Bypass valve for downhole motor

Details Bypass valve for downhole motor Bypass valve for downhole motor

1997-09-03

1999-02-23

Schoeppel, Roger

Wells

Valves, closures or changeable restrictors

Fluid operated

166141, 166147, 251 63, 277 27, F16J 1540

Patent

active

058734147

ABSTRACT:
A bypass valve, particularly useful for allowing a tubing string to fill or drain during tripping in and tripping out, is disclosed. The bypass valve can be used in conjunction with a downhole motor operated through a tubing string. The bypass valve features a movable tapered valve member which has a smaller taper than the valve seat to prevent dragging the sealing element across sharp edges as the valve closes. Ports are provided through the valve to conduct upstream pressure in the valve behind the sealing element so that upon contact of the sealing element on the valve member with the seat, a boost force is applied to help retain the seal.

REFERENCES:
patent: 2490511 (1949-12-01), Courtot
patent: 4103903 (1978-08-01), Cariotti et al.
patent: 4204689 (1980-05-01), Johansson
patent: 4256314 (1981-03-01), Berglund et al.
patent: 4258925 (1981-03-01), Guyton
patent: 4948925 (1990-08-01), Winters et al.
patent: 5253713 (1993-10-01), Gregg et al.
patent: 5295534 (1994-03-01), Porter

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