摘要
超低渗油藏由于孔喉极细,即使高压注水,也难以保持注采平衡,应考虑注气的可行性。文中进行了水驱油和氮气驱油试验,以比较驱替效果,探究超低渗油藏的驱替机理。结果表明,对于小于1×10-3μm2的超低渗岩心,气驱比水驱效果好,气驱平均采收率为27.9%,水驱平均采收率为24.1%。说明注气具有一定的优越性。
To maintain a balanced injection and production rate in ultra - low permeability reservoirs is very difficult even when applying a very high pressure water injection, due to the very fine pore throats, therefore the feasibility of gas injection should be considered. Water - drive and nitrogen - drive experiments are performed to compare their displacement effects and study the displacing mechanism of ultra - low permeability reservoirs. In core with an ultra - low permeability of 1×10-3μm2 , the average recovery factor of gas drive is 27. 9% , 3. 8 percentage points higher than the 24. 2% of water drive, indicating that gas drive is advantageous to some extent.
出处
《河南石油》
2005年第3期38-39,i003,共3页
Henan Petroleum
关键词
超低渗油藏
注采平衡
注气
可行性
水驱油
气驱油
采收率
ultra -low permeability reservoir, balanced injection and production rate, gas injection, feasibility, water drive, gas drive, recovery factor
