Drill pipe multi-stage connector

Abstract

To provide a drill pipe multi-stage connector to which observation equipment can be easily attached in the middle.SOLUTION: A first triplexer 23 of an observation drill pipe of this drill pipe multi-stage connector transmits the high-frequency power and the control signal from a first transmit / receive coil 21 to a power dividing unit 25 and a control signal dividing unit 27, respectively, and transmits the composite observed signal to the first transmit / receive coil 21. The power dividing unit 25 divides a part of the high frequency power and supplies it to a charging unit 26. The control signal dividing unit 27 divides a part of the control signal to control observation equipment 28. The observation signal synthesizing unit 29 transmits a synthetic observation signal of the internal observation signal and the observation signal to the first triplexer 23. A second triplexer 24 transmits the high-frequency power from the power dividing unit 25 and the control signal from the control signal dividing unit 27 to a second transmit / receive coil 22, and transmits the observation signal from the second transmit / receive coil 22 to the observation signal synthesizing unit 29. Power is supplied from the charging unit 26 to the control signal dividing unit 27, the observation equipment 28, and the observation signal synthesizing unit 29.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a drill pipe multi-stage connection system capable of transmitting electric power, control signals and observation signals. [Background technology]

[0002] When performing scientific drilling on the seabed or underground, or when drilling for resources such as oil and natural gas, a multi-stage drill pipe joint, in which drill pipes of a predetermined length are connected in multiple stages, is generally lowered from an offshore or land facility and used. A drilling bit is attached to the tip of the multi-stage drill pipe joint, and observation equipment (e.g., various sensors and cameras) for observing the tip or the surrounding conditions is often attached. Various techniques have been proposed for transmitting power and control signals to the observation equipment and observation signals from the observation equipment through the multi-stage drill pipe joint between the offshore or land facility and the observation equipment. Among them, as shown in Patent Documents 1 to 4, it has been proposed to transmit power, control signals, and observation signals (or only power and control signals) in a non-contact manner at the joints of the drill pipes for stable transmission. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-148784 A [Patent Document 2] Patent Publication No. 2021-136800 [Patent Document 3] U.S. Patent Publication US2004 / 0104797 [Patent Document 4] U.S. Patent Publication US2014 / 0144614 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of drill pipe multi-stage connections used in scientific drilling or resource drilling on the seabed or underground, it may be necessary to observe the condition of the drill pipe multi-stage connection or the surrounding area not only at the tip but also at necessary points along the way.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a drill pipe multi-stage connection that can transmit power, control signals, and observation signals non-contact at drill pipe joints and allow observation equipment to be easily attached at necessary locations along the way. [Means for solving the problem]

[0006] In order to achieve the above object, the drill pipe multi-stage connection described in claim 1 is a drill pipe multi-stage connection in which drill pipes, each having a first power transmitting and receiving coil provided at a first end and a second power transmitting and receiving coil provided at a second end, are connected in multiple stages, and between adjacent drill pipes, high frequency power and a control signal are transmitted from the second power transmitting and receiving coil to the first power transmitting and receiving coil in a non-contact manner, and an observation signal is transmitted from the first power transmitting and receiving coil to the second power transmitting and receiving coil, wherein the drill pipes connected in multiple stages include at least one observation drill pipe, The observation drill pipe includes a first triplexer, a second triplexer, a power splitter, a charging unit, a control signal splitter, an observation instrument, and an observation signal synthesizer between the first power transmitting / receiving coil and the second power transmitting / receiving coil, the first triplexer transmits the high-frequency power and the control signal transmitted from the first power transmitting / receiving coil to the power splitter and the control signal splitter, respectively, and transmits a synthesized observation signal transmitted from the observation signal synthesizer to the first power transmitting / receiving coil as the observation signal. The power splitter is a unit that controls the power transmitted from the first triplexer. the control signal division unit divides a portion of the high frequency power received from the charging unit and supplies the divided portion to the charging unit and transmits the remaining high frequency power to the second triplexer, the charging unit charges the portion of the high frequency power received from the power division unit, the control signal division unit receives power from the charging unit, divides a portion of the control signal transmitted from the first triplexer to control the observation device, and transmits the remaining control signal to the second triplexer, and the observation device receives power from the charging unit and is controlled by the control signal division unit to control the observation device. as an internal observation signal to the observation signal combination unit, the observation signal combination unit is supplied with power from the charging unit, combines the internal observation signal transmitted from the observation device with the observation signal transmitted from the second triplexer, and transmits the combined observation signal to the first triplexer, the second triplexer transmits the high-frequency power transmitted from the power division unit and the control signal transmitted from the control signal division unit to the second transmitting / receiving coil, and transmits the observation signal transmitted from the second transmitting / receiving coil to the observation signal combination unit.

