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Experimental Investigation of Formation Rock Drillability Under Bottomhole Differential Pressure Conditions

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Chemistry and Technology of Fuels and Oils Aims and scope

Quantitative evaluation of rock drillability is of vital importance for selecting drilling bits and optimizing drilling parameters. The existing drillability evaluation methods are mostly designed for balanced and near-balanced drilling situation (roughly 0 bottomhole differential pressure), while investigations of under-balanced drilling are rare. In this work, rock drillability and acoustic velocity testing devices are used to investigate rock drillability in an under-balanced drilling situation. The experimental results showed that bottomhole differential pressure produces a great impact on both rock drillability and acoustic characteristics. Mathematical statistics methods have been applied to analyze the correlations between rock drillability and acoustic characteristics as well as between differential pressure and acoustic characteristics, and to build a model for forecasting rock drillability under various bottomhole differential pressures. The model provides a sound approach to quantitative assessment of rock drillability based on log data.

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Authors and Affiliations

  1. China University of Petroleum, Petroleum Engineering Department, Beijing, China

    Zhang Hui & Gao Deli

  2. CNOOC research institute, Beijing, China

    Sun Tengfei

  3. Yangtze University, Hubei, Wuhan, China

    Huang He

Authors
  1. Zhang Hui
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  2. Sun Tengfei
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  3. Huang He
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  4. Gao Deli
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Corresponding author

Correspondence to Huang He.

Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 46 – 49, May – June, 2016.

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Hui, Z., Tengfei, S., He, H. et al. Experimental Investigation of Formation Rock Drillability Under Bottomhole Differential Pressure Conditions. Chem Technol Fuels Oils 52, 310–317 (2016). https://doi.org/10.1007/s10553-016-0709-y

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  • DOI: https://doi.org/10.1007/s10553-016-0709-y

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