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Least squares calculation of horizontal stress from more than three diametral deformations in vertical boreholes

Review of horizontal drilling technology for methane drainage from U.S. coalbeds

Drilling a horizontal coalbed methane drainage system from a directional surface borehole

Probability of encountering coalbed discontinuities during vertical and horizontal borehole drilling

Site-specific and regional geologic considerations for coalbed gas drainage

Control of longwall gob gas with cross-measure boreholes (upper Kittanning coalbed)

Quartz dust sources during overburden drilling at surface coal mines

Comparison of rotary and in-hole motor techniques for drilling horizontal boreholes in coal

Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed)

Bit wear-flat temperature as a function of depth of cut and speed

Effects of stimulation treatments on coalbeds and surrounding strata :evidence from underground observations

Zeta potential control for simultaneous enhancement of penetration rates and bit life in rock drilling

Probe-hole drilling :high-stress detection in coal

Cost comparison of gob hole and cross-measure borehole systems to control methane in gobs

Evaluation of water-jet-assisted drilling with handheld drills

Horizontal trajectories of rotary-drilled holes


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