| 摘要 |
The present invention provides crosslinked fracturing fluids that allow flowback to be reused untreated, thereby minimising the environmental effect of same and reducing to very low levels the use of fresh water to stimulate new wellbores or re-stimulate previously stimulated wellbores. Methods for preparing and using said fluids in underground fracturing formations penetrated by wellbores, based on flowback, production water, seawater, freshwater, and mixtures of same, are provided. The fluids are basically composed of: flowback, production water, seawater, fresh water or mixtures of same in a sufficient quantity to hydrate a gelling agent and to form a gelled aqueous fluid; the gelling agent; an iron control agent; an alkaline buffer; a delayed crosslinker; and a breaker system for "breaking" the fluid and improving the cleaning of the fracture. |
