Search
Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
16 results returnedSearch results
- Review of horizontal drilling technology for methane drainage from U.S. coalbeds
- Least squares calculation of horizontal stress from more than three diametral deformations in vertical boreholes
- 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
- Horizontal trajectories of rotary-drilled holes
- Cost comparison of gob hole and cross-measure borehole systems to control methane in gobs
- Evaluation of water-jet-assisted drilling with handheld drills