Volume 37 Issue 5
Oct.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(5): 550-554,560
WANG Xingyuan, LU Dengyun, WU Zhengliang. Study and Application of a High Density Oil Base Drilling Fluid with High Temperature Resistance of 220℃[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 550-554,560. doi: 10.3969/j.issn.1001-5620.2020.05.002
Citation: WANG Xingyuan, LU Dengyun, WU Zhengliang. Study and Application of a High Density Oil Base Drilling Fluid with High Temperature Resistance of 220℃[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 550-554,560. doi: 10.3969/j.issn.1001-5620.2020.05.002
shu

Study and Application of a High Density Oil Base Drilling Fluid with High Temperature Resistance of 220℃

doi: 10.3969/j.issn.1001-5620.2020.05.002

  • 1. Key Laboratory of Oil and Gas Field Applied Chemistry(Sichuan Province), Guanghan, Sichuan 618300;

  • 2. Drilling and Production Technology Research Institute, Chuanqing Drilling and Exploration Engineering Company, Ltd., CNPC, Guanghan, Sichuan 618300

  • Received Date: 2020-04-26
  • Publish Date: 2020-10-28
    Abstract
  • Most drilling fluids have various disadvantages such as low temperature stability, low density and poor circulating suspending capacity when used to drill ultra-high temperature deep and ultra-deep wells. An oil base drilling fluid with the highest density of 2.30 g/cm3 has been developed to solve these problems. The drilling fluid was formulated with newly developed emulsifiers, viscosifier and thinner with high temperature resistance of 200℃. Laboratory evaluation showed that the ultra-high temperature emulsifiers SD-HTPE and SD-HTSE have little effect on the rheology of the drilling fluid. After hot rolling at 220℃, the emulsion stability of the drilling fluid was 1201-1856 V. The ultra-high temperature viscosifier SD-OIV can increase the LSRYP from 3 Pa to 13 Pa and the dynamic settlement index from 0.2096 to 0.6466. HTHP filter loss of the drilling fluid can be reduced by 76.74%. The ultra-high temperature thinner SD-ORV can reduce the LSRYP of the drilling fluid by 85.71%. The drilling fluid had good dynamic circulating rheology and thermal stability at 220℃, 40 MPa and low shear rates. Application of this drilling fluid in Well Tatan-1 in south Sichuan showed that the ultra-high temperature high density oil base drilling fluid had good thermal stability, rheology, settlement stability and HTHP filter loss at 214℃. No tight spots and drag were encountered during drilling, and tripping was conducted smoothly. Field application of this drilling fluid proved that it satisfied the requirements of drilling ultra-high temperature deep and ultra-deep wells.

     

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