Volume 36 Issue 5
Oct.  2019
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LI Ying, TAN Xianfeng, HAN Weichao, LI Kaijun, GUO Mingyi. Laboratory Study on Water Base Filming Drilling Fluid Resistant to 240℃[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 548-554. doi: 10.3969/j.issn.1001-5620.2019.05.004
Citation: LI Ying, TAN Xianfeng, HAN Weichao, LI Kaijun, GUO Mingyi. Laboratory Study on Water Base Filming Drilling Fluid Resistant to 240℃[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 548-554. doi: 10.3969/j.issn.1001-5620.2019.05.004

Laboratory Study on Water Base Filming Drilling Fluid Resistant to 240℃

doi: 10.3969/j.issn.1001-5620.2019.05.004
  • Received Date: 2019-05-29
  • Publish Date: 2019-10-30
  • A water base filming drilling fluid has been developed to deal with problems encountered in deep well drilling, such as borehole wall instability, rheology fluctuation and high filtration rate. The drilling fluid, which is formulated with an inorganic filming agent and an organic filming additive, is resistant to high temperatures to 240℃. The drilling fluid was formulated through orthogonal experiment. The filming performance, inhibitive capacity, rheology and filtration rate etc. of the drilling fluid were studied using optical microscope, hot rolling test, mud ball soaking test, HTHP filtration test, particle size analysis, SEM, as well as the observation of the micro morphology of mud cakes. These studies in turn helped optimize the properties of drilling fluid. The experimental results showed that at 240℃, the drilling fluid had stable rheology, suitable yield point, low filtration rate (API filter loss after aging at 240℃ was 5.6 mL, and HTHP filter loss at 200℃ was 14 mL), thin mud cake, good filming performance and superior inhibitive capacity and plugging ability, indicating that this drilling fluid will find wide application in deep well drilling and high temperature geothermal well drilling.

     

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