Sealing for External Channeling with Nitrogen Foam

In allusion to the problem of water out in water layer caused external channeling in oil wells,a laboratory simulation was conducted.80cm long core and its parallel model were used for experiments to avoid end effect of short cores.It was used to simulate the water channeling to reservoir from near wellbore and nitrogen foam was used to make a sealing test.Parameters of foam injection was selected,the intensity of sealing was evaluated,the injection is conducted by using the method of gas-foaming agent-gas.The result shows that the balanced pressure and gas-liquid ratio in alternating injection of water and gas is more efficient than that of foam sealing.