Y-grade NGL or L-grade is used as a carrier fluid to transport one or more chemical additives into a hydrocarbon bearing reservoir to treat the hydrocarbon bearing reservoir. The Y-grade NGL or L-grade and the chemical additives may be chilled and/or foamed.

A gel composition for use in treating subterranean formations is provided. The gel composition is a non-aqueous based oil gel system that can include a hydrocarbon liquid capable of gelation, a phosphate ester, and a cross-linking agent. The gel composition can include the oil gel which results from adding a phosphate ester, a crosslinking agent and a delay additive to the hydrocarbon liquid.

A hydrocarbon-based or ester-based drilling fluid or mud is described wherein the drilling fluid contains cesium phosphate. The hydrocarbon-based or ester-based drilling fluid or mud can have, for example, an external phase that contains hydrocarbon fluid and an internal phase that contains cesium phosphate. The hydrocarbon-based drilling fluid or mud can further contain at least one emulsifier or surfactant, and optionally other ingredients. The present invention can permit hydrocarbon-based drilling fluids to be essentially solids-free and may be used without corrosion and/or formation damage problems, for example, due to the use of the cesium phosphate in an internal phase of the hydrocarbon-based or ester-based drilling fluid. The present invention also relates to hydrocarbon-based or ester-based fluids for completion, workover, suspension and packer operations which contain cesium phosphate.

A hydrocarbon-based or ester-based drilling fluid or mud is described wherein the drilling fluid contains cesium phosphate. The hydrocarbon-based or ester-based drilling fluid or mud can have, for example, an external phase that contains hydrocarbon fluid and an internal phase that contains cesium phosphate. The hydrocarbon-based drilling fluid or mud can further contain at least one emulsifier or surfactant, and optionally other ingredients. The present invention can permit hydrocarbon-based drilling fluids to be essentially solids-free and may be used without corrosion and/or formation damage problems, for example, due to the use of the cesium phosphate in an internal phase of the hydrocarbon-based or ester-based drilling fluid. The present invention also relates to hydrocarbon-based or ester-based fluids for completion, workover, suspension and packer operations which contain cesium phosphate.

Various embodiments disclosed relate to compositions including functionalized polysaccharide for treatment of subterranean formations and methods and systems including the same. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition including a functionalized polysaccharide that includes a hydroxy(C.sub.1-C.sub.5)alkyl functionalization and a polyhydroxy(C.sub.2-C.sub.5)alkyl functionalization.

Various embodiments disclosed relate to compositions including functionalized polysaccharide for treatment of subterranean formations and methods and systems including the same. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition including a functionalized polysaccharide that includes a hydroxy(C.sub.1-C.sub.5)alkyl functionalization and a polyhydroxy(C.sub.2-C.sub.5)alkyl functionalization.

Use of supercritical Y-grade natural gas liquids for a variety of processes and across numerous industrial applications is described herein. The low viscosity, high density, and tunable solvent properties of supercritical Y-grade natural gas liquids are useful for example in enhanced reservoir recovery and treatment, control of chemical reactions and processes, and/or single or two-phase separations.

Use of supercritical Y-grade natural gas liquids for a variety of processes and across numerous industrial applications is described herein. The low viscosity, high density, and tunable solvent properties of supercritical Y-grade natural gas liquids are useful for example in enhanced reservoir recovery and treatment, control of chemical reactions and processes, and/or single or two-phase separations.

A method of treating a subterranean formation from a well, the method which comprises preparing a proppant slurry which comprises (a) proppant particles and (b) a first carrier fluid; preparing a proppant free injection liquid which comprises a second carrier fluid wherein the first and second carrier fluids are immiscible and wherein no proppant is intentionally added to the proppant free injection liquid; and injecting the proppant slurry and the proppant free injection liquid into the formation, is provided.

Various embodiments disclosed relate to crosslinkers for treatment of a subterranean formation and methods of using the same. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition that includes polysaccharide viscosifier. The composition also includes a crosslinker including a silica bonded to at least one crosslinking group that includes at least one amine group including at least one of a boronic acid and an ester thereof.