E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/22 (2006.01) C09K 8/08 (2006.01) C09K 8/16 (2006.01) C09K 8/50 (2006.01) C09K 8/60 (2006.01) E21B 21/00 (2006.01) E21B 43/04 (2006.01) C09K 7/02 (1995.01)
Patent
CA 2153183
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.
Baker Hughes Incorporated
Gowling Lafleur Henderson Llp
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