ZHANG Gaobo, GAO Qinlong, MA Qianyun. Discussion on the Enhancement of the Inhibitive Capacity of Oil Base Drilling Fluids in Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 141-147. doi: 10.3969/j.issn.1001-5620.2019.02.002
Citation: ZHANG Gaobo, GAO Qinlong, MA Qianyun. Discussion on the Enhancement of the Inhibitive Capacity of Oil Base Drilling Fluids in Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 141-147. doi: 10.3969/j.issn.1001-5620.2019.02.002

Discussion on the Enhancement of the Inhibitive Capacity of Oil Base Drilling Fluids in Shale Gas Drilling

doi: 10.3969/j.issn.1001-5620.2019.02.002
  • Received Date: 2018-12-05
  • Publish Date: 2019-04-30
  • Downhole problems have been frequently encountered in horizontal shale gas drilling with oil base drilling fluids in Sichuan, China. This paper, based on the analyses of the characteristics of the shale in Longmaxi formation in Weiyuan, Sichuan, discusses how to enhance the inhibitive capacity of oil base drilling fluids in shale gas drilling from three aspects:drilling process, geology and drilling fluid, especially oil base drilling fluid. 1) Select and use, through laboratory experiment, multi-function additives to control the properties of the drilling fluid and reduce the HTHP filtration rate as many as possible. The multi-function additives should have these functions such as emulsifying and filtration reducing, increasing viscosity and gel strength while emulsifying the drilling fluid, plugging formation pores while reducing filtration rate. 2) Use oil base drilling fluids with oil/water ratios between 85:15 and 95:5. 3) Use plugging technique and pay attention to the change of rheology, mainly the increase in funnel viscosity, gel strength and yield point, and plastic viscosity. 4) Increase the activity of water phase by using potassium formate in the water phase, or further increasing the concentration of CaCl2 in the water phase. 5) Use potassium formate or CaCl2 with inhibitive intercalation agents such as amine, to improve the inhibitive capacity of the filtrates of oil base drilling fluids.

     

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