the pipe column below it. The fixed connection is achieved by, for example, threaded connection between a male buckle and a female buckle. Figure 1 The primary drill collar 1 is a double female drill collar with female buckles at both ends, and the secondary drill collar 2 is a drill collar with a male buckle at the upper end and a female buckle at the lower end; in specific applications, the secondary drill collar 2 can also be a double male drill collar; the primary drill collar 1 can also be a drill collar with a male buckle at the upper end and a female buckle at the lower end.

[0036] Secondly, an inner cylinder 3 is fixedly arranged in the central flow channel of the primary drill collar 1, and a first connection joint is fixedly connected to the upper end of the inner cylinder 3. The first connection joint is used to connect with the electrical connection part above to receive electrical signals and communication signals. Two first connection pins 7 are fixedly connected to the lower end of the inner cylinder 3. The first connection joint is also used to connect with the two first connection pins 7. A wireless transmitting unit is connected between the two first connection pins 7. Through this arrangement, the first connection joint, the two first connection pins 7 and the wireless transmitting unit form a closed loop.

[0037] Again, an outer cylinder 4 is fixedly arranged in the central flow channel of the secondary drill collar 2, and two second connection pins 8 are fixedly connected to the upper end of the outer cylinder 4, and a second connection joint is fixedly connected to the lower end of the outer cylinder 4. The second connection joint is used to electrically connect with the two second connection pins 8 above to receive electrical signals and communication signals, and the second connection joint is also used to connect with the electrical connection part of the lower pipe column. A wireless receiving unit is connected between the two second connection pins 8. Through this arrangement, the second connection joint, the two second connection pins 8 and the wireless receiving unit form a closed loop.

[0038] The wireless transmitting unit and the wireless receiving unit are connected by electromagnetic coupling. Specifically, for various signals, such as electrical signals and / or communication signals, after the first connection joint receives the signal of the pipe column above it, it is transmitted to the wireless receiving unit on the outer tube 4 through the first connection pin 7 at the lower end and the wireless transmitting unit, and the wireless receiving unit transmits the received signal to the pipe column below through the second connection pin 8 and the second connection joint.

[0039] For this embodiment, during the specific installation, firstly, the inner cylinder 3 is fixedly connected to the primary drill collar 1, the outer cylinder 4 is fixedly connected to the secondary drill collar 2, and then the primary drill collar 1 and the secondary drill collar 2 are fixedly connected. After the primary drill collar 1 and the secondary drill collar 2 are fixedly connected, the inner cylinder 3 and the outer cylinder 4 are connected through electromagnetic coupling.

[0040] The interface short section of this embodiment does not need to calculate the compression amount of the hard connection and the adapter head when docking at the wellhead, which can greatly reduce the wellhead instrument connection time and the complexity of the instrument connection. At the same time, it can be adapted to the repair buckle, so that the connection operation between the drilling and directional instrument strings is close to the ordinary downhole drill collar connection, which saves wellhead time and improves the reliability of the connection.

[0041] In one embodiment, a first support seat 5 is fixedly connected to the central flow channel of the primary drill collar 1, a first mounting hole is opened in the middle of the first support seat 5, and the inner tube 3 is fixed in the first mounting hole; a plurality of first through holes 51 connected to the central flow channel of the primary drill collar 1 are opened on the first support seat 5; the primary drill collar 1 and the secondary drill collar 2 are threadedly connected, and a first gasket 9 is arranged between the primary drill collar 1 and the secondary drill collar 2.

[0042] Specifically, the inner tube 3 is fixed in the central flow channel of the primary drill collar 1 through the first support seat 5. In a specific implementation, for example, the first support seat 5 and the primary drill collar 1, and the first support seat 5 and the inner tube 3 are all threadedly connected. Among them, the first support seat 5 is provided with a plurality of first through holes 51, and the first through holes 51 are used to connect the central flow channel above it and the central flow channel below it.

[0043] The first gasket 9 of this embodiment is used to make the length between the primary drill collar 1 and the secondary drill collar 2 adjustable, so as to adapt to the distance requirement of the electromagnetic coupling between the inner tube 3 and the outer tube 4, that is, by changing the length of the first gasket 9, the length between the primary drill collar 1 and the secondary drill collar 2 can be changed, so that after the primary drill collar 1 is connected to the secondary drill collar 2, the transmission distance requirement of the electromagnetic coupling between the inner tube 3 and the outer tube 4 is met; and the setting of the first gasket 9 can also ensure the compression amount between the female buckle of the primary drill collar and the male buckle of the secondary drill collar.

