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; a first connection joint is fixedly connected in the central flow channel at the upper end of the primary drill collar, two first connection pins are fixedly connected at the lower end of the primary drill collar, 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 at the upper end of the secondary drill collar, a second connection joint is fixedly connected in the central flow channel at the lower end of the secondary drill collar, the second connection joint is connected to 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 by electromagnetic coupling. The interface sub of the present invention adopts electromagnetic coupling connection, and the inner tube and the outer tube do not need to occupy the flow channel area; the present invention can greatly reduce the wellhead instrument connection time.

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. The interface short section in the prior art adopts a center docking method, that is, the electrical connector of the electrical connection part is placed in the center of the flow channel of the drill collars of the two instruments, and the electrical connector is docked during the docking process of the drill collars. However, this connection method has the problems of cumbersome wellhead docking, long time, and the need to occupy the cross-sectional area of ​​the flow channel. Another interface short section in the prior art adopts a 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 cause the drill collar buckle type to be non-standard, which will lead to a series of problems such as high cost of later repair buckles, 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 can be quickly connected without measuring the compression of the hard connection and the adapter head; and after the connection, it does not occupy the flow channel area and has low pressure loss.

[0005] According to one aspect of the present invention, there is provided an interface sub, comprising a primary drill collar and a secondary drill collar fixedly connected to the lower portion of the primary drill collar;

[0006] A first connection joint is fixedly connected in the central flow channel at the upper end of the primary drill collar, and two first connection pins are fixedly connected to the lower end of the primary drill collar. The first connection joint is respectively connected to the two first connection pins, and a wireless transmitting unit is connected between the two first connection pins.

[0007] The upper end of the secondary drill collar is fixedly connected to two second connection pins, the central flow channel at the lower end of the secondary drill collar is fixedly connected to a second connection joint, the second connection joint is respectively connected to 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, mutually communicating mounting grooves are provided in the central flow channel of the primary drill collar and the central flow channel of the secondary drill collar, and an inner tube and an outer tube are provided in the mounting grooves, the lower end of the inner tube is in contact with the upper end of the outer tube, and the upper end of the inner tube and the lower end of the outer tube are in contact with the side wall of the mounting groove;

[0010] Two third connection pins are arranged at the upper end of the inner cylinder, each of the first connection pins is plug-connected with one of the third connection pins respectively, the wireless transmitting unit is arranged on the inner cylinder, and the wireless transmitting unit is connected between the two third connection pins;

[0011] Two fourth connecting pins are arranged at the lower end of the outer cylinder, each of the second connecting pins is plug-connected with one of the fourth connecting pins respectively, and the wireless receiving unit is arranged on the outer cylinder, and the wireless receiving unit is connected between the two fourth connecting pins.

[0012] Furthermore, the first connecting pin and the second connecting pin are male pins, the third connecting pin and the fourth connecting pin are female pins, the upper end of the inner tube and the lower end of the outer tube are both provided with plug rings, the inner wall of the primary drill collar and the inner wall of the secondary drill collar are both provided with slots that cooperate with the corresponding plug rings, and the side walls of the plug rings are sealed and connected with the side walls of the corresponding slots.

[0013] Furthermore, the primary drill collar is fixedly connected to the inner cylinder, the secondary drill collar is fixedly connected to the outer cylinder, and an elastic structure is provided between the inner cylinder and the outer cylinder.

[0014] Furthermore, a first extension ring extending downward is fixedly connected to the inner side of the inner cylinder, and the first extension ring is a stepped structure with equal inner diameters, a larger outer diameter at the upper part and a smaller outer diameter at the lower part. The elastic structure is sleeved on the first extension ring, and the upper end of the elastic structure abuts against the step of the first extension ring, and the lower end of the elastic structure abuts against the inner side of the outer cylinder; the elastic structure is a spring.

