Permeability-Modifying Drilling Fluids and Methods of Use
OwnerLarry S. Eoff, Eldon D. Dalrymple +1inventors
InventorsLarry S. Eoff, Eldon D. Dalrymple, B. Raghava Reddy
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Abstract
Drilling fluids comprising a base fluid and a hydrophobically modified polymer. The hydrophobically modified polymer consisting of alkyl chains having a carbon chain length between about 4 and about 22 carbons bound to a hydrophilic polymer. The hydrophilic polymer (1) consists of a polymer backbone that contains polar heteroatoms, at least one of which is not a nitrogen atom, and at least a portion of the polar heteroatoms are functionalized with the alkyl chains; and, (2) comprises at least one hydrophilic polymer selected from the group consisting of a cellulose, a chitosan, a polyetheramine, a polyhydroxyetheramine, a polylysine, and a polysulfone.
Claims13
-68. (canceled)
A drilling fluid for use in a well bore in a subterranean formation comprising:
- a base fluid and a hydrophobically modified polymer,
- the hydrophobically modified polymer consisting of alkyl chains having a carbon chain length between about 4 and about 22 carbons bound to a hydrophilic polymer, wherein the hydrophilic polymer:
- consists of a polymer backbone that contains polar heteroatoms, at least one of which is not a nitrogen atom, and at least a portion of the polar heteroatoms are functionalized with the alkyl chains;
- and,
- comprises at least one hydrophilic polymer selected from the group consisting of a cellulose, a chitosan, a polyetheramine, a polyhydroxyetheramine, a polylysine, and a polysulfone.
A drilling fluid for use in a well bore in a subterranean formation comprising:
- a base fluid and a hydrophobically modified polymer,
- the hydrophobic compound consisting of an alkyl halide having a carbon chain length between about 4 and about 22 carbons, and
- the hydrophilic polymer:
- consists of a polymer backbone that contains polar heteroatoms, at least one of which is not a nitrogen atom, and at least a portion of the polar heteroatoms are functionalized with the alkyl chains;
- and,
- comprises at least one hydrophilic polymer selected from the group consisting of a cellulose, a chitosan, a polyetheramine, a polyhydroxyetheramine, a polylysine, and a polysulfone.
Dependencies are inferred from the claim text.