[0044] In one embodiment, the wireless transmitting unit includes a primary coil and a primary magnetic core, both of which are arranged on the inner cylinder 3, and the two ends of the primary coil are electrically connected to the corresponding first connecting pins 7, and the primary coil is sleeved on the primary magnetic core; the wireless receiving unit includes a secondary coil and a secondary magnetic core arranged on the outer cylinder 4, and the two ends of the secondary coil are electrically connected to the corresponding second connecting pins 8, and the secondary coil is sleeved on the secondary magnetic core; the wireless transmitting unit formed by the primary coil and the primary magnetic core is connected to the wireless receiving unit formed by the secondary coil and the secondary magnetic core through electromagnetic coupling.

[0045] Specifically, the wireless transmitting unit of this embodiment includes a primary coil and a primary magnetic core, and the wireless receiving unit includes a secondary coil and a secondary magnetic core. The primary coil is wound on the primary magnetic core, and the two ends of the primary coil are respectively connected to a first connecting pin 7; the secondary coil is wound on the secondary magnetic core, and the two ends of the secondary coil are respectively connected to a second connecting pin 8.

[0046] Regarding the transmission of communication signals and electrical signals: after the first connecting joint of the inner tube 3 receives the signal from the pipe column above it, the primary coil sends a signal to the outside through the closed loop of the first connecting joint, the two first connecting pins 7 and the primary coil. After receiving the signal, the secondary coil converts the signal into an electrical signal, which is transmitted to the second connecting joint through the loop of the second connecting joint, the two second connecting pins 8 and the secondary coil, and then transmitted to the pipe column below through the second connecting joint.

[0047] In one embodiment, the outer cylinder 4 includes an outer cylinder body 41 and a connecting rod 42, a second gasket 10 is arranged between the inner cylinder 3 and the outer cylinder body 41, the outer cylinder body 41 and the connecting rod 42 are fixedly connected, and the connecting rod 42 is fixedly connected to the secondary drill collar 2; two second connecting pins 8 are both arranged at the upper end of the outer cylinder body 41, and the second connecting joint is arranged at the lower end of the connecting rod 42.

[0048] In this embodiment, the second gasket 10 is arranged between the inner cylinder 3 and the outer cylinder body 41. The length of the second gasket 10 can be selected as needed, so that the distance between the inner cylinder 3 and the outer cylinder body 41 can be adjusted. On the one hand, it can meet the distance requirements of electromagnetic coupling, and on the other hand, it can facilitate later repairs.

[0049] Again, regarding the fixed connection between the connecting rod 42 and the secondary drill collar 2: the central flow channel of the secondary drill collar 2 is internally threadedly connected to the second support seat 6, a second mounting hole is opened in the middle of the second support seat 6, and the connecting rod 42 is threadedly connected to the second mounting hole; the second support seat 6 is opened with several second through holes connecting to the central flow channel of the secondary drill collar 2.

[0050] Specifically, the connecting rod 42 is fixed in the central flow channel of the secondary drill collar 2 through the second support seat 6, and the second support seat 6 and the secondary drill collar 2, and the second support seat 6 and the connecting rod 42 are all threadedly connected. Among them, the second support seat 6 is provided with a plurality of second through holes, and the second through holes are used to connect the central flow channel above it and the central flow channel below it.

[0051] In this embodiment, the second support seat 6 and the secondary drill collar 2, as well as the second support seat 6 and the connecting rod 42 are all threadedly connected, so it is convenient to adjust the outer tube body 41 and the connecting rod 42 accordingly after the primary drill collar 1 and / or the secondary drill collar 2 are repaired.

[0052] In one embodiment, the first connecting pin 7 and / or the second connecting pin 8 are male pins, the lower end of the inner cylinder 3 extends into the outer cylinder body 41, and sealing rings are provided between the second gasket 10 and the inner cylinder 3 and between the inner cylinder 3 and the outer cylinder body 41; a first convex ring is provided on the outer side of the inner cylinder 3, and the second gasket 10 is sleeved on the inner cylinder 3 between the first convex ring and the outer cylinder body 41.

