CROSSLINKED FLUID TREATMENT AND METHODS FOR FRACTURING UNDERGROUND FORMATIONS BASED ON FLOWBACK, PRODUCTION WATER, SEAWATER, FRESH WATER, AND MIXTURES OF SAME
申请人:Sotro Financial, Inc.
公开号:EP3178900A1
公开(公告)日:2017-06-14
The present invention provides cross-linked fracture fluids that allow for reusing return water with no treatment, minimizing the environmental impact thereof and reducing the use of fresh water to very low levels to stimulate wells or re-stimulate wells stimulated in the past. Preparation and use methods of said fluids in fractured subterranean formations drilled by wells, based on return water, production water, sea water, fresh water and mixtures thereof, are provided. Fluids are basically composed of: return water, production water, sea water, fresh water and mixtures thereof present in a sufficient amount to moisten the gelling agent and to form a gellified aqueous agent; a gelling agent; an iron control agent; an alkaline buffer; a delayed cross-linking agent, and a rupture system to "break" the fluid and improve fracture cleaning.
本发明提供的交联压裂液无需处理即可重复使用回水,最大限度地减少了对环境的影响,并将淡水用量降至极低水平,以刺激油井或重新刺激过去刺激过的油井。提供了以回流水、生产水、海水、淡水及其混合物为基础的上述流体的制备和使用方法。流体的基本组成包括:回水、生产水、海水、淡水及其混合物,其含量足以润湿胶凝剂并形成胶凝水剂;胶凝剂;铁控制剂;碱性缓冲剂;延迟交联剂;以及用于 "破碎 "流体并改善裂缝清洁的破裂系统。