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Method for eliminating pump stroke noise in logging-while-drilling well by using echo counteraction technology

An echo cancellation and logging-while-drilling technology, applied in surveying, earthmoving, wellbore/well components, etc., can solve the problems of increasing the bit error rate and affecting the accuracy of data decoding, reducing the bit error rate and improving the Received signal quality, the effect of reducing the bit error rate

Active Publication Date: 2015-01-07
GOALTECH
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AI Technical Summary

Problems solved by technology

The drilling signal is interfered by environmental noise, which increases the bit error rate and affects the accuracy of data decoding

Method used

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  • Method for eliminating pump stroke noise in logging-while-drilling well by using echo counteraction technology
  • Method for eliminating pump stroke noise in logging-while-drilling well by using echo counteraction technology
  • Method for eliminating pump stroke noise in logging-while-drilling well by using echo counteraction technology

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific examples.

[0029] The method for eliminating pumping noise in LWD described in this embodiment using echo cancellation technology is as follows:

[0030] 1) Use FIR low-pass filter to filter environmental noise (comprising torque noise, pumping noise, drill bit noise, etc.), wherein, the FIR low-pass filter setting parameters include filter type, sampling frequency, stop band and pass band frequency, ripple factor, etc., such as image 3 shown.

[0031] 2) Use an adaptive filter to eliminate the pumping noise, wherein the signal collected by the pumping sensor is used as the input of the adaptive filter, and the noise generated by the mud pump is regarded as being distorted by the pumping signal through the mud channel The resulting echo is continuously adjusted by the feedback value to generate an output similar to the pumping noise, which is reversely added to the original signal to ...

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Abstract

The invention discloses a method for eliminating pump stroke noise in a logging-while-drilling well by using an echo counteraction technology. The method comprises the following steps: (1) the environmental noise is filtered by using a FIR low-pass filter, wherein set parameters of the FIR low-pass filter comprise a filter type, a sampling frequency, frequencies of a stop band and a pass band and a ripple factor; (2) the pump stroke noise is eliminated by using an adaptive filter, wherein signals acquired by a pump stroke sensor are used as inputs of the adaptive filter, and noise generated by a slurry pump is used as echoes formed by distorting the pump stroke signal by a slurry channel; the coefficients of the filter are continuously adjusted by using feedback values to generate outputs similar to the pump stroke noise; and the influence on the signals from the pump stroke noise is eliminated through reverse summation with original signals. The method eliminates the pump stroke noise by using the echo counteraction technology for the input signals containing the pump stroke noise, so that the quality of measurement signals obtained by the logging-while-drilling well is improved.

Description

technical field [0001] The invention relates to the technical field of eliminating pumping noise in logging-while-drilling, in particular to a method for eliminating pumping noise in logging-while-drilling by using echo cancellation technology. Background technique [0002] The wireless logging while drilling system is a logging method commonly used in drilling in the world at present. It can measure geological parameters and wellbore trajectory parameters in real time while drilling, and draw various types of logging curves to provide a basis for the next step of construction. [0003] Such as figure 1 As shown, the operation process in a conventional drilling facility is illustrated as follows: [0004] The mud 10 is drawn from the mud pit 11 by one or more mud pumps 12, which are usually piston reciprocating pumps. The mud 10 passes through the mud pipeline 13, reaches the drill string 14, passes through the drill bit 15, returns to the surface through the annular spac...

Claims

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Application Information

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IPC IPC(8): E21B47/18
CPCE21B47/18
Inventor 王肄辉刘海熊陵
Owner GOALTECH
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