Casing floatation system with latch-in-plugs
AssigneeWeatherford Technology Holdings, LLC
InventorsMarcel Budde, Forrest Parker, Douglas Brian Farley
Life of this patent
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Abstract
A casing floatation system includes a casing having a pre-load collar and a landing collar; and a lower bottom latch-in plug comprising: a catch mechanism compatible with the pre-load collar; and a landing mechanism compatible with the landing collar. A method of well completion includes floating a casing in a wellbore with a casing floatation system having a pre-load collar; sequentially engaging a lower bottom latch-in plug and a top latch-in plug having a transitionable seal; pressure testing the casing; and triggering the transitionable seal to unseal the bore of the top latch-in plug.
Claims19
A casing floatation system comprising:
- a casing having a pre-load collar and a landing collar;
- a lower bottom latch-in plug comprising:
- a first pressure seal, wherein the first pressure seal releases at a first pressure;
- a catch mechanism compatible with the pre-load collar, wherein the catch mechanism releases at a second pressure;
- and
- a landing mechanism compatible with the landing collar;
- an upper bottom latch-in plug comprising a second pressure seal, wherein the second seal releases at a third pressure;
- and
- a top latch-in plug having a transitionable seal that is triggerable by a pressure signal at a fourth pressure;
- wherein:
- the first pressure is less than the second pressure, which is less than the third pressure;
- and
- the third pressure is less than the fourth pressure.
A casing floatation system, comprising:
- a first plug;
- and
- a second plug configured to engage the first plug, comprising:
- a tubular housing having a bore;
- a transitionable seal releasably fastened to the tubular housing in a first position, wherein the transitionable seal is configured to unfasten from the tubular housing in response to a first pressure of a fluid and move to a second position, wherein the bore is sealed when the transitionable seal is in the first and the second position;
- and
- a biasing member configured to move the transitionable seal to a third position after a second pressure of the fluid, wherein the second pressure is less than the first pressure, wherein the bore is unsealed when the transitionable seal is in the third position.
A casing floatation system, comprising:
- a first plug;
- and
- a second plug configured to engage with the first plug, comprising:
- a tubular housing having a bore;
- and
- a transitionable seal releasably fastened to the tubular housing in a first position, wherein the transitionable seal is configured to unfasten from the tubular housing in response to a pressure increase of a fluid and move to a second position, wherein the transitionable seal is configured to move from the second position to a third position in response to a pressure decrease of the fluid;
- wherein:
- the bore is sealed when the transitionable seal is in the first and the second position, and
- the bore is unsealed when the transitionable seal is in the third position.
A casing floatation system, comprising:
- a first plug having an uphole end;
- and
- a second plug configured to directly engage with the uphole end of the first plug, comprising:
- a transitionable seal moveable from a first position to a second position and then moveable from the second position to a third position;
- and
- a tubular housing having a bore, wherein:
- the bore is sealed by the transitionable seal when the transitionable seal is in the first position and the second position;
- and
- the bore is unsealed when the transitionable seal is in the third position.
Dependencies are inferred from the claim text.