Non-contact energy transfer device for drilling while drilling and rotary steering systems

Abstract

This invention discloses a non-contact energy transfer device for drilling while drilling and rotary steering systems, comprising: a primary module for acquiring raw electrical energy and converting it into a first AC square wave voltage; a transformer including a transmitting coil and a receiving coil, which are respectively disposed on an inner magnetic cylinder and an outer magnetic cylinder within the drill collar; the transformer, through the coupling effect of the inner and outer magnetic cylinders, transmits the first AC square wave voltage acquired by the transmitting coil to the receiving coil to form a second AC square wave voltage; and a secondary module connected to the receiving coil for rectifying the second AC square wave voltage to obtain an output DC voltage, which is then used to power the rotating sub connected to the secondary module. This invention achieves non-contact energy transfer between rotating and non-rotating parts during drilling.

Description

Technical Field

[0001] This invention relates to the field of electrical power transmission technology for drilling systems, and in particular to a non-contact energy transmission device for drilling and rotary steering systems. Background Technology

[0002] Drilling while drilling (DWD) systems, as high-tech drilling systems in the petroleum industry, represent a technology that is not yet fully mastered in the field. They are high-end instruments and equipment integrating multiple disciplines such as oil drilling, mechanical design, and electrical development. Electrical development includes technologies such as circuit design, data transmission, and automatic control. The non-contact power transmission components of DWD systems, both rotating and non-rotating, face significant challenges in power transmission, particularly between drill collars.

[0003] Traditional power transmission methods rely on contact slip rings. However, due to the unique high-temperature and high-pressure environment of drilling operations downhole, contact slip rings suffer from drawbacks such as inconvenient installation, easy wear during rotation, susceptibility to corrosion from drilling fluids, water, and mud, and the inability to connect electrical wires between drill collars. These issues highlight the urgent need for a new power transmission method. Non-contact power transmission has become a key factor in solving this problem and has been a hot research topic for researchers. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a non-contact energy transmission device for drilling while drilling and rotary steering systems, comprising: a primary module for acquiring raw electrical energy and converting it into a first AC square wave voltage; a transformer including a transmitting coil and a receiving coil, the transmitting coil and the receiving coil being respectively disposed on an inner magnetic cylinder and an outer magnetic cylinder within the drill collar, the transformer transmitting the first AC square wave voltage acquired by the transmitting coil to the receiving coil through the coupling effect of the inner and outer magnetic cylinders, forming a second AC square wave voltage; and a secondary module connected to the receiving coil for rectifying the second AC square wave voltage to obtain an output DC voltage, which is then used to power a rotating sub connected to the secondary module.

[0005] Preferably, the primary module includes: a first rectifier circuit for rectifying the original electrical energy to obtain a first direct current; and a first inverter circuit connected to the output terminal of the first rectifier circuit for inverting the first direct current voltage under the control of a first driving square wave voltage and a second driving square wave voltage to obtain a first alternating current square wave voltage.

[0006] Preferably, the primary module further includes a buffer circuit for conditioning the first AC square wave voltage.

[0007] Preferably, the first inverter circuit includes: a first power switch, the gate of which is connected to the first driving square wave voltage, the source of which is connected to the first end of the transmitting coil, and the drain of which is connected to ground, wherein the second end of the transmitting coil is connected to the power supply signal terminal of the first DC voltage; and a second power switch, the gate of which is connected to the second driving square wave voltage, the source of which is connected to the third end of the transmitting coil, and the drain of which is connected to ground.

[0008] Preferably, the buffer circuit includes: a first capacitor connected between the source and drain terminals of the first power switch; and a second capacitor connected between the source and drain terminals of the second power switch.

[0009] Preferably, the primary module further includes a pulse generator for generating the raw electrical energy.

[0010] Preferably, the secondary module includes a second rectifier circuit connected to the receiving coil, wherein the second rectifier circuit includes: a first diode, the anode of which is connected to a first output terminal of the receiving coil; a second diode, the anode of which is connected to a second output terminal of the receiving coil, wherein the cathode of the second diode is connected to the cathode of the first diode and forms a first output terminal of the transmission device at the connection point; a third diode, the cathode of which is connected to the first output terminal of the receiving coil; and a fourth diode, the cathode of which is connected to the second output terminal of the receiving coil, wherein the anode of the fourth diode is connected to the anode of the third diode and forms a second output terminal of the transmission device at the connection point.

[0011] Preferably, the secondary module further includes a third capacitor, which is connected to the first output terminal and the second output terminal of the transmission device, for filtering the output DC voltage.