[0007] The drill pipe multi-stage connection as described in claim 2 is the drill pipe multi-stage connection as described in claim 1, wherein the control signal splitting unit has a control signal amplifier, a control signal divider and a control signal demodulator, and the control signal amplifier is supplied with power from the charging unit and amplifies the control signal transmitted from the first triplexer and transmits it to the control signal divider, the control signal divider divides the portion of the control signal amplified by the control signal amplifier and transmits it to the control signal demodulator and transmits the remaining control signal to the second triplexer, and the control signal demodulator is supplied with power from the charging unit and demodulates the portion of the control signal transmitted from the control signal divider to control the observation equipment.

[0008] The drill pipe multi-stage connection as described in claim 3 is the drill pipe multi-stage connection as described in claim 1, wherein the control signal dividing unit has a control signal divider, a control signal demodulator and a control signal output amplifier, the control signal divider divides the portion of the control signal transmitted from the first triplexer and transmits it to the control signal demodulator and transmits the remaining control signal to the control signal output amplifier, the control signal demodulator is supplied with power from the charging unit and demodulates the portion of the control signal transmitted from the control signal divider to control the observation equipment, and the control signal output amplifier is supplied with power from the charging unit and amplifies the remaining control signal transmitted from the control signal divider and transmits it to the second triplexer.

[0009] The drill pipe multi-stage connection according to claim 4 is the drill pipe multi-stage connection according to claim 1, wherein the control signal dividing unit has a control signal amplifier, a control signal divider, a control signal demodulator and a control signal output amplifier, wherein the control signal amplifier is supplied with power from the charging unit and amplifies the control signal transmitted from the first triplexer and transmits it to the control signal divider, the control signal divider divides the portion of the control signal amplified by the control signal amplifier and transmits it to the control signal demodulator and transmits the remaining control signal to the control signal output amplifier, the control signal demodulator is supplied with power from the charging unit and demodulates the portion of the control signal transmitted from the control signal divider to control the observation equipment, and the control signal output amplifier is supplied with power from the charging unit and amplifies the remaining control signal transmitted from the control signal divider and transmits it to the second triplexer.

[0010] The drill pipe multi-stage connection according to claim 5 is the drill pipe multi-stage connection according to any one of claims 1 to 4, wherein the observation signal combination unit has an observation signal amplifier, an observation signal modulator, and an observation signal combiner, wherein the observation signal amplifier is supplied with power from the charging unit and amplifies the observation signal transmitted from the second triplexer and transmits it to the observation signal combiner, the observation signal modulator is supplied with power from the charging unit and modulates the internal observation signal transmitted from the observation equipment and transmits it to the observation signal combiner, and the observation signal combiner combines the internal observation signal transmitted from the observation signal modulator with the observation signal amplified by the observation signal amplifier, and transmits the combined observation signal to the first triplexer.

[0011] The drill pipe multi-stage connection according to claim 6 is the drill pipe multi-stage connection according to any one of claims 1 to 4, wherein the observation signal combiner has an observation signal modulator, an observation signal combiner, and an observation signal output amplifier, wherein the observation signal modulator is supplied with power from the charging unit and modulates the internal observation signal transmitted from the observation equipment and transmits it to the observation signal combiner, the observation signal combiner combines the internal observation signal transmitted from the observation signal modulator and the observation signal transmitted from the second triplexer and transmits the combined observation signal to the observation signal output amplifier, and the observation signal output amplifier is supplied with power from the charging unit and amplifies the combined observation signal transmitted from the observation signal combiner and transmits it to the first triplexer.

