Volume 42 Issue 3
Jun.  2025
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LIU Wentang, ZHANG Xianmin, HUANG Ning, et al.Research and application of the oil-absorbing viscous polymer for oil-based drilling fluid plugging[J]. Drilling Fluid & Completion Fluid，2025, 42（3）：338-342 doi: 10.12358/j.issn.1001-5620.2025.03.009
Citation: LIU Wentang, ZHANG Xianmin, HUANG Ning, et al.Research and application of the oil-absorbing viscous polymer for oil-based drilling fluid plugging[J]. Drilling Fluid & Completion Fluid，2025, 42（3）：338-342 doi: 10.12358/j.issn.1001-5620.2025.03.009
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Research and Application of the Oil-absorbing Viscous Polymer for Oil-Based Drilling Fluid Plugging

doi: 10.12358/j.issn.1001-5620.2025.03.009
  • 1.

    Sinopec Oil Engineering Drilling and Completion Fluid Technology Center, Puyang, Henan 457001

  • 2.

    Sinopec Zhongyuan Petroleum Engineering Co., Ltd., Drilling Engineering Technology Research Institute, Puyang, Henan 457001

  • Received Date: 2024-12-06
  • Rev Recd Date: 2025-01-28
  • Publish Date: 2025-06-12
    Abstract
  • Lost circulation materials (LCMs), after being wetted by oil-based drilling fluids, have their sliding ability decreased and retention ability increased, causing them to be easy to flow back from the fractures through which the mud is lost and circulation is lost again. Using these LCMs, the success rates of lost circulation control are low. To improve the retention ability of the LCMs and the stability of the plugging layers, an oil absorbing viscous polymer MBS was developed. MBS is mainly composed of butadiene-styrene block copolymer BS and is formed by the coupling and grafting of inorganic minerals at a temperature between 70℃ and 90℃. The rate at which MBS absorbs oil and becomes viscous is controllable. At room temperature, the oil-absorbing rate of the polymer MBS is relatively low, and the viscosity of the LCM slurry is small, making the slurry preparation and pumping very convenient. At the temperature of a lost circulation zone, the oil-absorbing rate of the polymer MBS increases, and the viscosity of the LCM slurry becomes higher, making it convenient for the LCM slurry to be retained inside the fractures through which the mud is lost. Moreover, the inorganic minerals enhance their supporting effects on the LCM slurry. MBS can absorb oils that are 2.94 times of its volume. At a concentration of 5%, the viscosity of the LCM slurry increases, and the fluidity decreases by nearly 50%. When the concentration of MBS is 10%, it can be effectively retained in a smooth fracture with a width of 2 mm, and the pressures bearing capacities in the forward and reverse directions are 0.69 MPa and 0.53 MPa respectively. An LCMs slurry formulated with MBS and other commonly used LCMs was used in the well section of 2,900-3,130 m of the well Puluye XHF. The LCMs slurry effectively stabilized the pressure at 4.2 MPa, achieving the goal of controlling lost circulation and increasing the pressure bearing capacity of the formations. The lost circulation was controlled successfully in the first try.

     

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