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辽河油田超稠油水平井蒸汽吞吐进入中后期开采阶段,逐渐暴露出水平段动用不均、吞吐效果差等开发矛盾。分析认为,由于蒸汽超覆作用,水平段各井段区域储层非均质性差异大,吸汽强度不均,井间汽窜严重;近井地带地层存水增多,含油饱和度下降;油层亏空加大,地层压力下降,油层供液能力不足。依据水平井温度监测资料,合理判断水平段剖面动用状况,采用分段注汽工艺技术,独立分隔水平段注汽腔,灵活分配注汽量,实现对水平段不同区域分段均匀注汽。并通过注入高温复合调剖剂,辅助分段注汽进行蒸汽吞吐,有效封堵水平井段局部大孔道高渗透区域,补充地层能量,抑制汽窜发生,提高蒸汽波及半径,调整水平段动用剖面,实现水平段均匀吸汽,近而起到降黏、驱油助排和提高动用程度的作用,达到改善开采效果的目的,为油田开发持续稳产提供技术依据。
Liaohe Oilfield super heavy oil horizontal well steam huff and puff into the middle and late stage of exploitation, and gradually exposed the uneven use of the horizontal section, poor throughput and other development contradictions. The analysis shows that due to the effect of steam overburden, reservoir heterogeneity in each section of the horizontal section is large, and the steam suction intensity is not uniform, and there is a serious gas channeling between the wells. The reservoir water in the near-well zone increases, and the oil saturation decreases. Shortage increases, strata pressure drops, lack of capacity for liquid reservoir. Based on the monitoring data of horizontal well temperature, the section utilization status of horizontal section is reasonably judged, and the sub-section steam injection process technology is used to separate the horizontal section steam injection chamber flexibly and to distribute the steam injection quantity evenly to achieve the uniform steam injection in different sections of the horizontal section. And through the injection of high-temperature compound profile control agent, auxiliary steam injection sub-steam steam hunt, effectively blocking the horizontal section of large horizontal wells high permeability zone, to supplement the formation energy to inhibit the steam channeling occurs to improve the steam wave radius and adjust the horizontal section of the dynamic profile So as to achieve even suction in the horizontal section and to play the role of viscosity reduction, oil displacement and utilization enhancement to achieve the purpose of improving the mining effect and provide a technical basis for the continuous and stable production of the oilfield.