[0012] The drill pipe multi-stage connection according to claim 7 is the drill pipe multi-stage connection according to any one of claims 1 to 4, wherein the observation signal combiner has an observation signal amplifier, an observation signal modulator, an observation signal combiner, and an observation signal output amplifier, wherein the observation signal amplifier is supplied with power from the charging unit and amplifies the observation signal transmitted from the second triplexer and transmits it to the observation signal combiner, the observation signal modulator is supplied with power from the charging unit and modulates the internal observation signal transmitted from the observation equipment and transmits it to the observation signal combiner, the observation signal combiner combines the internal observation signal transmitted from the observation signal modulator with the observation signal amplified by the observation signal amplifier and transmits the combined observation signal to the observation signal output amplifier, and the observation signal output amplifier is supplied with power from the charging unit and amplifies the combined observation signal transmitted from the observation signal combiner and transmits it to the first triplexer. Effect of the Invention

[0013] According to the drill pipe multi-stage connection of the present invention, power, control signals, and observation signals can be transmitted non-contact at the joints of the drill pipe, and observation equipment can be easily attached at necessary locations along the way. [Brief description of the drawings]

[0014] [Figure 1] 1 is a side cross-sectional view showing an example of a drill pipe multi-stage connection body according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side cross-sectional view showing an enlarged example of the vicinity of a joint of a drill pipe of the above-mentioned drill pipe multi-stage connection body. [Diagram 3] 4 is a graph showing an example of transmission characteristics of the above drill pipe multi-stage connection body. [Figure 4] FIG. 2 is a block diagram showing an example of a circuit configuration of an observation drill pipe of the above-mentioned drill pipe multi-stage connection. [Diagram 5] FIG. 2 is a circuit diagram showing an example of a circuit of a first triplexer of an observation drill pipe of the drill pipe multi-stage connection structure of the above embodiment. [Figure 6] 6 is a graph showing an example of pass characteristics of the example circuit shown in FIG. 5. [Figure 7] FIG. 2 is a circuit diagram showing an example of a circuit of a power division section of an observation drill pipe of the drill pipe multi-stage connection structure of the same embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described. As shown in FIG. 1, a drill pipe multi-stage connection 1 according to an embodiment of the present invention is formed by connecting drill pipes 2 in multiple stages. Here, drill pipes 2A and drill pipes 2B are collectively referred to as drill pipes 2. The drill pipes 2 connected in multiple stages are mostly composed of drill pipes 2A, but include drill pipes 2B at necessary locations in the drill pipe multi-stage connection 1. For example, one stage of drill pipe 2B can be connected to about 100 stages of drill pipes 2A. The drill pipe 2B is an observation drill pipe. High-frequency power is constantly transmitted to the drill pipe multi-stage connection 1 in a direction from an offshore or land facility toward the tip of the drill pipe multi-stage connection 1, and a control signal is intermittently transmitted (at predetermined intervals) to the drill pipe multi-stage connection 1. In addition, an observation signal synchronized with the control signal is intermittently transmitted to the drill pipe multi-stage connection 1 in a direction from the tip of the drill pipe multi-stage connection 1 toward the offshore or land facility.

[0016] The drill pipe 2 is formed of a hard drill pipe body 2a (typically made of an iron-based metal) and has a hollow hole 2b in the longitudinal direction (vertical direction in FIG. 1). For example, the drill pipe multi-stage connector 1 is controlled by offshore or land facilities, the drill pipe body 2a serves as a power transmission means for drilling the seabed or the underground, and seawater, muddy water, oil, natural gas, etc. flow through the hollow hole 2b. The drill pipe 2 is connected to another drill pipe 2 by forming a screw (in this embodiment, a female screw is formed at the first end 2aa and a male screw is formed at the second end 2ab) at a first end 2aa on the offshore or land facility side and a second end 2ab on the tip side of the drill pipe multi-stage connector 1.

[0017] The drill pipe 2 is not particularly limited, but may have, for example, a diameter of the hollow hole 2b of about 10 cm, a thickness of the drill pipe body 2a where only the hollow hole 2b is formed of about 1 cm, and a longitudinal length of about 10 m. The drill pipes 2A and 2B may have different shapes or longitudinal lengths.

