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A broadband data transmission system and method for drilling fluid channels

A data transmission method and technology for a data transmission system, which are applied to digital transmission systems, transmission systems, and multiple use of transmission paths, can solve problems such as low data transmission rate, low data transmission efficiency, and attenuation of drilling fluid pressure signal strength, etc. To achieve the effect of increasing the transmission rate

Inactive Publication Date: 2017-07-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

However, for the drilling fluid pressure transmission system, during the transmission process of the pressure pulse signal from the bottom of the well to the wellhead in the drill string, since the drilling fluid belongs to the three-phase flow of gas, liquid and solid, it contains solids such as clay, cuttings, and barite powder. Phase substances, and there are often gas phase substances such as free gas, the strength of the drilling fluid pressure signal generated by the pulse generator will continue to attenuate, the degree of attenuation is affected by the signal frequency and transmission distance, and the data transmission efficiency is low
[0005] In short, the drilling fluid channel is a very complex channel. The transmission technologies currently used on this channel include: pulse transmission and continuous wave transmission. Both of these two transmission methods only use the low frequency band of the drilling fluid channel to transmit information. , the pulse mode generally can only reach 3bps, and the continuous wave transmission mode can only reach the transmission rate of 12bps, and the data transmission rate is low

Method used

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  • A broadband data transmission system and method for drilling fluid channels
  • A broadband data transmission system and method for drilling fluid channels
  • A broadband data transmission system and method for drilling fluid channels

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Embodiment 1

[0064] Embodiment 1: The modulation mode of the information transmission channel described in the broadband data transmission system for the drilling fluid channel of this embodiment adopts the BPSK modulation mode, and the encoding of the information transmission channel adopts the BCH encoding mode, such as Figure 4 As shown, the data demultiplexer decomposes downhole logging data (such as bit stream) into Q sub-data (sub-bit stream) output, and N information transmission channels with different resonance frequencies correspond to the Q The sub-data are transmitted to the wellhead; wherein, one information transmission channel in the N information transmission channels only transmits one sub-data in the Q sub-data, that is to say, each information transmission channel only transmits decomposed logging data One of the sub-data, each sub-data corresponds to an information transmission channel, where Q and N are both integers greater than or equal to 1, Q=N.

[0065] The BCH c...

Embodiment 2

[0066] Embodiment 2: Each information transmission channel in the broadband data transmission system for drilling fluid channels in this embodiment adopts different coding and modulation modes, which is a mixed coding and modulation mode (taking 4 channels as an example).

[0067] Image 6 What is displayed is a 4-channel hybrid coding modulation broadband data transmission system for drilling fluid channels, 1 channel adopts BCH coding + BPSK modulation, 2 channels use convolution coding + QPSK modulation, 3 channels use RS coding + 2FSK modulation, 4 The channel adopts BCH encoding + CPM modulation. In this case, the data can be assigned to different information transmission channels for transmission according to the different requirements of different types of measurement data on delay and bit error rate during data demultiplexing to ensure reliable data transmission.

[0068] The present invention utilizes the amplitude-frequency response characteristic of the drilling fl...

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Abstract

The invention discloses a broadband data transmission system and method for a drilling fluid channel. The method comprises the steps that a drilling fluid channel pulse signal attenuation model is utilized for carrying out the analysis to obtain a frequency-domain characteristic curve with the pulse signal attenuation; a pulse signal transmission frequency-domain model in the drilling liquid channel is utilized for carrying out the analysis to obtain a transfer function of the drilling liquid channel, and an amplitude-frequency response curve of the drilling liquid channel is obtained according to the transfer function; N different resonant frequency points of the drilling liquid channel are selected according to the amplitude-frequency response curve and the frequency-domain characteristic curve to serve as information transmission channels respectively, and the N information transmission channels with the different resonant frequencies are formed; underground log data are decomposed into M subdata, and the M subdata are transmitted to a well mouth through the N information transmission channels. The information is transmitted through the multiple channels, broadband transmission is achieved, and the transmission rate is greatly increased.

Description

technical field [0001] The invention relates to the field of measurement-while-drilling data transmission, in particular to a broadband data transmission system and method for drilling fluid channels. 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. [0003] As one of the best 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 the pressure o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L1/00
CPCH04L5/0005
Inventor 陈伟伍瑞卿顾庆水江佩佩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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