Use of downhole isolation valve to sense annulus pressure
AssigneeWeatherford/Lamb, Inc.
InventorsJoe NOSKE, Gary L. MUELLER
Life of this patent
Estimating the term…
Abstract
A method of drilling a wellbore includes deploying a drill string into the wellbore through a casing string disposed in the wellbore. The casing string has a pressure responsive element and a hydraulic line in communication with the element and extending along the casing string. The method further includes: drilling the wellbore into a formation by injecting drilling fluid through the drill string and rotating a drill bit of the drill sting; and while drilling the formation, monitoring a pressure of the hydraulic line to ensure control of the formation.
Claims24
A method of drilling a wellbore, comprising:
- deploying a drill string into the wellbore through a casing string disposed in the wellbore, the casing string having a pressure responsive element and a hydraulic line in communication with the element and extending along the casing string;
- drilling the wellbore into a formation by injecting drilling fluid through the drill string and rotating a drill bit of the drill sting;
- and
- while drilling the formation, monitoring a pressure of the hydraulic line to ensure control of the formation.
A system for use in drilling a wellbore, comprising:
- an isolation valve, comprising:
- a tubular housing for assembly as part of a casing string and for receiving a drill string;
- a flapper disposed in the housing and pivotable relative thereto between an open position and a closed position;
- a flow tube longitudinally movable relative to the housing for opening the flapper;
- a hydraulic chamber formed between the flow tube and the housing and receiving a piston of the flow tube;
- and
- a hydraulic passage in fluid communication with the chamber and a hydraulic coupling;
- and
- a control line for connecting the hydraulic coupling to a hydraulic manifold;
- and
- a control station for operating the manifold and monitoring the control line and comprising a microcontroller (MCU) operable to calculate an annulus pressure using a pressure of the control line.
A method of monitoring a wellbore operation, comprising:
- deploying a tubular string into a wellbore through a casing string disposed in the wellbore, the casing string having a pressure responsive element and a hydraulic line in communication with the element and extending along the casing string;
- and
- while deploying the tubular string, monitoring a pressure of the hydraulic line to ensure control of a formation exposed to the wellbore.
Dependencies are inferred from the claim text.