Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Reexamination Certificate
2011-05-31
2011-05-31
Figueroa, John J (Department: 1765)
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
C507S110000, C507S111000, C507S112000, C507S117000, C507S126000, C507S127000, C507S139000, C507S143000, C507S263000, C175S065000
Reexamination Certificate
active
07951755
ABSTRACT:
A water-based polymer drilling fluid, containing effective quantities of surfactants having HLB numbers equal to or greater than approximately 7, emulsifies oil and bitumen contained in oil sand cuttings, resulting in the oil and bitumen being dispersed into the mud as an emulsion. This eliminates or significantly reduces the ability of the oil, bitumen, and cuttings to clog the well or stick to drill string components when drilling a well through oil-bearing sands, particularly sands containing highly viscous oil or bitumen. The emulsification process separates the sand particles from the oil and bitumen, such that the sand particles can be removed when the mud is run through a conventional shale shaker or other suitable apparatus.
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Definition of “bitumen” from Schlumberger Oilfield Glossary, http://www.glossary.oilfield.slb.com/Display.cfm?Term=bitumen, 2002.
Definition of “asphalt” from Schlumberger Oilfield Glossary, http://www.glossary.oilfield.slb.com/Display.cfm?Term=asphalt, 2002.
Brockhoff Jay
Wu An-Ming
Figueroa John J
Tomkins Donald V.
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