In the later stage of steam assisted gravity drainage(SAGD)development,the diffusion of steam chamber consumes a lot of energy.In order to improve the production ef-fect in the later stage of SAGD,the key parameters of combustion assisted gravity drainage(CAGD)technology were studied under the condition of existing double horizontal wells.Through reservoir numerical simulation,the productivity efficiency of different development methods,the timing of oil displacement mode conversion,and the influence of parameters such as combustion mode and gas injection speed after conversion are analyzed.The re-sults show that,(1)under the existing well pattern conditions,the injection energy of SAGD+CAGD is reduced by 73.86%,and the stable production period is extended by one year.(2)In the late stage of SAGD production,the gas injection rate of 20 000 m3/d was used for replacement,and the combination of dry combustion and wet combustion was used for development.The recovery rate was increased by 3.25%,which effectively improved the development effect of SAGD in the later stage.
关键词
稠油/重力泄油/提高采收率/接替时机
Key words
heavy oil/gravity drainage/enhance oil recovery/the timing of transfer
维普
万方数据