Laboratory evaluation of further enhanced oil recovery in dissolved gas flooding reservoir

Dissolved gas flooding is a development stage depending on the formation's energy in the reservoir.The practice of reservoir development shows that the recovery of dissolved gas flooding is generally 5%～25%,a lot of crude oil still remains in the stratum after dissolved gas flooding.Therefore,other measures must be adopted to further enhanced oil recovery.The author uses PVT and modern physical simulated experimental method to assess the applied effectiveness of the further enhancing recovery technique in one dissolved gas-flooding reservoir in Indonesia.The research results show that,for homogeneous model,the recovery of dissolved gas flooding is 21.2%,after it,the recovery that can be further enhanced is 29.4% by gas flooding and is 33.2% by water flooding and is 42.5% by polymer flooding.For heterogeneous model,the average recovery of dissolved gas flooding is 14.7%,after it,the recovery that can be further enhanced is 24.0% by gas flooding,is 22.5% by water flooding and is 41.9% by polymer flooding.The experimental results also show that the recovery can be further enhanced by 6%～10% through declining back pressure after polymer flooding.We can see from what mentioned above,gas flooding,water flooding,polymer flooding and declining flow pressure all can enhance recovery to a great degree,they are effective measures to further enhance recovery in dissolved gas flooding reservoir.