A method and circuit for communication between downhole instrument and surface data
A downhole instrument and data intercommunication technology, applied in earthwork drilling, wellbore/well components, measurement, etc., can solve problems such as long transmission distance, large amount of transmitted information, narrow available bandwidth of single-core armored cable, etc., and achieve long-term Reliable distance to avoid attenuation effects
Active Publication Date: 2019-05-07
贵州航天凯山石油仪器有限公司
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Problems solved by technology
[0005] The object of the present invention is to provide a method and circuit for intercommunication between downhole instruments and ground data, so as to solve the problem of large amount of transmission information and long transmission distance and single-core armored cable The contradiction of narrow available bandwidth can not only ensure the stability of the power supply of downhole instruments, but also ensure the reliability of communication between the downhole and the ground, so as to overcome the shortcomings of the existing technology
Method used
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[0023] The block diagram of the circuit in this example is figure 1 As shown, the workflow of the entire circuit system is as follows: the microprocessor encodes the data signal, and performs four levels of encoding according to binary 00, 01, 10, and 11, corresponding to levels -5.0V, -2.5V, + 2.5V, 5.0V, after isolation by the double monostable circuit, then control the programmable signal amplifier to control the corresponding level amplitude, and then upload the signal to the multiplexed power data bus through the power drive circuit, thus completing the downhole instrument data signal Transmission of signals to the ground. After sending the signal, switch to the signal receiving circuit to filter and amplify the command signal sent from the ground to the underground, and then pass the signal to the RS trigger through the positive and negative pulse comparator to restore the ground digital signal.
[0024] The main improvements in this example are as follows:
[0025] 1....
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The invention discloses a method and a circuit for data intercommunication of a downhole device and the ground. A power supply data bus is utilized to transmit digital signals. A sending and receiving signal selection switch ensures that only one of a sending circuit and a receiving circuit can be hung on the power supply data bus at any time so as to solve the problem that the signals can be greatly attenuated by a resistance-capacitance element in a system circuit. Two-digital binary coding is utilized to replace the existing Manchester encoding to improve the communication efficiency. According to the method and circuit, the technical scheme of the two-digit binary coding is adopted, and the carrier level amplitude can be reduced to 1 / 2 to 1 / 4 of the existing level amplitude. The method and the circuit can ensure that the attenuation amplitude of a level within the length range of 10000 M is less than 20% of the initial value of a carrier, the data can be sent continuously without extra recovery time within a certain bandwidth range, continuous code data of 180 bit or above is transmitted reliably at a long distance, and the ideal effect is achieved.
Description
technical field [0001] The invention relates to a method and a circuit for data intercommunication between downhole instruments and ground, and belongs to the technical field of data intercommunication between downhole and ground in oil fields. Background technique [0002] The data communication between the downhole instrument and the ground is usually completed by a single-core armored cable that provides power for the downhole instrument. The specific method is to load the carrier signal containing data information onto the core wire of the single-core armored cable, and the The cable completes the power supply and data transmission tasks of downhole instruments at the same time. However, the single-core armored cable is affected by parameters such as distributed capacitance and distributed resistance, and the available bandwidth of the cable is very narrow. For a long time, it has been the bottleneck that caused a large amount of logging information to be unable to be tr...
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IPC IPC(8): E21B47/12
Inventor 曾勇朱亮胡世宇贾昌磊龙先明
Owner 贵州航天凯山石油仪器有限公司