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US 2003/0119678 A1Published application
Biodegradable chelant compositions for fracturing fluid
AssigneeBaker Hughes Incorporated
InventorJames B. Crews
Life of this patent
Estimating the term…
Abstract
It has been discovered that biodegradable and non-toxic chelant compositions can perform multiple beneficial functions in an aqueous fracturing fluid through the chelation of ions. Some of the multiple functions include various combinations of the following: demulsifier, demulsifier enhancer, scale inhibitor, crosslink delay agent, crosslinked gel stabilizer, enzyme breaker stabilizer, and the like. Some of the chelants used in the compositions include, but are not necessarily limited to, sodium polyaspartate; sodium iminodisuccinate; disodium hydroxyethyleneiminodiacetate (Na2HEIDA); sodium gluconate; sodium glucoheptonate; sugar alcohols; monosaccharides; disaccharides; and mixtures thereof.
Claims27
A biodegradable additive composition comprising:
- a) water;
- and
- b) at least two of the chelants selected from the group consisting of:
- sodium polyaspartate;
- sodium iminodisuccinate;
- disodium hydroxyethyleneiminodiacetate (Na2HEIDA);
- sodium gluconate;
- sodium glucoheptonate;
- sugar alcohols;
- monosaccharides;
- and
- disaccharides.
9 more elements
A biodegradable additive composition comprising:
- a) water;
- and
- b) at least chelant selected from the group consisting of sodium iminodisuccinate, disodium hydroxyethyleneiminodiacetate (Na2HEIDA), and mixtures thereof;
- c) at least one additional chelant selected from the group consisting of:
- sodium polyaspartate;
- sodium gluconate;
- sodium glucoheptonate;
- sugar alcohols;
- monosaccharides;
- disaccharides;
- and
- d) a solvent or surfactant selected from the group consisting of polyvinylpyrrolidone (PVP), alkyl glycols, alkyl glycol ethers, alkyl pyrrolidones, alkyl succinates, alkyl glutamades, alkyl sarcosinates, alkyl carbonates, monoethanol amide, alkyl sorbitans, and alkyl glucosides.
9 more elements
A method of fracturing a subterranean formation comprising:
- providing a biodegradable fracturing fluid composition having:
- a) a crosslinker selected from the group consisting of titanate, zirconate, and borate crosslinkers, compounds that can generate these crosslinkers and mixtures thereof;
- b) at least two of the chelants selected from the group consisting of:
- sodium polyaspartate;
- sodium iminodisuccinate;
- disodium hydroxyethyleneiminodiacetate (Na2HEIDA);
- sodium gluconate;
- sodium glucoheptonate;
- sugar alcohols;
- monosaccharides;
- and
- disaccharides;
- where the amount of the compounds of b) is effective to demulsify the fracturing fluid;
- and
- c) water;
- and
- pumping the fracturing fluid down hole at a pressure effective to fracture a subterranean formation.
14 more elements
A method of fracturing a subterranean formation comprising:
- providing a biodegradable fracturing fluid composition having:
- a) a crosslinker selected from the group consisting of titanate, zirconate, and borate crosslinkers, compounds that can generate these crosslinkers and mixtures thereof;
- b) at least two of the chelants selected from the group consisting of:
- sodium polyaspartate;
- sodium iminodisuccinate;
- disodium hydroxyethyleneiminodiacetate (Na2HEIDA);
- sodium gluconate;
- sodium glucoheptonate;
- sugar alcohols;
- monosaccharides;
- and
- disaccharides;
- where the amount of the compounds of b) is effective to delay crosslinking of the crosslinkers;
- and
- c) water;
- and
- pumping the fracturing fluid down hole at a pressure effective to fracture a subterranean formation.
14 more elements
A method of fracturing a subterranean formation comprising:
- providing a biodegradable fracturing fluid composition having:
- a) a crosslinker selected from the group consisting of titanate, zirconate, and borate crosslinkers, compounds that can generate these crosslinkers and mixtures thereof;
- b) at least two of the chelants selected from the group consisting of:
- sodium polyaspartate;
- sodium iminodisuccinate;
- disodium hydroxyethyleneiminodiacetate (Na2HEIDA);
- sodium gluconate;
- sodium glucoheptonate;
- sugar alcohols;
- monosaccharides;
- and
- disaccharides;
- where the amount of the compounds of b) is effective to improve carbonate or sulfate scale inhibition, as compared with identical fracturing fluids without the compounds of b);
- and
- c) water;
- and
- pumping the fracturing fluid down hole at a pressure effective to fracture a subterranean formation.
14 more elements
A method of fracturing a subterranean formation comprising:
- providing a biodegradable fracturing fluid composition having:
- a) a crosslinker selected from the group consisting of titanate, zirconate, and borate crosslinkers, compounds that can generate these crosslinkers and mixtures thereof;
- b) at least two of the chelants selected from the group consisting of:
- sodium polyaspartate;
- sodium iminodisuccinate;
- disodium hydroxyethyleneiminodiacetate (Na2HEIDA);
- sodium gluconate;
- sodium glucoheptonate;
- sugar alcohol;
- monosaccharides;
- and
- disaccharides;
- where the amount of the compounds of b) is effective to improve crosslink gel stabilization of b) as compared with identical fracturing fluids without the compounds of b);
- and
- c) water;
- and
- pumping the fracturing fluid down hole at a pressure effective to fracture a subterranean formation.
14 more elements
A method of fracturing a subterranean formation comprising:
- providing a biodegradable fracturing fluid composition having:
- a) a crosslinker selected from the group consisting of titanate, zirconate, and borate crosslinkers, compounds that can generate these crosslinkers and mixtures thereof;
- b) at least two of the chelants selected from the group consisting of:
- sodium polyaspartate;
- sodium iminodisuccinate;
- disodium hydroxyethyleneiminodiacetate (Na2HEIDA);
- sodium gluconate;
- sodium glucoheptonate;
- disaccharides;
- where the amount of the compounds of b) is effective to improve enzyme breaker stabilization of b) as compared with identical fracturing fluids without the compounds of b);
- and
- c) water;
- and
- pumping the fracturing fluid down hole at a pressure effective to fracture a subterranean formation.
11 more elements
A fracturing fluid comprising:
- a) water;
- b) at least two of the chelants selected from the group consisting of:
- sodium polyaspartate;
- sodium iminodisuccinate;
- disodium hydroxyethyleneiminodiacetate (Na2HEIDA);
- sodium gluconate;
- sodium glucoheptonate;
- sugar alcohols;
- monosaccharides;
- and
- disaccharides;
- c) a polymer;
- and
- d) a polymer crosslinker selected from the group consisting of titanate, zirconate, and borate crosslinkers, compounds that can generate these crosslinkers and mixtures thereof.
11 more elements
Dependencies are inferred from the claim text.