[0015] Further, a pin is connected between the lower end of the outer cylinder and the secondary drill collar, the axial direction of the pin is parallel to the axial direction of the secondary drill collar, a locking nut is threadedly connected to the inner side wall of the secondary drill collar, the locking nut is located above the outer cylinder, and the outer cylinder is limited and fixed in the mounting groove of the secondary drill collar by the pin and the locking nut;

[0016] The outer side of the outer tube is fixedly connected with a second extension ring extending upward, the locking nut is located between the second extension ring and the inner tube, and an elastic gasket is arranged between the outer side of the inner tube and the locking nut;

[0017] The inner tube is fixedly connected to the primary drill collar via screws.

[0018] Further, the wireless transmitting unit comprises a primary coil and a primary magnetic core arranged on the primary drill collar, two ends of the primary coil are respectively connected to corresponding first connecting pins, and the primary coil is sleeved on the primary magnetic core;

[0019] The wireless receiving unit comprises a secondary coil and a secondary magnetic core arranged on the secondary drill collar, two ends of the secondary coil are respectively connected to corresponding second connecting pins, and the secondary coil is sleeved on the secondary magnetic core;

[0020] 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.

[0021] 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;

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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;

[0026] 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;

[0027] 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;

[0028] 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.

[0029] Furthermore, a first mounting hole is opened on the side wall of the primary drill collar, a first cover plate for sealing the first mounting hole is sealed and fixedly connected to the primary drill collar, and the first circuit board is fixedly arranged in the first mounting hole;

[0030] A second mounting hole is opened on the side wall of the secondary drill collar, a second cover plate for sealing the second mounting hole is sealed and fixedly connected to the secondary drill collar, and the second circuit board is fixedly arranged in the second mounting hole.

[0031] The present invention also provides a while-drilling and directional drilling instrument string, comprising any one of the above described interface short sections.

[0032] It can be seen from the above technical solution that the interface nipple provided by the present invention has the following beneficial effects:

[0033] The interface nipple of the present invention adopts electromagnetic coupling connection, and the inner tube and the outer tube do not need to occupy the flow channel area, ensuring that the instrument flow rate is low and the pressure drop is small; 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 connection time of the wellhead instrument; the primary drill collar and the inner tube, the secondary drill collar and the outer tube of the present invention are connected by pin plugging, which ensures the reliability of the electrical connection; the setting of the elastic structure of the present invention ensures reliable docking; the present invention can be adapted to the repair buckle, and the setting of the elastic gasket can ensure the repair buckle distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of an interface short section according to an embodiment of the present invention;

[0035] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0036] Figure 3 The schematic diagram of the circuit of the first circuit board and the second circuit board of the embodiment of the present invention;

[0037] The reference numerals in the figure are: primary drill collar 1, first connecting joint 2, first cover plate 3, first mounting hole 31, first connecting pin 4, third connecting pin 5, inner tube 6, plug ring 61, first extension ring 62, elastic gasket 7, locking nut 8, outer tube 9, second extension ring 91, elastic structure 10, secondary drill collar 11, second cover plate 12, second connecting joint 13, second connecting pin 14, fourth connecting pin 15. DETAILED DESCRIPTION

[0038] In order to better understand the purpose, structure and function of the present invention, an interface short section of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0039] like Figure 1 , Figure 2 As shown, it shows an interface short section according to an embodiment of the present invention, comprising a primary drill collar 1 and a secondary drill collar 11 fixedly connected to the lower part of the primary drill collar 1 .

[0040] The secondary drill collar 11 is fixedly connected to the lower end of the primary drill collar 1, and the primary drill collar 1 and the secondary drill collar 11 are fixedly connected, for example, by threads. Figure 1The primary drill collar 1 is a drill collar with a female buckle at the upper end and a male buckle at the lower end, and the secondary drill collar 11 is a double female drill collar; the upper end of the primary drill collar 1 is used to connect to the pipe column above it, and the lower end of the secondary drill collar 11 is used to connect to the pipe column below it; in specific applications, the secondary drill collar 11 can also be a drill collar with a female buckle at the upper end and a male buckle at the lower end; the primary drill collar 1 can also be a double male drill collar.

