Variable density drilling mud

One embodiment of the invention is a variable density drilling mud comprising compressible particulate material in the drilling mud wherein the density of the drilling mud changes in response to pressure changes at depth. A second embodiment is a method for varying drilling mud density. The method c...

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Main Author POLIZZOTTI RICHARD S.,ERTAS MEHMET D.,POKUTYLOWICZ NORMAN M.,MILNER SCOTT T.,RIGBY JAMES R.,MONTGOMERY JOHN,ENTCHEV PAVLIN B.,KELLER STUART R.,GUPTA VISHWAS,SISAK WILLIAM J
Format Patent
LanguageEnglish
Published 06.06.2007
Subjects
ADHESIVES
CHEMISTRY
DYES
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
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Summary:One embodiment of the invention is a variable density drilling mud comprising compressible particulate material in the drilling mud wherein the density of the drilling mud changes in response to pressure changes at depth. A second embodiment is a method for varying drilling mud density. The method comprises estimating the pore pressure and fracture gradient, and choosing a drilling mud with compressible materials wherein the effective mud weight of the drilling mud remains between the pore pressure and the fracture gradient in at least one interval of the well bore. A third embodiment is an apparatus for drilling a wellbore.
Bibliography:Application Number: CN200580020213