[0018] As shown in FIG. 2, the drill pipe 2 is provided with a first power transmitting / receiving coil 21 at a first end 2aa and a second power transmitting / receiving coil 22 at a second end 2ab. The detailed structure of the first power transmitting / receiving coil 21 and its surroundings is not the subject of the present application and will not be described in detail, but may be the same as the power receiving coil and its surroundings in the above-mentioned Patent Document 1 or Patent Document 2. The detailed structure of the second power transmitting / receiving coil 22 and its surroundings is not the subject of the present application and will not be described in detail, but may be the same as the power transmitting coil and its surroundings in the above-mentioned Patent Document 1 or Patent Document 2. The first power transmitting / receiving coil 21 and the second power transmitting / receiving coil 22 shown in FIG. 2 are each a spiral coil, as in Patent Document 2. The characteristics of FIG. 3, which will be described later, were obtained using a structure similar to that of FIG. 6 of Patent Document 2. In addition, Figure 2 shows the vicinity of the first power transmitting and receiving coil 21 of the drill pipe 2A and the vicinity of the second power transmitting and receiving coil 22 of the drill pipe 2B, but the vicinity of the second power transmitting and receiving coil 22 of the drill pipe 2A does not have the electronic circuit unit 2d described below and is otherwise similar to the vicinity of the second power transmitting and receiving coil 22 of the drill pipe 2B, and the vicinity of the first power transmitting and receiving coil 21 of the drill pipe 2B is similar to the vicinity of the first power transmitting and receiving coil 21 of the drill pipe 2A.

[0019] Between adjacent drill pipes 2, 2 of the drill pipe multi-stage connection body 1, the first power transmitting and receiving coil 21 and the second power transmitting and receiving coil 22 are magnetically coupled without being in physical contact. As a result, between adjacent drill pipes 2, 2, high-frequency power and a control signal are transmitted from the second power transmitting and receiving coil 22 to the first power transmitting and receiving coil 21 in a non-contact manner, and an observation signal is transmitted from the first power transmitting and receiving coil 21 to the second power transmitting and receiving coil 22. The frequencies of the control signal and the observation signal may be either high or low, but are higher than the frequency of the high-frequency power.

[0020] Inside the drill pipe 2 , high frequency power and a control signal are transmitted from the first power transmitting and receiving coil 21 to the second power transmitting and receiving coil 22 , and an observation signal is transmitted from the second power transmitting and receiving coil 22 to the first power transmitting and receiving coil 21 .

[0021] In the drill pipe 2A, the first power transmitting / receiving coil 21 and the second power transmitting / receiving coil 22 can be connected only via the line 2c (usually a coaxial cable). When such drill pipes 2A are connected in multiple stages, a periodic circuit can be formed in which unit cells (unit circuits) constituting one period are connected in multiple stages as shown in the above-mentioned Patent Documents 1 and 2. Curve a shown in FIG. 3 is an example of the transmission efficiency (ηmax) when 100 stages of drill pipes 2A with a length of 10 m are connected, based on a simulation. In the drill pipe multi-stage connection 1, there is a loss due to transmission between the first power transmitting / receiving coil 21 and the second power transmitting / receiving coil 22 between the drill pipes 2, 2 and a loss due to transmission through the line 2c inside the drill pipe 2. However, according to FIG. 3, a transmission efficiency of about -5 dB or more is possible at about 350 kHz.

[0022] In the drill pipe 2B, which is an observation drill pipe, the first power transmitting / receiving coil 21 and the second power transmitting / receiving coil 22 can be connected via a line 2c and an electronic circuit unit 2d. The location and size of the electronic circuit unit 2d in the drill pipe 2B are not limited to the location and size shown in Fig. 2. As shown in Fig. 4, the electronic circuit unit 2d includes a first triplexer 23, a second triplexer 24, a power splitter 25, a charging unit 26, a control signal splitter 27, an observation instrument 28, and an observation signal combiner 29. In Fig. 4, the power supplied by the charging unit 26 is indicated by a dashed line with an arrow, and the flow of other signals, etc. is indicated by a solid line with an arrow.

[0023] The first triplexer 23 transmits the high-frequency power and control signal transmitted from the first transmitting / receiving coil 21 to the power division unit 25 and the control signal division unit 27, respectively, and transmits the combined observation signal transmitted from the observation signal synthesis unit 29 to the first transmitting / receiving coil 21 as an observation signal.

