Hydraulic circuit for a well tool

Details Hydraulic circuit for a well tool Hydraulic circuit for a well tool

1991-08-13

1993-02-23

Neuder, William P.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166348, 166372, E21B 2304

Patent

active

051881802

ABSTRACT:
A running tool for a subsea well utilizes a hydraulic circuit that will amplify tension pulled on drill pipe to perform various functions. The running tool has a pump cylinder which will pump hydraulic fluid once the running tool is latched into the wall assembly. The fluid is pumped out by upward movement of the drill pipe to a first function cylinder. The first function cylinder applies pressure to the well assembly to perform the first function. The operator pulls until a selected tension has been reached. Then the operator will slack off. At that moment, a pilot controlled control valve will shift to a second mode. In the second mode, continued pulling of tension on the drill pipe will supply hydraulic fluid to a second function cylinder.

REFERENCES:
patent: 3993100 (1976-11-01), Pollard et al.
patent: 4903776 (1990-02-01), Nobileau et al.
patent: 4928769 (1990-05-01), Milberger
patent: 4969516 (1990-11-01), Henderson et al.
patent: 5029647 (1991-07-01), Milberger et al.
patent: 5044442 (1991-09-01), Nobileau

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