Volume 35 Issue 5
Sep.  2018
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GONG Yongfeng. Drilling Fluid Formulation for Oil Sand SAGD Horizontal Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 72-77. doi: 10.3969/j.issn.1001-5620.2018.05.014
Citation: GONG Yongfeng. Drilling Fluid Formulation for Oil Sand SAGD Horizontal Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 72-77. doi: 10.3969/j.issn.1001-5620.2018.05.014

Drilling Fluid Formulation for Oil Sand SAGD Horizontal Wells

doi: 10.3969/j.issn.1001-5620.2018.05.014
  • Received Date: 2018-07-13
  • Publish Date: 2018-09-30
  • Wellbore instability, inability to exert weight-on-bit and adhesion of asphalt on drilling tools and solid control equipments are diffcult problems associated with SAGD (steam-assisted gravity drainage) horizontal drilling. A water base drilling fluid with high inhibitive capacity and good lubricity has been formulated, based on additive selection through laboratory experiment, to resolve these diffcult problems. This drilling fluid in laboratory experiment showed good properties, such as high temperature resistance (180℃), resistance to contamination caused by 20% asphalt and by 25% drilled cuttings, and percent cuttings recovery of 91.7% in hot rolling test. The lubricity of the drilling fluid is equivalent to that of oil base mud. This drilling fluid was used on 10 SAGD horizontal wells in Block Maikaihe, showing stable and easy-to-control properties, and good lubricity. High ROP was obtained with the use of the formulation. Ho downhole troubles have ever been encountered during drilling. This water base drilling fluid of strong inhibitive capacity and good lubricity fully satisfed the needs of shallow oil sand SAGD horizontal well drilling, and is worth spreading.

     

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