Preparation and Evaluation of a Profile Control Agent Base on Waste Drilling Fluid

Table 2

TDS and chemical composition of the formation water and the recirculated water.

Items	Na^++K^+	Ca^2+	Mg^2+		Cl^−		TDS
Content of the recirculated water (mg/L)	2093.3	73.8	41.2	94.5	3224.5	417.6	5944.9
Content of the formation water (mg/L)	3071.6	131.1	53.6	124.9	4580.7	573.2	8535.1