Methods of Treating Wellbores with Recyclable Fluids
First Claim
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1. A method of performing wellbore cleanout operation comprising:
- a. preparing and injecting into a wellbore an aqueous fluid comprising a sphingan heteropolysaccharide;
b. entraining wellbore fill material in the aqueous fluid;
c. recovering at the surface at least a portion of the fluid and the entrained wellbore fill material for substantial separation of the wellbore fill material from the fluid; and
d. injecting the portion of the fluid into the wellbore for a second cycle;
wherein no significant replenishment of the sphingan heteropolysaccharide is required.
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Abstract
Methods for treating wellbores using fluids containing a sphingan heteropolysaccharide which contributes viscosity stability and a decrease in friction pressure. Some methods are clean-out operations using recyclable-viscosity fluids containing at least a sphingan heteropolysaccharide and an optional salt. Others include methods of pumping fluids incorporating sphingan heteropolysaccharides to reduce pumping frictional pressure.
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Citations
29 Claims
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1. A method of performing wellbore cleanout operation comprising:
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a. preparing and injecting into a wellbore an aqueous fluid comprising a sphingan heteropolysaccharide; b. entraining wellbore fill material in the aqueous fluid; c. recovering at the surface at least a portion of the fluid and the entrained wellbore fill material for substantial separation of the wellbore fill material from the fluid; and d. injecting the portion of the fluid into the wellbore for a second cycle; wherein no significant replenishment of the sphingan heteropolysaccharide is required. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of treating a wellbore comprising:
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a. preparing and injecting into a wellbore, an aqueous fluid comprising a sphingan heteropolysaccharide; b. recovering at the surface at least a portion of the fluid; and c. injecting the portion of the fluid into the wellbore for a second cycle; wherein no significant replenishment of the heteropolysaccharide is required. - View Dependent Claims (23, 24, 25)
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- 26. A method of reducing frictional pressure of a fluid composition pumped through a tube by incorporation of a sphingan heteropolysaccharide as a component of the fluid composition.
Specification