Study on nitrogen foam anti-water-coning technology for conventional heavy oil reservoir;

A laboratory research on nitrogen foam adjustment of oil displacement in Bohai heavy oilfields;

Development and application of nitrogen foam injection system on offshore oilfield;

Based on the microanalysis, it is found that the nitrogenous bubbles distribute along grain boundaries of columnar dendrites, and the slab cracking may be due to too high N content in the steel.

The new technique of injecting nitrogen-foam to enhance steam-thermal production result, which has such advantages as: wide gas source, cheap price, no corrosion, and unsophisticated process etc, represents the growing direction of current enhancing recovery factors.

In such circumstances,the nitrogen-foam profile control technology is developed in this paper.