Volume 36 Issue 5
Oct.  2019
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LIAO Fengwu, LI Kunyu, HU Youlin, HE Fen, LI Yanjun, YUE Qiansheng. High Temperature High Density Drilling Fluid Technology for Drilling in Ying-Qiong Basin[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 570-574. doi: 10.3969/j.issn.1001-5620.2019.05.008
Citation: LIAO Fengwu, LI Kunyu, HU Youlin, HE Fen, LI Yanjun, YUE Qiansheng. High Temperature High Density Drilling Fluid Technology for Drilling in Ying-Qiong Basin[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 570-574. doi: 10.3969/j.issn.1001-5620.2019.05.008

High Temperature High Density Drilling Fluid Technology for Drilling in Ying-Qiong Basin

doi: 10.3969/j.issn.1001-5620.2019.05.008
  • Received Date: 2019-06-27
  • Publish Date: 2019-10-30
  • Formations in the Ying-Qiong Basin have high temperature gradient, high pressure coefficient and narrow safe drilling window. High temperature and high mud density are two key factors for drilling in this HTHP environment. A drilling fluid formulation suitable for drilling the HTHP formations has been developed recently based on the analyses and optimization of the performance of the water base drilling fluids in use. This drilling fluid, after hot rolling at 200℃ for 16 h, has viscosity of 39 mPa·s, yield point of 7 Pa, HTHP (200℃, 3 MPa) settlement factor of 0.512, HTHP filter loss of 8.6 mL, HTHP filter loss through sand bed of 14.4 mL. After contamination with 4 MPa of CO2, the properties of the mud are as follows:viscosity of 43 mPa·s, yield point of 9 MPa, API filter loss of 4.5 mL, HTHP filter loss of 13.6 mL. Laboratory study shows that the properties of this mud, such as rheology, settlement stability, HTHP filtration property, plugging capacity and resistance to acid gas (CO2) contamination are all better than those of the drilling fluids presently in use.

     

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