Wells – Valves – closures or changeable restrictors – Destructible element
Patent
1980-01-15
1981-06-02
Pate, III, William F.
Wells
Valves, closures or changeable restrictors
Destructible element
137 68R, 166162, 166319, E21B 3408
Patent
active
042706106
ABSTRACT:
A testing apparatus for use in an oil well includes an improved power mandrel and power mandrel restraining portion. The power mandrel is disposed in a cylindrical housing having an open bore therethrough and a power port and a circulating port through the walls thereof. The power mandrel includes an annular piston for moving the power mandrel in the first direction in response to fluid pressure exterior of the cylindrical housing communicated to the annular piston through the power port. A plurality of shear pins are disposed in a carrying structure arranged for forced transmitting engagement with a radially extending surface of the power mandrel upon movement of the power mandrel in said first direction. The carrying structure includes inner and outer concentric sleeves through which the shear pins are disposed, with the inner sleeve being arranged for engagement with said radially extending surface of the power mandrel. The shear pins are sheared upon relative longitudinal movement between the inner and outer concentric sleeves. The carrying structure is pressure balanced with relation to pressures in the interior bore of the cylindrical housing. A shock absorber is provided for absorbing the longitudinal impacting forces exerted upon the carrying structure, and for preventing deformation of the shear pins, due to fluctuation of the pressure exterior to said housing until said pressure exterior of said housing exceeds a predetermined value at which the shear pins are designed to shear. An improved sliding sleeve drain valve is also provided.
REFERENCES:
patent: 3042391 (1962-07-01), Glaser
patent: 3388745 (1968-06-01), Cole
patent: 3970147 (1976-07-01), Jessup et al.
patent: 4063593 (1977-12-01), Jessup
patent: 4064937 (1977-12-01), Barrington
Beavers Lucian Wayne
Duzan James R.
Halliburton Company
Pate III William F.
Tregoning John H.
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