IMPROVING SWEEP EFFICIENCY IN A NATURALLY FRACTURED RESERVOIR WITH POLYMER GELS

摘要

The Norman Wells oil-producing reservoir, discovered in 1920, is located 450 m beneath the Mackenzie River in Canada's Northwest Territories, approximately 150 km south of the Arctic Circle. Development occurred only on the mainland and natural islands until 1981, when a major expansion project was initiated with the latest technology in artificial island construction and directional drilling to access the reservoir beneath the river. A fieldwide five-spot waterflood program was implemented, and pool production in 1985 increased from 475 to more than 4000 m~3/d. Currently, 164 active injectors and 170 producers average 4500 m~3/d of oil.