AU2020202877B1 - While-drilling downhole single core bus circuit apparatus - Google Patents
While-drilling downhole single core bus circuit apparatus Download PDFInfo
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- AU2020202877B1 AU2020202877B1 AU2020202877A AU2020202877A AU2020202877B1 AU 2020202877 B1 AU2020202877 B1 AU 2020202877B1 AU 2020202877 A AU2020202877 A AU 2020202877A AU 2020202877 A AU2020202877 A AU 2020202877A AU 2020202877 B1 AU2020202877 B1 AU 2020202877B1
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- 238000005553 drilling Methods 0.000 title claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 230000008878 coupling Effects 0.000 claims description 29
- 238000010168 coupling process Methods 0.000 claims description 29
- 238000005859 coupling reaction Methods 0.000 claims description 29
- 239000004020 conductor Substances 0.000 claims description 9
- 230000035699 permeability Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 21
- 230000008054 signal transmission Effects 0.000 description 8
- 238000009533 lab test Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
- G01V11/002—Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
- G08C19/04—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage using variable resistance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/546—Combination of signalling, telemetering, protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5475—Systems for power line communications adapted for drill or well combined with data transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5483—Systems for power line communications using coupling circuits
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Geochemistry & Mineralogy (AREA)
- Dc Digital Transmission (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention belongs to a technical field of downhole communication of an oil and gas
exploration while-drilling system, and particularly discloses a while-drilling downhole single core
bus circuit apparatus, including: a central control unit, an instrument terminal unit and a single
core bus; the instrument terminal unit being used for forwarding a measured stratum parameter
and converting the stratum parameter into electrical signals and sending the stratum parameter
information to the central control unit; the central control unit being used for forwarding the
stratum parameter information to the surface and sending a central control command to the
instrument terminal unit; the single core bus being electrically connected with the central control
unit and the instrument terminal unit respectively to realize data exchange between the central
control unit and the instrument terminal unit; a terminal resistor being arranged on the single core
bus, and a resistance value of the terminal resistor being a characteristic impedance of the single
core bus. An anti-interference capability of the line and a transmission quality of the line are
improved.
Description
Technical Field The invention relates to a technical field of downhole communication of an oil and gas exploration while-drilling system, in particular to a while-drilling downhole single core bus circuit apparatus.
Background Art In the fields of geological exploration, oilfield development and so on, well logging technology is usually used, which is to measure the physical parameters of the stratum with various instruments and carry out geological research and so on. In order to obtain the stratum parameters closest to those of the original state, while-drilling logging is mostly adopted at present. A while-drilling logging instrument is placed near a drill bit, the obtained stratum parameters are the parameters of the stratum just drilled, which are closest to those of the original state of the stratum. The physical parameters of stratum rock measured during drilling are transmitted to the surface in real time by a data telemetry system for processing. Since the environment is bad, such as the temperature is very high, the pressure is very large and the vibration is strong in the drilling process of the drill bit, the current while-drilling downhole measurement system generally has the problems of high power consumption, poor bus carrying capacity, weak anti-interference capability and the like.
Summary of the Invention Therefore, the invention aims to provide a while-drilling downhole single core bus circuit apparatus and aims to solve the problems of high power consumption, poor bus carrying capacity and weak anti-interference capability of a while-drilling downhole measurement system in the prior art. In order to achieve the above object, the technical solution adopted by the invention is as follows:
a while-drilling downhole single core bus circuit apparatus, characterized by including: a central
control unit, an instrument terminal unit and a single core bus;
the instrument terminal unit being used for forwarding a measured stratum parameter and
converting the stratum parameter into stratum parameter information and sending the stratum
parameter information to the central control unit; the central control unit being used for forwarding the stratum parameter information to the surface and sending a central control command to the instrument terminal unit; the single core bus being electrically connected with the central control unit and the instrument terminal unit respectively to realize data exchange between the central control unit and the instrument terminal unit; a terminal resistor being arranged on the single core bus, and a resistance value of the terminal resistor being a characteristic impedance of the single core bus.
Further, the characteristic impedance of the single core bus satisfies the following equation:
Lo = 27" In b.
Int
zo = in
wherein a is a diameter of a transmission line inner conductor of the single core bus, b is a diameter of a transmission line outer conductor of the single core bus, Lo is an inductance per unit length of the single core bus, p is permeability, 7c is the circular constant, I is a length of conductor, n is a number of coil turns, Co is capacitance per unit length of the single core bus, Zo is the characteristic impedance, and e is a dielectric constant. Further including a bus instrument end communicatively connected with the single core bus and the instrument terminal unit, respectively.
