发明名称 |
Method for recovering waterflood residual oil |
摘要 |
A method for recovering waterflood residual oil from a waterflooded oil-bearing subterranean formation penetrated from an earth surface by at least one well by injecting an oil miscible solvent into a waterflood residual oil-bearing lower portion of the oil-bearing subterranean formation through a well completed for injection of the oil miscible solvent into the lower portion of the oil-bearing formation; continuing the injection of the oil miscible solvent into the lower portion of the oil-bearing formation for a period of time equal to at least one week; recompleting the well for production of quantities of the oil miscible solvent and quantities of waterflood residual oil from an upper portion of the oil-bearing formation; and producing quantities of the oil miscible solvent and waterflood residual oil from the upper portion of the oil-bearing formation. The formation may have previously been both waterflooded and oil miscible solvent flooded. The solvent may be injected through a horizontal well and solvent and oil may be recovered through a plurality of wells completed to produce oil and solvent from the upper portion of the oil-bearing formation.
|
申请公布号 |
US5826656(A) |
申请公布日期 |
1998.10.27 |
申请号 |
US19960642743 |
申请日期 |
1996.05.03 |
申请人 |
ATLANTIC RICHFIELD COMPANY |
发明人 |
MCGUIRE, PATRICK L.;ANDERS, JOSEPH L. |
分类号 |
E21B43/25;(IPC1-7):E21B43/25 |
主分类号 |
E21B43/25 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|