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. 22, 1998
Filed:
Apr. 19, 1996
Philip Burge, Chiswick, London W4 2NU, GB;
Peter Fontana, Drayton Gardens, London SW10, GB;
Glenn Leroux, Roehampton, London, SW15, GB;
Friedhelm Makhol, 20320 Hermannsburg, DE;
Other;
Abstract
The present invention provides a drilling rig which includes an electrically-controllable tubing injection system. The injection system contains a fixed injector head with two movable injection blocks which are remotely operable to provide a desired opening therebetween. Each injection block contains a plurality of gripping members for holding a range of tubing sizes. The injection blocks automatically adjust to provide the required gripping force and tubing speed according to programmed instructions. A resilient tubing guidance system is positioned above the injector head directs the tubing into the injector head. The rig system contains sensors for determining the radial force on the tubing exerted by the injector head, tubing speed, injector head speed, weight-on-bit during the drilling operations, bulk weight of the drill string, compression of the tubing guidance memeber during operations and the back tension on the tubing reel. During operations, a control unit continually maintains the tubing speed, tension on chains in the injector head, radial pressure on the tubing within predetermined limits. Additionally, the control unit maintains the back tension on the reel and the position of the tubing guidance system within their respective predetermined limits. The control unit also controls the operation of the wellhead equipment. During removal of the tubing from the wellbore, the control unit operates the reel and the injector head to remove the tubing from the wellbore.