Method of dynamically controlling open hole pressure in a wellbore using wellhead pressure control
US7407019B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2005 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Dec 17, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of dynamically controlling open hole pressure within a wellbore having a drill string positioned therein. The method comprising the steps of pumping a fluid down the drill string, into an annulus formed by the drill string and the interior of the wellbore, and then subsequently up the annulus to the surface of the ground; selectively applying wellhead pressure to the annulus through selectively pumping an additional quantity of the fluid or a quantity of a secondary fluid across the annulus; and, controlling the application of wellhead pressure applied to the annulus by controlling one, or both, of (a) the operation of a wellhead pressure control choke, and (b) the flow rate of the additional quantity of fluid or the secondary fluid pumped across the annulus, to thereby maintain open hole pressure within a desired range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.