Influencing factors of delayed cross linking system in deep profile control

Key words:  multiple emulsion cross linking agent  water in oil in water (W₁/O/W₂)  gel behavior  sealing capacity  delayed cross linking

Abstract:

The influences of various factors on gel behavior and sealing capability of water in oil in water(W₁/O/W₂)multiple emulsion cross linking gel system were evluated through lab and physical simulation experiment. The results show that compared with the Cr(AC)₃ without coating, the new cross linking agent can delay cross linking for the polymer, and advantages to deep profile control. With the increase of mass concentration of polymer, mass concentration of cross linking agent and temperature, the gel time reduces and gel strength increases. With the increase of salinity, the gel time shortens first and gets longer afterwards, and the gel strength weakens first and increases afterwards. The sealing capacity presents a tendency of linear increase with the increase of mass concentration of polymer and cross linking agent, and the cross linking agent has a greater impact. With the increase of permeability, the sealing capacity reduces in linear relation for the log log plot.