In order to understand the effect,action law and recovery mechanism of carboxamide-assisted steam huff and puff in actual formation,physical simulation experiments were carried out.Carbonamide-assisted steam huff and puff experiment is to use a large-scale three-dimensional sand-filling experimental device to simulate the formation and reservoir conditions by using a physical model,and to study the effects of injection timing,injection rounds,steam injection amount and carboamide injection amount on the actual oil recovery effect during carbonamide-assisted steam huff and puff.The results show that injecting carboxamide at the early stage of steam huff and puff can greatly improve the cyclic oil recovery,which is 79.3%higher than that of the previous cycle.Increasing the number of carboxamide injection rounds can ensure that the single-round recovery rate and oil-steam ratio are at a high level,thus improving the ultimate recovery rate;After reducing the steam injection,the carboxamide is not fully decomposed under the formation conditions,resulting in poor recovery effect and a reduction of cyclic recovery by nearly 50%.After reducing the injection amount of carboxamide,the insufficient injected reactants led to insufficient decomposition products of carboxamide,which failed to play a good role,and the oil-steam ratio and recovery ratio were low.
关键词
碳酰胺/蒸汽吞吐/物理模拟实验/蒸汽吞吐参数优化/采收率
Key words
Carbonamide/Steam huff and puff/Physical simulation experiment/Optimization of steam huff and puff parameters/Recovery ratio
维普
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