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单家寺稠油油藏已经进入多轮次吞吐中后期,油井生产效益逐周下滑,综合含水上升,汽窜加剧,油汽比下降。针对这一现状,2013年以来试验实施了氮气辅助吞吐工艺技术措施,通过建立地质模型、历史拟合、注氮方式筛选、确定注氮选井原则以及实际应用中如何编写设计、加强注氮现场管理等,在转周注汽前或注汽过程中向地层注入一定量氮气,实现提高单井吞吐效果的作用。应用表明,氮气辅助吞吐工艺技术措施能够扩大蒸汽及热水带的加热油层体积,调整纵向吸汽剖面,减少蒸汽热损失,从而有效提高稠油井周期吞吐效果,实现稠油油田“精细开发、效益开发”。
The single-reservoir heavy oil reservoir has entered the middle and late stages of multiple rounds of stimulation, and the production efficiency of oil wells has decreased week by week. The comprehensive water cut increases, the gas-steam channeling intensifies and the oil-steam ratio decreases. In response to this situation, we have experimented with technical measures of auxiliary nitrogen production since 2013, and established the geological model, historical fit, nitrogen injection method to determine the principle of nitrogen injection, and how to write the design and strengthen the nitrogen injection site Management, etc., Injecting a certain amount of nitrogen into the stratum before the steam injection or gas injection during the turnaround, and realizing the effect of improving the single-well throughput. The application shows that the technical measures of nitrogen auxiliary throughput processing can expand the volume of the heated oil layer in the steam and hot water zone, adjust the longitudinal suction profile and reduce the heat loss of the steam, thereby effectively increasing the cyclic throughput effect of the heavy oil well and realizing the “fine development, Benefit Development ”.