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Brent油田从 70年代中叶开始开发 ,目前正走向其经济生命的终点。然而较大的剩余油储量———尽管只有原始储量的 4 0 % ,以及较高的油气比都使该油田可以通过降低油藏压力来延长开采寿命。这种降压措施将使油田增加约10～ 15年的经济生命。由于Brent油田的规模和复杂性 ,这种世界上独特的降压工程给油田带来了许多的不确定性。完井设计对于管理这些不确定因素异常重要。经济有效的油藏管理 (层间隔离 )是一个先决条件 ,而且所选定的完井设计应该适应砂、垢 ,甚至H2 S的管理。尤其是某些井将需要人工 (气 )举升 ,尽管这些井的数量和位置在很大程度上事先并不知道。所采用的单孔眼完井设计适应性强 ,资金投入少 ,简单易行 ,并可随时下入气举设备。与Brent油田以往采用的多级跨越式组合完井相比 ,单孔眼完井节省了 30 %的资金投入和6 5 %的施工时间。本文描述了这种完井的主要特点和气举方式。
Brent oilfield development since the mid 70s, is now approaching the end of their economic life. However, the larger remaining oil reserves - albeit only 40% of the original reserves - and the higher oil-gas ratios make it possible to extend the life of the field by reducing reservoir pressure. This step-down will increase the field’s economic life by about 10 to 15 years. Due to the size and complexity of Brent field, this unique buck project in the world has brought a lot of uncertainty to the oilfield. Well completion design is extremely important in managing these uncertainties. Cost-effective reservoir management (layer separation) is a prerequisite and the well completion design selected should be adapted to the management of sand, scale and even H2S. In particular, some wells will require manual (gas) lift, although the number and location of these wells are largely unknown in advance. The single hole used in well completion design adaptability, less capital investment, simple and easy, and at any time under the gas lift equipment. Compared with the multistage leap-forward combined completions that Brent Field used in the past, singlehole completions saved 30% of capital investment and 65% of construction time. This article describes the main features of this well completion and gas lift.