Abstract: Compositions comprising an acrylamide polymer emulsion and a nonionic surfactant suitable for use as friction reducers for hydraulic fracturing are disclosed. The nonionic surfactants include aralkylated phenol ethoxylates, amine ethoxylates, amidoamine ethoxylates, linear or branched alcohol EO/PO alkoxylates, ethoxylated alcohols, alkylphenol ethoxylates, and EO-capped poly(oxypropylene) block copolymers. Improved hydraulic fracturing processes in which an acrylamide polymer emulsion is used as a friction reducer are also described. In these processes, the surfactant is included in the composition with the acrylamide polymer friction reducer, or it is introduced separately into the process. The performance of low-cost polyacrylamide friction reducers can be boosted with a small proportion of certain readily available nonionic surfactants.

Abstract: Compositions comprising an acrylamide polymer emulsion and a nonionic surfactant suitable for use as friction reducers for hydraulic fracturing are disclosed. The nonionic surfactants include aralkylated phenol ethoxylates, amine ethoxylates, amidoamine ethoxylates, linear or branched alcohol EO/PO alkoxylates, ethoxylated alcohols, alkylphenol ethoxylates, and EO-capped poly(oxypropylene) block copolymers. Improved hydraulic fracturing processes in which an acrylamide polymer emulsion is used as a friction reducer are also described. In these processes, the surfactant is included in the composition with the acrylamide polymer friction reducer, or it is introduced separately into the process. The performance of low-cost polyacrylamide friction reducers can be boosted with a small proportion of certain readily available nonionic surfactants.

Abstract: A breaker system for a fracturing fluid having a polymer, includes an oxidative polymer breaker which includes water, a persulfate and a transition metal chelate having more than one accessible oxidation state, which inhibits or delays the break of the polymer by the breaker.

Abstract: A breaker system for a fracturing fluid having a polymer, includes an oxidative polymer breaker which includes water, a persulfate and a transition metal chelate having more than one accessible oxidation state, which inhibits or delays the break of the polymer by the breaker.

Abstract: A composition for acid stimulation of a subterranean formation, which is an acidizing fluid including a sulfobetaine surfactant, a polymeric associative thickener, and a short chain alcohol. The acidizing fluid comprises sufficient acid so as to be non-viscous when pumped into a wellbore and becomes viscous as acid is consumed by reaction with formation components and pH of the fluid rises.