Mud check valves in drilling apparatus (wells)

Details Mud check valves in drilling apparatus (wells) Mud check valves in drilling apparatus (wells)

E - Fixed Constructions

21

B

E21B 21/10 (2006.01) E21B 3/02 (2006.01) E21B 34/06 (2006.01) F16K 17/196 (2006.01)

Patent

CA 2124676

A check valve for connection with the top end of a drillstring as a mud saver comprises a tubular valve member (18) which is axially shiftable within a tubular body (10) through a sleeve seal (19) which is mounted in the body (10) and which cooperates with ports in the wall of the tubular valve member (18) and which is disposed adjacent a downstream end of the tubular valve member. A compression spring (20) urges the tubular valve member (18) in the upstream direction into abutment with an upstream stop (15). The downstream end of the tubular valve member is closed by means of a frangible glass disc (21). The sleeve seal (19) is also axially shiftable in the body (10) in an upstream direction away from a downstream stop (17) and the compression spring (20) urges the sleeve seal (19) in the downstream direction. In a compact arrangement, the tubular valve member (18) is housed within an upstream hollow pin (30) of a saver sub particularly suited to a top drive arrangement.

Clapet de retenue de la boue destiné à être monté sur l'extrémité supérieure d'un train de tiges comprenant un corps de clapet tubulaire (18) capable de se déplacer axialement à l'intérieur d'une cage tubulaire (10) à travers un joint de manchon (19) situé dans la cage (10). Le joint de manchon coopère avec des ouvertures pratiques dans la paroi du corps du clapet tubulaire (18) et est adjacente à une extrémité en aval du corps de clapet tubulaire. Un ressort à compression (20) sollicite le corps de vanne tubulaire (18) dans le sens aval vers une butée située en amont (15). L'extrémité avale du corps de clapet tubulaire est fermée à l'aide d'un opercule en verre frangible (21). Le joint de manchon (19) est capable également de se déplacer axialement dans la cage (10) dans le sens amont afin de s'éloigner d'un butée en aval (17) et le ressort de compression (20) sollicite le joint de machon (19) dans le sens aval. Selon un aménagement compact, le corps de clapet tubulaire (18) est logé à l'intérieur de la broche creuse (30) en aval (30) d'un raccord d'usure adapté notamment à un système d'entraînement par le sommet.

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