Near-bit passive awakening and dormancy device

Abstract

The utility model discloses a near-bit passive awakening and dormancy device. The near-bit passive awakening and dormancy device comprises a near-bit body circuit arranged on a near-bit body and an independent handheld control box, the near-bit body circuit comprises a processor, a communication circuit, a wake-up circuit and a power management and control module, the communication circuit, the wake-up circuit and the power management and control module are electrically connected with the processor, the communication circuit and the wake-up circuit are electrically connected with an analog selection switch, the analog selection switch is electrically connected with a coupling coil, and the power management and control module is electrically connected with a main battery and an auxiliary battery. And the processor, the communication circuit and the analog selection switch are powered. According to the device disclosed by the utility model, the power consumption management of the instrument is carried out based on the magnetic coupling type antenna, the passive wake-up circuit technology is adopted, all devices are passive devices, an external power supply is not needed, and the circuit structure is simple.

Description

Technical Field

[0001] The utility model belongs to the field of logging while drilling of oil and gas exploration engineering, and particularly relates to a near-drill-bit passive wake-up and sleep device in the field, which is used for power consumption management of near-drill-bit measurement systems while drilling, and can also be used in other fields requiring battery management. Background Art

[0002] In the field of logging while drilling engineering applications, the energy sources of logging while drilling instruments are mainly batteries and turbine generators. For logging while drilling instruments using batteries, such as MWD and near-bit, it is difficult to increase the battery capacity due to structural size limitations. In field applications, the waiting time after the instrument is powered on, the transition time, the wellhead hovering time and other invalid working time are very long, resulting in a lot of waste of electricity. It is inconvenient to disassemble and power off on site, so power consumption management is very helpful in extending the working time of the instrument and shortening the drilling cycle.

[0003] Geological guidance drilling technology will gradually replace directional drilling technology and become the mainstream. In conventional LWD measurement systems, since the geological parameter measurement instrument is located above the screw drill, 10m~15m away from the drill bit, it is difficult to obtain a good geological guidance effect when constructing ultra-thin oil layers. However, the distance between the geological parameter measurement point and the drill bit of the near-drill bit measurement system is within 1m, which can well realize the geological guidance drilling function. The block diagram of the near-drill bit measurement system is shown in the figure. Figure 1 As shown in the figure, the near-bit battery unit mainly uses non-rechargeable lithium batteries. The batteries can generally meet 150 to 200 hours of working time. However, most drilling operations hope that the batteries can work for more than 200 hours. Therefore, good power consumption management and extended battery working time are important technical development directions for near-bit systems.

[0004] There are two main types of antenna systems near the drill bit: magnetically coupled antennas and electrically coupled antennas. Electrically coupled antennas are represented by insulating antennas, and magnetically coupled antennas are mainly inductive coils and spiral loops. Magnetic coupled antennas are physically isolated from the instrument circuit unit, and it is difficult to establish communication with it in sleep mode, which undoubtedly increases the difficulty of designing the wake-up circuit. The existing wake-up circuit technology is mostly active wake-up circuits, which are generally composed of low-power transistors, but transistors are active devices and require external power supply. If this technology is applied to the near-drill bit system, it will undoubtedly increase the complexity of the power system and additional power consumption. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a near-drill-bit passive wake-up and sleep device based on a magnetically coupled antenna to manage the power consumption of the instrument.

[0006] The utility model adopts the following technical solutions:

[0007] A near-drill-bit passive wake-up and sleep device, the improvement of which lies in: comprising a near-drill-bit body circuit arranged on a near-drill-bit body and an independent handheld control box; the near-drill-bit body circuit comprises a processor and a communication circuit electrically connected to the processor, a wake-up circuit and a power management and control module, the communication circuit and the wake-up circuit are electrically connected to an analog selection switch respectively, the analog selection switch is electrically connected to a coupling coil, the power management and control module is electrically connected to a main battery and an auxiliary battery, and supplies power to the processor, the communication circuit and the analog selection switch; the handheld control box comprises a button electrically connected together, an external excitation circuit and an excitation coil.

[0008] Furthermore, the wake-up circuit includes resistors R1, R2, a diode D1, a resistor R3 and a Zener diode D2 connected in series, the resistors R1 and R2 are electrically connected to the coupling coil, and the Zener diode D2 is electrically connected to the wake-up pin of the processor.

