Methods of fracturing a subterranean formation include introducing a fracturing fluid containing an aqueous medium, a viscosifying agent and a polyethylene oxide alkyl ether through a wellbore and into the subterranean formation, pressurizing the fracturing fluid to fracture the subterranean formation, and allowing the fracturing fluid to flow back into the wellbore from the subterranean formation. The polyethylene oxide alkyl ether useful in some embodiments is defined according to the formula: where R.sub.1 and R.sub.2 are independently selected from linear or branched alkyl groups having from 2 to 16 carbon atoms, and ‘n’ may be a value selected from within a range of from 1 to 100.

The present application provides expandable chemical diverting agents, such as flexible polyurethanes and swellable hydrogels, or chemical precursors thereof. Methods of using these expandable diverting agents for treating a subterranean formation are also provided. An example of subterranean formation treatment process described in the present application is wellbore stimulation, such as hydraulic fracturing or matrix acid treatment.

A method of polymer flooding within a carbonate formation the method comprising: injecting a treatment fluid composition into a wellbore, the treatment fluid composition comprising: a base fluid, and a viscosifier comprising a branched block copolymer wherein the branched block copolymer is a crosslinked, polymerized reaction product of crosslinker C and monomer A and monomer B and monomer D; and increasing hydrocarbon production from the wellbore.

Core-shell particles for treatment of subterranean formations are provided. A method may include placing in the subterranean formation a composition including a core-shell particle including a hydrophilic core and a hydrophobic shell.

A method of hydraulic fracturing may comprise mixing at least one liquid sand mixture with a fluid to produce a fracturing fluid; and conveying the fracturing fluid to two or more wellbores simultaneously, wherein the wellbores penetrate a subterranean formation.

A method of hydraulic fracturing may comprise mixing at least one liquid sand mixture with a fluid to produce a fracturing fluid; and conveying the fracturing fluid to two or more wellbores simultaneously, wherein the wellbores penetrate a subterranean formation.

The invention is directed to delayed gelation agents comprising a degradable polymeric cage containing therein one or more gelation agents. The cage degrades in situ, e.g, in an oil reservoir, thus releasing the gelation agent(s), which can then crosslink second polymers in situ to form a gel.

Well treatment fluids, and methods for treating wellbores or fracturing subterranean formations, which include acrylamide polymer or copolymer crosslinked with one or more crosslinkers and one or more iron-containing compounds are provided. The fluids and methods may be used to carry proppants into fractures and to increase fluid recovery in hydraulic fracturing applications

Polymers and fracturing fluid compositions including a base fluid, an effective amount of a hydratable polymer composition including one or more gel-forming hydratable polymers, a friction reducer composition including hydrolyzed or partially hydrolyzed hydrolyzable polymers and copolymers, a cross-linking composition in an amount sufficient to crosslink the one or more gel-forming hydratable polymers to form crosslinked structures within the fracturing fluid composition with or without a proppant and methods including combining an aqueous fluid and an oleaginous fluid to prepare an invert emulsion comprising a polymerizable composition, degassing the invert emulsion under an extensional flow regime through an elongated passageway of an extender and thereby removing oxygen to produce a degassed invert emulsion and compositions and methods including a hydratable additive concentrate comprising a hydratable additive that is at least substantially hydrated and a hydrating liquid, wherein the hydratable additive concentrate is a mixture produced according to a method that includes flowing a hydrating liquid in a extensional flow regime through an elongated passageway of an extender.

An aqueous caustic composition comprising: a caustic component; an amino acid additive adapted to provide an extended buffering effect to the caustic composition when such is exposed to an acid; and water, wherein the caustic component and the amino acid additive are present in a molar ratio ranging from 15:1 to 5:1. Methods of using such compositions are also disclosed.