The Feasibility Study On Air Injection Assisted Cyclic Steam Of Leng M Block

Leng M block is a typical heavy oil reservoir, and it has entered the middle and later stage of steam huff and puff. Nowadays, the oil field faces many problems, such as reservoir pressure level is decreasing, the poor capability of feed flow, the obvious contradiction between inter-layer and plane. Injecting air as a way to replace after steam injection development, it costs lower and does little harm to the environment.Moreover the air can also play a role in modifying crude oil. For the huff and puff development effect is not ideal, carrying out the research on air injection assisted cyclic steam is very meaningful.This paper derives air assisted cyclic steam motion equation and analyzes the feasibility on theory. And it has also uses numerical simulation method to compare this two different methods, and ensures the changes of the temperature field、pressure field、oil saturation field.This paper also analyzes the influencing factors. These factors conclude the permeability、the oil saturation、the intensity of gas injection、the timing of gas injection、the way of gas injection,and these results can provide the guidance to the design of the plan.This paper builds the fine geological model and numerical simulation model.Based on the huff and puff history matching, this paper makes a prediction on the development effectiveness and provides some technonlg and experiment to the oil field. The result of the research shows that: compared with the normal huff and puff method, this method can improve the oil recovery by 2-3 percent.