Microemulsion to improve shale gas production by controlling water imbibition

摘要

The invention provides a method for treating a subterranean formation comprising at least in part tight gas sand and shale rocks, the method comprising: forming a solvent- surfactant blend by combining a solvent, a surfactant and a co-surfactant; adding a diluent to the solvent-surfactant blend to form a microemulsion; wherein the wettability of the formation altered from water-wet to gas-wet, and the amount of water imbibed into the formation is reduced.