Title:
DRILL STRING WITH A DOWNHOLE REAMER
Document Type and Number:
WIPO Patent Application WO/2020/079393
Kind Code:
A3
Abstract:
A drill string for use in the directional drilling of wellbores is described. A downhole reamer apparatus (202) is mounted in a drill string incorporating a drilling motor (300), stabiliser (302) and drill bit (304) operable either by rotation of the drill string or activation of the drilling motor (300). The drill string is located in wellbore (306) at the end of drill pipe (310). If the operator wishes to drill upwardly, the reamer elements are locked in the retracted condition. This results in the reamer apparatus being under gauge which results in build angle (308) pointing the drill bit upwardly.
Inventors:
LEE PAUL BERNARD (CA)
BEAZER DAYLN (CA)
BEAZER DAYLN (CA)
Application Number:
PCT/GB2019/052624
Publication Date:
May 28, 2020
Filing Date:
September 18, 2019
Export Citation:
Assignee:
LEE PAUL BERNARD (CA)
BYWORTH IAN JAMES (GB)
BYWORTH IAN JAMES (GB)
International Classes:
E21B10/32
Domestic Patent References:
| WO2001000961A1 | 2001-01-04 |
Foreign References:
| US1822216A | 1931-09-08 | |||
| US1663048A | 1928-03-20 | |||
| US1828750A | 1931-10-27 | |||
| US1794735A | 1931-03-03 | |||
| US1743528A | 1930-01-14 | |||
| GB302900A | 1930-02-06 | |||
| US20020062995A1 | 2002-05-30 | |||
| CN104806170A | 2015-07-29 | |||
| US20150144401A1 | 2015-05-28 |
Attorney, Agent or Firm:
BYWORTH, Ian James (GB)
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