The viscosity range of partially hydrolyzed polyacrylamide (PHPA) used in oil drilling and fracturing fluids can vary depending on specific needs and applications. Generally speaking, the viscosity range of PHPA is usually between 5 and 30 millipascal seconds (mPa·s).

The choice of viscosity depends on several factors, including formation conditions, well depth, plugging effectiveness, liquid carryover materials, and operational requirements. Lower viscosity PHPA can be used in formations with better permeability and shallower well depths, while higher viscosity PHPA is suitable for formations with poorer permeability and deeper wells.

It should be noted that the choice of viscosity should be determined based on the recommendations and standards of the driller, oilfield operator or related industry. In addition, operators need to conduct laboratory tests and field trials based on actual conditions to determine the optimal PHPA viscosity range in order to obtain the best fracturing effect. ⛏️