[0053] Since the male pin needs to be sealed, the lower end of the inner cylinder 3 of this embodiment extends into the outer cylinder body 41, and sealing rings are provided between the second gasket 10 and the inner cylinder 3, and between the inner cylinder 3 and the outer cylinder body 41, thereby isolating the male pin from the mud.

[0054] In one embodiment, the connecting rod 42 is threadedly connected to the outer cylinder body 41, and a third gasket 11 is arranged between the connecting rod 42 and the outer cylinder body 41; the outer cylinder body 41 extends into the connecting rod 42, and a sealing ring is arranged between the outer cylinder body 41 and the connecting rod 42; a second convex ring is arranged on the outer side of the outer cylinder body 41, and the third gasket 11 is sleeved on the outer cylinder body 41 between the second convex ring and the connecting rod 42.

[0055] In this embodiment, the third gasket 11 is sleeved on the outer cylinder body 41 between the second convex ring and the connecting rod 42. The length of the third gasket 11 can be selected as needed, so that the distance between the outer cylinder body 41 and the connecting rod 42 can be adjusted.

[0056] The threaded connection between the connecting rod 42 and the outer cylinder body 41 can facilitate the corresponding adjustment of the distance between the inner cylinder 3 and the outer cylinder body 41 after the buckle is repaired.

[0057] The arrangement of the first gasket 9, the second gasket 10 and the third gasket 11 in the embodiment of the present invention; the threaded connection between the outer cylinder body 41 and the connecting rod 42, and the threaded connection between the connecting rod 42 and the second support seat 6 can ensure the repair distance, so that the interface short section of this embodiment can be adapted to the repair, for example Figure 1 The primary drill collar 1 shown is a double female drill collar with female buckles at both ends, and the secondary drill collar 2 is a drill collar with a male buckle at the upper end and a female buckle at the lower end. When the male buckle at the upper end of the secondary drill collar 2 is repaired, the length of the third gasket 11 can be adjusted according to the repair length; when the female buckle at the lower end of the primary drill collar 1 is repaired, the length of the first gasket 9 and the length of the second gasket 10 need to be adjusted according to the repair length.

[0058] In one embodiment, if Figure 2 As shown, a first circuit board is sealed on the primary drill collar 1, and the first circuit board is arranged between the first connecting joint and one of the first connecting pins 7. The first circuit board is used to divide the received signal into a DC signal and a communication signal, convert the DC signal into an AC signal, and add the converted AC signal and communication signal to the wireless transmitting unit; a second circuit board is sealed on the secondary drill collar 2, and the second circuit board is arranged between the second connecting joint and one of the second connecting pins 8. The second circuit board is used to receive the AC signal and the communication signal transmitted by the second connecting pin 8, convert the AC signal into a DC signal, and transmit the converted DC signal and communication signal to the second connecting joint.

[0059] In this embodiment, a first circuit board is correspondingly provided for processing the signal received by the first connection connector. The signal transmitted by the first connection connector includes a DC signal and a communication signal, and the first circuit board processes the signal including separating the DC signal from the communication signal, converting the DC signal into an AC signal, and adding the converted AC signal and the communication signal to the wireless transmitting unit. The DC signal is converted into an AC signal by the first circuit board, so that the AC signal and the communication signal can be transmitted downward through electromagnetic coupling.

[0060] The second circuit board is used to convert the AC signal in the AC signal and the communication signal into a DC signal, and to transmit the converted DC signal and the communication signal together to the second connection connector.

[0061] Among them, the first circuit board includes a receiving board, which is connected to the first connecting connector, and the receiving board is used to receive the communication signal and the electrical signal on the first connecting connector, and separate the communication signal and the electrical signal; the receiving board is connected to a primary communication board and an inverter board, the primary communication board is used to receive the corresponding communication signal, and the inverter board is used to invert the DC signal received by the receiving board into an AC signal, that is, to invert the 48V DC input of the external power supply into 48V AC, and the primary communication board and the inverter board are both connected to the first connecting pin 7.

[0062] Among them, the second circuit board includes a secondary communication board and a rectifier and voltage regulator board, and both the secondary communication board and the rectifier and voltage regulator board are connected to the second connecting pin 8. The rectifier and voltage regulator board is used to convert the AC signal received by the corresponding second connecting pin 8 into a DC signal, that is, to rectify the 48V AC power into DC power for supplying the load. The secondary communication board and the rectifier and voltage regulator board are both connected to the transmission board, and the transmission board is connected to the second connecting connector. The transmission board is also used to integrate the communication signal and the electrical signal and send them to the second connecting connector.

