Abstract:

In some domestic heavy oil fields,water production decreased and oil production increased after oil well pump replaced by progressive cavity pump,but this method is unavailable in thin oil fields.An experiment was made to simulate the influence of pressure fluctuation at bottom hole on heavy oil outcome.Under the condition of constant pressure,heavy oil and formation water were simultaneously pumped into oil-saturated artificial core to simulate two-phase flow of oil and water in the reservoir.A solenoid valve was used in the exit to cause periodic pressure fluctuation.The liquid producing capacity was observed and compared with that of the non-fluctuated.It was discovered that the pressure fluctuation could increase water production,but it could decrease oil production.The comparison of in-situ productions using oil well pump and progressive cavity pump showed that the progressive cavity pump was superior to oil well pump for development of heavy oil.

Key words: progressive cavity pump, oil well pump, pressure fluctuation, heavy oil, oil outcome, water cut, experimental study

摘要：

国内一些稠油油田生产过程中将抽油泵更换成螺杆泵后产水减少,产油量增加,而该方法在稀油油藏应用,其产量变化不明显。为此,用实验模拟方法研究了井底压力波动对稠油生产的影响。在恒压条件下,将稠油和地层水同时注入饱和油的人造岩心中,模拟近井地带油藏在泵抽吸作用下油水两相流动特征,利用出口端的电磁阀产生和不产生周期性波动来分别模拟抽油泵和螺杆泵的生产过程。由产油、产水情况发现,波动状态下产水量高于不波动情况,而前者产油量小于后者,且随波动周期的增加,产水率增加而产油率减少。即抽油泵生产过程中压力波动增加了水的产出量;而螺杆泵连续地抽吸减少了水的产出量,增加了稠油产量。稠油开发中使用螺杆泵的效果优于抽油泵。

关键词: 螺杆泵, 抽油泵, 压力波动, 稠油, 产油量, 采水率, 实验研究