Coal gasification well drilling process

Wells – Processes – In situ combustion

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299 4, E21B 43243

Patent

active

048586897

ABSTRACT:
An in-situ coal gasification process for practice on a formation having one or more dipping coal seams that involves, directionally drilling a production wellbore into a burn module designated in each coal seam each from a separate surface location and, from one surface location, directionally drilling injection wellbores to a designated burn module in a coal seam. In practicing the process, a drilling platform is positioned to be proximate to a vertical line from a head or top end of each coal seam burn module for drilling, as nearly to the vertical as possible, a production wellbore into each coal seam entering the coal seam burn module above the head end, which drilling is then curved into that burn module to proceed longitudinally therein from end to end with pairs of injection wellbores drilled from a single surface location vertically through the coal seam that are then curved back into the burn module at a certain vertical depth, to be at angles to, and spaced a desired distance from the side of each production wellbore. Which injection wellbores are at angle to each production wellbore and are open, or are opened by perforating or slotting, to receive a burn material or enhancer therein. The gaseous products of each coal seam burn module burning to be drawn to the surface through each production wellbore.

REFERENCES:
patent: 4249775 (1981-02-01), Zakiewicz
patent: 4422505 (1983-12-01), Collins
patent: 4573531 (1986-03-01), Garkusha et al.
Rollins Module No. 2, Nov. 1981, DOE.

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