Title:
METHOD AND APPARATUS FOR SEVERING A DRILL STRING
Document Type and Number:
WIPO Patent Application WO/2015/159094
Kind Code:
A3
Abstract:
A method of severing a drill-string comprises reducing the load bearing cross-sectional area of the neck of a connection. The reduction in the area of the neck may be achieved using a precisely located flow-actuated cutter. The cutter may be pumped into the string to land on a seat above the connection. A bypass valve may be provided below the connection to facilitate fluid circulation.
More Like This:
| WO/2019/042699 | MILLING TOOL |
| WO/2005/106193 | TEMPERATURE LIMITED HEATERS USED TO HEAT SUBSURFACE FORMATIONS |
| JP2013047606 | UNDERGROUND HEAT EXCHANGER |
Inventors:
CHURCHILL ANDREW PHILIP (GB)
Application Number:
PCT/GB2015/051160
Publication Date:
January 14, 2016
Filing Date:
April 17, 2015
Export Citation:
Assignee:
CHURCHILL DRILLING TOOLS LIMTED (GB)
International Classes:
E21B29/00; E21B37/00; E21B43/114
Domestic Patent References:
| WO2002032634A2 | 2002-04-25 |
Foreign References:
| US4278127A | 1981-07-14 | |||
| US20100218952A1 | 2010-09-02 | |||
| US20110061864A1 | 2011-03-17 | |||
| US20110284224A1 | 2011-11-24 | |||
| US20120018158A1 | 2012-01-26 | |||
| US3254720A | 1966-06-07 | |||
| US20130192830A1 | 2013-08-01 |
Attorney, Agent or Firm:
SHANKS, Andrew (Aurora120 Bothwell Street, Glasgow Strathclyde G2 7JS, GB)
Download PDF: