Formation Damage due to Drilling and Fracturing Fluids and Its Solution for Tight Naturally Fractured Sandstone Reservoirs

Table 1

Information about core samples used in this study.

Sample name	Length (cm)	Diameter (cm)	Matrix permeability (mD)	Fracture width (μm)	Fluid damage or treatment tests
#1	4.70	2.47	0.0077	10	Fracturing fluid
#2	4.53	2.47	0.0047	57	Fracturing fluid
#3	3.92	2.46	0.0027	89	Fracturing fluid
#4	37.5	2.46	0.0027	112	Fracturing fluid
#5	56.8	2.48	0.0056	123	Fracturing fluid
#6	51.9	2.45	0.0087	139	Fracturing fluid
#7	3.75	2.46	0.0027	20	Drilling fluid + fracturing fluid
#8	4.45	2.44	0.0137	53	Drilling fluid + fracturing fluid
#9	4.34	2.44	0.0137	76	Drilling fluid + fracturing fluid
#10	4.27	2.46	0.0012	98	Drilling fluid + fracturing fluid
#11	4.27	2.46	0.0012	116	Drilling fluid + fracturing fluid
#12	4.38	2.45	0.0910	127	Drilling fluid + fracturing fluid
#13	4.30	2.45	0.0910	139	Drilling fluid + fracturing fluid
#14	4.17	2.45	0.0140	42	Acid treatment
#15	4.27	2.44	0.0010	68	Acid treatment
#16	4.18	2.47	0.0019	91	Acid treatment
#17	4.15	2.47	0.0019	103	Acid treatment
#18	4.36	2.44	0.0010	117	Acid treatment
#19	4.40	2.44	0.0010	127	Acid treatment
#20	4.52	2.45	0.0015	139	Acid treatment
#21	4.07	2.44	0.0045	17	Drilling fluid + acid treatment
#22	4.49	2.44	0.0010	53	Drilling fluid+ acid treatment
#23	4.49	2.45	0.0015	75	Drilling fluid+ acid treatment
#24	4.09	2.45	0.0140	97	Drilling fluid+ acid treatment
#25	4.58	2.45	0.0038	115	Drilling fluid + acid treatment
#26	4.55	2.45	0.0009	127	Drilling fluid+ acid treatment
#27	4.59	2.45	0.0002	140	Drilling fluid+ acid treatment