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Imaging subterranean formations and features using azimuthal phase encoding

A technology of azimuth and stratum, applied in the directions of using magnetic variable measurement, earthwork drilling and mining, utilizing re-radiation, etc., can solve problems such as harsh operating environment

Active Publication Date: 2018-08-31
SCHLUMBERGER TECH LTD BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, downhole tools operate in a much harsher environment than the laboratory environment of an imaging facility

Method used

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  • Imaging subterranean formations and features using azimuthal phase encoding
  • Imaging subterranean formations and features using azimuthal phase encoding
  • Imaging subterranean formations and features using azimuthal phase encoding

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Embodiment approach

[0041] This discussion relates to performing azimuthal imaging using nuclear magnetic resonance (NMR) measurements acquired in the context of logging while drilling, as described above. Such methods employ forward modeling and inversion algorithms as part of the azimuthal imaging process and, as discussed herein, may use a variety of different kinds of components to acquire azimuth measurements, including but not limited to gradient coils, The gradient coils may include azimuth phase encoding coils. The generalized forward model is a linear transformation of formation-dependent properties, such as the azimuth-dependent T 2 distribution, and is a convolution of these properties with a time-dependent kernel. The inversion algorithm is based on deconvolution of the measured data with a known kernel after expansion into a basis of suitable orthogonal functions such as Fourier or Halkey. Such azimuth information is useful for geosteering and obtaining azimuth-dependent formation ...

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Abstract

Systems and methods are provided for investigating a downhole formation using a nuclear magnetic resonance (NMR) tool. While the tool is moving through the borehole, the formation is magnetized and resulting signals are obtained. In accordance with the present approach, the acquired signals can be resolved azimuthally and / or laterally and can be reconstructed to obtain an indication of a parameterof the formation at multiple locations along the length of the borehole.

Description

Background technique [0001] The present disclosure relates to the use of nuclear magnetic resonance (NMR) in the context of imaging subsurface formations and features. In certain embodiments, the subject matter relates to methods for facilitating azimuthal imaging in a borehole using NMR in combination with azimuthal phase encoding. [0002] This section is intended to introduce the reader to various aspects of art, which may be related to various aspects of the technology described and / or claimed below. It is believed that this discussion helps to provide the reader with background information to facilitate a better understanding of various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light and not as an endorsement of any kind. [0003] Magnetic resonance imaging involves the spatial localization of protons within the sample space. Nuclear Magnetic Resonance (NMR) tools for well logging or downhole fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00G01R33/44G01V3/32G01V3/38
CPCG01V3/32G01V3/38
Inventor J·L·鲍尔森Y-Q·宋L·温卡塔拉玛南R·卡伦
Owner SCHLUMBERGER TECH LTD BV