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Method and system for transmitting pitshaft data

A data transmission method and data technology, applied in the field of oil drilling, can solve the problems of slow transmission rate, unusable pressure pulse, and inability to complete transmission medium.

Inactive Publication Date: 2010-06-16
WESTERN DRILLING KELAMAYI DRILLING TECH INST
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Problems solved by technology

[0004] (1) The device can only be used in pure liquid fluid drilling. In gas or gas-liquid mixed fluid drilling, due to the compressibility of the transmission medium, it cannot be used to transmit data in the form of pressure pulses.
[0005] (2) The transmission rate is slow, only 0.5-3bit / s

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  • Method and system for transmitting pitshaft data
  • Method and system for transmitting pitshaft data
  • Method and system for transmitting pitshaft data

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Embodiment Construction

[0046] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0047] figure 1 is the flow chart of wellbore data transmission, according to figure 1 The shown wellbore data transmission method is divided into three processes: bottom-hole data reception and processing, signal transmission and transmission, and ground reception, as follows:

[0048] a. Bottomhole data receiving and processing steps: the data acquisition system of the MWD instrument on the bottomhole drill string, or a utility model-a bottomhole data acquisition and transmission device (Chinese Patent Application No. The bottom-hole data collected by 2008200063778) or other bottom-hole data acquisition devices first convert the analog signal into a digital signal through the A / D conversion module, and then input the digital signal to the DSP signal processing module for processing. Synchronization signal + data signal" encoding format f...

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Abstract

The invention relates to a method and a system for transmitting pitshaft data in a drilling process in the field of petroleum drilling. The method comprises three steps of receiving and processing shaft bottom data, sending and transmitting a signal and receiving ground data. The method also comprises the following steps of: mounting a relay system in a drill stem to restore the signal; and by using the coupling rule of a piezoelectric transducer and the drill stem and the transmission characteristic of stress wave of the drill stem, automatically select the optimal frequency to transmit the signal along the drill stem through detection until being received by the ground, wherein the signal transmission adopts a chaotic oscillator detecting method which solves a Duffing equation by a four-order-Runge-Kutta method and judges whether the signal exists or not by a periodic value of the system so as to extract the useful weak signal. The system consists of a shaft bottom data receiving and sending system, a ground data receiving system and the relay system and can realize two-way signal transmission. The method and the system for transmitting the pitshaft data can be widely applied todrilling wells of liquid-based and gas-based fluid media and have high speed of data transmission and detection.

Description

technical field [0001] The invention relates to the field of oil drilling, in particular to a wellbore data transmission method and system. Background technique [0002] In recent years, the application of underbalanced drilling technology has made great progress, but one of the most important reasons why many underbalanced drilling operations fail to achieve the expected results is that the underbalanced drilling process cannot be maintained throughout the drilling process, resulting in damage to the formation and The occurrence of other complicated situations prevents the advantages of underbalanced technology in discovering and protecting oil and gas layers, solving special problems, and reducing costs from being fully utilized. The necessary condition, and the wellbore data transmission technology has become the technical key to realize real-time monitoring. [0003] Currently, the more popular wireless data-while-drilling device is the MWD used in horizontal wells and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/12
Inventor 罗维许树谦陈若铭宋朝晖唐亮周强
Owner WESTERN DRILLING KELAMAYI DRILLING TECH INST
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