Volume 37 Issue 5
Oct.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(5): 626-630
DONG Xiaoqiang, LI Xiong, FANG Junwei, ZHANG Guo. Laboratory Study on Static Sedimentation Stability of High-Density Drilling Fluids at High Temperatures[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 626-630. doi: 10.3969/j.issn.1001-5620.2020.05.015
Citation: DONG Xiaoqiang, LI Xiong, FANG Junwei, ZHANG Guo. Laboratory Study on Static Sedimentation Stability of High-Density Drilling Fluids at High Temperatures[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 626-630. doi: 10.3969/j.issn.1001-5620.2020.05.015
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Laboratory Study on Static Sedimentation Stability of High-Density Drilling Fluids at High Temperatures

doi: 10.3969/j.issn.1001-5620.2020.05.015

  • 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101;

  • 2. SINOPEC Research Institute of Petroleum Engineering, Beijing 100101;

  • 3. SINOPEC North-west Oilfield Corporation, Urumqi, Xinjiang 841000

  • Received Date: 2020-06-15
  • Publish Date: 2020-10-28
    Abstract
  • The sedimentation stability of a high temperature high density drilling fluid plays a key role in stabilizing the property of the drilling fluid and in the safety of well control. Using small amplitude in-situ oscillation method, in which low shearing stress and low frequency oscillation were applied to a high density drilling fluid, the viscoelastic response of the drilling fluid constituents in gel solution was observed under the condition that the associative structure of the drilling fluid was not broken down, and analyses were performed on the interaction among the additives in the drilling fluid at rest and the effect of the stress environment on the barite in the drilling fluid. Experimental results showed that drilling fluid additives, such as copolymers, sulfonates and bentonite, can develop a weak gel structure with flexible network among them through hydrophobic association and bridging. The gel solution of the highdensity drilling fluid generally exhibits viscous characteristics. indicating that interaction among clay, sulfonate and copolymer in a high-density drilling fluid at elevated temperatures effectively hinders the sedimentation of barite, thereby improving the sedimentation stability of barite.

     

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