Characteristics of In Situ Stress and Reservoir Pressure in Deep Coal Seams and Their Influences on Reservoir Depletion: A Field Case Study

Figure 6

The differences in gas production effect for general borehole and slotted borehole. (a) Vertical stress distribution of general borehole. (b) Vertical stress distribution of the slotted wellbore. (c) The difference in gas flow rate with varied time. (d) The difference in gas flow rate with varied boreholes.

(a)

(b)

(c)

(d)