Effective Completions for Shallow Coal Seams. Topical Report, September 1994

摘要

This report provides design considerations and results for the completion of near-surface coal seams. Recent recompletions mostly utilize low-cost variations of designs implemented by GRI to exploit the high permeability of shallow seams. GRI research indicated that recompletions can be economic despite pressures and gas contents significantly lower than underlying seams. Typical low-end recompletion costs of $7,000 per well and incremental rates of 20 MCFD can achieve payout within six months for wells previously qualified for tax credits.