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Preparation of Adhesive Lost Circulation Control Agent and Its Application in Drilling Fluids

Yanjie Yang

Environment and Resource / 2026,8(2):  / 2026-04-29 19 14

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• Information:

  College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing

• Keywords:
  Drilling fluid lost circulation prevention and control; Adhesion; Lost circulation control; Plugging
• Abstract: Aiming at the problems of traditional lost circulation materials (LCMs) in oil and gas drilling, such as poor particle size matching, low pressure-bearing capacity, and easy repeated lost circulation, an adhesive material CK-SHeal containing disulfide bonds and hydrogen bonds was constructed based on the principle of dynamic reversible disulfide bond exchange, using polytetrahydrofuran and diphenylmethane diisocyanate (MDI) as main raw materials and introducing dimethyl disulfide (DMDS). The CK-SHeal was crushed into 6-80 mesh particles and compounded with elastic particles, rigid particles, etc., to prepare an adhesive lost circulation control agent for drilling. The comprehensive properties of the LCM were investigated through microstructure characterization, rheological and filtration performance tests, plugging performance tests, and healing performance tests. The results show that as the particle size of the adhesive material decreases, the apparent viscosity (AV) and plastic viscosity (PV) of the drilling fluid increase monotonically, which can maintain the fluidity of the drilling fluid and enhance the viscosity-increasing plugging effect; after shearing, splicing and curing at 80 ℃ for 12 h, the healing rate of the material reaches 72.7%, and the SEM images show that the cracks are significantly closed, with the dynamic exchange of disulfide bonds and reversible reconstruction of hydrogen bonds as the core repair mechanism; in the medium-temperature and medium-pressure sand bed filtration test, the system achieves a minimum sand bed penetration depth of 8.5 cm with no filtrate outflow, and the filtration loss reduction rate for micropores is ≥ 63.2%. This while-drilling LCM breaks through the limitation of particle size matching, is compatible with various mud systems, can realize adhesive plugging while drilling, effectively improves the success rate of one-time lost circulation control, and has important engineering significance for efficient treatment of lost circulation, reservoir protection, and improvement of oil and gas drilling efficiency.
• DOI: 10.35534/er.08020xx (registering DOI)
• Cite: Yang, Y. J. (2026). Preparation of Adhesive Lost Circulation Control Agent and Its Application in Drilling Fluids. Environment and Resource, 8(2)