[0041] A first connecting joint 2 is fixedly connected in the central flow channel at the upper end of the primary drill collar 1, and two first connecting pins 4 are fixedly connected to the lower end of the primary drill collar 1. The first connecting joint 2 is connected to the two first connecting pins 4 respectively, and a wireless transmitting unit is connected between the two first connecting pins 4.

[0042] The first connection joint 2 is used to receive communication signals and electrical signals from the upper pipe string. For example, after the upper end of the primary drill collar 1 is connected to the pipe string above it, the first connection joint 2 is connected to the electrical connection part of the upper pipe string, so the communication signals and electrical signals of the upper pipe string can be transmitted to the first connection joint 2. The first connection joint 2 is respectively connected to the two first connection pins 4, and the wireless transmitting unit is connected between the two first connection pins 4, that is, the first connection joint 2, the two first connection pins 4 and the wireless transmitting unit form a closed loop.

[0043] Two second connection pins 14 are fixedly connected to the upper end of the secondary drill collar 11, and a second connection joint 13 is fixedly connected in the central flow channel at the lower end of the secondary drill collar 11. The second connection joint 13 is respectively connected to the two second connection pins 14, and a wireless receiving unit is connected between the two second connection pins 14.

[0044] The second connection joint 13 is used to transmit communication signals and electrical signals to the pipe column below. For example, after the second connection joint 13 is connected to the pipe column below, the second connection joint 13 can transmit the received electrical signals and communication signals to the pipe column below. The second connection joint 13 is respectively connected to the two second connection pins 14, and the wireless receiving unit is connected between the two second connection pins 14, that is, the second connection joint 13, the two second connection pins 14 and the wireless receiving unit form a closed loop.

[0045] The wireless transmitting unit of the present application is used to transmit electrical signals and communication signals to the outside, and the wireless receiving unit is used to receive electrical signals and communication signals. The wireless transmitting unit and the wireless receiving unit of the present application are connected through electromagnetic coupling.

[0046] Specifically, after the primary drill collar 1 receives the electrical signal and communication signal from the pipe string above it, it transmits the signal to the wireless receiving unit on the secondary drill collar 11 through the first connecting pin 4 at the lower end and the wireless transmitting unit, and the wireless receiving unit transmits the received signal to the pipe string below through the second connecting connector 13.

[0047] 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.

[0048] In one embodiment, mutually connected mounting grooves are provided in the central flow channel of the primary drill collar 1 and the central flow channel of the secondary drill collar 11, and an inner cylinder 6 and an outer cylinder 9 are provided in the mounting grooves, the lower end of the inner cylinder 6 is in contact with the upper end of the outer cylinder 9, and the upper end of the inner cylinder 6 and the lower end of the outer cylinder 9 are both in contact with the side walls of the mounting grooves; two third connecting pins 5 are provided at the upper end of the inner cylinder 6, each first connecting pin 4 is respectively plug-connected with one of the third connecting pins 5, a wireless transmitting unit is provided on the inner cylinder 6, and the wireless transmitting unit is connected between the two third connecting pins 5; two fourth connecting pins 15 are provided at the lower end of the outer cylinder 9, each second connecting pin 14 is respectively plug-connected with one of the fourth connecting pins 15, a wireless receiving unit is provided on the outer cylinder, and the wireless receiving unit is connected between the two fourth connecting pins 15.

[0049] The present embodiment also includes an inner cylinder 6 and an outer cylinder 9, which are limitedly set in the installation groove between the primary drill collar 1 and the secondary drill collar 11. The inner diameters of the primary drill collar, the secondary drill collar, the inner cylinder and the outer cylinder are equal. The two third connecting pins 5 on the inner cylinder 6 are plugged and connected with the two first connecting pins 4 on the primary drill collar 1, and the two fourth connecting pins 15 on the outer cylinder 9 are plugged and connected with the two second connecting pins 14 on the secondary drill collar 11. The wireless transmitting unit is set on the inner cylinder 6, and the two ends of the wireless transmitting unit are respectively connected to a third connecting pin 5. The wireless receiving unit is set on the outer cylinder 9, and the two ends of the wireless receiving unit are respectively connected to a fourth connecting pin 15.

