Volume 38 Issue 6
Nov.  2021
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QIU Zhengsong, ZHAO Chong, ZHANG Xianbin, et al.Study and performance evaluation of ultra-high temperature high density oil based drilling fluids[J]. Drilling Fluid & Completion Fluid,2021, 38(6):663-670 doi: 10.12358/j.issn.1001-5620.2021.06.001
Citation: QIU Zhengsong, ZHAO Chong, ZHANG Xianbin, et al.Study and performance evaluation of ultra-high temperature high density oil based drilling fluids[J]. Drilling Fluid & Completion Fluid,2021, 38(6):663-670 doi: 10.12358/j.issn.1001-5620.2021.06.001

Study and Performance Evaluation of Ultra-High Temperature High Density Oil Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2021.06.001
  • Received Date: 2021-08-20
    Available Online: 2021-11-30
  • Publish Date: 2021-11-30
  • Difficulties in controlling the emulsion stability, rheology and filtration property of the oil based drilling fluids are often encountered in drilling deep and ultra-deep wells in which high temperatures, high pressure formations and salt-waters, thick salt and gypsum zones and shale formations are penetrated. To deal with these problems, an ultra-high temperature high density oil based drilling fluid was formulated with synthesized emulsifiers, high temperature viscosifier, flow pattern additive, wetting agent, filter loss reducer and ultra-fine barite. The emulsifiers are an imidazoline amide with tall oil aliphatic hydrocarbon group grafted with unsaturated anhydride. Laboratory evaluation of the drilling fluid demonstrated that this drilling fluid can work normally at temperatures up to 220 ℃. The density of the drilling fluid can be weighted to 2.8 g/cm3. Using compounded weighting agents significantly improved the rheology of the drilling fluid. This drilling fluid is able to resist to contamination from 40% fresh water, or 40% compound salt water, or 5% – 10% shale cuttings, or 5% – 10% gypsum. The drilling fluid had good rheological stability and suspending stability at 65 ℃/atmospheric pressure to 220 ℃/172.5 MPa. This ultra-high temperature high density oil based drilling fluid has provided a technical support to the safe and efficient development of deep and ultra-deep buried oil and gas resources.

     

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