Methods Study on Gas Channeling of In Situ Combustion Development in Developed Heavy Oil Reservoir

Now in situ combustion became one of the ways for the developed heavy oil reservoirs to convert development pattern and improve recovery. After long time steam huff and puff development in heavy oil reservoir, it was obvious that there was a big change on the oil zones and reservoir properties and the reservoir heterogeneity. When it was converted to in situ combustion, the injection gas often break through along the high permeability layers in the fire drive wells that make the sweep area smaller and decrease the reservoir recovery. By analysis on the gas channeling of in situ combustion occurred in the heavy oil reservoirs, the methods was put forward to develop heavy oil reservoir using in situ combustion reasonably including well space infilling, controlling the gas injection rate, adding roam surfactant agent and using fire drive with horizontal well assisted etc. to prevent the condition of gas channeling occurring. It will greatly improve the success and adaptability of the in situ combustion used in vertical wells of the heavy oil reservoir by using these methods. It also will build on basis of the heavy oil reservoir converted to in situ combustion development.