Experimental Study on the Damage of Artificial Fracture Permeability in Coal during the Flow Back of Guar-Based Fracturing Fluid

Figure 2

Unconventional natural gas reservoir damage evaluation equipment. (a) Constant-flux pump. (b) Intermediate container. (c) Electronic balance. (d) Confining pressure control device. (e) The core holder.

(a)

(b)

(c)

(d)

(e)