Apparatus and method for circulating fluid in a borehole
US6152228A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1998 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | May 28, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus and method for circulating fluid in a borehole is described. The apparatus comprises a tubular assembly (1; 40; 60) which has an axial through passage (21, 18; 47; 19) between a fluid inlet (21) and first fluid outlet (19). The fluid inlet (21) and the first fluid outlet (19) are connected (13, 20) in a work string which is supported from the surface above the borehole. There is a second outlet (16; 42, 48) which extends generally transversely of the assembly (1; 40; 60). An obturating member (9) is moveable between a first position in which the second fluid outlet (16; 42, 48) is closed and a second position which permits fluid flow through the second outlet (16; 42, 48). An engagement mechanism (12, 6, 7; 68, 69) is moveable between an engaged configuration in which the obturating member (9) is maintained in one of the first and second positions, and a disengaged configuration in which the obturating member (9) is in the other of the first and second positions. The tubular assembly (1; 40; 60) is coupled to a shoulder which is engageable with the formation in the borehole to engage or disengage the engagement mechanism (12, 6, 7; 68, 69). Setting down weight on the w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.