Abstract: After the XQ⁃45 block entering the multiple rounds of steam huff and puff, it is affected by edge water, faults, reservoir properties and other factors. The remaining oil distribution is complex, and steam huff and puff effect is getting worse. According to the reservoir dynamic data, the 79 wells in this block are divided into different types of heavy oil wells according to the remaining oil saturation parameters. Among them, the number of remaining oil wells affected by edge water is more than 22. As the edge water proceeds along the high⁃permeability layer to the oil well, the water content rises quickly and easily causes flooding. To further improve the effect of steam huff and puff, aim at the unutilized section in the edge water affected oil well, and take the single⁃layer steam huff and puff mode to study the optimization of steam huff and puff parameters affected by edge water. Through extract single⁃well geological model and compare different steam injection programs, the best program is selected: steam injection volume is 100 t/m, the oil steam ratio maintain at 0.2 t/t or more, obtain the maximum amount of oil production. The results show that cycle steam injection volume is 100 t/m, the oil production is the largest in the third cycle, and the sweep radius of steam reaches the maximum. After 5 rounds of steam huff and puff, cumulative steam injection volume is 3 700 t, cumulative liquid production is 4 500 t, cumulative oil production is 738.65 t, and the program implementation effect is getting better.

Key words: Steam huff and puff, Edge water, Single?layer production, Heavy oil, Remaining oil, Tapping potential

摘要： XQ⁃45区进入多轮次蒸汽吞吐阶段后，受边水、断层、储层性质等因素的影响，剩余油分布复杂，吞吐效果越来越差。结合油藏动态数据，依据剩余油饱和度参数的不同将该区块79口油井划分为不同类型稠油井。其中，受边水影响的稠油井较多（22口），边水沿高渗层向油井推进过程中，油井含水率上升较快易造成水淹。为进一步改善蒸汽吞吐开发效果，针对边水影响型油井中未水淹层段，采取单层蒸汽吞吐的方式来研究边水影响的蒸汽吞吐参数优化。通过提取单井地质模型，对比不同注汽方案，优选出最佳方案，即：注汽强度为100 t/m，油汽比将保持在0.2 t/t以上，可获得最大采油量。结果表明，周期注汽强度为100 t/m时，周期产油量在第3轮次达到峰值，蒸汽波及半径达到最大值。吞吐5个轮次后，累注汽量3 700 t，累产液量4 500 t，累产油量738.65 t，方案实施效果较好。

关键词: 蒸汽吞吐, 边水, 单层开采, 稠油, 剩余油, 挖潜