Volume 38 Issue 1
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CHEN Bin, ZHOU Shanshan, ZHAO Yuanyuan, QIN Jianyu, RAO Zhihua, DI Mingli, ZUO Kun. Laboratory Study on New Water Base Drilling Fluid for Extended Reach Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(1): 42-46. doi: 10.3969/j.issn.1001-5620.2021.01.007
Citation: CHEN Bin, ZHOU Shanshan, ZHAO Yuanyuan, QIN Jianyu, RAO Zhihua, DI Mingli, ZUO Kun. Laboratory Study on New Water Base Drilling Fluid for Extended Reach Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(1): 42-46. doi: 10.3969/j.issn.1001-5620.2021.01.007
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Laboratory Study on New Water Base Drilling Fluid for Extended Reach Wells

doi: 10.3969/j.issn.1001-5620.2021.01.007

  • 1. Shenzhen Branch of CNOOC (China) Co., Ltd., Shenzhen, Guangdong 518067;

  • 2. Jingzhou Jiahua Technology Co., Ltd., Jingzhou, Hubei 434000;

  • 3 Shenzhen Operation Company of Oilfield Chemical Division of COSL, Shenzhen, Guangdong 518067

  • Received Date: 2020-10-16
    Available Online: 2021-08-16
    Abstract
  • A new water base drilling fluid was formulated to satisfy the needs of extended well drilling. Optimization was done to the lubricity, friction, torque and the control of the equivalent density of the drilling fluid. By adding a multi-function base fluid MBF into the drilling fluid, the lubricity of the drilling fluid can be improved to a level that is equivalent to oil base drilling fluids. Comparison of the new water base drilling fluid with conventional water base drilling fluids and oil base drilling fluids showed that the friction coefficient of the new drilling fluid treated with 30% MBF was 0.064, lower than the friction coefficient of conventional KCl polymer drilling fluid, which was 0.123, and close to the friction coefficient of an oil base drilling fluid, which was 0.056. This new drilling fluid is able to effectively inhibit the yield of clays, and has better filtration control capacity; its low HTHP filtration rate is close to that of oil base drilling fluids. The new water base drilling fluid formulated can be used to replace oil base drilling fluids in drilling extended wells.

     

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