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为改善过渡带地区的开发效果,在北过三四条带开展了蒸汽驱现场试验。在试验区转注蒸汽1年后,整体未见增油效果,但部分油井采出液温度上升幅度较大,出现蒸汽突进的现象。分析其原因,主要是蒸汽及热水的窜进造成的。汽窜产生的原因主要有地层压力不均衡、注采井距差异、地层构造影响、储层非均质性和注汽操作不当等。此外,蒸汽干度过低、注入体系不易压缩还会造成热水窜。通过分析比较凝胶类高温调剖工艺、高温泡沫调剖工艺、双激发无机非金属调剖工艺、分层注汽工艺、动态调整控制技术等汽窜防治的主要措施,给出了不同汽驱阶段的优化措施。对试验区内两口采油井——北4-30-RB263井、北4-3-B63井进行了汽窜原因案例分析,并提出了解决对策。鉴于稀油油藏的井段长、小层多,井筒中蒸汽超覆严重,汽窜控制难度大,建议初期试验应采用高温调剖技术。
In order to improve the development effect of the transitional zone, steam field tests were carried out in the north three or four zones. One year after the steam injection in the pilot area, the whole did not see the effect of oil increase, but some of the oil well fluid temperature rise is larger, the phenomenon of steam sudden phenomenon. Analysis of the reasons, mainly caused by steam and hot water channeling. The causes of steam channeling are mainly the imbalance of formation pressure, the difference of well spacing between injection and production, the influence of stratum structure, reservoir heterogeneity and improper steam injection operation. In addition, the dryness of the steam is too low, the injection system is not easy to compress and will also cause hot water channeling. By analyzing and comparing the main measures such as geothermal high temperature profile control technology, high temperature foam profile control technology, double excitation inorganic nonmetal profile control technology, stratified steam injection technology and dynamic adjustment control technology, Optimization of the stage. In the test area, the two oil production wells - North 4-30-RB263 well and North 4-3-B63 well were analyzed for the reason of gas channeling, and some countermeasures were put forward. In view of the fact that thin oil reservoirs have long well sections with small sub-layers and serious steam overrun in wellbores, it is very difficult to control steam tapping. It is suggested that high-temperature profile control techniques should be adopted in initial tests.