青西油田多元复合吞吐研究与应用——以柳5X井为例

RESEARCH AND APPLICATION OF MULTIPLE COMPOSITE STEAM STIMULATION IN QINGXI OILFIELD-TAKING WELL LIU 5X AS AN EXAMPLE

文章针对青西油田埋藏较深,储层发育较薄,地下原油黏度高,且对热敏感,适合热采的特点,提出了结合水平井、降黏剂、氮气和蒸汽吞吐的多元复合蒸汽吞吐方法,进行了物理及数值模拟。物理模拟结果表明,氮气的高膨胀性可以补偿地层能量,储层中的氮超覆效应具有绝热作用,并经数值模拟证实。生产测试表明,复合蒸汽吞吐的组合效应可显著增加蒸汽波及体积、驱油效率和原油流动能力。借助这一技术,柳5X井已形成万吨级年产能,累计采出程度达到63%,标志着深层薄发育储层稠油的高速、高效开发。

Aiming at the characteristics of deep burial in Qingxi oilfield,thin reservoir development,high viscosity of underground crude oil,heat sensitivity and suitability for thermal recovery,a multiple composite steam stimulation combined with horizontal well,viscosity reducer,nitrogen and steam stimulation is proposed.Methods,physical and numerical simulations were carried out.Physical simulation results show that the high expansion of nitrogen can compensate the formation energy,and the nitrogen overburden effect in the reservoir has adiabatic effect,which is confirmed by numerical simulation.Production tests have shown that the combined effect of composite steam stimulation can significantly increase the steam sweep volume,oil displacement efficiency and crude oil flow capacity.With this technology,Well Liu 5 X has formed an annual production capacity of 10,000 tons,with a cumulative recovery of 63%,marking the high-speed and efficient development of heavy oil in deep and thin reservoirs.