Tailored polymers for a wide range of field conditions

To ensure optimal injectivity and sweep efficiency, we focus on four key field conditions:

• reservoir temperature
• divalent ion concentration
• salinity of injection and formation fluids, and
• reservoir permeability.

Salinity and divalent ion concentration of injection and formation fluids along with reservoir temperatures affect the viscosity and stability of the solution. Harsher conditions typically require sulphonated polymers. Molecular weight selection is driven by reservoir permeability range.

Product	Molecular weight	Sulphonation	Temperature	Salinity
KemSweep A-5257	Low	None	Low – high *	Low
KemSweep A-5271	Medium	None	Low – high *	Low
KemSweep A-5265	High	None	Low – high *	Low
KemSweep A-5365	Very high	None	Low – high *	Low
KemSweep A-6000	Ultra high	None	Low – high *	Low
KemSweep A-5300 series	Low – high	Low – medium	Low	High
KemSweep A-5900 series	Low – high	Low – high	High	High
KemSweep A-5291	Medium	Very high	High	High

^{* Suitable for high-temperature reservoirs in the absence of divalent ions.}