Lost circulation material for oilfield use
AssigneeSchlumberger Technology Corporation
InventorJaleh Ghassemzadeh
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Abstract
A composition for reducing lost circulation in a well, while drilling the well with a drilling mud, which is composed of a base fluid, a mixture of particles, and a blend of fibers. The composition is used by stopping drilling with the mud, injecting a spacer, injecting the water-based composition, injecting a spacer, and resuming drilling with the oil-based mud.
Claims11
A water-based composition for reducing lost circulation while drilling a well with an oil-based drilling mud, the composition comprising an aqueous base fluid, a mixture of coarse, medium and optional fine particles, and a blend of long polyvinyl alcohol fibers and short inorganic fibers, wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud.
Dependencies are inferred from the claim text.