Study of mixed water compatibility in Shanbei oil production

The properties of mixed water water from a certain river (RW) and Chang-6 layer output water(C-6W) -- in Shanbei Oil Production is studied in this paper, including ion content, analysis of scale, scale type and calcium loss rate, etc. It shows that the salinity of C-6W is more than 80000 mg/L, while RW's salinity is about 1200 mg/L; Under 30 C, the calcium loss rate and amount of scale buildup of C-6W and RW when their volume ratio were 4:6 reached to 9.5% and 36mg/L; while reservoir calcium the loss rate and scale buildup amount reached to 0.59% and 21.5 mg/L when the volume ratio of C-6W and Mixed Water came to 3:7, which satisfies the reinjection water quality standard; and a low core damage rate(<20%) could be found when the reinjection volume is 1 15 PV.