Further, the central control unit includes a communication module, a programmable logic device
and a coupling transformer, and the communication module is electrically connected with the
programmable logic device and the coupling transformer respectively;
the coupling transformer being used for coupling the stratum parameter information or the central
control command to the single core bus;
the communication module being used for receiving and/or sending the stratum parameter
information or the central control command; and
the programmable logic device being electrically connected with the communication module and used for carrying out channel coding and decoding on the received stratum parameter information. Further, a center tap voltage of the coupling transformer is half a supply voltage of the communication module.
Further, the programmable logic device is a field programmable gate array device or a complex programmable logic device. Further, a manner of the channel coding and decoding is one of Manchester coding or differential Manchester coding. Further, the communication module is an RS-485 chip or a CAN chip. Compared with the prior art, the invention has the following beneficial effects: On one hand, the communication between the central control unit and the instrument terminal unit is carried out through the single core bus, two functions of bus signal transmission and bus power supply are simultaneously realized through the single core bus, the circuit structure of the while-drilling downhole single core bus circuit apparatus is simplified, and the anti-interference capability is improved. On the other hand, due to the fact that a terminal resistor is arranged on the single core bus, emission and transmission of signals without a reflection can be realized, and a resistance value of the terminal resistor is set as a characteristic impedance of the single core bus, which means that reflection of signals in the bus caused by medium impedance mismatch can be reduced. The influence of distribution parameters of a transmission medium on the signals is reduced, the transmission distance of the signals is increased, and the signal transmission quality is improved. The influence of the length and characteristic impedance of a signal transmission medium and the architecture of a network bus on the transmission quality of signals is reduced. The anti-interference capability of the while-drilling downhole single core bus circuit apparatus is further improved.
Brief Description of the Drawings In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings, which are referred to in the embodiments or prior arts, will now be briefly described. It is obvious that the drawings in the following description are only some embodiments of the invention, and that those skilled in the art can obtain other drawings from these drawings without involving any inventive effort FIG.1 is a system diagram of a downhole single core bus provided by the present invention; FIG. 2 is a structural diagram of a while-drilling single core bus circuit provided by the present invention; FIG. 3 is a circuit diagram of a laboratory test provided by the present invention; FIG. 4 is a waveform diagram provided by the present invention after data OxOO sent to the bus is coded;
FIG. 5 is a signal diagram at a receiving end of the transformer sending dataOxOO on the bus provided by the present invention; FIG. 6 is a waveform diagram of an output signal of the communication module at the receiving end provided by the present invention; FIG. 7 is a schematic diagram of the output signal of the communication module at the receiving end provided by the present invention.
Detailed Description of the Invention Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to be illustrative of the invention and are not to be construed as limiting the invention. As shown in FIGs. I and 2, the embodiment of the invention provides a while-drilling downhole single core bus circuit apparatus, which includes: a central control unit, an instrument terminal unit and a single core bus; the instrument terminal unit being used for forwarding a measured stratum parameter and converting the stratum parameter into stratum parameter information and sending the stratum parameter information to the central control unit; the central control unit being used for forwarding the stratum parameter information to the surface and sending a central control command to the instrument terminal unit; the single core bus being electrically connected with the central control unit and the instrument terminal unit respectively to realize data exchange between the central control unit and the instrument terminal unit; a terminal resistor being arranged on the single core bus, and a resistance value of the terminal resistor being a characteristic impedance of the single core bus. According to the embodiment of the invention, on one hand, the communication between the central control unit and the instrument terminal unit is carried out through the single core bus, and two functions of bus signal transmission and bus power supply are simultaneously realized through the single core bus, so that the circuit structure of the while-drilling downhole single core bus circuit apparatus is simplified, and the anti-interference capability thereof