Chen Tiancheng. DRILLING PRACTICES IN LUNPOLA BASIN OF TIBET[J]. Oil Drilling & Production Technology, 2001, 23(5): 15-18,83. DOI: 10.3969/j.issn.1000-7393.2001.05.005
Citation: Chen Tiancheng. DRILLING PRACTICES IN LUNPOLA BASIN OF TIBET[J]. Oil Drilling & Production Technology, 2001, 23(5): 15-18,83. DOI: 10.3969/j.issn.1000-7393.2001.05.005
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DRILLING PRACTICES IN LUNPOLA BASIN OF TIBET

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    • Abstract
  • Hole deviation, lost circulation and hole sloughing is very serious in Lunpola Basin of Tibet, a strike-slip tension basin of the Tertiary, which has very complicated geological conditions, and deep well drilling is especially difficult in this area. In the four deep wells that over 2200m, only well Xilun-2 is successfully drilled to TD at 2802m, while other three wells, well Zang-1 of 2334.47m, well Xilun-3 of 2362.86m and well Xilun-6 of 2286m, all encountered serious hole collapse at about 2000m. By improving the casing program and drilling technology since 1996, well Banshen-1 of 3223.32m of TD is successfully drilled.. The downhole troubles and their causes are investigated, and the corresponding solutions are illustrated.
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