Volume 37 Issue 3
Jun.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(3): 345-350
YANG Yuhao, Wang Chenglong, HAN Cheng, WU Jiang, LI Wentuo, ZHANG Wandong. Running Suspended Cement Plug to Temporarily Isolate Reservoir in an Offshore HTHP Horizontal Gas Well[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(3): 345-350. doi: 10.3969/j.issn.1001-5620.2020.03.013
Citation: YANG Yuhao, Wang Chenglong, HAN Cheng, WU Jiang, LI Wentuo, ZHANG Wandong. Running Suspended Cement Plug to Temporarily Isolate Reservoir in an Offshore HTHP Horizontal Gas Well[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(3): 345-350. doi: 10.3969/j.issn.1001-5620.2020.03.013
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Running Suspended Cement Plug to Temporarily Isolate Reservoir in an Offshore HTHP Horizontal Gas Well

doi: 10.3969/j.issn.1001-5620.2020.03.013

  • CNOOC China Limited Zhanjiang Branch, Zhanjiang, Guangdong, 524057

  • Received Date: 2020-01-09
  • Publish Date: 2020-06-28
    Abstract
  • Suspended cement plug was run in a high temperature high pressure (HTHP) horizontal well in the west of South China Sea to temporarily isolate the HTHP reservoir. The cement plug was required to run in the highly deviated HTHP hole section, the bottom of which was only 150 m (MD) or 40 m (TVD) away from the reservoir penetrated by a horizontal slim hole section. Caution should be taken to prevent slurry channeling and loss during injection of cement slurry because of pressure fluctuation on the bottom of the hole. Cement plug run into a well drilled with high density oil base mud makes mud cake cleaning very difficult and the quality of cementation is thus reduced. If low volume of cement slurry is used, the cement slurry is easy to get contaminated by drilling fluid. Several measures were taken to avoid these problems, such as converting the drilling fluid in advance, optimizing pipe structure for slurry injection, increasing the support capacity of the cement plug, optimizing the prepad fluid, cement slurry composition and surplus volume of cement slurry, improving displacing efficiency, optimizing volume of displacement and technique of displacement and using new technology of cleaning the internal pipe wall of the cementing slurry injection string etc. With these measures, a set of technology for running suspended cement plug in offshore HTHP horizontal gas well to isolate reservoir was presented. This technology has been successfully applied on 7 HTHP horizontal wells drilled in the Ying-Qiong basin, west of South China Sea, providing a technical reference for running suspended cement plug in HTHP highly deviated holes drilled with high density oil base mud.

     

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