SYSTEMS AND METHODS FOR MULTI-STAGE FRACTURE

The invention discloses a downhole system for multi-stage fracturing. The downhole system for multi-stage fracturing has a first valve bank and a second valve bank from the first valve bank to downhole. Each of the first and second valve banks has a fracturing valve. At least one of the first valve group and the second valve group has an elastic valve. A single plug device is used to open all the valves in the second valve bank, but to keep all the valves in the first valve bank closed. 本发明公开了一种用于多级压裂的井下系统，其具有第一阀组和从第一阀组向井下的第二阀组。第一阀组和第二阀组中的每一者都具有压裂阀。第一阀组和第二阀组中的至少一者具有弹性阀。使用单个封塞装置来打开第二阀组中的所有阀，但保持第一阀组中的所有阀关闭。