Refracture in the same layer of an old well and reperforation fracture in unproducing strata are the major stimulations in oilfield development.

• 老井同层重复压裂和未动用层补孔压裂是开发过程中的主要增产措施,随着油田开发的逐步深入,地下油水分布越来越复杂,压裂选井、选层的难度越来越大。