深水立管气举效果影响因素模拟分析

以西非某深水油田为研究对象,利用OLGA及PVTsim商业软件,对水深、气油比、含水率、输量以及管道出口压力等影响深水立管气举效果的因素进行了模拟分析。气举能有效地降低深水立管底部压力;在一定范围内,注气量的增大能有效地减小深水立管底部压力波动,但注气量并不是越大越好,每种工况对应一个最优注气量;在油田生产后期,随着含水率增大和管道入口处流体气油比减小,立管底部注气带来的压降获益效果越明显;输量越小,气举效果越好;管道出口压力越大,气举效果越好。

Simulation and analysis of the parameters impacting the performance of deepwater riser gas lift

The parameters impacting the gas lift performance in the development of deepwater oilfield,such as water depth,gas oil ratio,water cut,flowrate and outlet pressure,have been simulated and analyzed with the commercial software OLGA and PVTsim based on the background of a deepwater oilfield in West Africa.It is indicated that the gas lift injection can lower the riser bottom pressure significantly;increasing gas lift injection rate can mitigate the riser bottom pressure fluctuation within a certain range,while the gas lift injection rate is not the greater the better and the optimum gas lift injection rate is different for different scenario;in later production stage,the effect of gas lift injection in dropping riser bottom pressure becomes more obvious along with the water cut increase and GOR decrease of the inflow fluid,so that the lower is the flowrate,the better is the gas lift performance and the higher is the outlet pressure,the better is the gas lift performance.