Use of methylhydroxyethyl cellulose as cement additive
AssigneeBaker Hughes Incorporated
InventorsWindal Scott Bray, Andreas Brandl
Life of this patent
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Abstract
Methylhydroxyethyl cellulose may be used as an additive in cement slurries in the treatment of wells to prevent or reduce the occurrence of gas channeling. In addition to acting as a gas control additive, methylhydroxyethyl cellulose controls fluid loss, minimizes free fluid and stabilizes foam during cementing of the well.
Claims20
A method of cementing a pipe or casing in a wellbore which comprises:
- (a) introducing into the wellbore a cementitious slurry comprising methylhydroxyethyl cellulose (MHEC), wherein the MHEC is present in the cementitious slurry in an amount sufficient to reduce or prevent the occurrence of gas channeling in the wellbore during the cementing of the pipe or casing;
- and
- (b) allowing the slurry to harden to a solid mass.
A method of cementing a pipe or casing in a wellbore which comprises introducing into the wellbore a cementitious slurry comprising methylhydroxyethyl cellulose (MHEC), wherein the MHEC is present in the cementitious slurry in an amount sufficient for at least one of the following:
- (a) reducing or preventing the occurrence of gas channeling in the wellbore during cementing;
- (b) controlling fluid loss during cementing;
- (c) minimizing free fluid during cementing;
- or
- (d) improving slurry stability during cementing.
A method of cementing within a gas or oil well and controlling fluid loss during cementing, the method comprising:
- pumping into the well a cementitious slurry comprising water, cement and MHEC;
- and
- allowing the slurry to harden to a solid mass.
A method for reducing the occurrence of gas channeling during the cementing of a well which comprises introducing into the well a cementitious slurry comprising Portland cement and methylethylhydroxy cellulose (MHEC).
Dependencies are inferred from the claim text.