DECENTRALIZING, CENTRALIZING, LOCATING AND ORIENTING SUBSYSTEMS AND METHODS FOR SUBTERRANEAN MULTILATERAL WELL DRILLING AND COMPLETION

摘要

A guide bushing for use proximate a junction between a main well flow conductor and a lateral wellbore, said guide bushing comprising a tubular member having a predetermined inner diameter less than that of said main well flow conductor and an outer diameter sufficient substantially to centralize said guide bushing within said main well flow conductor. The tubular member having a bushing window defined in a sidewall thereof, said bushing window having a defined height thereof, said guide bushing locatable proximate said junction, said bushing window registerable with a main well flow conductor window, said guide bushing centralizing a tool having a diameter less than said predetermined inner diameter with respect to said main well flow conductor, said bushing window protecting a periphery of said main well flow conductor window from contact with said tool; and an anchoring structure coupled to said tubular member for fixing said tubular member at a predetermined location and orientation within said main well flow conductor.