Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effects of Stimulation Treatments on Coalbeds and Surrounding Strata: Evidence from Underground Observations
Stimulated vertical boreholes are an effective means of removing gas from coalbeds in advance of mining. The Bureau of Mines report examines the coal mine roof damage potential of stimulation treatments. Twenty-two Government-sponsored stimulation treatments have been mined through to determine the effects on the coalbed and roof strata. Vertical fractures in the coalbed were discernible for most treatments, and horizontal fractures were present for about half of the stimulations. Sand-propped vertical fractures were usually short in lateral extent. Evidence of stimulation fluid movement could generally be traced beyond the maximum extent of sand-filled fractures when fluorescent paint was added to the treatment fluids. The maximum lateral extent for a sand-filled vertical fracture was 416 ft, and a paint-coated vertical fracture extended 630 ft. No roof falls or adverse mining conditions were encountered that could be attributed to the stimulations.
Effects of Stimulation Treatments on Coalbeds and Surrounding Strata: Evidence from Underground Observations
Stimulated vertical boreholes are an effective means of removing gas from coalbeds in advance of mining. The Bureau of Mines report examines the coal mine roof damage potential of stimulation treatments. Twenty-two Government-sponsored stimulation treatments have been mined through to determine the effects on the coalbed and roof strata. Vertical fractures in the coalbed were discernible for most treatments, and horizontal fractures were present for about half of the stimulations. Sand-propped vertical fractures were usually short in lateral extent. Evidence of stimulation fluid movement could generally be traced beyond the maximum extent of sand-filled fractures when fluorescent paint was added to the treatment fluids. The maximum lateral extent for a sand-filled vertical fracture was 416 ft, and a paint-coated vertical fracture extended 630 ft. No roof falls or adverse mining conditions were encountered that could be attributed to the stimulations.
Effects of Stimulation Treatments on Coalbeds and Surrounding Strata: Evidence from Underground Observations
W. P. Diamond (Autor:in) / D. C. Oyler (Autor:in)
1987
55 pages
Report
Keine Angabe
Englisch
Hydraulic stimulation increases degasification rate of coalbeds
| TIBKAT | 1975
Surface observations and strata movement underground
| Engineering Index Backfile | 1957