[0012] Preferably, the secondary module further includes a system load connected to the first output terminal and the second output terminal of the transmission device, used to simulate the load requiring power supply within the rotating guide section using a capacitor, wherein the load requiring power supply includes the circuit board and wing rib motor within the rotating guide section.

[0013] Preferably, the frequency range of the first AC square wave voltage is 20kHz to 100kHz.

[0014] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0015] This invention proposes a non-contact energy transfer device for drilling and rotary steerable systems. The device comprises three parts: a primary circuit, a coupling transformer, and a secondary circuit. The primary circuit includes a pulse generator, a rectifier circuit, a high-frequency inverter circuit, and a buffer circuit; the coupling transformer includes a transmitting coil and a receiving coil; and the secondary circuit includes rectification and a load. First, the pulse generator in the downhole primary circuit generates raw AC power. The rectifier section of the primary circuit converts the AC power to DC power, the high-frequency inverter circuit converts the DC power to AC power, and the buffer circuit absorbs voltage spikes, resulting in good transient response of the primary circuit's transmitted waveform. The coupling transformer primarily transfers power from the inner cylinder to the outer cylinder of the rotary steerable system, achieving non-contact power transfer. The rectifier circuit in the secondary circuit converts AC voltage to DC voltage, providing the entire power supply for the subsequent load. Load losses are mainly due to the circuit board and the three ribs. Non-contact power transfer primarily realizes the conversion and transmission of power while drilling, providing a continuous source of power and data for the entire drilling system. It also handles data transmission between the inner and outer cylinders, making it a crucial and core component of the entire drilling process.

[0016] Therefore, this invention realizes non-contact power transmission between rotating and non-rotating parts for non-contact power transmission while drilling. For non-contact transmission of rotary guides, the latest switching power supply technology is used, which not only has the characteristics of high power, large current, wide frequency range and high steepness, but also analyzes and demonstrates the key issues of power transmission efficiency and voltage spike suppression, and gives corresponding conclusions. This breakthrough in non-contact transmission of rotary guides marks a significant advancement and plays a very important role in the key technologies of rotary guides.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application.

[0021] Figure 3 This is a physical diagram of the circuit board of the first inverter circuit in a non-contact energy transmission device for drilling and rotary steering systems according to an embodiment of this application.

[0022] Figure 4 This is a detailed circuit diagram of the first inverter circuit and transformer in a non-contact energy transmission device for drilling and rotary steering systems according to an embodiment of this application.

[0023] Figure 5 This is an example of the waveforms of the input and output voltages of the first inverter circuit in a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application.

[0024] Figure 6 This is a rectifier circuit diagram of the secondary module in a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application.

[0025] Figure 7 This is an example of a sinusoidal waveform signal diagram of the input and output signals of the second transformer in a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that, as long as there is no conflict, the various embodiments and features in the various embodiments of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0027] Drilling while drilling (DWD) systems, as high-tech drilling systems in the petroleum industry, represent a technology that is not yet fully mastered in the field. They are high-end instruments and equipment integrating multiple disciplines such as oil drilling, mechanical design, and electrical development. Electrical development includes technologies such as circuit design, data transmission, and automatic control. The non-contact power transmission components of DWD systems, both rotating and non-rotating, face significant challenges in power transmission, particularly between drill collars.

[0028] Traditional power transmission methods rely on contact slip rings. However, due to the unique high-temperature and high-pressure environment of drilling operations downhole, contact slip rings suffer from drawbacks such as inconvenient installation, easy wear during rotation, susceptibility to corrosion from drilling fluids, water, and mud, and the inability to connect electrical wires between drill collars. These issues highlight the urgent need for a new power transmission method. Non-contact power transmission has become a key factor in solving this problem and has been a hot research topic for researchers.

[0029] Therefore, to solve the above-mentioned technical problems, this invention proposes a non-contact energy transmission device for drilling while drilling and rotary steering systems. The device includes a primary circuit (primary module), a transformer, and a secondary circuit (secondary module). The primary circuit converts the obtained raw AC power into AC square wave power. The transformer includes a transmitting coil and a receiving coil located on the inner and outer magnetic cylinders of the drill collar assembly, respectively. Through electromagnetic coupling between the inner and outer magnetic cylinders, the AC square wave power obtained by the transmitting coil is transferred from the inner cylinder to the outer cylinder. The secondary circuit rectifies the AC square wave power obtained from the receiving coil to generate DC voltage energy, providing the necessary power and data for the circuit boards and ribs within the rotating sub of the drilling while drilling system.

