Volume 35 Issue 4
Jul.  2018
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ZHANG Hua, DING Zhiwei, XIAO Zhenhua, YU Yongjin, GUO Yuchao, YANG Qixiang, CHENG Dawei. Liner Cementing in Ultra-deep Wells with Narrow Drilling Window and Small Annular Clearance[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 87-91,96. doi: 10.3969/j.issn.1001-5620.2018.04.016
Citation: ZHANG Hua, DING Zhiwei, XIAO Zhenhua, YU Yongjin, GUO Yuchao, YANG Qixiang, CHENG Dawei. Liner Cementing in Ultra-deep Wells with Narrow Drilling Window and Small Annular Clearance[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 87-91,96. doi: 10.3969/j.issn.1001-5620.2018.04.016

Liner Cementing in Ultra-deep Wells with Narrow Drilling Window and Small Annular Clearance

doi: 10.3969/j.issn.1001-5620.2018.04.016
  • Received Date: 2018-05-05
  • Publish Date: 2018-07-30
  • Several difficulties have been met in cementing the φ168.3 mm liner (with hanger) in the ultra-deep well Wutan-1 in Southwest Oil and Gas Field, such as severe mud losses during drilling, deep well, high bottom hole temperature, long salt rock formation, severe contamination to the oil base mud and cement slurry used, and influence on the integrity of cement sheath by changing wellbore temperature in later-stage operations. Using low density high strength micro-expansion anti-channeling high toughness cement slurry with optimized column structure, the dynamic ECD at the bottom of the hole during cementing was maintained at almost the same level of the dynamic ECD at the bottom of the hole during drilling. These measures effectively prevented wellbore fluid losses from happening during well cementing, and minimized contamination to the cement slurry and the oil base drilling fluid. The job quality of cementing was 100% certified, and 99.8% of the job with high quality. This technology has provided technical support to cementing deep wells with narrow drilling windows and drilled with oil base drilling fluid.

     

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