[0050] The connection method of this embodiment realizes the radio connection between the primary drill collar 1 and the secondary drill collar 11 .

[0051] Secondly, the inner cylinder 6 and the outer cylinder 9 of this embodiment are limited between the primary drill collar 1 and the secondary drill collar 11. During installation, the first connecting pin 4 is plugged and connected with the third connecting pin 5, the second connecting pin 14 is plugged and connected with the fourth connecting pin 15, and then the primary drill collar 1 and the secondary drill collar 11 are screwed together. After the primary drill collar 1 and the secondary drill collar 11 are fixedly connected together, the inner cylinder 6 and the outer cylinder 9 are limited in the installation groove between the primary drill collar 1 and the secondary drill collar 11.

[0052] In one embodiment, the first connecting pin 4 and the second connecting pin 14 are male pins, the third connecting pin 5 and the fourth connecting pin 15 are female pins, the upper end of the inner tube 6 and the lower end of the outer tube 9 are both provided with an insert ring 61, the inner wall of the primary drill collar 1 and the inner wall of the secondary drill collar 11 are both provided with slots that cooperate with the corresponding insert rings 61, and the side walls of the insert ring 61 are sealed and connected with the side walls of the corresponding slots.

[0053] In this embodiment, the first connecting pin 4 and the second connecting pin 14 are male pins, which need to be isolated from the mud in the central flow channel. Therefore, in this embodiment, a sealing ring is provided at the fitting position of the insert ring 61 and the slot to prevent the mud and the connection between the male pin and the female pin from affecting the male pin.

[0054] In view of the situation that the inner cylinder 6 and the outer cylinder 9 are limited between the primary drill collar 1 and the secondary drill collar 11, in specific implementation, the primary drill collar 1 can also be fixedly connected to the inner cylinder 6, and the secondary drill collar 11 can be fixedly connected to the outer cylinder 9. Correspondingly, in specific installation, the first connecting pin 4 is plugged and connected with the third connecting pin 5, and the primary drill collar 1 and the inner cylinder 6 are fixed together; then the second connecting pin 14 is plugged and connected with the fourth connecting pin 15, and the secondary drill collar 11 and the outer cylinder 9 are fixed together; finally, the primary drill collar 1 and the secondary drill collar 11 are screwed together.

[0055] In addition, an elastic structure 10 is provided between the inner cylinder 6 and the outer cylinder 9. The provision of the elastic structure 10 in this embodiment enables elastic contact between the inner cylinder 6 and the outer cylinder 9. Specifically, a first extension ring 62 extending downward is fixedly connected to the inner side of the inner cylinder 6, and the first extension ring 62 is a stepped structure with equal inner diameters, a large outer diameter at the upper part and a small outer diameter at the lower part. The elastic structure 10 is sleeved on the first extension ring 62, and the upper end of the elastic structure 10 abuts against the step of the first extension ring 62, and the lower end of the elastic structure 10 abuts against the inner side of the outer cylinder 9; the elastic structure 10 is a spring.

[0056] The first extension ring 62 of this embodiment is a stepped structure with equal inner diameters, a larger outer diameter at the upper part and a smaller outer diameter at the lower part. The upper end of the elastic structure 10 abuts against the step on the outer diameter of the first extension ring 62, and the lower end of the elastic structure 10 abuts against the inner side of the outer cylinder 9. The arrangement of this embodiment achieves the purpose of arranging the elastic structure 10 between the inner cylinder 6 and the outer cylinder 9. In specific implementation, for example, the elastic structure 10 is a spring, a disc spring, etc.

[0057] As an alternative, Figure 1 As shown, the inner side of the inner cylinder 6 is fixedly connected with a first extension ring 62 extending downward, and the lower end of the first extension ring 62 is fixedly connected to the stopper at the upper end of the connecting ring by screws. The elastic structure 10 is sleeved on the connecting ring, and the upper end of the elastic structure 10 abuts against the stopper at the upper end of the connecting ring, and the lower end of the elastic structure 10 abuts against the inner side of the outer cylinder 9.

