E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/00 (2006.01)
Patent
CA 2663534
Retractable ball seats (20) having a housing (12), a seat, and a plug such as a ball (30) are disclosed. The seat has a retracted position that prohibits the ball from passing through the passageway (25) and an expanded position that permits the ball to pass through the passageway. A time delay material, such as a dissolvable material (40), maintains the seat in the retracted position. The time delay material disintegrates, degrades, or dissolves withi a known period of time such that the retractable ball seat can be placed in a desired location in the wellbore and the ball will be released through the passageway within a known period of time.
L'invention concerne des sièges de bille rétractables comportant un boîtier, un siège et un bouchon, notamment une bille. Le siège de l'invention présente une position rétractée empêchant la bille de passer par le passage et une position étendue permettant à la bille de traverser le passage. Une matière retardatrice, notamment une matière soluble, maintient le siège en position rétractée. La matière retardatrice se désintègre, se dégrade, ou se dissout dans un délai connu, de sorte que le siège de bille rétractable peut être placé dans un emplacement voulu du puits de forage et que la bille peut-être libérée par le passage dans un délai connu.
Baker Hughes Incorporated
Sim & Mcburney
LandOfFree
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