Study on Fluid-Rock Interaction and Reuse of Flowback Fluid for Gel Fracturing in Desert Area

Table 5

Comparison of rock permeability damage due to different fracturing fluids.

Formulations	Rock sample	Porosity (%)	Permeability before damage (mD)	Permeability after damage (mD)	Damage ratio η (%)
Broken/degraded recycled guar	SH11#	9.63	0.0121	0.0087	28.10
	SH7#	9.10	0.0331	0.0231	30.21
Broken/degraded original guar	Or1#	5.17	0.7609	0.6860	9.85
	Or6#	8.66	1.0188	0.8188	19.63