Polymer Drilling Fluid with Micron-Grade Cenosphere for Deep Coal Seam

Figure 10

Dynamic damage tester: (a) full view of tester; (b) core in gripper; (c) core displacement process; (d) internal rotation device; (e) joining drilling fluid and rotating (another drilling fluid); (f) sealing and inflating to simulate wellbore conditions.

(a)

(b)

(c)

(d)

(e)

(f)