高含水油田油井常温输送节能技术研究

Research on the energy conservation technology of oil well transmission at normal temperature in high water-cut oilfield

为降低高含水油田集输系统的单位能耗,提高能量利用率。以某油田典型油井为研究对象,在现场停止掺水或伴热流程,观察温度、压力、流型与原油黏壁现象之间的关系,并对黏壁起始温度与原油凝点、含水率、剪切应力之间的关系进行了非线性回归,针对图版工具在现场对集输工艺进行优化。结果表明,产液量越大、含水率越高,油井实现常温输送的可能性越大;该油田原37口油井采用的三管伴热工艺被取消,双管掺水和环状掺水工艺的掺水量均有所降低,平均吨液耗电量下降至2.5 kWh,吨液耗气量下降至5.7 m^(3),每年可减少运行费用4824万元。

In order to reduce the unit energy consumption of gathering and transportation system in high water-cut oilfield and improve the energy utilization rate,taking a typical oil well in an oilfield as the research object,the water blending or heat tracing process is stopped in the field,and the relationship between temperature,pressure,flow pattern and the viscous wall phenomenon of crude oil is observed.The relationship between the viscous wall initial temperature and the crude oil freezing point,water content and shear stress is nonlinear regression.The gathering and transportation process is optimized in the field based on the chart tool.The results show that the higher the liquid production is and the higher the water cut is,the greater the possibility of realizing normal temperature transmission is.The three-pipe heat tracing process used in the original 37 oil wells in the field is canceled.The water blending amount of double-pipe blending and annular blending process is reduced.The average power consumption per ton of liquid is reduced to 2.5 kWh,and the gas consumption per ton of liquid is reduced to 5.7 m^(3),which could reduce the annual operating cost by 48.24 million yuan.