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:
Nov. 09, 2021
Filed:
Sep. 04, 2019
Saudi Arabian Oil Company, Dhahran, SA;
SAUDI ARABIAN OIL COMPANY, Dhahran, SA;
Abstract
A drilling system for forming a wellbore includes a drill string, a drill bit, and a circulation sub in the drill string. Manipulating the circulation sub forms a passage through a sidewall of the drill string; which diverts some of the drilling fluid flowing inside the drill string into the wellbore. Diverting some of the drilling fluid through the passage reduces the amount of drilling fluid flowing in the wellbore between the drill bit and circulation sub, and which optimizes equivalent circulating density of the drilling fluid. Included in an embodiment of the circulation sub is a cylinder that is indexed into set positions by engagement with a J-slot profile in a housing of the circulation sub. A sleeve in the sub is responsive to cylinder positions, and has a port that registers with a slot in the sub walls to form the passage.