Low damage treatment fluids and methods of using the same
AssigneeSchlumberger Technology Corporation
InventorsAndrey Mirakyan, Andrew Schmidt, Jesse Lee, Jian Zhou
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Abstract
The invention relates to novel wellbore treatment methods and fluids using compositions formed from an aqueous medium, a regularly substituted hydrophilically functional polysaccharide having a degree of substitution from about 0.1 to about 0.5, wherein the percent of insoluble polysaccharide is about 10% or less, and a crosslinker. The wellbore treatment fluid is particularly useful for fracturing a subterranean formation penetrated by a wellbore.
Claims24
A method for treating a subterranean formation penetrated by a wellbore, the method comprising:
- a) preparing a treatment fluid comprising:
- i. an aqueous medium,
- ii. a regularly substituted hydrophilically functional polysaccharide having a degree of substitution from about 0.1 to about 0.5, wherein the percent of insoluble polysaccharide residue after breaking is about 10% or less, and
- iii. a crosslinking agent;
- b) injecting the treatment fluid into the wellbore at a pressure sufficient to treat the formation;
- and
- c) providing a breaking system that causes a reduction in viscosity of the fluid after its injection but does not significantly impact fluid viscosity at surface and during the injection;
- whereby the retained conductivity after breaking is 50% or greater.
A method of fracturing a subterranean formation penetrated by a wellbore, the method comprising:
- a) preparing a fracturing fluid comprising:
- i. an aqueous medium,
- ii. a regularly substituted hydrophilically functional polysaccharide having a degree of substitution from about 0.1 to about 0.5, wherein the percent of insoluble polysaccharide residue after breaking is about 10% or less, and
- iii. a crosslinking agent;
- b) introducing the fracturing fluid into the wellbore at a pressure sufficient to fracture the formation;
- c) providing a breaking system that causes a reduction in viscosity of the fluid after its injection but does not significantly impact fluid viscosity at surface and during the injection;
- and
- whereby the retained conductivity after fracturing is greater than 50%.
A wellbore treatment fluid comprising an aqueous medium, a regularly substituted hydrophilically functional polysaccharide having a degree of substitution from about 0.1 to about 0.5, wherein the percent of insoluble polysaccharide residue after breaking is about 10% or less, and a crosslinking agent.
Dependencies are inferred from the claim text.