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AssigneesInstitut Francais du Petrole, Dowell Schlumberger Incorporated
InventorsAnnie Audibert, Jean-Francois Argillier, Louise Bailey, Paul I. Reid
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The present invention relates to a process used in a well for controlling the filtration of a drilling, a completion or a workover fluid set in a well. The process comprises adding a predetermined amount of at least one hydrophobically modified cellulose derivative. In a variant of the invention, the cellulose derivative is a hydrophobically modified hydroxyethylcellulose. The invention further relates to a drilling, a completion or a workover fluid including at least one hydrophobically modified cellulose derivative, for example hydrophobically modified hydroxyethylcellulose and notably viscosifiers such as polymers or reactive clay.
A process for controlling the permeability of the walls of a well drilled through at least one geologic formation, comprising adding a predetermined amount of at least one water-soluble hydrophobically modified cellulose derivative to a volume of water-base fluid employed in the well during well drilling, well completion or well workover.
A process for controlling the permeability of the walls of a well drilled through at least one water-soluble geologic formation comprising adding a predetermined amount of at least one hydrophobically modified cellulose derivative to a volume of water-based fluid employed in the well during well drilling, well completion or well workover, wherein said hydrophobically modified cellulose derivative is employed in an essentially solid-free fluid.
A process for controlling the permeability of the walls of a well drilled through at least one geologic formation, comprising adding a predetermined amount of at least one water-soluble hydrophobically modified cellulose derivative to a volume of water-based well-drilling fluid, well-completion fluid or well workover fluid injected into said well.
Dependencies are inferred from the claim text.