[0024] The first triplexer 23 may be a circuit having elements as shown in Fig. 5. For example, the capacitance elements C1 is 3.1 nF, C2 is 1.1 nF, C3 is 1.1 nF, C4 is 3.1 nF, C5 is 47.8 nF, C6 is 49.4 nF, C7 is 47.8 nF, C8 is 2.0 nF, C9 is 0.87 nF, C10 is 0.87 nF, C11 is 2.0 nF, C12 is 12.4 nF, C13 is 13.2 nF, C14 is 12.4 nF, C15 is 0.91 nF, C16 is 0.28 nF, C17 is 0.28 nF, C18 is 0.91 nF, C19 is 5.9 nF, C20 is 5.5 nF, C21 is 0.91 nF, C22 is 0.91 nF, C23 is 0.91 nF, C24 is 0.91 nF, C25 is 0.91 nF, C26 is 0.91 nF, C27 is 0.91 nF, C28 is 0.91 nF, C29 is 0.91 nF, C30 is 0.91 nF, C31 is 0.91 nF, C32 is 0.91 nF, C33 is 0.91 nF, C34 is 0.91 nF, C35 is 0.91 nF, C36 is 0.91 nF, C37 is 0.91 nF, C38 is 0.91 nF, C39 is 0.91 nF, C40 is 0.91 nF, C41 is 0.91 nF, C42 is 0.9 Assuming that the inductance of the inductor is 5.9 nF, and that the inductor elements L1 are 5 μH, L2 are 14 μH, L3 are 4 μH, L4 are 4 μH, L5 are 4 μH, L6 are 4 μH, L7 are 4 μH, L8 are 4 μH, L9 are 4 μH, L10 are 4 μH, and L11 are 4 μH, then, between the terminals 23A and 23B, between the terminals 23A and 23C, and between the terminals 23A and 23D, the S parameters of the pass characteristics with the center frequencies of about 350 kHz, about 650 kHz, and about 800 kHz, respectively, can be realized as shown by the curves b, c, and d in FIG. 6. The second triplexer 24 can also be a circuit similar to that of the first triplexer 23.

[0025] Therefore, if the frequencies of the high frequency power, control signal and observation signal are 350 kHz, 650 kHz and 800 kHz, respectively, it can be seen that the high frequency power, control signal and observation signal superimposed at terminal 23A can be appropriately separated into high frequency power at terminal 23B, control signal at terminal 23C and observation signal at terminal 23D.

[0026] The power dividing section 25 divides a part of the high frequency power transmitted from the first triplexer 23 and supplies the divided part to the charging section 26, and also transmits the remaining high frequency power to the second triplexer 24.

[0027] The power dividing unit 25 may be a directional coupler. The power dividing unit 25 may be a circuit having elements as shown in FIG. 7. For example, if the capacitance elements C1, C2, C3, and C4 are 181 nF, the inductive elements L1 and L3 are 2.27 μH, L2 and L4 are 2.28 μH, and the resistive element R is 50 Ω, the frequency of the high frequency power is 350 kHz, and about 1 / 100 of the high frequency power input to the terminal 25A is divided and output from the terminal 25B, and the remaining about 99 / 100 is output from the terminal 25C. The ratio of division may be changed by changing the constant of the elements.

[0028] Table 1 below shows the calculated values ​​when one drill pipe 2B is connected to every 100-stage connected drill pipes 2A (transmission distance 1 km). The transmission efficiency of the 100-stage connected drill pipes 2A (transmission distance 1 km) was set to -5 dB based on the data shown in FIG. 3 above. It was assumed that 1000 W of high-frequency power was output from the offshore or land facility (shown as 0 km transmission distance). The length (maximum transmission distance) of the drill pipe multi-stage connection 1 was set to 10 km. The ratio of the power split in the drill pipe 2B and supplied to the charging unit 26 was set to 1 / 100 of the transmitted high-frequency power up to a total transmission distance of 6 km, and was gradually increased by changing the constant of the elements of the power splitting unit 25 at a total transmission distance of 7 km, 8 km, and 9 km. This was to prevent the power split at a total transmission distance of 7 km, 8 km, and 9 km and supplied to the charging unit 26 from becoming too small.

[0029] In Table 1 below, the input high-frequency power is the high-frequency power transmitted to the drill pipe 2B installed every 1 km of transmission distance, the output high-frequency power is the high-frequency power transmitted from the drill pipe 2B, and the divided high-frequency power is the high-frequency power that is divided and supplied to the charging section 26.

[0030] [Table 1]

[0031] According to Table 1, at least about 6.5 mW is ensured at the tip and intermediate points of the drill pipe multi-stage joint 1.

[0032] The charging unit 26 stores a portion of the high-frequency power provided from the power dividing unit 25 .

[0033] Specifically, the charging unit 26 can be composed of an ACDC converter 26a, a DCDC converter 26b, and a rechargeable battery 26c. The ACDC converter 26a rectifies a part of the high frequency power provided from the power splitting unit 25 and converts it into a DC voltage. The DCDC converter 26b converts the DC voltage into a predetermined constant voltage. The rechargeable battery 26c stores power.

