论文部分内容阅读
针对Ⅹ底水油藏油井注水后综合含水上升过快的问题,利用HB70/300型高压物性分析仪开展了该区块原油相态特征实验、注气相态特征实验,并运用细管法开展了注CO_2最小混相压力实验。对比分析了CO_2和N_2两种性质气体注入前后原油的相态特征变化,确定了该区块原油注CO_2最小混相压力,为Ⅹ油藏注气提高采收率可行性提出依据。实验结果表明,Ⅹ油藏原始地层压力为46.01MPa,原油饱和压力为11.06 MPa,注N_2后饱和压力上升迅速,在原始地层条件下难以实现混相,表现出典型的非混相特征;注CO_2后饱和压力上升较平缓,细管法测得的最小混相压力为28.03 MPa,说明利用CO_2可实现CO_2的混相驱替,而且最终的驱替效果比较理想。说明该油藏可开展注CO_2混相驱,为进一步的开发方案调整提供了依据和合理的建议。
Aiming at the problem that the comprehensive water cut of the water in the bottom water reservoir is too fast after water flooding, the phase character experiment of crude oil and gas injection phase state characteristics of the block are carried out by HB70 / 300 high-pressure physical analyzer. Note CO 2 minimum mixed pressure test. The change of phase characteristics of crude oil before and after CO_2 and N_2 gas injection were compared and analyzed. The minimum miscibility pressure of crude oil injected into this block was determined and the feasibility of gas injection enhanced recovery was put forward. The experimental results show that the initial formation pressure of Ⅹ reservoir is 46.01 MPa and the saturation pressure of crude oil is 11.06 MPa. The saturation pressure increases rapidly after the injection of N 2. It is difficult to realize the mixed phase under the original formation conditions, showing typical non-miscibility characteristics. The pressure increase is relatively gentle. The minimum miscibility pressure measured by the thin tube method is 28.03 MPa, which indicates that CO_2 can be used to drive the CO 2 flooding and the displacement effect is satisfactory. It shows that the reservoir can carry out CO 2 flooding and flooding, which provides the basis and reasonable suggestions for further development plan adjustment.