The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 1985
Filed:
Feb. 21, 1984
Ruel C Terry, Denver, CO (US);
In Situ Technology, Inc., Golden, CO (US);
Abstract
Production of methane from an underground wet coal seam is initiated by drilling a well from the surface of the earth through the seam. Rather than pumping water to lower hydraulic head on the seam to permit desorption of methane within the coal, high pressure gas is injected into the seam to drive water away from the wellbore. Gas injection is terminated and the well is opened to flow. Initial gas production is return of injected gas, followed by a mixture of return injected gas and methane, followed by free methane from the fracture system of the coal, and then by methane desorbed from the coal. Upon return of displaced water to the wellbore, pumping operations remove water at rates that permit sustained production of desorbed methane.