With the continuous growth of global energy demand, the efficient development of petroleum resources has become a major focus in the industry. Oil extraction often faces technical challenges such as drilling fluid loss, wellbore collapse, formation sand production, and clay swelling, which significantly impact operational safety and recovery efficiency. In this context, polyamine-based cationic polymers are increasingly becoming key additives for enhancing oil extraction efficiency due to their excellent anti-swelling and flocculation properties.

I. Basic Properties and Classification of Polyamine

Polyamine is a type of high-molecular-weight cationic polymer primarily composed of quaternary ammonium groups. It exhibits strong charge density and good water solubility.

II. Anti-Swelling Performance: Effectively Controlling Wellbore Stability

1. Anti-Swelling Mechanism
   During drilling, formations often contain significant amounts of swelling clay minerals such as montmorillonite and illite. These minerals rapidly absorb water and expand upon contact, leading to wellbore instability or drilling fluid loss. The cationic groups in polyamine molecules electrically neutralize the negative charges on clay particle surfaces, forming an adsorption layer that:

   • Inhibits clay hydration and swelling;

   • Forms a stable coating layer, enhancing wellbore integrity;

   • Reduces drilling fluid filtration, maintaining stable mud performance.

2. Advantages of Polyamine Anti-Swelling Products

   • High charge density with strong adsorption;

   • High temperature and salt tolerance, suitable for deep wells and high-salinity environments;

   • Good compatibility with other anti-collapse agents such as silicones and amines, allowing flexible formulation.

III. Flocculation Performance: Efficient Solid-Liquid Separation for Mud Circulation

1. Flocculation Principle
   Processes such as drilling, fracturing, and water injection generate large amounts of oil-containing, solid-laden wastewater and mud. Polyamine promotes the rapid aggregation of fine suspended particles through charge neutralization and bridging, achieving efficient solid-liquid separation and improving the quality of reinjected water and the efficiency of sludge treatment.

2. Application in Oilfield Wastewater Treatment

   • Treatment of drilling waste mud: Rapid sedimentation and improved separation efficiency;

   • Purification of fracturing flowback fluids: Removal of various colloids and fine particles;

   • Pretreatment of produced water: Ensures stable operation of subsequent membrane treatment equipment.

IV. Conclusion

As a high-molecular-weight cationic polymer, polyamine demonstrates excellent dual performance in anti-swelling and flocculation, making it a crucial additive in the field of oilfield chemicals.

Leveraging years of experience in the research, development, and service of modified cationic polymer products, our company remains committed to providing customized polyamine products and application solutions to support safe, efficient, and sustainable oilfield development.

If you have any related product application needs or technical inquiries, please feel free to contact our professional team.