Characteristics of NMR Logging While Drilling Tools

Abstract

Abstract:

NMR logging while drilling (LWD) has the advantage of detecting formation in-situ, and is a big progress in NMR logging. Compared with wireline NMR, NMR LWD is often performed in more hostile environment. In this paper, the magnet structures of typical NMR LWD tools, such as MRIL-WD (Halliburton), proVISION (Schlumberger) and MagTrak (Baker Hughes), were simulated and analyzed. Finite element method was employed to calculate the magnetic field distribution. The results were shown to be in good agreement with the typical tools’ nominal features. Based on the results of simulation, we proposed schemes to suppress or eliminate the effects of tool motion during drilling. This work provided insights for NMR LWD tools design, implement and optimization.

Key words: NMR logging while drilling, finite element method, magnetic field distribution

CLC Number:

LI Xin, XIAO Li-Zhi, HU Hai-Tao. Characteristics of NMR Logging While Drilling Tools[J]. Chinese Journal of Magnetic Resonance, 2011, 28(1): 84-92.

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