Fracturing fluid for secondary gas production

Abstract

The invention pertains to a process for fracturing a subterranean formation using a mixture of methane (natural gas) and propane/butane (liquefied petroleum gas). The process comprises: a)providing a first fluid (in a gas or liquefied form) comprising at least 50 wt. % of methane: b)providing a second fluid (in a gas or liquefied form) comprising at least 50 wt. % of the combination of propane and butane: c)mixing and, in case of a gas mixture, liquefying said first fluid and said second fluid to obtain a liquefied fluid mixture comprising 15-80 wt. % of methane and 15-80 wt. % of the combination of propane and butane, said liquefied mixture having a temperature and a pressure such that the liquefied fluid stays above the bubble point of the mixture; d)blending a proppant and/or a gellant into the liquefied fluid mixture to produce a 1 fracturing fluid; e)injecting the fracturing fluid into the subterranean formation.

Dependencies are inferred from the claim text.