[0030] Thus, the energy transmission device provided by this invention enables non-contact energy transmission between non-rotating and rotating subs within a drilling system, providing a continuous power supply to the entire system while simultaneously transmitting data between the inner and outer cylinders. The non-contact transmission scheme in this invention boasts high reliability, not only providing power transmission for rotary steerable systems but also serving as a common module (CBB) for non-contact power transmission for high-end instruments such as downhole measurement while drilling (MWD) and logging while drilling (LWD), thus enabling upgrades and replacements in drilling technology.

[0031] Before describing the non-contact energy transfer system (hereinafter referred to as the "energy transfer system") of this invention, the application environment of the energy transfer system of this invention will be described first. The energy transfer system of this invention is applied to drilling while drilling and rotary steerable systems. In practical applications, the drilling while drilling and rotary steerable system includes at least a rotating sub (e.g., a rotary steerable sub), a non-rotating sub (e.g., a sub with a drilling measurement instrument), and a drill collar device for connecting the rotating sub and the non-rotating sub. The rotary steerable sub includes the drill string, the rotary steerable system, and mechanical components for controlling the rotation of the drill string.

[0032] Figure 1 This is a schematic diagram of the overall structure of a non-contact energy transfer device for drilling while drilling and rotary steering systems, according to an embodiment of this application. Figure 1 As shown, the non-contact energy transmission system (hereinafter referred to as "energy transmission system") of the present invention includes at least: a primary module (primary circuit) 10, a transformer 20, and a secondary module (secondary circuit) 30.

[0033] The primary module 10, located within the non-rotating short circuit, is used to acquire raw electrical energy and convert it into a first AC square wave voltage. This first AC square wave voltage is a high-frequency AC square wave voltage. Furthermore, the frequency range of the first AC square wave voltage is 20kHz to 100kHz. It should be noted that, in this embodiment of the invention, the raw electrical energy is the power supply energy provided to the system load (the internal equipment within the rotating short circuit).

[0034] Transformer 20 is connected to primary module 10 and specifically includes transmitting coil 21 and receiving coil 22. Transmitting coil 21 is connected to the output terminal of primary module 10 and is wound around the inner magnetic cylinder of the drill collar assembly (in the drilling system). Receiving coil 22 is wound around the outer magnetic cylinder of the drill collar assembly. Transformer 20 is used to transmit the first AC square wave voltage obtained from transmitting coil 21 to receiving coil 22 through the electromagnetic coupling between the inner and outer magnetic cylinders, and to form a second AC square wave voltage at receiving coil 22.

[0035] Secondary module 30 is connected to the output terminal of receiving coil 22. Secondary module 10 is used to rectify the second AC square wave voltage obtained from receiving coil 22 to obtain an output DC voltage, so as to provide the required electrical energy and data and command information to the rotating sub-joint connected to secondary module 30 using the output DC voltage.

[0036] Figure 2 This is a schematic diagram of a non-contact energy transfer device for drilling while drilling and rotary steering systems according to an embodiment of this application. The following is in conjunction with... Figure 1 and Figure 2 The specific internal structure of the energy transmission device described in the embodiments of the present invention will be explained.

[0037] Specifically, in this embodiment of the invention, the initial module 10 includes at least a first rectifier circuit 11 and a first inverter circuit 12. The first rectifier circuit 11 is used to input raw electrical energy and rectify the obtained raw electrical energy to obtain a first DC voltage. The input terminal of the first inverter circuit 12 is connected to the output terminal of the first rectifier circuit 12. The first inverter circuit 12 is a high-frequency inverter circuit. Under the control of a first driving square wave voltage and a second driving square wave voltage, the first inverter circuit 12 is used to invert the first DC power input from the first rectifier circuit 11 to obtain the aforementioned first AC square wave voltage.

[0038] Furthermore, the first and second driving square wave voltages are provided by an external square wave generator. The first driving square wave voltage is a square wave signal with a 1:1 duty cycle at preset fixed intervals. The second driving square wave voltage is a square wave signal with the same waveform as the first driving square wave voltage signal but a 180° phase difference (i.e., the first and second driving square wave signals are a pair of complementary PWM signals). For example, the signal frequencies of the first and second driving square wave voltages are around 20kHz.

