Biodegradable retarder for cementing applications
AssigneeHalliburton Energy Services, Inc.
InventorsAshok K. Santra, B. Raghava Reddy, D. Chad Brenneis
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Abstract
Cement compositions comprising carboxylated inulin and methods of using the same to cement a workspace. In one embodiment, a method of cementing includes providing a cement composition comprising a carboxylated inulin, for example, in a subterranean formation. The method further includes allowing the cement composition to set. In some embodiments, the cement composition has a thickening time of from about 2 hours to about 11 hours. In other embodiments, the cement composition has a viscosity that is about constant for a period of time after the cement composition is placed.
Claims41
A method of cementing comprising:
- providing a cement comprising a carboxylated inulin, water, cement and a dispersant, wherein the carboxylated inulin is derived from an inulin having an average molecular weight of about 500 or higher;
- and
- allowing the cement composition to set.
A method of cementing in a subterranean formation comprising:
- circulating a drilling fluid in a wellbore;
- providing a cement composition comprising a carboxylated inulin, wherein the carboxylated inulin is derived from an inulin having an average molecular weight of about 500 or higher;
- placing the cement composition in the subterranean formation, wherein the cement composition displaces at least a portion of the drilling fluid from the wellbore;
- and
- allowing the cement composition to set therein.
A method of cementing comprising:
- introducing a cement composition comprising a carboxylated inulin to a set cement formation having permeable zones, wherein the carboxylated inulin is derived from an inulin having an average molecular weight of about 500 or higher, and wherein the cement composition is forced under pressure into the permeable zones;
- and
- allowing the cement composition to set therein.
A method comprising:
- providing a cement composition consisting of a carboxymethylated inulin, a hydraulic cement, a silica material, and water, wherein the carboxylated inulin is derived from an inulin having an average molecular weight of about 500 or higher;
- placing the cement composition into a workspace, wherein the temperature of a portion of the workspace is between 300-400° F.;
- and
- allowing the composition to set, wherein the cement composition is substantially free of suspension aids.
A method of cementing comprising:
- providing a cement composition comprising at least two retardants;
- placing the cement composition into a workspace, wherein the temperature of a portion of the workspace is between 300-400° F.,
- allowing the cement composition to set, wherein the cement composition is substantially free of water-reducing agents, wherein one of the at least two retardants comprises carboxylated inulin and another one of the at least two retardants is selected from the group consisting of borate salts, polymers comprising carboxylate groups, tartaric acid, gluconic acid and combinations thereof;
- and wherein the carboxylated inulin is derived from an inulin having an average molecular weight of about 500 or higher.
Dependencies are inferred from the claim text.