Managed pressure drilling system having well control mode
US10329860B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2017 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Feb 7, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of drilling a subsea wellbore includes drilling the subsea wellbore and, while drilling the subsea wellbore: measuring a flow rate of the drilling fluid injected into a tubular string; measuring a flow rate of returns; comparing the returns flow rate to the drilling fluid flow rate to detect a kick by a formation being drilled; and exerting backpressure on the returns using a first variable choke valve. The method further includes, in response to detecting the kick: closing a blowout preventer of a subsea pressure control assembly (PCA) against the tubular string; and diverting the flow of returns from the PCA, through a choke line having a second variable choke valve, and through the first variable choke valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.