Method and apparatus for maintaining bottom hole pressure during connections
US11629563B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 2017 |
| Grant date | Apr 18, 2023 |
| Priority date | — |
| Expiry date | Jun 15, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system for use in the drilling of oil or gas wells in conjunction with a mud injection device, said mud injection device adapted to maintain fluid pressure control within the borehole of a well bore when operating a drillstring therethrough, the system comprising: a gas reservoir containing gas; adapted for injection to control borehole pressure; compression system fluidly connected to the gas reservoir and the borehole; a pressure regulation system operatively connected to the gas reservoir and the borehole and adapted to measure the pressure within the annulus and relay such to a computer; wherein, when a drilling operation is halted to add a new stand to the drillstring and the mud injection device is stopped, the gas is injected to maintain the borehole pressure within the annulus of the borehole at a near constant value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.