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:
Dec. 17, 1985
Filed:
Aug. 03, 1984
James A Burton, Houston, TX (US);
Hubert L Elkins, Houston, TX (US);
Milton E Goodhart, Houston, TX (US);
Hydril Company, Los Angeles, CA (US);
Abstract
A method and apparatus is disclosed for deviated hole drilling upwardly and outwardly from beneath a shallow hydrocarbon formation pay zone. A large diameter vertical hole is first formed as by drilling below the pay zone. A first casing having a directional window provided in its wall is cemented in the large diameter hole. One or more casings are then provided in the borehole below the first casing. A carriage assembly loaded with drilling tools for drilling upwardly and outwardly is then lowered by means of a working drill string and landed within the first casing. The carriage assembly has a first passage in fluid communication with the drill string. The drilling tools are loaded within a second passage of the carriage assembly. The top opening of the second passage is below the directional window when the carriage assembly is landed and angularly oriented in the first casing. A drill string extends from the drilling tools through the bottom of the carriage assembly and into the cased hole below the first casing. A stripper packer assembly at the lower end of the carriage assembly prevents the incoming high pressure mud from entering the second passage of the carriage assembly. The drilling tools comprise a mud pressure driven motor for turning a drilling bit. A weight-on-bit assembly provides force to the drilling bit against the face of the borehole being drilled. A bent sub causes the drilling to be deviated outwardly while drilling upwardly. Drilling power is provided via pressurized mud through the working drill string, the first passage, the annulus between the lower hole casing and the outside of the drilling string and then via the interior of the drill string.