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AA区块属于低渗透难采储量,为欠压油藏,压力系数只有0.87,针对低渗透欠压油藏递减快、稳产难、采收率低的特点,采取了超前注水开发。在油藏工程和数值模拟研究基础上,对水井超前注水时间、注水PV数、注水压力、注水强度等参数进行设计,AA区块投产后,取得了明显效果。超前注水技术成为提高欠压油藏开发效果的有效技术手段,为同类油藏开发起指导作用。
The AA block belongs to the low-permeability and non-recoverable reserves, and is under-pressured reservoir with a pressure coefficient of only 0.87. Aiming at the characteristics of low-pressure and under-pressure reservoirs decreasing rapidly, stable production and low recovery, a pre-injection development has been adopted. On the basis of reservoir engineering and numerical simulation, the parameters of advanced water injection time, water injection PV number, water injection pressure and water injection intensity were designed. After the AA block was put into operation, the obvious effect was achieved. Advance water injection technology has become an effective technical means to improve the development of under-pressured reservoirs and play a guiding role in the development of similar reservoirs.