[0009] Furthermore, the resistors R1 and R2 are grounded, the resistor R3 and the Zener diode D2 are grounded, and the resistor R4 is connected in parallel with the resistor R3 and the Zener diode D2 and connected to the wake-up pin of the processor.

[0010] Furthermore, the resistor R1=R2=R3=100KΩ, the resistor R4=100Ω, the diode D1 adopts 1N4001, and the voltage regulator diode D2 outputs a regulated voltage of 3V.

[0011] Furthermore, the coupling coil is composed of a group of conducting wires wound around a group of magnetic rings or magnetic rods in a circumferential direction or an axial direction near the drill bit body.

[0012] Furthermore, the excitation coil is two metal antennae, a wire or a magnetic ring.

[0013] Furthermore, the handheld control box also includes an LCD panel.

[0014] A passive awakening and dormancy method near the drill bit, using the above device, has the following improvements:

[0015] The analog selection switch is connected to the communication circuit when the power management and control module is enabled, and is connected to the wake-up circuit when the power management and control module is disabled;

[0016] When the drill bit needs to sleep, the excitation coil of the handheld control box is placed close to the coupling coil of the near-drill-bit body circuit, and the external excitation circuit is controlled by a button to send a sleep signal to the coupling coil through the excitation coil. After the coupling coil receives the sleep signal, it is sent to the communication circuit through the analog selection switch, and the communication circuit amplifies and filters it and then sends it to the processor to analyze the sleep signal. After the processor successfully analyzes the sleep signal, it sends a response signal to the handheld control box, and then cuts off the main battery through the power management and control module, connects the auxiliary battery, and disables the power management and control module, so that the near-drill-bit enters the sleep mode;

[0017] When the near drill bit needs to work, the excitation coil of the handheld control box is placed close to the coupling coil of the near drill bit body circuit, and the external excitation circuit is controlled by a button to generate a wake-up pulse signal through the excitation coil. According to the principle of electromagnetic induction, the coupling coil will induce a pulse signal, which is sent to the wake-up circuit through the analog selection switch, and is sent to the wake-up pin of the processor after passive filtering and shaping by the wake-up circuit. After the processor is awakened, the power management and control module is enabled, so that the power management and control module is connected to the main battery, the auxiliary battery is cut off, and the near drill bit enters the working mode.

[0018] Furthermore, the buttons are operated through the prompts on the LCD panel of the handheld control box.

[0019] Furthermore, the sleep current in sleep mode is 2.2uA.

[0020] The beneficial effects of the utility model are:

[0021] The device disclosed in the utility model manages the power consumption of the instrument based on a magnetically coupled antenna and adopts passive wake-up circuit technology. All of them are passive devices, do not require an external power supply, and have a simple circuit structure. The handheld control box can complete the operation of dormancy and wake-up of the instrument with just one button, which greatly facilitates on-site applications and can effectively extend the working time of the instrument battery. There are three types of wake-up and excitation forms of the handheld control box, which can be flexibly selected according to actual conditions.

[0022] The method disclosed by the utility model can generate a wake-up pulse signal with a voltage of 3V and a pulse width of 4ms by a passive wake-up circuit, which can meet the wake-up work requirements of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a block diagram of the components of the near-drill-bit measurement system;

[0024] Figure 2 It is the overall design block diagram of the device disclosed in the utility model;

[0025] Figure 3 It is a topological diagram of the wake-up circuit in the device disclosed in the utility model;

[0026] Figure 4 It is a schematic diagram of the exciting coil being a wire;

[0027] Figure 5 It is a schematic diagram of the excitation coil being two metal antenna antennas;

[0028] Figure 6 It is a schematic diagram of the excitation coil being a magnetic ring.

[0029] Figure numerals: 1—near-bit body circuit, 11—processor, 12—communication circuit, 13—wake-up circuit, 14—power management and control module, 15—analog selection switch, 16—coupling coil, 17—main battery, 18—auxiliary battery, 2—handheld control box, 21—button, 22—external excitation circuit, 23—excitation coil, 24—LCD panel. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] Embodiment 1, this embodiment discloses a passive wake-up and sleep device near the drill bit, such as Figure 2 As shown, it includes a near-drill-bit body circuit 1 and an independent handheld control box 2 arranged on the near-drill-bit body; the near-drill-bit body circuit includes a processor 11 and a communication circuit 12 electrically connected to the processor, a wake-up circuit 13 and a power management and control module 14, the communication circuit and the wake-up circuit are electrically connected to the analog selection switch 15 respectively, the analog selection switch is electrically connected to the coupling coil 16, the power management and control module is electrically connected to the main battery 17 and the auxiliary battery 18, and supplies power to the processor, the communication circuit and the analog selection switch; the handheld control box includes a button 21, an external excitation circuit 22 and an excitation coil 23 electrically connected together, and also includes an LCD panel 24.

