Dual Barrier Pump-Out Plug

摘要

Wellbore isolation is used for a tubing string in a well. A first plug is held by a first temporary retention in a bore of a housing disposed on the tubing string and is sealed in the bore with a first seal. A second plug is also held in the bore by a second temporary retention and is sealed in the bore with a second seal. The first and second seals seal a space in the bore between the plugs. Both plugs can be of a dissolvable material. An uphole end of the first plug facing away from the space can have a non-dissolvable coating, while a downhole end of the second plug facing away from the space can have a non-dissolvable coating. The first plug releases in the bore when an uphole pressure is applied in the tubing string, and the second plug then releases after the first plug.

主权项

1. A wellbore isolation device for a tubing string in a well, the device comprising:
a housing disposed on the tubing string and defining a bore therethrough; a first plug held in the bore by a first temporary retention and sealed in the bore with a first seal; and a second plug held in the bore at a space from the first plug by a second temporary retention and sealed in the bore with a second seal, the first and second seals sealing the space in the bore between the first and second plugs.