J4 ›› 2011, Vol. 41 ›› Issue (5): 1623-1629.

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Methods for Real-Time Determination of Formation Boundary with LWD Resistivity Logs in Horizontal Wells

CHEN Hua1, FAN Yi-ren1, DENG Shao-gui1, LI Zhi-qiang2, YANG Zhen1,3   

  1. 1. Key Laboratory of Welllogging/College of Mathematics and Computational Science, China University of Petroleum, Dongying 257061,Shandong,China;
    2. China Research Institute of Radiowave Propagation, Xinxiang453003, Henan, China;
    3. The 3rd Academy of China Aerospace Science and Industry Corporation, Beijing 100074, China
  • Received:2010-12-18 Online:2011-09-26 Published:2011-09-26

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Abstract:

Real-time determination of formation boundary is one of the key problems in geological directional drilling of horizontal wells. Considering mud resistivity and borehole have less effect on LWD electromagnetic wave in a certain range, 3D formation model was simplified as 1D formation model，the forward computation time can be reduced greatly. The distances between instrument and formation boundary are reconstructed using the real time inversion of marquardt method. Experiment result shows that computed location agree with the actual formation boundaries, so running track of the instrument can be controlled, it can maintain the borehole in a desired geological bed, and further improves the capability of geo-steering in horizontal wells.

Key words: well logging, LWD electromagnetic wave, geo-steering, Marquardt method, formation boundary

CLC Number: 

  • P631.9
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