Disclosed are compositions and methods for the pressure protection of existing wells during infill drilling operations.

A composition includes a nonionic fluorinated polymeric surfactant, a nonfluorinated surfactant, and a scale treatment. Additionally, a method for scale treatment is provided. The method includes injecting gas into the aforementioned composition to produce a foam and injecting the foam into a formation. In the formation, the foam may be exposed to a first temperature at which it has a first viscosity. The foam may be maintained inside the formation for a period of time, and then recovered from the formation, at which point it is exposed to a second temperature and has a second viscosity.

An effective amount of at least one anionic surfactant may be present within a high salinity foamed fluid composition in an effective amount to generate an IFT as low as 10.sup.−3 mN/m. The anionic surfactant may be a sulfonate surfactant and/or a sulfate surfactant. The foamed fluid composition may be used to perform an operation, including but not limited to, a gas lift operation, a drilling operation, a completion operation, a stimulation operation, a fracturing operation, an injection operation, an enhanced oil recovery operation, and combinations thereof.

An effective amount of at least one anionic surfactant may be present within a high salinity foamed fluid composition in an effective amount to generate an IFT as low as 10.sup.−3 mN/m. The anionic surfactant may be a sulfonate surfactant and/or a sulfate surfactant. The foamed fluid composition may be used to perform an operation, including but not limited to, a gas lift operation, a drilling operation, a completion operation, a stimulation operation, a fracturing operation, an injection operation, an enhanced oil recovery operation, and combinations thereof.

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.

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.

The present disclosure relates to a method and a system for extracting fluids comprising natural gas and water from a reservoir via at least one oil well/gas well connected to at least one flow line network. For extracting fluids, a composition containing a foaming composition is injected at a pre-determined location into the oil well/gas well and/or the flow line network. The foaming composition is then agitated with the water and converted to foam. The agitation is carried out by the natural gas. The foam formed reduces the interfacial surface tension between the natural gas and the water, and thereby facilitates reduction in liquid holdup in the oil well/gas well and/or the flow line network. The system of the present disclosure includes at least one manifold, at least one distribution assembly and a plurality of control valves and sensors.

A method of treating a subsurface formation comprises mixing an unfractionated hydrocarbon mixture, water, and natural gas with a foaming agent to form a stimulation fluid comprising foam. The unfractionated hydrocarbon mixture comprises ethane, propane, butane, isobutane, and pentane plus. The method further includes increasing a pressure of the stimulation fluid and injecting the stimulation fluid into the subsurface formation.

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.

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.