海上油田蒸汽吞吐化学增效技术研究

在海上油田蒸汽吞吐技术的探索与实践过程中,由于部分稠油油田的地质油藏特性、钻完井方式、平台空间及操作成本等因素的制约,导致海上油田蒸汽吞吐的应用难度高于陆上油田。蒸汽吞吐化学增效技术通过在传统蒸汽吞吐注入流体的基础上添加化学增效复合药剂的方式,能够在热采效果的基础上,扩大波及体积、提高热采洗油效率以及降低原油黏度,从而改善稠油油田的蒸汽吞吐开发效果。从化学增效机理、室内物理模拟以及渤海某油田数值模拟实例的角度,探讨并评价了该技术的提高采收率效果和经济性。基于渤海油田某区块矿场试验方案数值模拟计算结果显示,经过7个周期热采化学增效剂吞吐,在常规热采基础上增油幅度达16%,投入产出比达1∶6.3(油价按40美元/桶计)。该技术成果为深入开展海上油田热采技术开发奠定了基础,并为海上稠油高效开发提供了新的思路和方法。

Study on Chemical Enhanced Steam Huff and Puff for offshore oilfield

In the course of exploration and practice for offshore oilfield steam huff and puff, for the restriction of reservoir conditions, drilling mode, platform space as well as operational cost, the application of steam huff and puff for offshore oilfield is more difficult than onshore oilfield. Chemical enhanced steam huff and puff could expand swept volume, improve swept factor, decrease the viscosity of heavy oil, thus improve development effect. This article mainly discusses and evaluates the effect of recovery and economy for this technology from mechanism, laboratory physical simulation and numerical simulation base on actual geologic model of some Bohai oilfield . The results shows the oil production is improved by 16% on the basis of conventional steam huff and puff after 7 cycles of chemical enhanced, the input-output ratio is up to 1:6.3(oil price by $40 / barrel). This technology lays a solid foundation for deepening thermal recovery and affords new methods for offshore oilfield heavy oil high efficiency development.