is improved. According to the embodiment of the invention, on the other hand, by arranging a terminal resistor on the single core bus, the signal can be emitted and transmitted without reflection, and the resistance value of the terminal resistor is set as the characteristic impedance of the single core bus, so that the reflection of the signal in the bus caused by medium impedance mismatch can be reduced. The influence of the distribution parameter of the transmission medium on the signal is reduced, the transmission distance of the signal is improved, and the signal transmission quality is improved. The influence of the length and characteristic impedance of the signal transmission medium and the architecture of a network bus on the transmission quality of signals is reduced. the anti-interference capability of the while-drilling downhole single core bus circuit apparatus is further improved. The embodiment of the invention can specifically utilize an instrument shell as a reference ground of bus system, and simultaneously realize two functions of bus signal transmission and bus power supply through a single core wire at an instrument connection interface. The stratum parameters include, but are not limited to, resistivity, sonic velocity, neutron porosity, density, bit pressure, torque, rotational speed, annulus pressure, temperature, and chemical composition. The instrument terminal unit may include one or more of the instruments associated with downhole measurements, such as one or more of the downhole instruments measuring resistivity, sonic velocity, neutron porosity, density, bit pressure, torque, rotational speed, annulus pressure, temperature, chemical composition, or a instrument for imaging logging, etc. Instrument A in FIG 1 refers to any of the downhole instruments; R is a terminal resistor, and the resistance value of the terminal resistor is equal to the characteristic impedance Zo; L is an inductor arranged between the bus power supply and the bus; Lc is a common-mode inductor; T is a coupling transformer. A bus instrument end can also be arranged underground. The bus instrument end is arranged between the single core bus and the instrument terminal unit, and the bus instrument end is communicatively connected with the single core bus and the instrument terminal unit. This enables the instrument terminal unit to communicate with the well-ground transmission system. The downhole instrument without a communication function can be ensured to communicate with the well-ground transmission system. When eacy downhole instrument in the instrument terminal unit has a communication function, the bus instrument end can be omitted. The characteristic impedance of the single core bus can be calculated by the following equations:
L= lIn
CO = F Int
L0 1 jIn bi C 0 271 E a
wherein a is a diameter of a transmission line inner conductor of the single core bus, b is a diameter of a transmission line outer conductor of the single core bus, Lo is an inductance per unit length of the single core bus,g is permeability, c is the circular constant, 1 is a length of conductor,
n is a number of coil turns, Co is capacitance per unit length of the single core bus, Zo is the
characteristic impedance, and e is a dielectric constant.
In the embodiment of the invention, the resistance values of the terminal resistors arranged at both
ends of the single core bus are equal to the calculated characteristic impedance of the single core
bus.
The central control unit includes a communication module, a programmable logic device and a coupling transformer; the communication module being electrically connected with the programmable logic device and the coupling transformer respectively;
the coupling transformer being used for coupling the stratum parameter information or the central
control command to the single core bus; the communication module being used for receiving and/or sending the stratum parameter information or the central control command; and
the programmable logic device being electrically connected with the communication module and
used for carrying out channel coding and decoding on the received stratum parameter information. According to the embodiment of the invention, the coupling transformer is used for sending the stratum parameter information to the communication module and used as an electrical coupling
transformer to transmit signals and achieve impedance matching. The communication module can
be simultaneously used for sending and receiving stratum parameter information. The circuit structure is simplified, and the device is more stable and reliable. Specifically, a center tap voltage of the coupling transformer is half a power supply voltage of the
communication module.
In the prior art, the center tap voltage of the coupling transformer is consistent with the power supply voltage of the communication module, so that the communication module is forced to form
a driving load. The load carrying capacity is greatly reduced, and the signal anti-interference
capability is poor. According to the embodiment of the invention, the center tap voltage of the
coupling transformer is reduced to half the power supply voltage of the communication module
chip, and two paths of signals of the coupling transformer are subjected to differential processing.
