Fluid system for controlling fluid losses during hydrocarbon rec

Details Fluid system for controlling fluid losses during hydrocarbon rec Fluid system for controlling fluid losses during hydrocarbon rec

1994-07-05

1996-04-02

Hollinden, Gary E.

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

507213, 507269, 507111, 507110, 507140, 507906, E21B 4324, C09K 702

Patent

active

055040624

ABSTRACT:
A fluid system has been discovered using a distribution of graded calcium carbonate particle sizes, a biopolymer and a polymerized starch. The biopolymer is a non-ionic polysaccharide of the scleroglucan type. It is important that the calcium carbonate particles be distributed across a wide size range to effectively prevent filtration or fluid loss into the formation. Since the filter cake particles do not invade the well bore due to the action of the biopolymer and starch, no high pressure spike occurs during the removal of the filter cake. This high pressure spike indicates damage to the formation and well bore surface, which damage typically reduces overall permeability of the formation. The rheological properties of the fluid allow it to be used in a number of applications where protection of the original permeable formation is desirable. The applications include, but are not limited to, drilling fracturing and controlling fluid losses during completion operations, such as gravel packing or well bore workovers.

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