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Application of Sidetracking in Casing in Guizhou Geothermal Drilling
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111 Geological Brigade of Bureau of Geology and Mineral Exploration and Development Guizhou Province,112 Geological Brigade of Bureau of Geology and Mineral Exploration and Development Guizhou Province,112 Geological Brigade of Bureau of Geology and Mineral Exploration and Development Guizhou Province,111 Geological Brigade of Bureau of Geology and Mineral Exploration and Development Guizhou Province,111 Geological Brigade of Bureau of Geology and Mineral Exploration and Development Guizhou Province,112 Geological Brigade of Bureau of Geology and Mineral Exploration and Development Guizhou Province

Clc Number:

TE243 .9；TE249

Fund Project:

Social development of Guizhou Province scientific and technological project "Guizhou complex formation of deep well drilling technology research and application" (number: Guizhou, SY [2015]3002); application research project supported by Guizhou Provincial Bureau of Geology and mineral geological research funds double wall drill DTH hammer reverse circulation drilling technology in Guizhou local geothermal wells "(number: Guizhou Department of Geology and mineral resources) [2017]01

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    Abstract:

    Sticking accident happened at the drilling depth of 907.91m in Jiangxipo geothermal well, back-off was used after releasing failed, the remainded 75.53m drilling tool could not be taken out and the top end of the drilling tool was at the depth of 832.38m. It is necessary to adopt sidetracking to bypass the top end of the drilling tool for continue drilling. In the case of casing cementing completion, sidetracking window from inside casing was carried out with DXQ210/H type deflecting device selected as the deflecting tool and KCXZ216 type taper miller as milling tool. Based on the analysis on the general situation of the accident, the paper introduces the working principle of the deflecting device and the technical scheme of sidetracking window from inside the case and summarizes the attentions in the construction operation. The sidetracking is smoothly completed at the depth of 2364.56m.

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History
  • Received:February 01,2018
  • Revised:June 19,2018
  • Adopted:June 26,2018
  • Online: August 07,2018
  • Published:
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