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Wu X.,Project Management of Thailand | Yuan O.,Project Management of Thailand | Zheng L.,Project Management of Thailand | Li Z.,Project Management of Thailand | And 4 more authors.
Drilling Fluid and Completion Fluid | Year: 2011

The well BKN-1 is a directional exploration well with total depth of 4,300 m, and some difficulties were encountered when drilling, such as high geothermal gradient, long open hole, hydratable formations, tight hole, differential pressure sticking and caving. The application of the amphion polysulfnate silicofluoride drilling fluid in this well shows that it can be used at 180-200 °C, and the pH value must be kept at 9 that is the key to keep borehole stable and good rheology even with high bentonite content.

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