AN INVERT EMULSION DRILLING FLUID CONTAINING A HYGROSCOPIC LIQUID AND A POLYMERIC SUSPENDING AGENT

AN INVERT EMULSION DRILLING FLUID CONTAINING A HYGROSCOPIC LIQUID AND A POLYMERIC SUSPENDING AGENT

An invert emulsion drilling fluid. The fluid comprises an external phase and an internal phase. The external phase comprises a hydrocarbon liquid and the internal phase comprises a hygroscopic liquid. The hygroscopic liquid is selected such that the drilling fluid has an activity less than or equal...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MAGHRABI, SHADAAB S, WAGLE, VIKRANT B
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
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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Beschreibung
Zusammenfassung:An invert emulsion drilling fluid. The fluid comprises an external phase and an internal phase. The external phase comprises a hydrocarbon liquid and the internal phase comprises a hygroscopic liquid. The hygroscopic liquid is selected such that the drilling fluid has an activity less than or equal to the amount needed to obtain a shale retention value of greater than 90%, when tested on a shale formation sample. The fluid does not contain an organophilic clay or organophilic lignite. In a separate embodiment the fluid comprises a suspending agent, wherein the suspending agent is a polymer comprising urea linkages.