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US 5,330,015 AGranted
Application of scleroglucan muds to drilling deviated wells
AssigneeSociete Nationale Elf Aquitaine
InventorsAlain Donche, Alain Vaussard, Patrick Isambourg
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Abstract
A method for drilling deviated or horizontal wells is facilitated by the use of a scleroglucan-containing aqueous drilling mud. The use of such drilling muds is environmentally and economically advantageous over the use of oil-based drilling muds and is superior to the use of other aqueous-based drilling muds in terms of lubricating power and carrying capacity. Preferably the drilling mud contains unrefined scieroglucan.
Claims8
A method of drilling deviated wells, which comprises:
- drilling a borehole at an angle greater than 0.degree. and less than or equal to 90.degree., with respect to vertical, in the presence of a water-based drilling mud;
- said mud comprising water and scleroglucan.
A method of drilling deviated wells, which comprises:
- drilling a borehole into a geological formation at an angle greater than 0.degree. and less than or equal to 90.degree., with respect to the vertical, to thereby extend said borehole;
- and
- injecting into said borehole, during said drilling, a water-based drilling mud that comprises water and scleroglucan.
Dependencies are inferred from the claim text.