The phase correlation of the two paths of signals is fully utilized, the anti-interference capability of the system is greatly improved, and the error rate of the device is reduced. Here, the programmable logic device is exemplified by, but not limited to, an FPGA (Field Programmable Gate Array) or a CPLD (Complex Programmable Logic Device). In the prior art, a single chip microcomputer or a traditional UART (Universal Asynchronous Receiver/Transmitter) is generally used. The UART cannot normally receive a signal sent by the communication module from the coupling transformer because of the hysteresis effect, and a communication frame can be pulled down for a long time at last. The time that the communication frame is pulled down can be avoided by a programmable device FPGA or a CPLD without the hysteresis effect. Among other things, a manner of the channel coding and decoding may be, but is not limited to, Manchester encoding or differential Manchester encoding. The communication module is an RS-485 chip or a CAN (Controller Area Network) chip. Preferably, the RS-485 chip may be an RS-485 chip of model SN65HVD1-HT. If the power supply voltage of the RS-485 chip is Vcc, the center tap voltage of the coupling transformer is Vcc/2. In the prior art, a MOS switch tube driving circuit is adopted mostly. The filtering comparison circuit is adopted mostly for data receiving, and sending the data to the bus and receiving the data from the bus are realized by respectively and independently processing two signals with complementary phases. According to the invention, an RS-485 chip or a CAN chip is adopted to replace a transmitting and receiving circuit, circuit devices are reduced, and component failure rates are reduced. Referring to FIG. 3, FIG. 3 is a circuit diagram of laboratory test provided by the invention, which is a circuit diagram of laboratory test for the while-drilling downhole single core bus circuit apparatus according to an embodiment of the present invention. The specific process is as follows: The computer 1 sends data OxOO to FPGA 1, and FPGA 1 carries out Manchester coding on the data OxOO and sends a coded signal to the coupling transformer through the RS-485 chip. The signal is transmitted to another coupling transformer through the single core bus, wherein a direct current voltage of 30 V is added to the single core bus, which is isolated from the bus through an inductor to be connected. The other side of the bus is grounded through a capacitor. The signal is captured by another bus receiving circuit through the coupling transformer, decoded by the FPGA 2, and finally sent to the computer 2 to display the received data. A waveform of the output signal of FPGA 1 coded signal passing through the RS-485 chip, an output waveform of the coupling transformer at the receiving end, and a waveform output by the RS-485 chip at the receiving end to FPGA 2 are respectively measured.
Referring to FIG 4, FIG 4 is a waveform diagram provided by the invention after dataOxOO sent to the bus is coded, in particular a waveform diagram output after dataOxOO is coded by FPGA 1 and sent to the RS-485 chip. The uppermost waveform is a waveform diagram of signal BUS_Al, the lowermost waveform is a waveform diagram of signal BUS_B1, and the middle waveform diagram is a waveform diagram formed by subtracting signal BUS_B1 from signal BUSAl, starting from low-order digit in the data. Referring to FIGs. 5-7, FIG 5 is a signal diagram at the receiving end of the transformer sending data OxO on the bus provided by the present invention; FIG 6 is a waveform diagram of an output signal of the communication module at the receiving end provided by the present invention; FIG 7 is a schematic diagram of the output signal of the communication module at the receiving end provided by the present invention. In FIG 5, the three, upper, middle and lower, signals are output waveforms of a receiving coupling transformer. The uppermost waveform is a waveform diagram of signal BUSA2, the lowermost waveform is a waveform diagram of signal BUS_B2, and the middle waveform is a waveform diagram formed by subtracting signal BUS_B2 from signal BUSA2. Although the output waveform of the coupling transformer is similar to the waveform of the five transformers, the tail phenomenon of the signal at the end is different due to the action of the inductance, so that a long low level appears at the end of the output of the RS-485 chip and then the waveform jumps to a high level to terminate, as shown in FIG. 6. After a driving signal disappears, a magnetic core has a slow energy release stage. As the driving signal disappears, the system enters a high resistance state, and the energy release time is very long. In FIG 6, it is shown that 0.1 ms is the time when a resistance of 3k is added into an energy release loop. In fact, no matter how much resistance is added into the loop, the release time always exists, only lasting for different time under different working conditions. With such signal characteristics, normal data cannot be obtained if signals were acquired using conventional universal asynchronous receivers and transmitters, such as UART. When the FPGA is used for programming, an end bit can be changed into 0. After the signal is released, the final signal is restored to 1, and then the transmission of one byte is finished. To achieve normal transmission, an output pin is set to 1 when FPGA module is in receiving state. For FPGA programming, only the end bit is set as 0 at an emitting end, and the receiving end only waits for the end bit to change from 0 to 1. In addition, after the FPGA module enters the receiving mode, the pin signal is set to 1. From the data received with a serial port assistant tool software, it can be seen that the data is received and sent normally. The computer 1 sends a string "center control test" to a computer 2, and the computer 2 sends a string "terminal system test" to the computer 1. The two groups of strings end with a carriage return, sending a string every 0.1 s. The result shows that computer l's Tx sends 735 bytes to computer 2, and computer 2's Rx receives 735 bytes which are displayed correctly. Computer 2's Tx sends 1540 bytes to computer 1, and computer l's Rx receives 1540 bytes which are displayed correctly. The experiment result shows no error code, thereby proving the reliability and stability of the solution of the present invention. The foregoing only shows preferred embodiments of the invention and is not intended to limit the invention. It is intended that the protection scope of the present invention covers any modifications, such as equivalents and variations, provided they come within the spirit and scope of this invention.