[0034] Since the value of the DC voltage from the ACDC converter 26a can vary greatly depending on conditions such as the location where the drill pipe 2B is installed, it is preferable that the DCDC converter 26b has a wide range of possible input voltages and is capable of both stepping down and stepping up.

[0035] The control signal splitter 27 operates by receiving power from the charging unit 26. The control signal splitter 27 splits a part of the control signal transmitted from the first triplexer 23 to control the observation instrument 28, and transmits the remaining control signal to the second triplexer 24. The division of the part of the control signal transmitted from the first triplexer 23 includes a case where the control signal transmitted from the first triplexer 23 is amplified and then the part is split, and a case where the part is split without being amplified. The transmission of the remaining control signal to the second triplexer 24 includes a case where the remaining control signal is amplified and then transmitted to the second triplexer 24, and a case where the remaining control signal is transmitted to the second triplexer 24 without being amplified.

[0036] Specifically, the control signal division section 27 can be configured to include a control signal amplifier 27a, a control signal divider 27b, a control signal demodulator 27c, and a control signal output amplifier 27d.

[0037] The control signal amplifier 27a operates by receiving power from the charging unit 26. The control signal amplifier 27a amplifies the control signal transmitted from the first triplexer 23 to an appropriate amplitude and transmits the amplified control signal to the control signal divider 27b.

[0038] The control signal divider 27b divides a part of the control signal amplified by the control signal amplifier 27a, transmits the divided part to the control signal demodulator 27c, and transmits the remaining control signal to the control signal output amplifier 27d. The control signal divider 27b can use a directional coupler like the power divider 25, and can have a circuit configuration similar to that shown in FIG. 7, although the constants of the elements are different.

[0039] The control signal demodulator 27c operates by receiving power from the charging unit 26. The control signal demodulator 27c demodulates a part of the control signal transmitted from the control signal divider 27b and controls the observation equipment 28.

[0040] As described above, the control signal is transmitted intermittently, but channel information can be added to each unit of intermittent transmission. After demodulation, the control signal demodulator 27c can operate the observation device 28 if the control signal matches its own channel. In this way, when the observation devices 28 are operated at multiple locations in the drill pipe multi-stage connection body 1 to acquire observation signals, it becomes possible to transmit the observation signals corresponding to the multiple observation devices 28 separately on the time axis. The number of channels is not limited.

[0041] The control signal output amplifier 27d operates by receiving power from the charging unit 26. The control signal output amplifier 27d amplifies the power of the remaining control signal transmitted from the control signal divider 27b, and transmits the amplified power to the second triplexer 24.

[0042] In some cases, it is possible to omit either the control signal amplifier 27a or the control signal output amplifier 27d.

[0043] The observation device 28 operates by receiving power from the charging unit 26. The observation device 28 is controlled by the control signal dividing unit 27 and transmits observed information as an internal observation signal to the observation signal combining unit 29. The observation device 28 can be various observation devices that observe the state of the drill pipe multi-stage connection body 1 itself or the surrounding state (for example, various sensors and cameras that observe pressure, temperature, rotation, vibration, etc.).

[0044] The observation signal combiner 29 operates by receiving power from the charging unit 26. The observation signal combiner 29 combines the internal observation signal transmitted from the observation equipment 28 and the observation signal transmitted from the second triplexer 24, and transmits the combined observation signal to the first triplexer 23.

[0045] Specifically, the observation signal combiner 29 can be configured to include an observation signal amplifier 29a, an observation signal modulator 29b, an observation signal combiner 29c, and an observation signal output amplifier 29d.

[0046] The observation signal amplifier 29a operates by receiving power from the charging unit 26. The observation signal amplifier 29a amplifies the observation signal transmitted from the second triplexer 24 to an appropriate amplitude, and transmits the amplified signal to the observation signal combiner 29c.

[0047] The observation signal modulator 29b operates by receiving power from the charging unit 26. The observation signal modulator 29b modulates the internal observation signal transmitted from the observation equipment 28, and transmits the modulated signal to the observation signal combiner 29c.

[0048] The observation signal combiner 29c combines the internal observation signal transmitted from the observation signal modulator 29b with the observation signal amplified by the observation signal amplifier 29a, and transmits the combined observation signal to the observation signal output amplifier 29d.

