Study on Relation between Hydrodynamic Feature Size of HPAM and Pore Size of Reservoir Rock in Daqing Oilfield

Table 1

The ionic composition of experimental water (mg/L).

Water	Ion concentration, mg/L							Salinity, mg/L
Ions	K^+, Na^+	Ca^2+	Mg^2+	Cl^−
Clear water	73.93	39.32	17.22	54.79	31.41	236.61	15.51	468.79
Sewage	1700.14	45.87	7.95	812.65	20.94	2886.58	186.15	5660.29