초록 ▼

A release mechanism for use in a well tool that requires a hydraulic piston area to be equalized with a minimum force. A valve seat and valve element are positioned in a fluid passageway for actuating the assembly. A rod having a first and second section is connected to the assembly and movable for

A release mechanism for use in a well tool that requires a hydraulic piston area to be equalized with a minimum force. A valve seat and valve element are positioned in a fluid passageway for actuating the assembly. A rod having a first and second section is connected to the assembly and movable for moving the second section into the valve seat. The second section has a smaller cross-sectional area and smaller length than the first section. The area of the valve seat is less than the cross-sectional area of first section but larger than the second section. The release mechanism allows the sealing area to be reduced without reducing the strength of the rod.

대표청구항 ▼

In a well tool having a housing with hydraulic piston and cylinder assembly therein for actuating said tool, said housing including a fluid passageway in communication with the piston and cylinder assembly and adapted to be in communication with control fluid at the well surface, the improvement in

In a well tool having a housing with hydraulic piston and cylinder assembly therein for actuating said tool, said housing including a fluid passageway in communication with the piston and cylinder assembly and adapted to be in communication with control fluid at the well surface, the improvement in means equalizing hydrostatic pressure acting on the assembly comprising, a valve seat and valve element positioned in the fluid passageway for closing the passageway when the assembly is actuated by control fluid, a rod having first and second sections, said rod connected to the assembly and movable by the assembly for moving the second section into the valve seat, said second section having a smaller cross-sectional area and smaller length than the cross-sectional area and length of the first section, and the area through the valve seat being less than the cross-sectional area of the first section but larger than the cross-sectional area of the second section.