[0058] As can be seen from the foregoing, in order to facilitate connection, the inner tube 6 and the primary drill collar 1 can be set to be fixedly connected. Specifically, for example, the inner tube 6 is set to be fixedly connected to the primary drill collar 1 by screws. The screw connection has the advantage of convenient connection.

[0059] The outer cylinder 9 and the secondary drill collar 11 can also be set to be fixedly connected. Specifically, a pin is connected between the lower end of the outer cylinder 9 and the secondary drill collar 11, and the axial direction of the pin is parallel to the axial direction of the secondary drill collar 11. A locking nut 8 is threadedly connected to the inner wall of the secondary drill collar 11, and the locking nut 8 is located above the outer cylinder 9. The outer cylinder 9 is limited and fixed in the installation groove of the secondary drill collar 11 by the pin and the locking nut 8.

[0060] In this embodiment, the secondary drill collar 11 and the outer cylinder 9 are connected by a pin, and the axial direction of the pin is parallel to the axial direction of the secondary drill collar 11, so the outer cylinder 9 will not rotate relative to the secondary drill collar 11 in the secondary drill collar 11 through the connection of the pin; again, the inner wall of the secondary drill collar 11 is threadedly connected with a locking nut 8, and the locking nut 8 is located above the outer cylinder 9, so by adjusting the locking nut 8 downward, the outer cylinder 9 can be pressed against the side wall of the installation groove by the locking nut 8. Therefore, in the case where the installation groove is set on the secondary drill collar 11, the purpose of fixing the outer cylinder 9 on the secondary drill collar 11 is achieved by the pin and the locking nut 8 in this embodiment.

[0061] In one embodiment, the outer side of the outer tube 9 is fixedly connected with a second extension ring 91 extending upward, the locking nut 8 is located between the second extension ring 91 and the inner tube 6 , and an elastic gasket 7 is provided between the outer side of the inner tube 6 and the locking nut 8 .

[0062] In this embodiment, the second extension ring 91 is fixedly connected to the outside of the outer tube 9, the first extension ring 62 is located inside the second extension ring 91, and the locking nut 8 is located between the second extension ring 91 and the inner tube 6. In this embodiment, an elastic gasket 7 is provided between the outer side of the inner tube 6 and the locking nut 8.

[0063] The arrangement of this embodiment can be adapted to instrumental buckle repair. When repairing the male buckle on the primary drill collar 1, it is only necessary to re-process the pin hole corresponding to the first connecting pin 4 according to the length of the buckle repair; when repairing the female buckle on the secondary drill collar 11, it is only necessary to reduce the length of the elastic gasket 7 accordingly according to the length of the buckle repair.

[0064] In one embodiment, the wireless transmitting unit includes a primary coil and a primary magnetic core arranged on the primary drill collar 1, the two ends of the primary coil are respectively connected to the corresponding first connecting pins 4, 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 secondary drill collar 11, the two ends of the secondary coil are respectively connected to the corresponding second connecting pins 14, 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.

[0065] 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 4; 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 14.

[0066] For the case where the first connection pin 4 is plugged and connected with the third connection pin 5 and the second connection pin 14 is plugged and connected with the fourth connection pin 15 after the inner cylinder 6 and the outer cylinder 9 are set: the two ends of the primary coil of this embodiment can be connected with the two third connection pins 5 respectively, so that the first connection joint 2, the two first connection pins 4, the two third pins and the primary coil form a closed loop; the two ends of the secondary coil of this embodiment can be connected with the two fourth connection pins 15 respectively, so that the second connection joint 13, the two second connection pins 14, the two fourth pins and the secondary coil form a closed loop. In this case, the primary coil and the primary magnetic core are correspondingly set on the inner cylinder 6 fixedly connected to the primary drill collar 1, and the secondary coil and the secondary magnetic core are set on the outer cylinder 9 fixedly connected to the secondary drill collar 11.

