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:
Jun. 15, 2021
Filed:
Oct. 22, 2018
Managed Pressure Operations Pte. Ltd., Singapore, SG;
Christian Leuchtenberg, Singapore, SG;
MANAGED PRESSURE OPERATIONS PTE. LTD., Singapore, SG;
Abstract
A method of drilling a subterranean wellbore using a drill string includes injecting a drilling fluid into the subterranean well bore via the drill string and removing the drilling fluid from an annular space around the drill string (the annulus) via an annulus return line, oscillating a pressure of the drilling fluid in the annulus, determining a wellbore storage volume and a wellbore storage coefficient for each drilling fluid pressure oscillation, and using the wellbore storage volume and wellbore storage coefficient to determine a proportion by volume of gas and a proportion by volume of liquid in the annulus during that drilling fluid pressure oscillation. The wellbore storage volume is a change in a measured flow rate over a time period. The wellbore storage coefficient is the wellbore storage volume divided by a pressure change over the time period.