Volume 34 Issue 6
Nov.  2017
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YUAN Zhongtao, YANG Mou, AI Zhengqing, WANG Yao, ZHANG Changduo, ZHANG Xin. Risk Evaluation of Cementing Job Quality of Wells Drilled in Kuche Piedmont Structure[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(6): 89-94. doi: 10.3969/j.issn.1001-5620.2017.06.017
Citation: YUAN Zhongtao, YANG Mou, AI Zhengqing, WANG Yao, ZHANG Changduo, ZHANG Xin. Risk Evaluation of Cementing Job Quality of Wells Drilled in Kuche Piedmont Structure[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(6): 89-94. doi: 10.3969/j.issn.1001-5620.2017.06.017

Risk Evaluation of Cementing Job Quality of Wells Drilled in Kuche Piedmont Structure

doi: 10.3969/j.issn.1001-5620.2017.06.017
  • Received Date: 2017-08-18
  • Publish Date: 2017-11-30
  • The Kuche piedmont structure in Tarim Basin is abundant in oil and gas which, unfortunately, are buried at depth of about 7 000 m. Oil base muds can be used to overcome the drilling challenges such as salt and gypsum contamination, borehole instability through mudstone and shale formations. On the other hand, oil base muds negatively affect the bonding between set cement and borehole wall, and the bonding between set cement and casing string. To minimize these negative effects, researches were conducted based on the data from drilled wells to systematically analyze the main factors affecting well cementing job quality from several aspects, i.e., wettability reversion on liquid-solid interface, flow rate to increase displacement efficiency while avoiding lost circulation, compatibility between drilling fluid in hole and cement slurry, as well as the placement of centralizers along casing string. The research work showed that percentage of surfactants/water in spacer fluid above 30% makes the interfaces (cement sheath-casing string and cement sheathborehole wall) water wet. Flow rates enough to realize plug flow while lost circulation is avoided help increase displacement efficiency. One centralize every two singles of casing ensures that casing centricity is greater than 67%. It can be concluded that poor cementing job quality in some wells is resulted from poor casing centricity and poor compatibility of cement slurry with drilling fluid in hole. This study provides a feasible and reliable method and basis for the enhancement of well cementing job quality in the piedmont structure.

     

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