[0067] Regarding the transmission of communication signals and electrical signals: after the inner tube 6 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 2, the two first connecting pins 4 and the two third connecting pins. After receiving the signal, the secondary coil converts the signal into an electrical signal, which is transmitted to the second connecting joint 13 through the loop of the second connecting joint 13, the two second connecting pins 14 and the two fourth connecting pins 15, and then transmitted to the pipe column below through the second connecting joint 13.

[0068] In one embodiment, if Figure 3As 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 2 and one of the first connecting pins 4. 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 11, and the second circuit board is arranged between the second connecting joint 13 and one of the second connecting pins 14. The second circuit board is used to receive the AC signal and the communication signal transmitted by the second connecting pin 14, convert the AC signal into a DC signal, and transmit the converted DC signal and communication signal to the second connecting joint 13.

[0069] In this embodiment, a first circuit board is correspondingly provided for processing the signal received by the first connection connector 2. The signal transmitted by the first connection connector 2 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.

[0070] 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 13 .

[0071] Among them, the first circuit board includes a receiving board, which is connected to the first connecting connector 2, and the receiving board is used to receive the communication signal and the electrical signal on the first connecting connector 2, 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 4.

[0072] Among them, 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 pin 14. The rectifier and voltage regulator board is used to convert the AC signal received by the corresponding second connecting pin 14 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 13. The transmission board is also used to integrate the communication signal and the electrical signal and send them to the second connecting connector 13.

[0073] 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).

[0074] Among them, the inverter board is electrically connected to the first connecting pin 4 through the primary harmonic board, and the primary harmonic 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 14, and the rectifier board is used to convert the AC signal received by the second connecting pin 14 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 harmonic board is also arranged between the rectifier board and the second connecting pin 14, and the secondary harmonic board is used to compensate for the AC signal received by the second connecting pin 14.

[0075] In one embodiment, a first mounting hole 31 is opened on the side wall of the primary drill collar 1, and the primary drill collar 1 is sealed and fixedly connected with a first cover plate 3 for sealing the first mounting hole 31, and the first circuit board is fixedly arranged in the first mounting hole 31; a second mounting hole is opened on the side wall of the secondary drill collar 11, and the secondary drill collar 11 is sealed and fixedly connected with a second cover plate 12 for sealing the second mounting hole, and the second circuit board is fixedly arranged in the second mounting hole.

[0076] In this embodiment, the first circuit board is arranged in the first mounting hole 31, and the first circuit board is isolated from the mud by the fixed sealing connection between the primary drill collar 1 and the first cover plate 3; the second circuit board is arranged in the second mounting hole, and the second circuit board is isolated from the mud by the fixed sealing connection between the secondary drill collar 11 and the second cover plate 12.

[0077] The interface nipple of the embodiment of the present invention adopts electromagnetic coupling connection, and the inner tube 6 and the outer tube 9 do not need to occupy the flow channel area, ensuring that the instrument flow rate is low and the pressure drop is small; when docking at the wellhead in this embodiment, there is no need to calculate the compression amount of the hard connection and the adapter head, which can greatly reduce the connection time of the wellhead instrument; in this embodiment, the primary drill collar 1 and the inner tube 6, the secondary drill collar 11 and the outer tube 9 are connected by pin plugging, which ensures the reliability of the electrical connection; the setting of the elastic structure 10 in this embodiment ensures reliable docking; this embodiment can be adapted for repair buckles, and the setting of the elastic gasket 7 can ensure the repair buckle distance.

[0078] An embodiment of the present invention further provides a while-drilling and directional drilling instrument string, comprising an interface nipple according to any one of the above embodiments.

[0079] 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.

[0080] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0081] 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.

