Multilateral bore junction isolation

摘要

A junction can be isolated from fracturing pressure using a liner extending from a one bore through a junction into a lateral bore, where at least a portion of the liner is retrievable from the lateral bore prior to completion of wellbore construction. The junction may be temporarily isolated from high pressure, such as high pressure from a fracturing stimulation process. Part of the liner can be retrieved using a disconnect mechanism or technique.

主权项

1. A liner assembly, comprising:
a liner body partially configure to be positioned at a junction between a bore and a lateral bore of a well system through a subterranean formation; an isolation mechanism exterior to a portion of the liner body that is configured to be positioned closer to a surface of the well system than the junction to cooperate with the liner body in isolating the junction from fracturing pressure for the lateral bore; and a disconnect mechanism in a part of the liner body that is configured to be positioned in the lateral bore, wherein the disconnect mechanism comprises a shearable mechanism adapted for coupling the liner body to a safety sub-assembly in the lateral bore and for allowing the portion of the liner body to detach from the safety sub-assembly in response to a mechanical force.