Abstract
AbstractThe problem of extinguishing oil layer seriously affects the developing effect of fire flooding, it is necessary to reignite in time. In order to make clear the reason of extinguishment, optimize the technical parameters and realize the reignition of extinguishing oil layer, the study firstly analyzed the parameters such as injected volume and pressure, gas composition of producing well in Wellblock Hongqian-1, which clarified the reason of fire extinguishing. Whereafter, the minimum temperature of reignition after short-time extinguishment were investigated by physical simulation experiments. For selecting the kinds of auxiliaries suitable for Hongqian heavy oil, The thermogravimetric behavior of heavy oil with N-hexadecane, paraffin oil and castor oil was studied by means of a synchronous thermal analyzer. The study shows that the main reasons of extinguishment are lack of effective connectivity between injection and production wells, as well as the large fluctuation of injected parameters. Moreover, the extinguishing well in Wellblock Hongqian-1 can be reignited at 250 ℃. Paraffin oil and castor oil are helpful to ignite fire-extinguishing oil layer and promote high temperature oxidation process of Hongqian heavy oil. The study provides certain guiding significance to maintain productive stability and realize the reignition of extinguishing oil layer for Wellblock Hongqian-1.KeywordsFire floodingExtinguishing reasonReignitionPhysical simulationTemperatureCombustion-supporting agent
Published Version
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