Impact of gas property on gas drive in extremely low permeability oil reservoir—A case study of Block Fang48 in Daqing Oilfield
Impact of gas property on gas drive in extremely low permeability oil reservoir—A case study of Block Fang48 in Daqing Oilfield
复制标题
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Sun Zhong-xin
中科院分区：
文献类型：
--
作者：
Sun Zhong-xin
大庆油田方48区块为特低渗透油藏。采用水、CO2、N2、天然气等驱替介质对长岩心驱替进行物理模拟，确定气型对该类储层开发响应的影响。结果表明，方48区块注水能力低，突水时间早，含水率上升快。在气驱条件相同的情况下，CO2和天然气驱采收率、排油速率和注气量均高于N2驱，而产气油比低于N2驱。因此，气驱开发方48的最佳方法是CO2驱油；其次是天然气驱动。由于CO2对设备具有腐蚀性，在选择CO2驱油时应考虑防腐措施。
Block Fang48 in Daqing Oilfield is an extremely low permeability oil reservoir. Physical modeling of long core displacement has been performed by using displacing media such as water, CO2, N2 and natural gas to determine the impact of gas type on development response of such reservoirs. The result shows that, Block Fang48 has low water injection capacity, water breaks through in an early time, and water-cut rises rapidly. In gas drive, under the same condition, CO2 and natural gas drives have higher recovery factor, oil draining rate and gas injection capacity than N2 drive, while with producing gas-oil ratio lower than that of N2 drive. Therefore, the optimal method of gas drive for developing Fang48 is CO2 flooding; the next is natural gas drive. As CO2 is corrosive to equipments, anti-corrosive measures shall be considered when selecting CO2 flooding.