PHPA is a water-soluble polymer. Interactions between the polymer molecules increase the viscosity of the drilling mud proportionally to the molecular weight of the product. PHPA can be used in fresh water, sea water or NaCl and KCl systems. PHPA is not compatible with high divalent contents in the water and high temperature applications. However, sulfonated co-polymers improve temperature stability and rheological profile and can be made associative or with protective groups for applications where PHPA will not work
Polymer is adsorbed on the surfaces of drill cuttings and on the borehole wall. The encapsulation of drilled solids promotes flocculation and minimizes the disintegration and the dispersion of the suspended solids. These larger cuttings are then carried up to the surface where they can be more efficiently removed by solids control equipment. The adsorption of polymers onto the borehole wall also enhances the stability of water-sensitive formations such as shales to avoid caving and hole enlargement
Anionic polymers may act by the long chain with negative ions attaching to the positive sites on the clay particles, or to the hydrated clay surface through hydrogen bonding. Surface hydration is reduced as the polymer coats the surface of the clay. Low cationic polymers can also be used for shale inhibition. High cationic polymers can interact with other chemicals used in the drilling mud and lead to compatibility issues
High MW PHPA with KCl salt are used as anti-clay swelling agents
We offer a wide range of PHPA with different molecular weight and degree of ionization. We have different types of PHPA: Anionic, Cationic and Nonionic.