Control of the fluid loss of well drilling and servicing fluids

Details Control of the fluid loss of well drilling and servicing fluids Control of the fluid loss of well drilling and servicing fluids

1995-08-08

1997-06-24

Gibson, Sharon

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

507113, 507114, C09K 702

Patent

active

056417284

ABSTRACT:
The invention provides brine based well drilling and servicing fluids containing a fluid loss control additive selected from the group consisting of (1) a crosslinked ether derivative of a partially depolymerized starch, (2) a partially depolymerized crosslinked ether derivative of starch, or (3) mixtures thereof. The fluid loss control additive provides decreased fluid losses at much lower viscosities than the corresponding starch derivatives which have not been partially depolymerized. This enables their use in fluids at concentrations sufficient to provide excellent filtration control, the fluids having a viscosity sufficient for circulation of the fluids in the borehole. The invention also provides a method of reducing the fluid loss of well drilling and servicing fluids utilizing the fluid loss control additives (1) and/or (2).

REFERENCES:
patent: 2929811 (1960-03-01), Hofreiter et al.
patent: 4411814 (1983-10-01), Burkhardt
patent: 5238065 (1993-08-01), Mondshine
patent: 5504061 (1996-04-01), Plark
patent: 5514644 (1996-05-01), Dobson

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