Volume 37 Issue 4
Aug.  2020
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YANG Yifan, QIU Zhengsong, LI Jia, ZHAO Xin, ZHONG Hanyi, LIU Shujie, XING Xijin, FENG Huanzhi. Technology Drilling Fluid for Protecting High Temperature Deep Buried Hill Gas Reservoirs in Bozhong 19-6 block[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(4): 476-481. doi: 10.3969/j.issn.1001-5620.2020.04.012
Citation: YANG Yifan, QIU Zhengsong, LI Jia, ZHAO Xin, ZHONG Hanyi, LIU Shujie, XING Xijin, FENG Huanzhi. Technology Drilling Fluid for Protecting High Temperature Deep Buried Hill Gas Reservoirs in Bozhong 19-6 block[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(4): 476-481. doi: 10.3969/j.issn.1001-5620.2020.04.012

Technology Drilling Fluid for Protecting High Temperature Deep Buried Hill Gas Reservoirs in Bozhong 19-6 block

doi: 10.3969/j.issn.1001-5620.2020.04.012
  • Received Date: 2020-04-26
  • Publish Date: 2020-08-28
  • To avoid formation damage to the high temperature deep buried hill gas reservoir in Bozhong 19-6 block, a high temperature water base drilling fluid with good overall performance was developed based on rock core analysis, permeability sensitivity experiment and analysis on the mechanisms of reservoir damage. Laboratory experimental results showed that the matrix of the gas reservoir in Bozhong 19-6 block has low porosity and low permeability. The reservoir rocks have low content of clay and are full of fractures. Laboratory experiments also showed that the reservoir rocks have strong flow rate sensitivity, medium to low stress sensitivity, and weak water, salt and alkali sensitivity. No acid sensitivity was found during laboratory experiment. The reservoir rocks are easily damaged by solids invasion because of the micro fractures developed therein. Loose cementation of particles in the micro fractures results in flow rate sensitivity and water block of the reservoir rocks. Cores flooded with the drilling fluid developed had percent permeability recovery of 85.95% and percent water block damage of 13.21%, indicating that the drilling fluid had excellent reservoir protection capacity. After being aged at 210 ℃ or contaminated with 10% NaCl, 1% CaCl2 or 8% poor quality clay, the drilling fluid still functioned properly, satisfying the requirements of gas reservoir drilling and reservoir protection in the Bozhong 19-6 block.

     

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