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:
Mar. 24, 1987
Filed:
Apr. 01, 1986
Walter L Richards, Huntington Beach, CA (US);
Methane Drainage Ventures, Placentia, CA (US);
Abstract
A process provides for the recovering of methane gas from subterranean coalseams having sloughing, or caving, characteristics. A borehole is drilled in a generally horizontal direction into a subterranean coalseam and as the drilling progresses, a flushable borehole cake is formed on and in the walls of the horizontal borehole. The borehole cake prevents contemporaneously sloughing, or caving, of the boreholes during the drilling operation. A perforated liner may be inserted into the horizontal borehole and the borehole cake is then flushed out in order to allow methane gas present in the coalseam to enter the liner from which it is collected.