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Oil-based drilling fluid while-drilling lateral direction well-logging device and method

An oil-based drilling fluid and azimuth technology, which is applied in wellbore/well components, earthwork drilling and production, etc., can solve the problem of blocking the direct flow path, and achieve the effect of increasing the formation detection depth

Active Publication Date: 2017-05-31
ZHEJIANG UNIV
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Problems solved by technology

However, the existence of oil-based drilling fluid means that an insulating medium is added between the detection electrode in direct contact with the formation to be measured, which blocks the direct flow path, making the logging-while-drilling technology under ordinary water-based drilling fluid no longer possible. Be applicable

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  • Oil-based drilling fluid while-drilling lateral direction well-logging device and method
  • Oil-based drilling fluid while-drilling lateral direction well-logging device and method
  • Oil-based drilling fluid while-drilling lateral direction well-logging device and method

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Embodiment Construction

[0027] Such as figure 1 As shown, the oil-based drilling fluid lateral azimuth logging device includes a sinusoidal AC excitation source 1 , a lateral azimuth logging while drilling sensor 2 , a signal acquisition module 3 and a computer 4 . The sinusoidal AC excitation source 1 provides excitation signals for the lateral azimuth logging while drilling sensor 2, and the measured current signal generated by the lateral azimuth logging while drilling sensor 2 is amplified and collected by the signal acquisition module 3, and transmitted to the computer 4 for processing. further signal processing.

[0028] Such as figure 2 As shown, the lateral azimuth logging while drilling sensor 2 includes: a drill collar 5 , a drill bit 6 , a helical ring excitation coil 7 and several button electrodes 8 . During logging operations, the lateral azimuth logging while drilling sensor 2 is located in the wellbore 10 , and the gap between them is filled with oil-based drilling fluid 11 . Outs...

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Abstract

The invention discloses an oil-based drilling fluid while-drilling lateral direction well-logging device and method. The device comprises a sine alternating-current excitation source, a while-drilling lateral direction well-logging sensor, a signal collection module and a computer. An excitation mode based on electromagnetic induction principles is adopted to replace conventional direct excitation modes, so that limitation of the later is overcome; an equivalent circuit model for well-logging is built on the basis of capacitive coupling principles, and digital phase-sensitive demodulation technology is utilized to solve the problem of current signal detection when oil-based drilling fluid is used; button-shaped electrodes are adopted to detect strata in different directions, so that well-logging information like strata resistivity imaging in the process of drilling can be acquired. The device has the advantages of simple and reliable structure, high measuring accuracy and wide measuring range, and a method which can be used for reference is provided for well-logging while drilling under the condition of the oil-based drilling fluid.

Description

technical field [0001] The invention relates to the field of petroleum well logging, in particular to an oil-based drilling fluid lateral azimuth logging while drilling device and method. Background technique [0002] Well logging refers to the method of measuring geophysical parameters by using the electrochemical properties, electrical conductivity, acoustic properties, radioactivity and other geophysical properties of rock formations. Well logging technology is used to explore oil and gas resources in formations, and plays a pivotal role in the petroleum industry. According to different logging methods, logging methods can be divided into two categories: wireline logging and logging while drilling. Geological parameters are measured while drilling. Due to its good real-time performance, accuracy of measurement data and low operating cost, LWD technology is gradually replacing traditional wireline logging and plays an important role in directional drilling. [0003] Dri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 王保良陆军轶冀海峰黄志尧李海青
Owner ZHEJIANG UNIV
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