水平井开采底水油藏水脊脊进规律的物理模拟

采用现代电子摄像监视技术和流动测试手段，建立水平井二维物理模拟系统，观察水平井开采底水油藏时水脊脊进过程，研究水脊形成与发展机理、见水时间和采收率的变化规律。水平段长度较小时，较短时间内就形成了水脊，水脊的两翼比较陡，油水界面变形较大。水平段长度较长时，水脊形成时间推迟，两翼逐渐变缓且对称分布。随着水平段长度增加，水平井生产时见水时间推迟，无水采收率和最终采收率增加。水平段长度相同时，随实验压差增大，底水脊进形成水脊时间提前，水脊的发展速度加快，水平井见水时间提前，水脊两翼界面变陡，无水采收率和最终采收率减小。图8参14

2-D physical modeling of water coning of horizontal well production in bottom water driving reservoirs

A 2D visible physical model of horizontal well production was set up using the advanced electronically monitoring technology and flow testing tools to investigate the fluid flow in bottom water driving reservoirs during horizontal well production. The formation and development of water coning were visualized, and the effect of water coning on water breakthrough times and recovery ratios was studied. When horizontal section is short, the water coning is formed in a short time, the two shoulders of the coning are steep and the oil/water interface deforms greatly. When horizontal section is long, the water coning is formed in a long time, the two shoulders of the coning are gentle and distributed symmetrically. With the increasing of horizontal section length, the water breakthrough time delays, the water free recovery and the ultimate recovery increase. The increase of producing pressure shortens the production period before water breakthrough, and decreases both water free recovery and ultimate recovery.