Cement spacer system for wellbores, methods of making, and methods of use
AssigneeBaker Hughes, A Ge Company, LLC
InventorScott Gregory Nelson
Life of this patent
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Abstract
A cement spacer fluid for use in a wellbore includes an aqueous cement spacer carrier fluid and a preformed synthetic polymer swellable in the aqueous cement spacer carrier fluid in an amount effective to displace a drilling fluid during a cementing operation. Preferably, the polymer is particulate, and forms a hydrated pack of particles. A method of cementing a wellbore comprising a drilling fluid includes injecting the cement spacer fluid into the wellbore to displace the drilling fluid; injecting a cement slurry into the wellbore subsequent to injecting the cement spacer fluid; and hardening the cement in the slurry to cement the wellbore.
Claims16
A method of cementing a wellbore comprising a drilling fluid, the method comprising
- injecting a cement spacer fluid into the wellbore to displace the drilling fluid;
- injecting a cement slurry into the wellbore subsequent to injecting the cement spacer fluid;
- and
- hardening the cement in the slurry to cement the wellbore,
- wherein the cement spacer fluid comprises:
- an aqueous cement spacer carrier fluid;
- and
- a preformed synthetic polymer swellable in the aqueous cement spacer carrier fluid in an amount effective to displace a drilling fluid during a cementing operation,
- wherein the preformed synthetic polymer comprises
- a copolymer of (meth)acrylamide with maleic anhydride, vinyl acetate, ethylene oxide, ethylene glycol, acrylonitrile, or a combination comprising at least one of the foregoing;
- poly(acrylamide) having crosslinks derived from polyethylene glycol diacrylate;
- poly(acrylic acid) having crosslinks derived from a vinyl ester oligomer;
- a poly(acrylic acid) partial sodium salt-graft-poly(ethylene glycol);
- or
- a copolymer of acrylic acid and a salt thereof having crosslinks derived from polyethylene glycol diacrylate;
- and
- the preformed synthetic polymer is present in the cement spacer fluid in a concentration of about 10 pounds to about 200 pounds per thousand gallons of aqueous cement spacer carrier fluid.
Dependencies are inferred from the claim text.