Use of sized salts as bridging agent for oil based fluids

Details Use of sized salts as bridging agent for oil based fluids Use of sized salts as bridging agent for oil based fluids

1995-03-31

1997-02-11

Springer, David B.

Earth boring, well treating, and oil field chemistry

Well treating

166292, 166305, 166312, 166282, 507108, 507140, 507276, 507269, E21B 4300, E21B 33138, E21B 43267

Patent

active

056020830

ABSTRACT:
An oil-based fluid system has been discovered using a distribution of salt particle sizes, an oil or water/oil emulsion, a suspending agent for suspending the salt particles in the oil and a filtration control agent. It is important that the salt 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, 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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patent: 4186803 (1980-02-01), Mondshine
patent: 4822500 (1989-04-01), Dobson, Jr. et al.
patent: 5228524 (1993-07-01), Johnson et al.
patent: 5325921 (1994-07-01), Johnson et al.

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