Claims (6)
1. A while-drilling downhole single core bus circuit apparatus, characterized by including: a
central control unit, an instrument terminal unit and a single core bus;
the instrument terminal unit being used for forwarding a measured stratum parameter and
converting the stratum parameter into electrical signals and sending the stratum parameter
information to the central control unit;
the central control unit being used for forwarding the stratum parameter information to the surface
and sending a central control command to the instrument terminal unit;
the single core bus being electrically connected with the central control unit and the instrument
terminal unit respectively to realize data exchange between the central control unit and the
instrument terminal unit; a terminal resistor being arranged on the single core bus, and a resistance
value of the terminal resistor being a characteristic impedance of the single core bus;
the characteristic impedance of the single core bus satisfies the following equation:
Lo= "Ln 2r b.
In-. E,
wherein a is a diameter of a transmission line inner conductor of the single core bus, b is a
diameter of a transmission line outer conductor of the single core bus, Lo is an inductance per unit
length of the single core bus, p is permeability, 7c is the circular constant, 1 is a length of conductor,
n is a number of coil turns, Co is capacitance per unit length of the single core bus, Zo is the
characteristic impedance, and e is a dielectric constant;
the central control unit includes a communication module, a programmable logic device and a
coupling transformer, and the communication module is electrically connected with the
programmable logic device and the coupling transformer respectively;
the coupling transformer being used for coupling the stratum parameter information or the central
control command to the single core bus;
the communication module being used for receiving and/or sending the stratum parameter information or the central control command; and the programmable logic device being electrically connected with the communication module and used for carrying out channel coding and decoding on the received stratum parameter information.
2. The while-drilling downhole single core bus circuit apparatus according to claim 1, characterized by further including a bus instrument end communicatively connected with the single core bus and the instrument terminal unit, respectively.
3. The while-drilling downhole single core bus circuit apparatus of claim 1, characterized in that a
center tap voltage of the coupling transformer is half a supply voltage of the communication
module.
4. The while-drilling downhole single core bus circuit apparatus of claim 1, characterized in that
the programmable logic device is a field programmable gate array device or a complex
programmable logic device.
5. The while-drilling downhole single core bus circuit apparatus of claim 1, characterized in that a
manner of the channel coding and decoding is one of Manchester coding or differential
Manchester coding.
6. The while-drilling downhole single core bus circuit apparatus of claim 1, characterized in that
the communication module is an RS-485 chip or a CAN chip.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911093.6A CN110671098B (en) | 2019-09-25 | 2019-09-25 | Underground single-core bus circuit device while drilling |
| CN201910911093.6 | 2019-09-25 |
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| Publication Number | Publication Date |
|---|---|
| AU2020202877B1 true AU2020202877B1 (en) | 2020-11-26 |
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ID=69079452
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| AU2020202877A Active AU2020202877B1 (en) | 2019-09-25 | 2020-04-30 | While-drilling downhole single core bus circuit apparatus |
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| CN (1) | CN110671098B (en) |
| AU (1) | AU2020202877B1 (en) |
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| CN117614773A (en) * | 2024-01-15 | 2024-02-27 | 西安思坦仪器股份有限公司 | Communication system and construction tubular column of single-core cable based on oil-water well |
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| CN110671098B (en) * | 2019-09-25 | 2021-07-20 | 中国科学院地质与地球物理研究所 | Underground single-core bus circuit device while drilling |
| CN113676388B (en) * | 2021-09-16 | 2022-03-22 | 中国科学院地质与地球物理研究所 | Underground single-bus decoding system for logging while drilling and anti-interference method thereof |
| CN114780467B (en) * | 2022-04-13 | 2024-04-19 | 中海油田服务股份有限公司 | Control circuit and logging instrument |
| CN116357304B (en) * | 2023-04-14 | 2023-12-12 | 中国科学院地质与地球物理研究所 | Intelligent well guiding and drilling ground electromagnetic transmission ground emission system and method |
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| CN117614773A (en) * | 2024-01-15 | 2024-02-27 | 西安思坦仪器股份有限公司 | Communication system and construction tubular column of single-core cable based on oil-water well |
Also Published As
| Publication number | Publication date |
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| CN110671098B (en) | 2021-07-20 |
| CN110671098A (en) | 2020-01-10 |
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