Retrievable stress and torque reducing tool

Details Retrievable stress and torque reducing tool Retrievable stress and torque reducing tool

2007-10-09

2007-10-09

Bagnell, David (Department: 3672)

Wells

With eduction pump or plunger

Having sediment trap or deflector

C166S068000, C417S545000

Reexamination Certificate

active

11409845

ABSTRACT:
A stress and torque reducing tool has a plunger that reciprocates inside of a body. The tool is connected between the pump and the sucker rod string and reduces stress transmitted therebetween. The body has upper and lower fluid ports to allow the ingress and egress of well fluids from the body as the plunger reciprocates. If the tool fails, it typically does so by the body breaking into two parts, namely the upper body and lower body, at the upper fluid ports. The upper end of the plunger is provided with a fishing neck. Thus, upon failure of the body at the upper fluid ports, the fishing neck is exposed and can receive a fishing tool for retrieval of the tool and the pump.

REFERENCES:
patent: 4963078 (1990-10-01), Agee
patent: 6068052 (2000-05-01), Dobbs

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