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Unidirectional echo and noise suppression method used in drill string acoustic transmission technology

A technology of echo noise and transmission technology, which is applied in the fields of earthwork drilling, voice analysis, measurement, etc., and can solve the problems of obvious differences in acoustic impedance and interference with the reception of useful signals.

Inactive Publication Date: 2012-10-17
BEIHANG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In particular, due to the obvious difference in acoustic impedance between the drill pipe and the pipe collar, strong reflection echoes will be generated at their connection, and multiple reflection echoes are superimposed on each other, which interferes with the reception of useful signals

Method used

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  • Unidirectional echo and noise suppression method used in drill string acoustic transmission technology
  • Unidirectional echo and noise suppression method used in drill string acoustic transmission technology
  • Unidirectional echo and noise suppression method used in drill string acoustic transmission technology

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Embodiment Construction

[0064] Now in conjunction with the accompanying drawings and embodiments, the detailed description is as follows: the present invention realizes a one-way echo noise suppression model for drill string acoustic transmission technology by establishing a model for echo noise suppression for drill string acoustic transmission technology Inhibition method, the specific steps of the method are as follows:

[0065] step 1. Transmission channel capacity analysis, the specific analysis method is as follows:

[0066] Step a1. Analysis of noise sources in the acoustic wave transmission system while drilling

[0067] There are two kinds of noise in the sound wave transmission system while drilling, one comes from the drill bit, which is produced by the downhole drill bit breaking the rock formation, and is represented by n b Indicates that it can be uploaded to the ground through the drill string channel; another noise comes from the ground equipment, which is caused by the electrical o...

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Abstract

The invention relates to a unidirectional echo and noise suppression method used in a drill string acoustic transmission technology, and belongs to the technical field of downhole data transmission during the well drilling process. In order to solve the problem that the transmission performance of an acoustic signal in a drill string is reduced due to echo and noise resulting from factors such asground noise, a discontinuous structure of the drill string and the like in the prior art, by virtue of transient pulse response of uplink and downlink channels of the drill string, an improved echo and noise suppression modeling method is adopted so as to achieve the purpose of suppressing the downhole echo and noise by a receiving mode based on double sound receivers. Therefore, the unidirectional echo and noise suppression method has the beneficial effects of improving the signal-to-noise ratio of a receiving signal, increasing the transmission rate, shortening the logging period and saving the well drilling cost; and the method is characterized in that the adopted structure is simple.

Description

technical field [0001] The invention belongs to the technical field of downhole data transmission in the drilling process, and in particular relates to a one-way echo noise suppression method for drill string acoustic transmission technology, which is used to effectively suppress downlink ground noise in the drill string channel in logging while drilling and the impact of reflected echoes on the extraction of uplink useful signals. Background technique [0002] As a new method to replace the traditional wireline logging, downhole information transmission technology in logging while drilling has become an international research hotspot. The currently widely used mud pulse technology has the disadvantage of very low transmission rate, generally only 10bit / s, and its signal-to-noise ratio is more easily affected by drilling fluid and field noise. Therefore, as an optional underground high-speed data transmission method, acoustic wave transmission technology has received extens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02E21B47/14G10L21/0224
Inventor 李成刘钊樊尚春井中武
Owner BEIHANG UNIV
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