Wireless measurement while drilling system and method

A wireless measurement-while-drilling and measurement-while-drilling technology, applied in measurement, earthmoving, wellbore/well components, etc., can solve the problems of high EM-MWD transmission rate, great influence of formation resistivity, high transmission rate, etc. , to achieve good compatibility, strong applicability, and easy on-site construction.

Inactive Publication Date: 2014-07-02
THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology

[0007] The invention provides a wireless measurement-while-drilling system and method to at least solve the problems in related technologies that MWD has high requirements on drilling medium and low transmission rate, and EM-MWD has high transmission rate but is greatly affected by formation resistivity.

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  • Wireless measurement while drilling system and method

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Embodiment Construction

[0042] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0043] In related technologies, MWD and EM-MWD have their own advantages and disadvantages. MWD has high requirements on drilling medium and low transmission rate, while EM-MWD has high transmission rate but is greatly affected by formation resistivity. For this reason, the embodiment of the present invention provides a kind of wireless measurement while drilling system, figure 1 is a structural block diagram of a wireless measurement-while-drilling system according to an embodiment of the present invention, as figure 1 As shown, the system includes downhole tools 12 and surface systems 14 .

[0044] Wherein, the downhole instrument 12 includes: an electromagnetic wave measurement-while-drill...

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Abstract

The invention discloses a wireless measurement while drilling system and method. The system comprises an underground instrument and a ground system. The underground instrument comprises an electromagnetic wave measurement while drilling device used for carrying out measurement while drilling through electromagnetic waves, a drilling fluid pressure pulse measurement while drilling device used for carrying out measurement while drilling through drilling fluid pressure, and a transmitting and receiving machine connected to the electromagnetic wave measurement while drilling device and the drilling fluid pressure pulse measurement while drilling device and used for controlling switching of the work modes of the underground instrument according to signals from the ground system. The work modes comprise an electromagnetic wave transmission mode and a drilling fluid pressure pulse mode. The ground system is compatible with demodulating and decoding of the two work modes and is used for carrying out digital signal processing on the signals generated under the electromagnetic wave transmission mode and / or the drilling fluid pressure pulse mode. According to the system, well logging combination of different transmission modes is achieved, and underground working of the two modes can be selected at the same time or underground working of one mode can be selected according to needs. The system is flexible, compatible and high in applicability.

Description

technical field [0001] The invention relates to the field of measurement-while-drilling, in particular to a wireless measurement-while-drilling system and method. Background technique [0002] Wireless measurement while drilling technology can be divided into: Mud Pulse Measurement While Drilling (Mud Pulse Measurement While Drilling, referred to as MP-MWD (currently collectively referred to as MWD, hereinafter referred to as MWD)) and electromagnetic wave measurement while drilling ( Electromagnetic Measurement While Drilling, referred to as EM-MWD). The former uses drilling fluid as the transmission medium, while the latter uses the formation as the transmission medium. The two have different characteristics, and they complement each other and become the main tool for wireless measurement while drilling. In addition, according to the measurement-while-drilling distance of the drill bit position, it also includes near-bit measurement technology. The near-bit measurement is...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/12E21B47/13E21B47/18
Inventor 李天禄姚士勇范业活陈冬海李英林方娟袁咏昕刘剑侯安飞
Owner THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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