[0039] refer to Figure 2 The initial module 10 also includes a pulse generator 11 and a buffer circuit 14. The pulse generator 11 generates the aforementioned raw electrical energy. Because the high-frequency inverter circuit output has voltage spikes and low current switching jitter, the buffer circuit 14 is used to condition the first AC square wave voltage output by the first inverter circuit 12, suppressing the square wave voltage spikes caused by the switching off of the internal switching devices of the high-frequency inverter circuit, thus enabling the primary circuit to emit a square wave voltage with better transient waveform.

[0040] Thus, the primary circuit described in the embodiments of the present invention (reference) Figure 3 , Figure 3 The diagram shows the circuit board of the first inverter circuit in the non-contact energy transmission device for drilling and rotary steering systems according to an embodiment of this application. The device first generates AC voltage from a downhole pulse generator, which is then converted into DC voltage by a rectifier circuit. The high-frequency inverter circuit converts the DC voltage into AC square wave voltage, and a buffer circuit suppresses the square wave voltage spikes caused by the switching of the high-frequency inverter circuit's switching transistor. This allows the primary circuit to emit a square wave voltage with better transient waveform, further improving the energy transmission efficiency and preparing for high-power non-contact energy transmission.

[0041] Figure 4 This is a detailed circuit diagram of the first inverter circuit and transformer in a non-contact energy transfer device for drilling while drilling and rotary steering systems, according to an embodiment of this application. Figure 4 As shown, the first inverter circuit 12 includes: a first power switch Q1 and a second power switch Q2.

[0042] refer to Figure 4 T1 is transformer 20. The left coil of transformer 20 is the transmitting coil 21, which has three leads (1, 2, 3). The first and third leads are the two side leads of the transmitting coil 21, respectively, and the second lead is located at the center tap of the transmitting coil 21. The right coil of transformer 20 is the receiving coil 22. Corresponding output terminals are formed on both sides of the receiving coil 22, and interfaces J2 are configured at both output terminals to connect the receiving coil 22 to the secondary circuit.

[0043] The first power switch Q1 is a MOSFET. The gate (G) of the first power switch Q1 is connected to the first driving square wave voltage, the source (S) of the first power switch Q1 is connected to the first terminal (pin 1) of the transmitting coil 21, and the drain (D) of the first power switch Q1 is connected to ground. The second terminal (pin 2) of the transmitting coil 21 is connected to the power signal terminal of the first DC voltage. The first DC voltage is connected to the first inverter circuit 12 via interface J1. The first rectifier circuit 11 and the first inverter circuit 12 are connected through interface J1. The second power switch Q2 is also a MOSFET. The gate (G) of the second power switch Q2 is connected to the second driving square wave voltage, the source (S) of the second power switch Q2 is connected to the third terminal (pin 3) of the transmitting coil 21, and the drain (D) of the second power switch Q2 is connected to ground.

[0044] In this embodiment of the invention, transformer 20 is a step-up transformer. The transmitting coil 21 forms two coils: a first transmitting coil (formed by pins 1 and 2) and a second transmitting coil (formed by pins 2 and 3), with the number of turns in both coils being the same. The potential obtained at pin 2 is higher than that at pin 1, and the potential obtained at pin 2 is higher than that at pin 3. The receiving coil 22 has a greater number of turns than both the first and second transmitting coils. For example, the number of turns in the receiving coil 22 is five times the number of turns in the first transmitting coil.

[0045] Thus, by controlling the switching devices in the first inverter circuit to alternately turn on and off under the control of complementary signal pairs (first driving square wave voltage and second driving square wave voltage), a first transmitting circuit flowing from pin 2 to pin 1 and a second transmitting circuit flowing from pin 2 to pin 3 are alternately formed at the transmitting coil 21. The transmitting coil of the coupling transformer receives the high-frequency voltage square wave from the primary circuit. The transmitting coil is wound on the inner magnetic cylinder, and the receiving coil is wound on the outer magnetic cylinder. The magnetic cylinder and the coil use electromagnetic coupling to achieve non-contact power transmission. Finally, the receiving coil emits a high-frequency AC square wave voltage (i.e., the second AC square wave voltage).

[0046] Further, refer to Figure 4 In one embodiment of the buffer circuit 14, the buffer circuit 14 includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected between the source and drain terminals of the first power switch Q1; the second capacitor C2 is connected between the source and drain terminals of the second power switch Q2.

[0047] Figure 5 This is an example of a waveform diagram of the input and output voltage of the first inverter circuit in a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application. Figure 5 As shown, the input voltage in the upper part represents the first AC square wave voltage after conditioning, and the output voltage in the lower part represents the second AC square wave voltage after boosting.

