Partially Hydrolyzed Polyacrylamide /polyacrylate(PHPA)
It is a co-polymer of anionic character and high molecular weight. It is a water-soluble polymer, which is primarily used as a highly efficient fluid loss reducer, viscosifier and protective colloid for shale's and cutting in fresh water, calcium, sodium brines and KCL mud systems. It is compatible with most of the drilling fluid products, biopolymers, PAC, CMC. It maintains borehole stability by preventing shale swelling and erosion.
1) Appearance: White granule
2) Molecular weight: 5 - 22 million minimum
3) Granule: 20 - 100 mesh
4) Solid content: 88% minimum
5) Hydrolyzing degree: 10 - 20%, 20 - 30% or 30 - 40%
6) Dissolving time: 2 hours maximum (10º C)
7) Monomer free: 0.05% maximum
It maintains viscosity in solid free drilling fluid. As a bentonite extender in low solids non- dispersed
Mud, it can be used along with small addition of bentonite to suspend weight material.
It functions as an inhibitor by coating or encapsulating formation & cuttings.
It also restricts the interaction of water hydratable & dispersible shale's.
It can be used as a flocculent in clear water drilling.
It also provides inhibition properties to fresh water, sea water and also in presence of calcium ions.
High viscosity of this drilling fluid helps in better removal of cuttings from bore hole.
It is resistant to bacterial fermentation.
25kg/plastic enhanced paper bags with inner plastic bag, 25kg/PE bag