US 9,816,350 B2 · Delayed opening pressure actuated ported sub for subterranean use

Abstract

A ported sub is operated with a pressure actuated shifting sleeve. A first rupture disc is set at a lower pressure than the test pressure for the tubing string that houses the ported sub. The first rupture disc breaks at a lower pressure than the string test pressure to expose well fluids to a disintegrating plug. The plug slowly disintegrates to then expose tubing pressure to a chamber and a second rupture disc with the chamber configured to have no effect on moving the sliding sleeve. When the tubing pressure is then raised to a predetermined pressure below the test pressure for the string, the second disc breaks exposing a piston to tubing pressure on one side and trapped low pressure being the opposite side of the string. The differential moves the sleeve to open a port to let tools be pumped into position without a need to perforate.

Claims24

Dependent claims

A circulation sub assembly for a tubular string, comprising:

a housing having a passage therethrough and at least one wall opening selectively covered by a pressure responsive movable member;
said member further comprising an actuation system that is selectively isolated, from housing pressure that would move said member, for a predetermined time to conduct a tubular string pressure test with housing pressure from said pressure test removing an initial barrier of the actuation system followed by a lowering of pressure at the conclusion of the tubing string pressure test;
whereupon, after a delay and lowering of pressure said actuation system is exposed to tubing pressure with a selective removal of a secondary barrier of the actuation system in a manner to move said member to open said at least one wall opening.

A circulation sub assembly for a tubular string, comprising:

a housing having a passage therethrough and at least one wall opening selectively covered by a pressure responsive movable member;
said member further comprising an actuation system that is selectively isolated, from housing pressure that would move said member, for a predetermined time to conduct a tubular string pressure test followed by a lowering of pressure at the conclusion of the tubing string pressure test;
whereupon, after a delay and lowering of pressure said actuation system is exposed to tubing pressure in a manner to move said member to open said at least one wall opening;
said actuation system comprises at least one disintegrating or otherwise failing plug;
said plug is initially isolated from fluid in said housing;
said plug is exposed to fluid in said housing as a result of an initial pressure increase toward a test pressure for the tubing string;
said initial pressure increase breaks a first rupture disc to allow fluids in said housing to reach said plug;
breaking of said first rupture disc does not apply a sufficient force to move said member;
disintegration or otherwise failing of said plug exposes a second rupture disc to pressure in said housing without applying a sufficient force to move said member.

6 more elements

Dependencies are inferred from the claim text.

Delayed opening pressure actuated ported sub for subterranean use

Life of this patent

Delayed opening pressure actuated ported sub for subterranean use

Life of this patent

Abstract

Claims24