System for controlling wellbore pressure during pump shutdowns
US11149506B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2015 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | Mar 31, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system and method for maintaining fluid pressure within a well bore includes: (a) an axially reciprocable choke; (b) a mud pump; (c) a programmable controller in communication with the choke and providing operational control of the axial reciprocation of the choke to maintain a set point choke pressure; (d) the controller configured to associate a drilling set point choke pressure within the well bore with a drilling pump rate and associate a predetermined connection set point choke pressure within the well bore with a pump rate; and (e) a mud pump monitor configured to communicate with the mud pump and the programmable controller, measure the pump rate of the pump, and communicate the measured pump rate to the programmable controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.