长春弱挥发油油藏的开发经验

长春油田是1988年发现的弱挥发油油藏,油田属于断块油气藏,油田开发采取边外注水,高速开发的政策。1990年达历史最高年产油量63.4×10⁴t,1994年降为7×10⁴t,1999年已降到2.85×10⁴t,综合含水从初期的不含水增大到86.3%,油田处于晚期开发。油田开发表现的特征与溶解气驱开发类似。预测采收率仅为27%左右,较数值模拟理想方案低23%。针对以上问题,阐述了该油藏的地质特点和烃类流体类型,总结了油田开发的历程、开发特征和开发经验。提出了开发挥发油及弱挥发油油藏,保持饱和压力以上是开发好此类油藏的关键,应列为此类油藏开发的最重要原则。强调了数值模拟技术在油气藏开发中的重要作用。

EXPERIENCE OF CHANGCHUN VOLATILE OIL RESERVOIR DEVELOPMENT

Changchun Oilfield is a weak volatile oil reservoir found in1988. It belongs to faulted oil and gas pool. The oilfield adopted the policy of outer edge waterflood and high-speed development. The maximum production,which was 63.4×104t in 1990, dropped to 7×104t in 1994, and 2.85×104t in 1999.The composite water cut changed from zero to 86.3%. The oilfield is now in the late stage of development. The features showed during the development resemble that in dissolved gas drive. Recovery efficiency is forecasted only 27%,23% lower than the ideal plan of numerical simulation. This paper expatiates the geological characteristic and types hydrocarbon's fluid in the oilfield and summarizes the course,features and experience in the oilfield development. It also concluded that the key issue for developing volatile oil reservoir and weak volatile oil reservoir is to keep reservoir pressure higher than saturation pressure. The importance of numerical simulation in the development of hydrocarbon reservoir is emphasized.