[0063] It should be noted that the receiving board separates the power and signal transmitted from the upper link and enters the system power path and signal path respectively; the transmission board integrates the power and signal processed by the energy path and signal path respectively and sends them to the lower link together. The sending (modulation) of the secondary signal board signal and the receiving (demodulation) of the primary signal board signal do not pass through the several circuit boards of the energy path, but are directly carried out through the wireless transmitting unit and the wireless receiving unit (coupler).

[0064] Among them, the inverter board is electrically connected to the first connecting pin 7 through the primary tuning board, and the primary tuning board is used to compensate for the AC signal output by the inverter board; the inverter board is connected to the control board, and the inverter board is used to invert the DC signal received by the receiving board into an AC signal under the control signal of the control board; a first power module is arranged on the control board, and the first power module is connected to the primary communication board; the rectifier and voltage regulator board includes a rectifier board and a voltage regulator board, and the rectifier board is electrically connected to the second connecting pin 8, and the rectifier board is used to convert the AC signal received by the second connecting pin 8 into a DC signal, and the voltage regulator board is used to stabilize the DC signal, that is, the voltage regulator board is used to boost and stabilize the DC signal to a 48V DC power that meets the use standard to supply the load; a second power module is arranged on the voltage regulator board, and the second power module is connected to the secondary communication board; a secondary tuning board is also arranged between the rectifier board and the second connecting pin 8, and the secondary tuning board is used to compensate for the AC signal received by the second connecting pin 8.

[0065] An embodiment of the present invention further provides a directional drilling instrument string, which includes an interface nipple according to any one of the above embodiments.

[0066] Specifically, the configuration of the interface nipple in this embodiment makes the connection operation between the while-drilling and directional instrument strings close to the common downhole drill collar connection, which saves wellhead time and improves the reliability of the connection.

[0067] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0068] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An interface nipple, characterized in that: It comprises a primary drill collar and a secondary drill collar fixedly connected to the lower part of the primary drill collar, wherein an inner cylinder is fixedly arranged in the central flow channel of the primary drill collar, and an outer cylinder is fixedly arranged in the central flow channel of the secondary drill collar; The upper end of the inner tube is fixedly connected with a first connection joint, the lower end of the inner tube is fixedly connected with two first connection pins, the first connection joint is respectively connected with the two first connection pins, and a wireless transmitting unit is connected between the two first connection pins; The upper end of the outer tube is fixedly connected with two second connection pins, the lower end of the outer tube is fixedly connected with a second connection joint, the second connection joint is respectively connected with the two second connection pins, and a wireless receiving unit is connected between the two second connection pins; The wireless transmitting unit and the wireless receiving unit are connected via electromagnetic coupling; A first support seat is fixedly connected in the central flow channel of the primary drill collar, a first mounting hole is opened in the middle of the first support seat, and the inner tube is fixed in the first mounting hole; a plurality of first through holes connected to the central flow channel of the primary drill collar are opened on the first support seat; the primary drill collar is threadedly connected to the secondary drill collar, and a first gasket is arranged between the primary drill collar and the secondary drill collar, and the first gasket is arranged to make the length between the primary drill collar and the secondary drill collar adjustable; The outer cylinder comprises an outer cylinder body and a connecting rod, a second gasket is arranged between the inner cylinder and the outer cylinder body, the outer cylinder body and the connecting rod are fixedly connected, and the connecting rod is fixedly connected to the secondary drill collar; two second connecting pins are arranged at the upper end of the outer cylinder body, and the second connecting joint is arranged at the lower end of the connecting rod; the length of the second gasket can be selected as needed so that the distance between the inner cylinder and the outer cylinder body can be adjusted; sealing rings are arranged between the second gasket and the inner cylinder, and between the inner cylinder and the outer cylinder body.