[0032] In this embodiment, the processor adopts the ultra-low power ARM processor MKL25Z128, which is responsible for receiving and processing sleep commands, power management, and control commands of the control module and processing of wake-up pin interrupt signals.

[0033] The power management and control module is responsible for battery current sampling, overcurrent management, shutdown and startup control, etc.

[0034] The communication circuit is responsible for amplifying and filtering the command signals (mainly sleep control commands) received by the coupling coil.

[0035] The wake-up circuit uses passive components to shape and stabilize the signal received by the coupling coil to form a pulse width signal that can be recognized by the processor.

[0036] The analog selection switch is responsible for selecting whether the coupling coil is connected to the communication circuit or the wake-up circuit. When the power management and control module is enabled, the system power is output normally and the analog selection switch is connected to the communication circuit; when the power management and control module is disabled, the system power is turned off and the analog selection switch is connected to the wake-up circuit.

[0037] The coupling coil is an antenna responsible for receiving signals or commands. It is composed of a group of conducting wires wound around a group of magnetic rings or magnetic rods in a circumferential direction or axial direction near the drill bit body.

[0038] The excitation coil is used to transmit the sleep command or wake-up pulse, and it can be in the form of two metal feeler antennas, a wire running through the drill body, or a magnetic ring.

[0039] The external excitation circuit is responsible for providing power, excitation signal, etc. to the excitation coil.

[0040] like Figure 3 As shown, the wake-up circuit is designed with passive components such as resistors, capacitors, and diodes in order to minimize system power consumption. The wake-up circuit includes resistors R1, R2, diode D1, resistor R3, and Zener diode D2 connected in series. The above-mentioned resistors R1 and R2 are electrically connected to the coupling coil L1, and the Zener diode D2 is electrically connected to the wake-up pin IO of the processor. Ground is connected between the resistors R1 and R2, and ground is connected between the resistor R3 and the Zener diode D2. The resistor R4 is connected in parallel with the resistor R3 and the Zener diode D2 and connected to the wake-up pin of the processor.

[0041] The circuit composed of L1, R1 and R2 in series generates an induced current under the action of the induced voltage. The current passes through the diode D1 and forms a pulse voltage of up to 4V at both ends of R3. After voltage stabilization and shaping, it finally forms a high-level 3V pulse signal with a width of 4ms, which is finally sent to the wake-up pin IO of the processor and generates an interrupt signal on the pin.

[0042] In this embodiment, the resistor R1=R2=R3=100KΩ, the resistor R4=100Ω, the diode D1 adopts 1N4001, and the voltage regulator diode D2 outputs a regulated voltage of 3V. The wake-up circuit is simple and reliable, and convenient for practical application. Other circuit parameters can also be used as needed.

[0043] This embodiment also discloses a near-drill-bit passive wake-up and sleep method, using the above-mentioned device, the specific contents are as follows:

[0044] The analog selection switch is connected to the communication circuit when the power management and control module is enabled, and is connected to the wake-up circuit when the power management and control module is disabled;

[0045] When the drill head needs to sleep, open the handheld control box, bring the excitation coil of the handheld control box close to the coupling coil of the drill head body circuit, and according to the prompts on the LCD panel, control the external excitation circuit through the buttons to send a sleep signal (modulated electromagnetic wave signal) to the coupling coil through the excitation coil. After the coupling coil receives the sleep signal, it is sent to the communication circuit through the analog selection switch, and then sent to the processor to analyze the sleep signal after amplification and filtering by the communication circuit. After the processor successfully analyzes the sleep signal (command judgment), it sends a response signal to the handheld control box, and then the processor reconfigures each peripheral module and IO pin for low power consumption, and then cuts off the main battery power supply through the power management and control module, connects the auxiliary battery, and disables the power management and control module, so that the drill head enters the ultra-low power sleep mode. The sleep current in sleep mode is 2.2uA, and the auxiliary battery can work continuously for 5 years at this power consumption.

