Eastern Exploration Project Intendance of Xinjiang Petroleum Management Bureau

Shijiao, China

Eastern Exploration Project Intendance of Xinjiang Petroleum Management Bureau

Shijiao, China
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Xing P.,Eastern Exploration Project Intendance of Xinjiang Petroleum Management Bureau | Xu X.,Eastern Exploration Project Intendance of Xinjiang Petroleum Management Bureau | Zhang Q.,Eastern Exploration Project Intendance of Xinjiang Petroleum Management Bureau | Fu J.,Eastern Exploration Project Intendance of Xinjiang Petroleum Management Bureau | And 3 more authors.
Drilling Fluid and Completion Fluid | Year: 2010

Well Dongquan-2 penetrated the Quaternary, Neogene System, Cretaceous and Carboniferous formations. Borehole cave-in in the Quaternary and Neogene System formations, tight hole and sloughing of the gypsum mudstone in the upper Cretaceous formation, and lost circulation because of the presence of fractures in the Carboniferous formation were all encountered during drilling operation. Water base drilling fluid was reused because of the failure of the use of the air-foam mud in the third interval and then, to enhance the drilling rate, a ψ 215.9 mm drill bit was used in place of the φ 311 mm drill bit. Change of the well profile made the drilling and drilling fluid operations very difficult. Using an MMH fluid in the first interval, a potassium/calcium polymer fluid in the second interval, and gas-liquid conversion drilling fluid technology in the third interval, coupled with the engineered drilling fluid rheology in different intervals, the well, having a funnel-shaped hole geometry, from φ 555 mm, φ 311 mm to φ 215.9 mm hole sizes, was successfully drilled, free of downhole troubles such as borehole instability, cuttings suspension, borehole instability circulation.

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