[0049] The observation signal output amplifier 29d operates by receiving power from the charging unit 26. The observation signal output amplifier 29d amplifies the power of the combined observation signal transmitted from the observation signal combiner 29c, and transmits the amplified signal to the first triplexer .

[0050] In some cases, it is possible to omit either the observation signal amplifier 29a or the observation signal output amplifier 29d.

[0051] The second triplexer 24 transmits the high-frequency power transmitted from the power division unit 25 and the control signal transmitted from the control signal division unit 27 to the second transmitting / receiving coil 22, and transmits the observation signal transmitted from the second transmitting / receiving coil 22 to the observation signal synthesis unit 29.

[0052] In this way, in the drill pipe 2B, the charging unit 26 stores a portion of the high-frequency power that is constantly transmitted and supplies that power to the control signal division unit 27, the observation equipment 28 and the observation signal synthesis unit 29, which operate intermittently, so that the control signal division unit 27, the observation equipment 28 and the observation signal synthesis unit 29, which operate intermittently, can operate properly without suffering from power shortages.

[0053] Therefore, in the drill pipe multi-stage connection body 1, power, control signals, and observation signals can be transmitted non-contact at the joints of the drill pipes 2, and observation equipment 28 can be easily attached at necessary points along the way.

[0054] The above describes a drill pipe multi-stage connection body according to an embodiment of the present invention. However, the present invention is not limited to the above-described embodiment, and various design modifications are possible within the scope of the matters described in the claims. [Explanation of symbols]

[0055] 1 Drill pipe multi-stage joint 2, 2A, 2B Drill pipe 2a Drill pipe body 2aa 1st end 2ab 2nd end 2b Hollow hole 2c track 2d electronic circuit section 21 First power transmitting / receiving coil 22 Second power transmitting / receiving coil 23 First triplexer 24 Second triplexer 25 Power splitter 26 Live parts 26a ACDC converter 26b DCDC converter 26c Rechargeable Battery 27 Control signal division section 27a Control signal amplifier 27b Control signal divider 27c Control signal demodulator 27d Control signal output amplifier 28 Observation Equipment 29 Observation signal synthesis unit 29a Observation signal amplifier 29b Observation signal modulator 29c Observation signal combiner 29d Observation signal output amplifier

Claims

1. A multi-stage drill pipe connection structure in which drill pipes, each having a first power transmitting and receiving coil provided at a first end and a second power transmitting and receiving coil provided at a second end, are connected in multiple stages, and between adjacent drill pipes, high frequency power and a control signal are transmitted from the second power transmitting and receiving coil to the first power transmitting and receiving coil in a non-contact manner, and an observation signal is transmitted from the first power transmitting and receiving coil to the second power transmitting and receiving coil, The drill pipes connected in multiple stages include at least one observation drill pipe, the observation drill pipe includes a first triplexer, a second triplexer, a power splitter, a charging unit, a control signal splitter, an observation instrument, and an observation signal combiner between the first power transmitting / receiving coil and the second power transmitting / receiving coil; the first triplexer transmits the high frequency power and the control signal transmitted from the first power transmitting / receiving coil to the power dividing unit and the control signal dividing unit, respectively, and transmits a combined observation signal transmitted from the observation signal combining unit to the first power transmitting / receiving coil as the observation signal; the power division unit divides a portion of the high frequency power transmitted from the first triplexer, supplies the divided portion to the charging unit, and transmits the remaining high frequency power to the second triplexer; the charging unit charges the portion of the high frequency power provided from the power dividing unit, the control signal division unit receives power from the charging unit, divides a part of the control signal transmitted from the first triplexer to control the observation instrument, and transmits the remaining control signal to the second triplexer; the observation device is supplied with power from the charging unit and controlled by the control signal dividing unit to transmit observed information to the observation signal combining unit as an internal observation signal; the observation signal combiner is supplied with power from the charging unit, combines the internal observation signal transmitted from the observation device with the observation signal transmitted from the second triplexer, and transmits the combined observation signal to the first triplexer; The second triplexer transmits the high frequency power transmitted from the power dividing unit and the control signal transmitted from the control signal dividing unit to the second power transmitting / receiving coil, and transmits the observation signal transmitted from the second power transmitting / receiving coil to the observation signal combining unit.

