Nitrogen Foam Flooding Technology

Nitrogen foam flooding is inject foam agent into formation with nitrogen at the same time.It works together to improve recovery. At present, the indoor research and evaluation of this technology is relatively mature, and it has been implemented on a certain scale in various oilfields, and the effect is relatively good as a whole.

1.The Mechanism of Nitrogen Action

2.CASE

In December 2009, the nitrogen foam flooding technology was implemented in Changqing oilfield. This technology causes production decline obviously slowed down in the pilot test area.With 10 effective wells ( 48 % effective ratio ), the injection pressure is increased, and the contained water cut was obviously restrained. The average water cut is decreased from 72.2 % to 57.0 %, the average daily oil production per well increased from 1.56 t to 1.99 t, and the stage recovery increased by 5 %. The oil production of one single well increased from 0.24 t to 2.68 t, and the water cut decreased from 61.9 % to 29.5 %. The formation pressure is decreased from 13.4 MPa to 14.3 MPa, pressure maintenance level is increased from 113.9 % to  117.4 %