Downhole tool with pressure balancing

Details Downhole tool with pressure balancing Downhole tool with pressure balancing

2007-11-06

2007-11-06

Dang, Hoang (Department: 3672)

Wells

With jar means for releasing stuck part

C175S297000, C175S304000

Reexamination Certificate

active

10700701

ABSTRACT:
A downhole tool is provided that creates balancing forces that allow a tool such as ajar to continue to function when intrusion of gas into the fluid chamber of the jar occurs to cause gas pressure in the jar to exceed hydrostatic pressure. The excess pressure is balanced by forming an area acted on by the gas pressure equal to the cross-sectional area of the mandrel, such that the forces on the mandrel are equal and opposite.

REFERENCES:
patent: 3658140 (1972-04-01), Berryman
patent: 3889766 (1975-06-01), Sutliff et al.
patent: 6481495 (2002-11-01), Evans

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