2. The drill pipe multi-stage connection assembly according to claim 1, the control signal splitting unit includes a control signal amplifier, a control signal splitter, and a control signal demodulator; the control signal amplifier is supplied with power from the charging unit, amplifies the control signal transmitted from the first triplexer, and transmits the amplified control signal to the control signal divider; the control signal divider divides the part of the control signal amplified by the control signal amplifier and transmits the part to the control signal demodulator, and transmits the remaining part of the control signal to the second triplexer; The control signal demodulator is a drill pipe multi-stage connection unit that receives power from the charging unit and demodulates the portion of the control signal transmitted from the control signal divider to control the observation equipment.

3. The drill pipe multi-stage connection assembly according to claim 1, the control signal dividing unit includes a control signal divider, a control signal demodulator, and a control signal output amplifier; the control signal divider divides the part of the control signal transmitted from the first triplexer and transmits the part to the control signal demodulator, and transmits the remaining part of the control signal to the control signal output amplifier; the control signal demodulator is supplied with power from the charging unit, and demodulates the portion of the control signal transmitted from the control signal divider to control the observation equipment; The control signal output amplifier is a drill pipe multi-stage connection unit that receives power from the charging unit, amplifies the remaining control signal transmitted from the control signal divider, and transmits the amplified control signal to the second triplexer.

4. The drill pipe multi-stage connection assembly according to claim 1, the control signal division unit includes a control signal amplifier, a control signal divider, a control signal demodulator, and a control signal output amplifier; the control signal amplifier is supplied with power from the charging unit, amplifies the control signal transmitted from the first triplexer, and transmits the amplified control signal to the control signal divider; the control signal divider divides the part of the control signal amplified by the control signal amplifier and transmits the part to the control signal demodulator, and transmits the remaining part of the control signal to the control signal output amplifier; the control signal demodulator is supplied with power from the charging unit, and demodulates the portion of the control signal transmitted from the control signal divider to control the observation equipment; The control signal output amplifier is a drill pipe multi-stage connection unit that receives power from the charging unit, amplifies the remaining control signal transmitted from the control signal divider, and transmits the amplified control signal to the second triplexer.

5. The drill pipe multi-stage connection body according to any one of claims 1 to 4, the observation signal combiner includes an observation signal amplifier, an observation signal modulator, and an observation signal combiner; the observation signal amplifier is supplied with power from the charging unit, amplifies the observation signal transmitted from the second triplexer, and transmits the amplified observation signal to the observation signal combiner; the observation signal modulator is supplied with power from the charging unit, and modulates the internal observation signal transmitted from the observation device and transmits the modulated internal observation signal to the observation signal combiner; The observation signal combiner is a drill pipe multi-stage connection device that combines the internal observation signal transmitted from the observation signal modulator and the observation signal amplified by the observation signal amplifier, and transmits the combined observation signal to the first triplexer.

6. The drill pipe multi-stage connection body according to any one of claims 1 to 4, the observation signal combiner includes an observation signal modulator, an observation signal combiner, and an observation signal output amplifier; the observation signal modulator is supplied with power from the charging unit, and modulates the internal observation signal transmitted from the observation device and transmits the modulated internal observation signal to the observation signal combiner; the observation signal combiner combines the internal observation signal transmitted from the observation signal modulator and the observation signal transmitted from the second triplexer, and transmits the combined observation signal to the observation signal output amplifier; The observation signal output amplifier is a drill pipe multi-stage connection unit that receives power from the charging unit, amplifies the combined observation signal transmitted from the observation signal combiner, and transmits the amplified combined observation signal to the first triplexer.

7. The drill pipe multi-stage connection body according to any one of claims 1 to 4, the observation signal combiner includes an observation signal amplifier, an observation signal modulator, an observation signal combiner, and an observation signal output amplifier; the observation signal amplifier is supplied with power from the charging unit, amplifies the observation signal transmitted from the second triplexer, and transmits the amplified observation signal to the observation signal combiner; the observation signal modulator is supplied with power from the charging unit, and modulates the internal observation signal transmitted from the observation device and transmits the modulated internal observation signal to the observation signal combiner; the observation signal combiner combines the internal observation signal transmitted from the observation signal modulator with the observation signal amplified by the observation signal amplifier, and transmits the combined observation signal to the observation signal output amplifier; The observation signal output amplifier is a drill pipe multi-stage connection unit that receives power from the charging unit, amplifies the combined observation signal transmitted from the observation signal combiner, and transmits the amplified combined observation signal to the first triplexer.

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