Volume 39 Issue 5
Jan.  2023
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REN Guanlong, MENG Wenbo, HE Yufa, et al.Optimization of hydrate inhibition performance of deep water shallow drilling fluid[J]. Drilling Fluid & Completion Fluid，2022, 39（5）：529-537 doi: 10.12358/j.issn.1001-5620.2022.05.001
Citation: REN Guanlong, MENG Wenbo, HE Yufa, et al.Optimization of hydrate inhibition performance of deep water shallow drilling fluid[J]. Drilling Fluid & Completion Fluid，2022, 39（5）：529-537 doi: 10.12358/j.issn.1001-5620.2022.05.001
shu

Optimization of Hydrate Inhibition Performance of Deep Water Shallow Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2022.05.001
  • 1.

    CNOOC Zhanjiang Branch Company, Zhanjiang，Guangdong 524057

  • 2.

    CNOOC Research Institute Co., Ltd, Beiijing 100029

  • 3.

    China University of Petroleum(East China), Qingdao, Shandong 266580

  • Received Date: 2022-04-09
  • Accepted Date: 2022-06-20
  • Rev Recd Date: 2022-04-29
  • Publish Date: 2023-01-10
    Abstract
  • The deep water and shallow geological conditions are complex, the soil is loose, the operating pressure window is narrow, the submarine mud line temperature is low, and hydrates are easy to form in the well bore. The drilling fluid is faced with problems such as well bore stability, difficulty in regulating low-temperature rheology, environmental pollution and so on, so the drilling safety operation risk is high. Therefore, taking the shallow drilling of a deep water well in the South China Sea as the research object, the application status of deep-water shallow drilling fluid are summarized and analyzed, the ECD calculation model and well bore temperature field calculation model is established, and the well bore temperature field distribution and hydrate formation risk during deep-water shallow drilling is analyzed. The hydrate inhibition performance of shallow drilling fluid system is optimized in combination with numerical simulation and indoor experiments. The following research results are obtained. First, compared with the measured data, the average error of ECD calculation model and well bore temperature field calculation model for deep-water shallow drilling is less than 8%; Second, it is calculated that the range of hydrate formation area in the well bore gradually decreases with the increase of drilling depth, but there is still a risk of hydrate formation in the well bore during drilling preparation and early drilling; Third, the conventional semi preventive drilling fluid system is optimized as HEM+14%NaCl+6%KCl, which can meet the operation requirements during normal drilling. It is concluded that through the optimization of deep water shallow drilling fluid system, the addition of hydrate inhibitor can be reduced, the drilling fluid formula can be simplified, the drilling cost can be reduced, and the operation efficiency can be improved, which can provide guidance for the drilling fluid design of deep water oil and gas drilling.

     

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