[0082] 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; A first connection joint is fixedly connected in the central flow channel at the upper end of the primary drill collar, and two first connection pins are fixedly connected to the lower end of the primary drill collar. The first connection joint is respectively connected to the two first connection pins, and a wireless transmitting unit is connected between the two first connection pins. The upper end of the secondary drill collar is fixedly connected to two second connection pins, the central flow channel at the lower end of the secondary drill collar is fixedly connected to a second connection joint, the second connection joint is respectively connected to 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; The central flow channel of the primary drill collar and the central flow channel of the secondary drill collar are provided with mutually connected mounting grooves, and the mounting grooves are provided with an inner cylinder and an outer cylinder, the lower end of the inner cylinder is in contact with the upper end of the outer cylinder, and the upper end of the inner cylinder and the lower end of the outer cylinder are both in contact with the side wall of the mounting groove; Two third connection pins are arranged at the upper end of the inner cylinder, each of the first connection pins is plug-connected with one of the third connection pins respectively, the wireless transmitting unit is arranged on the inner cylinder, and the wireless transmitting unit is connected between the two third connection pins; Two fourth connecting pins are arranged at the lower end of the outer cylinder, and each of the second connecting pins is plug-connected with one of the fourth connecting pins respectively. The wireless receiving unit is arranged on the outer cylinder, and the wireless receiving unit is connected between the two fourth connecting pins. The inner diameters of the primary drill collar, the secondary drill collar, the inner cylinder and the outer cylinder are equal.

2. The interface nipple according to claim 1, characterized in that: The first connecting pin and the second connecting pin are male pins, the third connecting pin and the fourth connecting pin are female pins, the upper end of the inner tube and the lower end of the outer tube are both provided with plug rings, the inner wall of the primary drill collar and the inner wall of the secondary drill collar are both provided with slots that cooperate with the corresponding plug rings, and the side walls of the plug rings are sealed and connected with the side walls of the corresponding slots.

3. The interface nipple according to claim 1, characterized in that: The primary drill collar is fixedly connected to the inner cylinder, the secondary drill collar is fixedly connected to the outer cylinder, and an elastic structure is arranged between the inner cylinder and the outer cylinder.

4. The interface nipple according to claim 3, characterized in that: A first extending ring extending downward is fixedly connected to the inner side of the inner cylinder. The first extending ring is a stepped structure with equal inner diameters, a larger outer diameter at the upper part and a smaller outer diameter at the lower part. The elastic structure is sleeved on the first extending ring, and the upper end of the elastic structure abuts against the step of the first extending ring, and the lower end of the elastic structure abuts against the inner side of the outer cylinder. The elastic structure is a spring.

5. The interface nipple according to claim 3, characterized in that: A pin is connected between the lower end of the outer cylinder and the secondary drill collar, the axial direction of the pin is parallel to the axial direction of the secondary drill collar, a locking nut is threadedly connected to the inner side wall of the secondary drill collar, the locking nut is located above the outer cylinder, and the outer cylinder is limited and fixed in the installation groove of the secondary drill collar by the pin and the locking nut; The outer side of the outer tube is fixedly connected with a second extension ring extending upward, the locking nut is located between the second extension ring and the inner tube, and an elastic gasket is arranged between the outer side of the inner tube and the locking nut; The inner tube is fixedly connected to the primary drill collar via screws.

6. The interface nipple according to claim 1, characterized in that: The wireless transmitting unit comprises a primary coil and a primary magnetic core arranged on the primary drill collar, two ends of the primary coil are respectively connected to corresponding first connecting pins, 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 secondary drill collar, two ends of the secondary coil are respectively connected to corresponding second connecting pins, 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.

7. 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.

8. The interface nipple according to claim 7, 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.

9. The interface nipple according to claim 8, 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.

10. The interface nipple according to claim 9, 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.

11. The interface nipple according to claim 7, characterized in that: A first mounting hole is formed on the side wall of the primary drill collar, a first cover plate for sealing the first mounting hole is sealed and fixedly connected to the primary drill collar, and the first circuit board is fixedly disposed in the first mounting hole; A second mounting hole is opened on the side wall of the secondary drill collar, a second cover plate for sealing the second mounting hole is sealed and fixedly connected to the secondary drill collar, and the second circuit board is fixedly arranged in the second mounting hole.

12. A drilling and directional control instrument string, characterized in that: Comprising the interface short section described in any one of claims 1-11.

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