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Title: Directional drilling system and method for drilling precise offset wellbores from a main wellbore

Abstract

This patent describes a directional drilling apparatus for deflecting a drill bit to drill an offset borehole from the central axial path of a main wellbore of vertical, horizontal, or slanted orientation. It comprises a tool body; inflatable packer means for sealing the main wellbore below the first passageway; means in the first passageway for activating the packer so that it will inflate; the tool body having a second passageway that forms an acute angle with the first passageway; and an entry portion having means for routing the drill bit into the second passageway. This patent also describes a method of drilling one or more offset wellbores from a first main wellbore. It comprises drilling the initial main wellbore; placing a first, larger drill string in the initial wellbore that has a tool body with first and second passageways therein; orienting the radial position of the second passageway with respect to the initial, main wellbore using a steering tool; placing a second, smaller drill string in the main wellbore and inside the first drill string; diverting the second drill string to the second passageway at a position upstream of first passageway; tracking the second passageway with the second drill stringmore » during drilling of an offset wellbore that forms an angle with the first borehole.« less

Inventors:
; ;
Publication Date:
OSTI Identifier:
7310560
Patent Number(s):
US 5115872; A
Application Number:
PPN: US 7-599756
Assignee:
Anglo Suisse, Inc., Houston, TX (United States)
Resource Type:
Patent
Resource Relation:
Patent File Date: 19 Oct 1990
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; DIRECTIONAL DRILLING; OIL WELLS; DRILL BITS; DRILLING; DRILLING EQUIPMENT; EQUIPMENT; WELLS; 020300* - Petroleum- Drilling & Production

Citation Formats

Brunet, C G, Labbee, G E, and McGee, J W. Directional drilling system and method for drilling precise offset wellbores from a main wellbore. United States: N. p., 1992. Web.
Brunet, C G, Labbee, G E, & McGee, J W. Directional drilling system and method for drilling precise offset wellbores from a main wellbore. United States.
Brunet, C G, Labbee, G E, and McGee, J W. 1992. "Directional drilling system and method for drilling precise offset wellbores from a main wellbore". United States.
@article{osti_7310560,
title = {Directional drilling system and method for drilling precise offset wellbores from a main wellbore},
author = {Brunet, C G and Labbee, G E and McGee, J W},
abstractNote = {This patent describes a directional drilling apparatus for deflecting a drill bit to drill an offset borehole from the central axial path of a main wellbore of vertical, horizontal, or slanted orientation. It comprises a tool body; inflatable packer means for sealing the main wellbore below the first passageway; means in the first passageway for activating the packer so that it will inflate; the tool body having a second passageway that forms an acute angle with the first passageway; and an entry portion having means for routing the drill bit into the second passageway. This patent also describes a method of drilling one or more offset wellbores from a first main wellbore. It comprises drilling the initial main wellbore; placing a first, larger drill string in the initial wellbore that has a tool body with first and second passageways therein; orienting the radial position of the second passageway with respect to the initial, main wellbore using a steering tool; placing a second, smaller drill string in the main wellbore and inside the first drill string; diverting the second drill string to the second passageway at a position upstream of first passageway; tracking the second passageway with the second drill string during drilling of an offset wellbore that forms an angle with the first borehole.},
doi = {},
url = {https://www.osti.gov/biblio/7310560}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 26 00:00:00 EDT 1992},
month = {Tue May 26 00:00:00 EDT 1992}
}