CHECK VALVE WITH INTERNAL MASS FOR PROGRESSIVE CAVITY PUMPS

Abstract

The present invention corresponds to a check valve with an inertial mass that is installed in the bottom of the production tubing and above the progressive cavity pump (PCP) of an oil well, which prevents that the hydrostatic column that is inside of the production tubing go down in the moment where the artificial lift of the column stops for the detention of the PCP pump. If we prevent that this phenomenon to happen, the PCP pump will not rotate in the opposite direction of its normal operation and it will not be clogged by any particulate material that is contained in it.

Claims

1. A check valve with an inertial mass for progressive cavity pump (PCP), characterized by having a piston 3 that overcomes the frictional force between the inner packing 17 and the stem 2 by mass, it makes a downward movement, and it makes a seal with niple 5 and closes the fluid passage between the stem 2 and the niple 5.

2. The check valve with an inertial mass for progressive cavity pump (PCP) of claim 1, characterized by having an upper nut 1, which presents the wedges 7 that serve to fit the grooves wedge 12 of the piston 3, once its unseated of the niple 5 and the well is in production.

3. The check valve with an inertial mass for progressive cavity pump (PCP) of claim 1, that is characterized by comprising a piston 3 that has a inter geometry with an inner diameter D1 that is lower than the diameter D2, which suspends the seizing of the piston 3 in the stem 2 by buckling of the stem 2.

4. The check valve with an inertial mass for progressive cavity pump (PCP) of claim 1, characterized by having a piston 3 that has an outer packing 18 which is adjusted by the piston cover 4.

Description

DESCRIPTION OF THE FIGURES

[0016] FIG. 1: View of the check valve with an inertial mass for progressive cavity pumps assembled with their respective parts.

[0017] FIG. 2: Top nut 1 view.

[0018] FIG. 3: Stem 2 view.

[0019] FIG. 4: Piston 3 view.

[0020] FIG. 5: Top piston 4 view.

[0021] FIG. 6: Niple 5 view.

[0022] FIG. 7: Lower locknut 6 view.

[0023] FIG. 8: Perspective view of the check valve with an inertial mass for progressive cavity pumps that is in an open position with the piston 3 embedded in the wedges 7 of the upper nut 1.

[0024] FIG. 9: Perspective view of the check valve with an inertial mass for progressive cavity pumps, in a closed position where the piston 3 is seated on the conical seat 16 o the niple 5.

LIST OF REFERENCE

[0025] 1. Top Locknut

[0026] 2. Stem

[0027] 3. Piston

[0028] 4. Cover piston

[0029] 5. Niple

[0030] 6. Lower Locknut

[0031] 7. Chocks

[0032] 8. Upper thread

[0033] 9. Upper left thread

[0034] 10. Lower left thread

[0035] 11. Lower thread

[0036] 12. Groove wedges

[0037] 13. Inside groove

[0038] 14. Step

[0039] 15. Thread

[0040] 16. Conical Seat

[0041] 17. Internal packing

[0042] 18. External packing