The formation pressure and production of horizontal wells in tight reservoirs decrease rapidly after several rounds of water injection huff and puff.Facing the challenge of water injection difficulty and fracture-to-fracture in-terference of horizontal wells in tight reservoir,from the aspects of well pattern,string design and injection-produc-tion system,taking tight-reservoir Block M as an example,fracture-to-fracture stimulation method of horizontal wells is studied by using mechanism of natural fracture propagation induced by water injection,areal water injection method and principle of injection-production in same well.Multi-well fracture-to-fracture areal water injection devel-opment method is proposed to design string technique matching actual block.2 injection-production systems are set up including simultaneous injection-production system and asynchronous injection-production system,simulates ac-tual well pattern production for 10 a,and discusses feasibility of fracture-to-fracture areal water injection develop-ment method with several indexes.Case analysis results show that fracture-to-fracture areal water injection method can promote uniform radial advance of injected water,eliminate fracture-to-fracture interference,expand injected water sweep range,enhance displacement effect,and greatly increase cumulative oil production.The research pro-vides basis for fracture-to-fracture areal water injection development of horizontal wells in tight oil reservoirs.
关键词
致密油藏/水平井/面积注水/缝间增产/类反七点法
Key words
tight oil reservoir/horizontal well/areal water injection/fracture-to-fracture stimulation/inverted sev-en-spot well pattern
维普
万方数据