Method for eliminating pump stroke jamming signals of drilling fluid logging while drilling transmission system

A data transmission system and interference signal technology, which is applied in the field of measurement while drilling, can solve the problems of unsatisfactory and poor effects of removing pump interference signals, and achieve the effect of accurately receiving and removing pump interference signals

Active Publication Date: 2015-11-11
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, the effect of these methods to remove the pumping

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  • Method for eliminating pump stroke jamming signals of drilling fluid logging while drilling transmission system
  • Method for eliminating pump stroke jamming signals of drilling fluid logging while drilling transmission system
  • Method for eliminating pump stroke jamming signals of drilling fluid logging while drilling transmission system

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Embodiment Construction

[0034] A detailed description will be given below in conjunction with the accompanying drawings.

[0035] The environment of the drilling fluid channel in the drilling fluid MWD system is very harsh, and due to the influence of on-site measurement conditions, the output signal of the pressure sensor installed on the riser to detect the drilling fluid pressure pulsation includes not only useful signals from downhole, but also Moreover, it contains large periodical pressure fluctuations caused by mud pumps compressing drilling fluid and pressure fluctuations and random noises caused by various other mechanical effects. Among them, the interference to the useful signal from downhole is represented by periodic pulses related to the pumping characteristics, and the noise is represented by broadband white noise and its amplitude is much larger than that of the useful signal. The signal at the wellhead is completely submerged in various noises. According to the actual measurement, c...

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Abstract

The invention discloses a method for eliminating pump stroke jamming signals of a drilling fluid logging while drilling transmission system. The method for eliminating the pump stroke jamming signals of the drilling fluid logging while drilling transmission system adopts an adaptive Fourier series compound mode to compound pump stroke jamming signals and synchronize with received downhole data signals based on a pump stroke jamming signal fundamental frequency by obtaining the pump stroke jamming signal fundamental frequency, and eliminates the pump stroke jamming signals in the received downhole data signals after being synchronized based on the pump stroke jamming signal fundamental frequency. The method for eliminating the pump stroke jamming signals of the drilling fluid logging while drilling transmission system can effectively remove pump stroke jamming signals, and enables drilling fluid to accurately receive downhole useful signals along with a ground received end in a logging while drilling transmission system.

Description

technical field [0001] The invention relates to the field of measurement while drilling, in particular to a pumping interference signal elimination method of a drilling fluid data transmission system while drilling. Background technique [0002] Measurement While Drilling (MWD: Measurement While Drilling) is a technology that can measure and collect logging data near the drill bit during the drilling process of the drill bit, and transmit the collected data to the ground system in real time. Well logging data usually includes formation property information and various drilling engineering parameters. As one of the most mature information transmission technologies currently used in drilling while drilling, the basic working principle of the drilling fluid pressure signal transmission mode is to convert the information measured downhole into control information, and apply the control information to the downhole drilling hydraulic pressure. The force signal generator changes t...

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Application Information

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IPC IPC(8): E21B47/18
Inventor 陈伟伍瑞卿顾庆水江佩佩
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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