Volume 36 Issue 5
Oct.  2019
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LI Jiaxue, JIANG Shaobin, YAN Zhihang, HUI Haijun, CHEN Lin, CUI Changhao. Study on the Methods of Evaluating Static Sedimentation Stability of Drill-in Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 575-580. doi: 10.3969/j.issn.1001-5620.2019.05.009
Citation: LI Jiaxue, JIANG Shaobin, YAN Zhihang, HUI Haijun, CHEN Lin, CUI Changhao. Study on the Methods of Evaluating Static Sedimentation Stability of Drill-in Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 575-580. doi: 10.3969/j.issn.1001-5620.2019.05.009

Study on the Methods of Evaluating Static Sedimentation Stability of Drill-in Fluids

doi: 10.3969/j.issn.1001-5620.2019.05.009
  • Received Date: 2019-06-17
  • Publish Date: 2019-10-30
  • Serious sedimentation may take place in a drill-in fluid standing for a long period of time at elevated temperatures, resulting in resistance to running tubular goods into the hole or difficulties in starting pump. To resolve this problem, it is necessary to investigate the precipitation stability of a drill-in fluid standing motionless at elevated temperatures. Plenty of studying work has been done by researchers on this issue all over the world, and there is still no standard method for evaluating the sedimentation stability of a drill-in fluid standing motionless at elevated temperatures for a long time. In this study, nine methods used all over the world have been investigated, and four of them, which are falling-rod method, sedimentation coefficient method, penetration degree measurement and static stability stratification index method, were selected for evaluating the sedimentation stability of water base drill-in fluids. Experimental results showed that coefficient of correlation between the SSSI value (measured with the static stability stratification method) and the density of the fluid at the bottom was at least 0.97, indicating that this method is able to be used to predict accurately the sedimentation stability of a completion fluid. The penetration degree measurement method can only be used to predict the sedimentation tendency of a completion fluid, unable to quantitatively evaluate the actual sedimentation degree of the completion fluid. The sedimentation coefficient method is only suitable for evaluating the sedimentation stability of drill-in fluids with low liquid separation rates. The falling-rod method can only be used to roughly predict the sedimentation stability of a drill-in fluid.

     

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