Title:
SYSTEM AND METHOD FOR FORMING A LATERAL WELLBORE
Document Type and Number:
WIPO Patent Application WO/2013/155059
Kind Code:
A3
Abstract:
A lateral wellbore (58) is formed from a high side ("H") of a horizontal portion of a primary wellbore (34) with a drill bit assembly (10) that has a selectively extendable pilot bit (22). The drill bit assembly (10) is mounted on a lower end of a drill string (36). A bit guide (38) is disposed adjacent the drill bit assembly (10) for urging the drill bit assembly ( 10) in a lateral direction against the high side ("H") of the primary wellbore (34). Rotating the drill bit assembly (10) while urging the drill bit assembly (10) upward creates a groove (50) in a subterranean formation ("F") adjacent the primary wellbore (34). This forms a ledge (52) at a far end of the groove (50). The drill string (36) is then drawn back from the groove (50), and the pilot bit (22) is deployed. Urging the drill bit assembly (10) forward engages the pilot bit (22) with the ledge (52), providing leverage for retaining the drill bit assembly (10) in an orientation for excavating the lateral wellbore (58).
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Inventors:
ZHOU SHAOHUA (SA)
Application Number:
PCT/US2013/035754
Publication Date:
July 17, 2014
Filing Date:
April 09, 2013
Export Citation:
Assignee:
SAUDI ARABIAN OIL CO (SA)
ARAMCO SERVICES CO (US)
ARAMCO SERVICES CO (US)
International Classes:
E21B10/26; E21B7/06
Foreign References:
| US5009273A | 1991-04-23 | |||
| US2227233A | 1940-12-31 | |||
| US5094304A | 1992-03-10 | |||
| US4938298A | 1990-07-03 |
Attorney, Agent or Firm:
RHEBERGEN, Constance, Gall (P.O. Box 61389Houston, TX, US)
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