Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1996-11-20
1999-03-30
Dang, Hoang C.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166381, 175 454, 175 455, 175 456, E21B 2300, E21B 431185
Patent
active
058876545
ABSTRACT:
A downhole device and method for performing a function in a well. The device has a series of dedicated hydro-mechanical locks that prevent occurrence of an associated function. The hydro-mechanical locks are capable of being released directly by a respective elevated hydraulic activating pressure condition, and are constructed and arranged for sequential operation, such that a successive lock in the series cannot be released until after the hydraulic pressure condition required to release the preceding lock in the series has occurred. In a preferred embodiment, an actuator sequentially releases each lock in a series of locks, subsequently moving an operator to perform a function. A preferred implementation employs a series of resilient rings movable, sequentially, from a locking to an unlocking position, and a common actuator that effects these movements. Multiple devices of this construction are advantageously arranged in a string of tools to perform functions in any preprogrammed order by pre-selecting the number of locks in each device. Methods of performing sequences of downhole well functions are also disclosed.
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Edwards A. Glen
Huber Klaus B.
Dang Hoang C.
Ryberg John J.
Schlumberger Technology Corporation
Waggett Gordon G.
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