Volume 35 Issue 5
Sep.  2018
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CHEN Jiaxu, LI Zhaofeng, QIU Zhengsong, YANG Fang, LIU Yalong, BAO Dan. Study on Highly Acid Soluble Fibrous Lost Circulation Materials[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 41-45. doi: 10.3969/j.issn.1001-5620.2018.05.008
Citation: CHEN Jiaxu, LI Zhaofeng, QIU Zhengsong, YANG Fang, LIU Yalong, BAO Dan. Study on Highly Acid Soluble Fibrous Lost Circulation Materials[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 41-45. doi: 10.3969/j.issn.1001-5620.2018.05.008
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Study on Highly Acid Soluble Fibrous Lost Circulation Materials

doi: 10.3969/j.issn.1001-5620.2018.05.008

  • 1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580;

  • 2. Research Institute of Drilling and Production, Zhejiang Oilfeld, Hangzhou, Zhejiang 310008;

  • 3. Department of Peripheral Exploration Project, Zhejiang Oilfeld, Hangzhou, Zhejiang 310008

  • Received Date: 2018-06-20
  • Publish Date: 2018-09-30
    Abstract
  • Fibers are the main component of bridging lost circulation material (LCM) frequently used in dealing with drilling/drill-in fluid losses into fractured reservoir formations. Fibers commonly used in LCM slurries have low acid solubility, which does not satisfy the needs of acid stimulation of the fractured reservoir. A highly acid soluble fber LCM, SDSF, has been developed to resolve this problem. SDSF has average diameter between 10 μm and 30 μm, lengths between 3 mm and 12 mm, which can be adjusted based on operational requirements. Acid solubility of SDSF is about 95%, and SDSF functions normally at high temperatures up to 150℃. SDSF disperses very well in water base drilling fluids, and is resistant to the attack of bases. Fibrous LCM slurries suitable for controlling mud losses into wedge-shaped fractures of different opening widths were optimized using SDSF and other highly acid soluble particle bridging agents. The maximum pressure bearing capacity of these LCM slurries is 10 MPa. Lost circulation control with highly acid soluble fbrous LCM can be used as an effective technical means of resolving problems such as drill-in fluid losses into reservoir formations and removal of formation block by LCM particles.

     

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