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• W2901889764 abstract "The co-exploitation of coal measure gases (CMG) in coal measure strata put forward higher requirements on water-based drilling fluid (WBDF). Among these reservoir rocks, it is well-known that coal rocks and shales are strata subject to wellbore instability problems. In this study, mixed metal hydroxide (MMH) was used to inhibit the hydration of clay minerals in coal rock and shale. Meanwhile, compound surfactants were employed to enhance the hydrophobicity of reservoir rocks, thus decreased the chance of drilling fluid-rock interaction and improved wellbore stability of coal measure strata. The influence of inorganic MMH and compound surfactants on the properties of WBDF was studied and an optimized WBDF based on electrical inhibition and wettability control (EW-WBDF) was proposed. Comprehensive evaluation on the properties of the EW-WBDF and its capability to enhance the wellbore stability of coal measure strata was conducted. Results manifested that inorganic MMH had excellent inhibitive performance. On the other hand, the contact angles of compound surfactants solution with coal rock and shale were up to 102° and 91°, respectively, which indicated that the compound surfactants could enhance the hydrophobicity of coal rocks and shale effectively. Further pore pressure transmission tests showed that, compared with fresh water, the compound surfactants and inorganic MMH could significantly retard the pore pressure transmission speed in coal rocks and shale, and decreased the permeability of rocks with a rate up to 99%. The contact angles of the EW-WBDF with coal rock and shale were 77.5° and 66.5°, respectively. The EW-WBDF had excellent inhibition performance to clay minerals and salt resistance capability which could resist the contamination of 1% CaCl2, 1% MgCl2, 5% NaCl, and 5% attapulgite respectively, at ambient temperature and 80 °C. More importantly, as a drill-in fluid, it showed a very low formation damage rate (3.8%) to the original coal rock, while the damage rate of common WBDF to coal rock was 36%. This study provides a guideline for the design of WBDF in the co-exploitation of CMG in coal measure strata." @default.
• W2901889764 created "2018-11-29" @default.
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• W2901889764 date "2019-03-01" @default.
• W2901889764 modified "2023-09-27" @default.
• W2901889764 title "Enhancing wellbore stability of coal measure strata by electrical inhibition and wettability control" @default.
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• W2901889764 doi "https://doi.org/10.1016/j.petrol.2018.11.052" @default.
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