Water-sensitive damage mechanism and the injection water source optimization of low permeability sandy conglomerate reservoirs

WANG Lei,ZHANG Hui,PENG Xiaodong,WANG Panrong,ZHAO Nan,CHU Shasha,WANG Xinguang,KONG Linghui

Table 2 Parameters of injected water.

Type of injection water Ion content of formation water/(mg·L-1) Total salinity of formation water/ (mg·L-1) Viscosity of injection water/ (mPa·s) Na+ K+ Ca2+ Mg2+ Cl- Distilled water 0 0 0 0 0 0 0.55 Water with 1/2 times salinity of the formation water 3 210 0 250 117 5 674 9 250 0.63 Formation water 6 420 0 500 233 11 348 18 500 0.70 Water with 2 times the salinity of the formation water 12 839 0 999 466 22 696 37 000 0.75 Water with 3 times the salinity of the formation water 19 259 0 1 499 699 34 044 55 500 0.80 Formation water+KCl 6 420 10 454 500 233 21 216 38 886 0.76 Formation water+KCl+MgCl2 6 420 7 087 500 1 014 21 799 36 838 0.76