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Wellbore Pressure Analysis and Control Countermeasures of Deepwater Gas Hydrate for Horizontal Well Drilling

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
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Chemistry and Technology of Fuels and Oils Aims and scope

The deepwater natural gas hydrate layer is shallowly buried and the formation structure strength is low, which leads to the narrow drilling pressure window of the hydrate formation and easy to occur borehole leakage, causing great difficulties to drilling. In this paper, the influence of wellbore pressure on deepwater natural gas hydrate horizontal well is deeply calculated and analyzed from three aspects: the bushing height of the drill floor, the drilling cuttings and the circulation equivalent of the drilling fluid.Additionally, the influence factors of wellbore pressure in each drilling procedure of deepwater closed-circuit drilling and open-water drilling are deeply analyzed and discussed. Through the above thorough analysis, the drilling mode that each drilling procedure should adopt is found. Finally, the wellbore pressure control countermeasures and future technical research direction of deepwater gas hydrate horizontal well drilling are obtained.

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Authors and Affiliations

  1. CNPC Offshore Engineering Company Limited, Beijing, China

    Heen Zhang

  2. China University of Petroleum-Bejing, Beijing, China

    Yao Zhou

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  1. Heen Zhang
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  2. Yao Zhou
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Correspondence to Yao Zhou.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 4, pp. 86–91 July –August, 2022.

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Zhang, H., Zhou, Y. Wellbore Pressure Analysis and Control Countermeasures of Deepwater Gas Hydrate for Horizontal Well Drilling. Chem Technol Fuels Oils 58, 684–690 (2022). https://doi.org/10.1007/s10553-022-01436-x

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