[0048] Figure 6 This is a rectifier circuit diagram of the secondary module in a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application. The following is in conjunction with... Figure 2 and Figure 6 The internal structure of the secondary circuit in the embodiments of the present invention will be described. For example... Figure 6 As shown, the secondary module 30 in this embodiment of the invention includes at least a second rectifier circuit 31 and a system load 32.

[0049] like Figure 6 As shown, the second rectifier circuit 31 is connected to the receiving coil 22 via the aforementioned interface J2. The second rectifier circuit 31 is used to rectify the second AC square wave voltage obtained from the receiving coil 22 and output a corresponding DC power supply. The second rectifier circuit 31 includes at least: a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. Specifically, the anode of the first diode D1 is connected to the first output terminal of the receiving coil 22; the anode of the second diode D2 is connected to the second output terminal of the receiving coil 22; the cathode of the third diode D3 is connected to the first output terminal of the receiving coil 22; and the cathode of the fourth diode D4 is connected to the second output terminal of the receiving coil 22. The cathode of the second diode D2 is connected to the cathode of the first diode D1, and a first output terminal of the transmission device is formed at the direct connection point between the second diode D2 and the first diode D1. Simultaneously, the anode of the fourth diode D4 is connected to the anode of the third diode D3, and a second output terminal of the transmission device is formed at the direct connection point between the fourth diode D4 and the third diode D3.

[0050] Furthermore, system load 32 is connected across the first output terminal and the second output terminal of the transmission device. System load 32 is used to simulate the load requiring power supply within the rotating section using a capacitor (R1). The load requiring power supply within the rotating section includes, but is not limited to: the circuit board within the rotating section, and several sets of wing-rib motors (e.g., three wing-rib motors).

[0051] In addition, such as Figure 6As shown, the secondary module 30 in this embodiment of the invention further includes a third capacitor C3. The third capacitor C3 is connected to the first output terminal and the second output terminal of the transmission device (the third capacitor C3 is connected across the first output terminal and the second output terminal of the transmission device). The third capacitor C3 is used to filter the output DC voltage of the second rectifier circuit 31 that is to be input to the system load.

[0052] Thus, the secondary circuit receives the high-frequency AC square wave voltage output from the coupling transformer. The rectifier circuit of the secondary circuit converts the high-frequency AC square wave voltage into DC voltage, which ultimately powers the circuit board and wing motor equipment within the system load. The wing motor equipment consists of three sets of wing motors.

[0053] Furthermore, in this embodiment of the invention, the energy transmission device also includes a second transformer 40 (not shown). The second transformer 40 also includes a transmitting coil 41 and a receiving coil 42. The transmitting coil 41 is wound around the inner magnetic cylinder of the drill collar assembly (within the drilling system), and the receiving coil 42 is wound around the outer magnetic cylinder of the drill collar assembly. Specifically, the transmitting coil 41 is used to directly receive system AC signals provided by external devices and output system AC signals. The receiving coil 42 is used to obtain the coupled system AC signals under the electromagnetic coupling between the inner and outer magnetic cylinders and generate corresponding communication AC signals at the receiving coil 22, so as to directly transmit the currently output communication AC signals to the relevant controlled equipment within the system load, thereby realizing non-contact information transmission of control information, data, and commands for the rotary steering system. The system AC signals are data, signals, and commands provided to the system load for realizing functions such as rotation, guidance, measurement, and control. The second transformer 40 is a step-up transformer.

[0054] Figure 7 This is an example of a sinusoidal waveform signal diagram of the input and output signals of the second transformer in a non-contact energy transfer device for drilling and rotary steering systems according to an embodiment of this application. Figure 7 As shown, the input signal in the upper part represents the AC (sine wave) input signal input to the second transformer, and the output signal in the upper part represents the AC (sine wave) output signal after voltage boosting.

