安哥拉B1506区块深海油气田水下多相泵设计因素考量

为提升安哥拉B1506区块边际油藏开发潜力,解决边际油田长距离管道输送带来的流动保障等问题,水下多相增压泵的选择和应用成为最合理的选择。此文通过对安哥拉B1506区块油藏条件和流体性质的分析,以油藏模型(Eclipse)为约束,结合系统网络模型(Gap)的研究结果,为满足油藏采收率和最大含气量的要求,分析确定了多相泵吸入压力:并通过模拟开发生命期内管线温度,确定了管线的设计最大温降,并制定了保温措施以避免管道内产生析蜡、水合物堵塞等流动问题;同时,通过分析确定多相泵与已建气举模块的逻辑关系,达到与已建FPSO系统匹配的目的,以实现油田减产、关停等情况下的系统的平稳运行。通过对1506区块多相泵选用的相关因素分析,确定了深水多相泵设计的参数和工艺流程,为国内深水边际油气田的开发提供技术储备。

Design Consideration on the Subsea Multiphase Pump System in B1506 Block of Angola Deep Water Oilfield

In order to increase the development potential of B1506 Block marginal reservoir in Angola,subsea multiphase pump is selected to guarantee fluid flowing during long distance pipeline transportation.Through analysis of reservoirs conditions and fluid properties in B1506 Block,the suction pressure of multiphase pump has been determinated under the constraint of Eclips model combined with the study result of network model（Gap） to satisfy the requirements for increasing reservoir recovery and gas contents.In addition,by simulation the temperature of transportation system within full period of oilfield development life,the lowest temperature drop of the pipeline has been designed.Accordingly,the specific thermal insulation measures are designed to avoid obstruction in flow line due to wax deposit and hydrate precipitation.To match operational condition of existing FPSO system,the simulation study was conducted to define logic relation between multiphase pump system and gas lift model so that to guarantee stable operation during slowdown and turnaround period.The parameters and process flow of multiphase pump are finalized by analyzing the related factors.This study can provide technical reserves for development of deepwater oilfields in China.