Schlumberger Technology Corporation

Trevor Munk

Erik B Nelson

Roger Keese

Raafat Abbas

Benoit Vidick

A method of preventing or treating lost circulation during the drilling of a well comprises the addition, at concentration ranging between about 0.5 and 6 pounds per barrel, of water-dispersible fibers having a length between about 10 and 25 mm, for instance glass or polymer fibers, to a pumped aqueous base-fluid including solid particles having an equivalent diameter of less than 300 &#x3bc;m. The base-fluid with the solid particles can be the drilling fluid or a small-volume pill specially pumped for curing lost circulation.

Well treating method to prevent or cure lost-circulation

A method of preventing or treating lost circulation during the drilling of a well comprises the addition, at concentration ranging between about 0.5 and 6 pounds per barrel, of water-dispersible fibers having a length between about 10 and 25 mm, for instance glass or polymer fibers, to a pumped aqueous base-fluid including solid particles having an equivalent diameter of less than 300 &#x3bc;m The base-fluid with the solid particles can be the drilling fluid or a small-volume pill specially pumped for curing lost circulation.

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Calgary, Canada

Trevor Munk