[0046] When the near drill head needs to work normally, open the handheld control box, bring the excitation coil of the handheld control box close to the coupling coil of the near drill head body circuit, and according to the prompts on the LCD panel, control the external excitation circuit through the excitation coil to generate a wake-up pulse signal. The wake-up pulse signal acts on the coupling coil. According to the principle of electromagnetic induction, the coupling coil will induce a pulse signal, which is sent to the wake-up circuit through the analog selection switch. After passive filtering and shaping by the wake-up circuit, a level signal that meets the processor wake-up requirement is finally formed and sent to the wake-up pin of the processor. After the processor is awakened, each peripheral is initialized again, the power management and control module is enabled, the power management and control module is connected to the main battery for power supply, the auxiliary battery is cut off, and the near drill head enters the normal working mode.

[0047] The handheld control box is used to send sleep signals and wake-up pulse signals to the drill bit. There are three types of excitation:

[0048] Excitation wire form: Figure 4 As shown, an insulated wire is passed through the water hole near the drill bit body, and both ends of the wire are connected to the signal output port of the external excitation circuit of the handheld control box. By pressing the button to select the sleep or wake-up command, the external excitation circuit emits electromagnetic waves or pulse signals to achieve communication with the near drill bit body or wake it up.

[0049] Metal antenna form: Figure 5As shown, two metal antennas are used, and the A ends of the metal antennas are connected to the signal output ports of the external excitation circuit of the handheld control box, and the B ends are firmly in contact with the near-drill body, ensuring that the two B-end contacts are at both ends of the coupling coil. By pressing the button to select the sleep or wake-up command, the external excitation circuit emits electromagnetic waves or pulse signals to achieve communication with the near-drill body or wake it up.

[0050] Magnetic ring form: Figure 6 As shown in the figure, the magnetic ring is composed of a group of wires wound around a specific magnetic core. The magnetic ring is installed inside the handheld control box to form an excitation coil. When in use, the handheld control box is placed close to the coupling coil, and the sleep or wake-up command is selected by pressing the button. The external excitation circuit emits electromagnetic waves or pulse signals to achieve communication with the near-bit body or wake it up.

Claims

1. A passive wake-up and sleep device near the drill bit, characterized in that: It includes a near-drill-bit body circuit arranged on the near-drill-bit body and an independent handheld control box; the near-drill-bit body circuit includes a processor and a communication circuit electrically connected to the processor, a wake-up circuit and a power management and control module, the communication circuit and the wake-up circuit are electrically connected to the analog selection switch respectively, the analog selection switch is electrically connected to the coupling coil, the power management and control module is electrically connected to the main battery and the auxiliary battery, and supplies power to the processor, the communication circuit and the analog selection switch; the handheld control box includes a button, an external excitation circuit and an excitation coil electrically connected together.

2. The passive wake-up and sleep device near the drill bit according to claim 1, characterized in that: The wake-up circuit includes resistors R1, R2, a diode D1, a resistor R3 and a voltage-stabilizing diode D2 connected in series. The resistors R1 and R2 are electrically connected to the coupling coil, and the voltage-stabilizing diode D2 is electrically connected to the wake-up pin of the processor.

3. The passive wake-up and sleep device near the drill bit according to claim 2, characterized in that: The resistors R1 and R2 are connected to ground, the resistor R3 and the Zener diode D2 are connected to ground, and the resistor R4 is connected in parallel with the resistor R3 and the Zener diode D2 and connected to the wake-up pin of the processor.

4. The passive wake-up and sleep device near the drill bit according to claim 3, characterized in that: Resistor R1=R2=R3=100KΩ, resistor R4=100Ω, diode D1 uses 1N4001, and the voltage regulator diode D2 outputs a regulated voltage of 3V.

5. The passive wake-up and sleep device near the drill bit according to claim 1, characterized in that: The coupling coil is composed of a group of conducting wires wound around a group of magnetic rings or magnetic rods in a circumferential direction or an axial direction near the drill bit body.

6. The passive wake-up and sleep device near the drill bit according to claim 1, characterized in that: The excitation coil is two metal antennae, a wire or a magnetic ring.

7. The passive wake-up and sleep device near the drill bit according to claim 1, characterized in that: The handheld control box also includes an LCD panel.

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