System for realizing constant current source power supply and bidirectional data transmission through shared cable
A two-way transmission, power supply system technology, used in surveying, wellbore/well components, earthmoving, etc.
Active Publication Date: 2012-08-22
航天科工惯性技术有限公司
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Problems solved by technology
However, its transmission is one-way transmission, and there is a shortcoming that it cannot realize two-way transmission on the same cable.
Method used
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[0012] see figure 1 , figure 2 with image 3 , an embodiment of a constant current source power supply and data shared cable for two-way transmission system provided in the invention, including a ground system 1 and a downhole instrument 2, both of which are equipped with receiving and transmitting Units 11, 21, the receiving and sending unit 11 in the ground system 1 is connected to the receiving and sending unit 21 of the downhole instrument 2 through a cable 3, and the ground system 1 is provided with a constant current source power supply system 12. The power in the power supply system 12 is transmitted to the downhole tool 2 through the cable 3, and the downhole data sent by the receiving and sending unit 21 of the downhole tool 2 is loaded onto the power signal, and thus transmitted to the downhole tool 2. The ground system 1, the ground system 1 is also provided with a transmission control signal generation unit 13, the transmission control signal generation unit 13 ...
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The invention discloses a system for realizing constant current source power supply and bidirectional data transmission through a shared cable. The inside of each of a ground system and an underground device is provided with a receiving and transmitting unit, wherein the receiving and transmitting unit in the ground system is connected with the receiving and transmitting unit in the underground device through the cable; the inside of the ground system is provided with a constant current source power supply system; underground data transmitted by the receiving and transmitting unit of the underground device is loaded to a power signal which is transmitted to the ground system; the ground system is also provided with a transmission control signal generation unit; the transmission control signal generation unit generates a conversion pulse signal which is superposed onto an underground data signal of the receiving and transmitting unit of the underground device and is transmitted to the underground device to make the receiving and transmitting unit of the underground device in a data receiving status; and at the moment, the receiving and transmitting unit of the ground system transmits ground data to the receiving and transmitting unit of the underground device. The system can realize the bidirectional data transmission on only one cable.
Description
technical field [0001] The invention relates to a power supply and data transmission system for ground systems and downhole instruments in deep wells, in particular to a constant current source power supply and data sharing a cable for bidirectional transmission. Background technique [0002] At present, the power supply and data transmission of petroleum logging instruments mostly use independent cables, and at least 4 cables are required. Since the number of logging cables is fixed, independent cables are used for power supply and transmission. The fatal disadvantage of fewer well instruments. There are two main power supply schemes commonly used for petroleum logging instruments, one is for constant voltage source power supply; the other is for constant current source power supply, and there is also a technical scheme for constant current source power supply, transmission and power supply sharing cables. The commonly used cable technology for power supply and data transm...
Claims
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IPC IPC(8): E21B47/14E21B47/12
Inventor 王晋麟吕伟安金刚马慧斌牟春雷
Owner 航天科工惯性技术有限公司