A High Effective Acid System to Stimulate Sandstone Reservoirs

Table 2

The mineral content comparison of A1 core before/after acid flooding.

Core plug A	Mineral types and contents								Clay, %
	Quartz, %	Potassic feldspar, %	Feldspar, %	Limestone, %	Ankerite, %	Pyrite, %	Siderite, %	Micas, %
Before acid flooding	5.2	3.3	5.2	17.1	5.4	2.7	1.6	5.3	54.2
After acid flooding	2.3	0	0	6.2	20.4	6.3	0	0	64.9