Apparatus and method for temporarily plugging a tubular

Details Apparatus and method for temporarily plugging a tubular Apparatus and method for temporarily plugging a tubular

1995-06-29

1996-04-30

Tsay, Frank S.

Wells

Processes

Cementing, plugging or consolidating

166185, 166191, 166317, F21B 3313, F21B 33134

Patent

active

055116175

ABSTRACT:
An apparatus and method for controlling the pressure at which a fluid is introduced into a well penetrating a subterranean formation. The apparatus comprises a blow out sub having a sealed chamber between two plugs. The chamber is filled with a fluid at a known pressure. Thus, the pressure required to release the first plug is independent of the pressure in the well below the sub. The sub is attached to a tubular and positioned within the well. The first plug is then released upon application of a predetermined pressure fluid pressure, and the second plug is released upon application of a lesser pressure. The blow out sub may additionally comprise a tube forming a channel through the first plug, the chamber, and the second plug, with a means for controlling fluid flow through the channel. A first fluid may be introduced into the well via the channel prior to releasing the first plug.

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