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

C - Chemistry, Metallurgy

09

K

C09K 8/08 (2006.01) C09K 8/035 (2006.01) C09K 8/04 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2178766

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).

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