What are preformed particle gel plugging agents (PPGs)?

Preparation and application of preformed particle gel plugging agents Compared to in-situ gels, the preformed particle gels (PPGs) profile control technique offered easier control and implementation, making it suitable for deep profile control in complex reservoir conditions.

Can polyacrylamide nano-microspheres improve oil recovery?

Cite this: Energy Fuels 2023, 37, 1, 204–213 As a new kind of water plugging and profile control agents, the polyacrylamide nano–microspheres have been experimentally applied and achieved satisfactory preliminary results in enhanced oil recovery, especially for low-permeability reservoirs.

How are in-situ polymer gel plugging agents formed?

Due to the fact that in-situ polymer gel plugging agents were formed through the crosslinking reaction of polymers and crosslinking agents under reservoir conditions, the geological characteristics of the reservoirs had a significant impact on the formation of in-situ polymer gels.

What is a gel plugging agent?

Among them, the most commonly used gel plugging agent was polyacrylamide gel, mainly because partially hydrolyzed polyacrylamide (HPAM) could preferentially enter reservoirs with high water saturation and has excellent oil–water selectivity.

What are the different types of profile control agents?

Currently, common profile control agents included inorganic gels , , , in-situ gels , preformed gel particles , resin-based profile control agents, foam-based profile control agents , microbial profile control agents , emulsion-based profile control agents , and precipitation-based profile control agents .

Are inorganic gel diverting agents better than polymer gel plugging agents?

Inorganic gel diverting agents, compared to polymer gel plugging agents, exhibited higher temperature and salt resistance as well as greater stability, making them suitable for high-temperature and high-mineralization reservoir environments.