Invert Drilling Fluids with High Internal Phase Content

Sławomir Błaż, Grzegorz Zima, Bartłomiej Jasiński and Marcin Kremieniewski
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Sławomir Błaż: Oil and Gas Institute–National Research Institute, 31-503 Krakow, Poland
Grzegorz Zima: Oil and Gas Institute–National Research Institute, 31-503 Krakow, Poland
Bartłomiej Jasiński: Oil and Gas Institute–National Research Institute, 31-503 Krakow, Poland
Marcin Kremieniewski: Oil and Gas Institute–National Research Institute, 31-503 Krakow, Poland

Energies, 2021, vol. 14, issue 15, 1-14

Abstract: One of the most important tasks when drilling a borehole is to select the appropriate type of drilling fluid and adjust its properties to the borehole’s conditions. This ensures the safe and effective exploitation of the borehole. Many types of drilling fluids are used to drill holes for crude oil and natural gas. Most often, mainly due to cost and environmental constraints, water-based muds are used. On the other hand, invert drilling fluids are used for drilling holes in difficult geological conditions. The ratio of the oil phase to the water phase in invert drilling fluids the most common ratio being from 70/30 to 90/10. One of the disadvantages of invert drilling fluids is their cost (due to the oil content) and environmental problems related to waste and the management of oily cuttings. This article presents tests of invert drilling fluids with Oil-Water Ratio (OWR) 50/50 to 20/80 which can be used for drilling HPHT wells. The invert drilling fluids properties were examined and their resistance to temperature and pressure was assessed. Their effect on the permeability of reservoir rocks was also determined. The developed invert drilling fluids are characterized by high electrical stability ES above 300 V, and stable rheological parameters and low filtration. Due to the reduced content of the oil, the developed drilling fluid system is more economical and has limited toxicity.

Keywords: oil-based mud; invert drilling fluid; water phase; oil phase; emulsion stability; emulsifier (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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