Multi-functional communication control system for downhole instrument

A downhole instrument and control system technology, which is applied in wellbore/well components, measurement, earthwork drilling and production, etc., can solve the problems that the horizontal well section cannot be fed into the instrument, and achieve the reduction of development cost, saving of communication resources, and anti-interference strong effect

Pending Publication Date: 2017-05-31
SINOPEC JIANGHAN OILFIELD SERVICE CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the development of deep oil and gas layers adopts horizontal drilling technology. Due to the difference between horizontal wells and conventional wells, the traditional technology of logging and workover tools that are suspended by gravity and fed by cables cannot realize the delivery to horizontal well sections. Requirements for entering the instrument

Method used

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  • Multi-functional communication control system for downhole instrument
  • Multi-functional communication control system for downhole instrument
  • Multi-functional communication control system for downhole instrument

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] refer to figure 1 , the present invention is composed of a digital modulation circuit and a digital demodulation circuit.

[0016] refer to figure 2 , the switch circuit is composed of JK flip-flop, NAND gate, transistor Q1 and Q2, capacitor C1, C2 resistor R1, R2, R3, R4, R5, R6, R7, R8, R9 and Zener diode D1 and D2, fast Recovery diode D3, D4 composition. The switch circuit is respectively turned on when the output signal of the counter is "0" and "1", and finally the output signal is modulated into the logging cable through the DC blocking capacitor to realize the carrier communication.

[0017] refer to image 3 , the filter circuit is composed of a low-pass filter circuit with gain and a pass filter circuit. U3 and its peripheral circuits constitute a low-pass filter circuit with gain, and U4 and its peripheral circuits constitute a pass filter circ...

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Abstract

The invention relates to a multifunctional communication control system for downhole instrument. The 2FSK (binary frequency shift key control) digital modulation and demodulation mode is used. Firstly the signals sent from the ground to the downhole instrument pass through a modulation circuit made of a crystal oscillator, a counter, a switch circuit and the like to be modulated. The modulated signals are transmitted to the downhole instrument through logging cable carriers. The signals in the logging cable pass through a demodulation circuit made of a DC current isolating capacitor, an over-voltage protection circuit, a power amplifying low pass filter, a band pass filter, phaselocked loop and the like, and the signals sent from the downhole are modulated to achieve the communication between a ground control system and the downhole instrument. The circuit is simple and practical, the use of the digital modulation and demodulation method and the use of the phaselocked loop technology to demodulate the signals can bring good stability and anti-interference capability.

Description

technical field [0001] The invention relates to a design for realizing communication between a surface control system and downhole instruments, in particular to a multifunctional communication control system for downhole instruments. Background technique [0002] In recent years, as our demand for oil and the difficulty of oil exploration and development have increased, in order to increase the success rate of exploration and development and reduce development costs. At present, most of the development of deep oil and gas layers adopts horizontal drilling technology. Due to the difference between horizontal wells and conventional wells, the traditional technology of logging and workover tools that are suspended by gravity and fed by cables cannot realize the delivery to horizontal well sections. into the instrument requirements. It is against this background that the horizontal well tractor emerges at the historic moment. [0003] When designing a horizontal well tractor, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/12
CPCE21B47/12
Inventor 廖勇杨国圣饶海涛张志华王维石元会
Owner SINOPEC JIANGHAN OILFIELD SERVICE CORP
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