Volume 40 Issue 2
Mar.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(2): 202-208
LIU Bo, GAO Long, CHEN Mingyong, et al.Study and application of a new environmentally friendly drilling fluid in through-casing sidetrack drilling[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：202-208 doi: 10.12358/j.issn.1001-5620.2023.02.008
Citation: LIU Bo, GAO Long, CHEN Mingyong, et al.Study and application of a new environmentally friendly drilling fluid in through-casing sidetrack drilling[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：202-208 doi: 10.12358/j.issn.1001-5620.2023.02.008
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Study and Application of a New Environmentally Friendly Drilling Fluid in Through-Casing Sidetrack Drilling

doi: 10.12358/j.issn.1001-5620.2023.02.008

  • CCDC Changqing General Drilling Company of CNPC, Xi’an, Shaanxi 710000

  • Received Date: 2022-10-10
  • Rev Recd Date: 2022-12-28
  • Publish Date: 2023-03-30
    Abstract
  • Several problems have been encountered in the development of the Sulige gas field, for example, the caving and sloughing of the hard and brittle mudstones of the Shuangshi formation of the Permian system, borehole instability of the black mudstones as well as difficulties in exerting weight to the bit in horizontal slide drilling, to name but three. Environmental protection requirements have limited the use of conventional shale inhibitors. In previous drilling operation, long time reaming, sidetracking after plugging the abandoned hole have been the norm for some time. To deal with these problems, an environmentally friendly cellulose shale inhibitor CQYJZ-3 was developed through chemical modification of a hemicellulose derivative, and an environmentally friendly drilling fluid named HCG-1, which is suitable for through-casing sidetracking of horizontal wells in Sulige gas field, was developed. Laboratory experimental results show that HCG-1 drilling fluid has stable rheology and good properties such as inhibitive capacity, lubricity, contamination resistance and corrosion inhibition. It is a non-toxic easy-to-degrade drilling fluid. This drilling fluid has been successfully used on 10 wells in the Sulige gas field. Field operation showed that HCG-1 had stable properties, good inhibitive capacity and lubricity. Wireline logging was successful at the first try. No downhole troubles were encountered during drilling. The HCG-1 drilling fluid can be also recovered for re-use. Good application achievements were obtained with the use of the HCG-1 in the Sulige gas field.

     

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