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Mining Publication: Directionally Controlled Drilling To Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, Pa.
Keywords: Degasification Drilling
Original creation date: January 1977
Authors: WP Diamond, DC Oyler, HH Fields
Report of Investigations - January 1977
Download PDF Document (0.99 MB)
NIOSHTIC2 Number: 10000664
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8231, 1977 Jan; :1-21
A 3-inch pilot hole was directionally drilled to intercept the Freeport coalbed horizon horizontally at Mather, Pennsylvania, as part of a Bureau of Mines degasification project. The original concept was to continue the horizontal drilling into the coalbed, after the initial intercept, with a total of three horizontal holes eventually being completed. However, the erratic thickness (0.0 to 4.3 feet) of the Freeport coalbed at Mather was not sufficient to support the horizontal drilling degasification technique, and the site was abandoned after six attempts to locate adequate continuous coal thickness. The drilling of coreholes in the immediate vicinity of proposed well paths to evaluate coal thickness is essential prior to future slant hole operations. Although mechanical failures of the new directional drilling equipment, mud pump and rig breakdowns, directional control problems, and exploratory horizontal drilling in the Freeport horizon more than doubled the anticipated cost of the pilot hole, continuing improvements in directional drilling equipment and techniques should significantly reduce the time and costs of future drilling operations.
Image of publication Directionally Controlled Drilling To Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, Pa.Report of Investigations - January 1977
Download PDF Document (0.99 MB)
NIOSHTIC2 Number: 10000664
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8231, 1977 Jan; :1-21
See Also
Cableless Electronic Surveying Systems for Horizontal Holes
Degasification and Production of Natural Gas From an Air Shaft in the Pittsburgh Coalbed
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Directional Drilling For Coalbed Degasification: Program Goals and Progress in 1978
Drainage of Methane From the Overlying Pocahontas No. 4 Coalbed From Workings in the Pocahontas No. 3 Coalbed
Drill Rig Incident
Drilling a Horizontal Coalbed Methane Drainage System from a Directional Surface Borehole
Noise Exposure and Overhead Power Line (OPL) Safety Hazards at Surface Drilling Sites
Rotary Drilling Holes in Coalbeds for Degasification
Rotary Drilling Techniques Used in the Beckley Coalbed
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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