中国低渗致密储层压驱技术发展现状及关键问题OA

Fracturing-flooding technique is a key method for stimulation of low-permeability tight reservoirs,which can be divided into forward fracturing flooding and reverse fracturing flooding based on its mechanism.In order to clarify the primary engineering and technical challenges to be solved in fracturing-flooding process,research on the current development status and key issues of fracturing-flooding technique in China's low-permeability tight reser-voirs is carried out,systematically describing the background of fracturing-flooding technique.Forward fracturing-flooding mainly aims at low-permeability reservoirs with effective displacement between injector and producer,while reverse fracturing-flooding aims at tight reservoirs with poorer physical properties.The 2 techniques contrib-ute to the economic and efficient development of low-permeability tight reservoirs in China.Development history of fracturing-flooding technique in 4 stages is summarized,including matrix imbibition-oil-water displacement produc-tion stage,fracture-matrix dynamic imbibition production stage,fracture network fracturing-energy storage and per-meability increasing production stage and fracturing flooding-soaking imbibition production stage.From perspec-tives of engineering parameters and technical characteristics,3 major physical processes of fracturing-flooding tech-nology are revealed,including fracturing flooding injection,soaking imbibition and collaborative injection and pro-duction.Finally,based on field challenges of fracturing-flooding in low-permeability tight reservoirs,engineering problems of fracturing-flooding such as"displacement rate and water injection volume","soaking necessity and time","production system and energy replenishment timing"are summarized,and scientific problems such as"mechanisms of micro-fracture initiation and extension","physicochemical soaking imbibition mechanism"and"oil-water multi-fields coupling flow mechanism"are extracted.The research provides guidance for the fundamental theoretical study and field application of fracturing-flooding.