Volume 42 Issue 6
Dec.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(6): 764-771
LIU Yingbiao, RONG Kesheng, YANG Ze, et al.Technologies for lost circulation control in deep coalbed methane drilling in the east of the Junggar basin[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：764-771 doi: 10.12358/j.issn.1001-5620.2025.06.008
Citation: LIU Yingbiao, RONG Kesheng, YANG Ze, et al.Technologies for lost circulation control in deep coalbed methane drilling in the east of the Junggar basin[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：764-771 doi: 10.12358/j.issn.1001-5620.2025.06.008
shu

Technologies for Lost Circulation Control in Deep Coalbed Methane Drilling in the East of the Junggar Basin

doi: 10.12358/j.issn.1001-5620.2025.06.008
  • 1.

    Engineering and Technology Research Institute, PetroChina Company Limited Xinjiang Oilfield Branch, Karamay, Xinjiang 834000

  • 2.

    School of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249

  • 3.

    China University of Petroleum (Beijing) Karamay Campus, Karamay, Xinjiang 834000

  • Received Date: 2025-07-02
  • Rev Recd Date: 2025-08-13
    • Available Online: 2025-12-08
  • Publish Date: 2025-12-08
    Abstract
  • Lost circulation in reservoir drilling has been encountered in deep coalbed methane drilling in the east of Junggar Basin (Xinjiang) because the reservoir formations have insufficient pressure bearing capacity. Based on the characteristics of the lost circulation encountered, the mineral composition of the reservoir formations was analyzed and the morphology of the formations observed using SEM. The mechanisms of lost circulation were determined to be the extension of fractures and the connection of pores in the formations, and a countermeasure for overcoming the lost circulation problem was presented as the synergistic application of “plugging agent + filtration agent + shale inhibitor”. Based on the “reduce costs and increase efficiency” principle, the concentrations of the key drilling fluid additives were optimized. The key additives were then formulated through orthogonal experiment with the basic slurry to form four lost circulation prevention drilling fluids. The four drilling fluids were then tested for their performance in permeability recovery and based on the results, a drilling fluid with the best reservoir protection was determined. Experimental results show that this drilling fluid has stable rheology, the percent permeability recovery can be as high as 87.42%, the API and HTHP filtration rates are 4.16 mL and 9.52 mL, respectively, the filtration rate on sand-bed test is less than 15 mL, indicating that the drilling fluid has good plugging capacity. In inhibitive capacity experiments, the rate of swelling of drilled cuttings tested with the filtrate of the drilling fluid is only 0.96%, and the percent cuttings recovery in hot rolling test with the drilling fluid is as high as 91.6%, indicating that the drilling fluid has excellent inhibitive capacity. In field application of the optimized drilling fluid, lost circulation was mitigated, drilling time shortened, complex working conditions minimized, and reservoirs were protected more effectively. The use of the optimized drilling fluid has provided an important technical support and application reference to safe and efficient drilling of deep coalbed methane.

     

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