稠油油藏点火温度对驱油效率的影响OA

As a pontential technique to significantly enhance oil recovery in heavy oil reservoirs,in-situ combustion(ISC)still faces challenges in achieving efficient ignition,which limits its large-scale application.In view of prob-lems of the complex distribution of water bodies in reservoirs during the late stage of steam flooding development and unclear combustion characteristics and influencing laws of ultimate displacement efficiency at different ignition temperatures,one-dimensional combustion tube experiment is conducted to study the dynamic combustion charac-teristics of target reservoirs at different ignition temperatures,analyzing the ISC effect in different conditions from 3 aspects including temperature propagation characteristics,oil wall formation patterns and ultimate displacement ef-ficiency.The results show that at lower ignition temperature,the fuel deposition time is longer and oil wall forms lat-er,with smaller oil wall thickness and higher ultimate displacement efficiency.Water in the reservoir enhances heat transfer efficiency during ISC process but reduces the intensity of combustion,shortening the effective combustion distance and reducing displacement efficiency,with more obvious effect at higher ignition temperature.Therefore,the ignition temperature should be appropriately reduced to achieve higher displacement efficiency for heavy oil res-ervoirs after steam flooding.The research provides lab reference for ignition parameters for ISC technique to en-hance oil recovery in current reservoir water cut conditions in NY oilfield.