2. The interface nipple according to claim 1, characterized in that: The wireless transmitting unit comprises a primary coil and a primary magnetic core, both of which are arranged on the inner cylinder, two ends of the primary coil are electrically connected to corresponding first connecting pins respectively, and the primary coil is sleeved on the primary magnetic core; The wireless receiving unit comprises a secondary coil and a secondary magnetic core arranged on the outer cylinder, two ends of the secondary coil are electrically connected to corresponding second connecting pins respectively, and the secondary coil is sleeved on the secondary magnetic core; The wireless transmitting unit formed by the primary coil and the primary magnetic core is connected with the wireless receiving unit formed by the secondary coil and the secondary magnetic core through electromagnetic coupling.

3. The interface nipple according to claim 1, characterized in that: The central flow channel of the secondary drill collar is internally threadedly connected to a second support seat, a second mounting hole is provided in the middle of the second support seat, and the connecting rod is threadedly connected to the second mounting hole; the second support seat is provided with a plurality of second through holes connected to the central flow channel of the secondary drill collar.

4. The interface nipple according to claim 1, characterized in that: The first connecting pin and / or the second connecting pin are male pins, and the lower end of the inner cylinder extends into the outer cylinder body; a first convex ring is provided on the outer side of the inner cylinder, and the second gasket is sleeved on the inner cylinder between the first convex ring and the outer cylinder body.

5. The interface nipple according to claim 1, characterized in that: The connecting rod is threadedly connected to the outer cylinder body, and a third gasket is arranged between the connecting rod and the outer cylinder body; the outer cylinder body extends into the connecting rod, and a sealing ring is arranged between the outer cylinder body and the connecting rod; a second convex ring is arranged on the outer side of the outer cylinder body, and the third gasket is sleeved on the outer cylinder body between the second convex ring and the connecting rod.

6. The interface nipple according to claim 1, characterized in that: A first circuit board is sealed on the primary drill collar, the first circuit board is arranged between the first connection joint and one of the first connection pins, the first circuit board is used to divide the received signal into a direct current signal and a communication signal, convert the direct current signal into an alternating current signal, and add the converted alternating current signal and communication signal to the wireless transmitting unit; A second circuit board is sealed on the secondary drill collar, and the second circuit board is arranged between the second connecting joint and one of the second connecting pins. The second circuit board is used for receiving the AC signal and the communication signal transmitted by the second connecting pin, converting the AC signal into a DC signal, and transmitting the converted DC signal and communication signal to the second connecting joint.

7. The interface nipple according to claim 6, characterized in that: The first circuit board includes a receiving board, which is connected to the first connecting connector and is used to receive communication signals and electrical signals on the first connecting connector and separate the communication signals from the electrical signals; the receiving board is connected to a primary communication board and an inverter board, the primary communication board is used to receive corresponding communication signals, and the inverter board is used to invert the DC signal received by the receiving board into an AC signal, and both the primary communication board and the inverter board are connected to the first connecting pin.

8. The interface nipple according to claim 7, characterized in that: The second circuit board includes a secondary communication board and a rectifier and voltage regulator board, and the secondary communication board and the rectifier and voltage regulator board are both connected to the second connecting pins. The rectifier and voltage regulator board is used to convert the AC signal received by the corresponding second connecting pin into a DC signal. The secondary communication board and the rectifier and voltage regulator board are both connected to a transmission board, and the transmission board is connected to the second connecting connector. The transmission board is also used to integrate the communication signal and the electrical signal and send them to the second connecting connector.

9. The interface nipple according to claim 8, characterized in that: The inverter board is electrically connected to the first connection pin via a primary tuning board, and the primary tuning board is used to compensate for the AC power signal output by the inverter board; The inverter board is connected to a control board, and the inverter board is used to invert the DC signal received by the receiving board into an AC signal under the control signal of the control board; a first power module is arranged on the control board, and the first power module is connected to the primary communication board; The rectifier and voltage regulator board includes a rectifier board and a voltage regulator board, the rectifier board is electrically connected to the second connection pin, the rectifier board is used to convert the AC signal received by the second connection pin into a DC signal, and the voltage regulator board is used to perform voltage stabilization processing on the DC signal; a second power supply module is arranged on the voltage regulator board, and the second power supply module is connected to the secondary communication board; A secondary harmonic board is further provided between the rectifier board and the second connecting pin, and the secondary harmonic board is used to compensate for the alternating current signal received by the second connecting pin.

10. A drilling and directional control instrument string, characterized in that: The invention comprises the interface short section as described in any one of claims 1 to 9.

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