[0055] This invention proposes a non-contact energy transfer device for drilling and rotary steering systems. The device comprises three parts: a primary circuit, a coupling transformer, and a secondary circuit. The primary circuit includes a pulse generator, a rectifier circuit, a high-frequency inverter circuit, and a buffer circuit; the coupling transformer includes a transmitting coil and a receiving coil; and the secondary circuit includes rectification and a load. First, the pulse generator in the downhole primary circuit generates raw AC power. The rectifier section of the primary circuit converts the AC power into DC power, the high-frequency inverter circuit converts the DC power into AC power, and the buffer circuit absorbs voltage spikes, resulting in good transient response of the primary circuit's transmitted waveform. The coupling transformer primarily transfers power from the inner cylinder to the outer cylinder of the rotary steering system, achieving non-contact power transfer. The rectifier circuit in the secondary circuit converts AC voltage to DC voltage, providing the entire power supply for the subsequent load. Load losses are mainly due to the circuit board and the three ribs. Non-contact power transfer primarily realizes the conversion and transmission of power while drilling, providing a continuous source of power and data for the entire drilling system. It also handles data transmission between the inner and outer cylinders, making it a crucial and core component of the entire drilling process.

[0056] Therefore, this invention realizes non-contact power transmission between rotating and non-rotating parts for non-contact power transmission while drilling. For non-contact transmission of rotary guides, the latest switching power supply technology is used, which not only has the characteristics of high power, large current, wide frequency range and high steepness, but also analyzes and demonstrates the key issues of power transmission efficiency and voltage spike suppression, and gives corresponding conclusions. This breakthrough in non-contact transmission of rotary guides marks a significant advancement and plays a very important role in the key technologies of rotary guides.

[0057] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0058] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0059] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0060] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A non-contact energy transfer device for a drilling while drilling system, comprising: A primary module is used to acquire raw electrical energy and convert the raw electrical energy into a first AC square wave voltage; A transformer with a center tap includes a transmitting coil and a receiving coil, which are respectively disposed on an inner magnetic cylinder and an outer magnetic cylinder inside a drill collar. The transformer transmits the first AC square wave voltage obtained by the transmitting coil to the receiving coil through the coupling effect of the inner and outer magnetic cylinders to form a second AC square wave voltage. The secondary module, connected to the receiving coil, is used to rectify the second AC square wave voltage to obtain an output DC voltage, which is then used to power the rotating sub-joint connected to the secondary module. The primary module includes: A first rectifier circuit is used to rectify the original electrical energy to obtain a first direct current. The first inverter circuit is connected to the output terminal of the first rectifier circuit and is used to invert the first DC power under the control of the first driving square wave voltage and the second driving square wave voltage to obtain the first AC square wave voltage. A buffer circuit is used to condition the first AC square wave voltage to suppress the square wave voltage spikes caused by the switching off of the internal switching devices of the first inverter circuit. The first inverter circuit includes: A first power switch transistor, wherein the gate terminal of the first power switch transistor is connected to the first driving square wave voltage, the source terminal of the first power switch transistor is connected to the first terminal of the transmitting coil, and the drain terminal of the first power switch transistor is connected to ground, wherein the second terminal of the transmitting coil is connected to the power supply signal terminal of the first DC power supply. The second power switch has its gate connected to the second driving square wave voltage, its source connected to the third terminal of the transmitting coil, and its drain connected to ground.

2. The non-contact energy transfer device according to claim 1, characterized in that, The buffer circuit includes: A first capacitor is connected across the source and drain terminals of the first power switch. The second capacitor is connected between the source and drain terminals of the second power switch.

3. The non-contact energy transfer device according to claim 1, characterized in that, The primary module also includes: A pulse generator, which is used to generate the raw electrical energy.

4. The non-contact energy transfer device according to claim 1, characterized in that, The secondary module includes a second rectifier circuit connected to the receiving coil, wherein the second rectifier circuit includes: The anode of the first diode is connected to the first output terminal of the receiving coil; The anode of the second diode is connected to the second output terminal of the receiving coil, wherein the cathode of the second diode is connected to the cathode of the first diode and forms the first output terminal of the transmission device at the connection point; The cathode of the third diode is connected to the first output terminal of the receiving coil. The fourth diode has its cathode connected to the second output terminal of the receiving coil, wherein the anode of the fourth diode is connected to the anode of the third diode and forms the second output terminal of the transmission device at the connection point.

5. The non-contact energy transfer device according to claim 4, characterized in that, The secondary module also includes: The third capacitor is connected to the first output terminal and the second output terminal of the transmission device and is used to filter the output DC voltage.

6. The non-contact energy transfer device according to claim 5, characterized in that, The secondary module also includes: The system load, which is connected to the first output terminal and the second output terminal of the transmission device, is used to simulate the load requiring power supply within the rotating section using a capacitor. The load requiring power supply includes the circuit board and rib motor within the rotating guide section.

7. The non-contact energy transfer device according to any one of claims 1 to 6, characterized in that, The frequency range of the first AC square wave voltage is 20kHz to 100kHz.

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