Wells – With electrical means
Patent
1991-03-15
1992-09-15
Dang, Hoang C.
Wells
With electrical means
166120, 166123, 166212, E21B 2304
Patent
active
051469839
ABSTRACT:
A hydrostatic setting tool, adapted for setting an anchored device in a wellbore, includes a housing having a pair of ports exposed to well fluid at hydrostatic pressure. The ports lead to a shoulder of a setting mandrel. A barrier is disposed diametrically across the setting tool and an oil chamber is disposed between the setting mandrel and the barrier. The barrier includes an oil metering orifice disposed through a center thereof. A selectively operable apparatus, initially disposed in a closed position and blocking the oil metering orifice, is adapted to change from the closed position to an open position in response to a current delivered thereto from the well surface. An air chamber is disposed on the other side of the barrier. The well fluid places hydrostatic pressure on the shoulder of the setting mandrel thereby placing the same pressure on the oil in the oil chamber. When the current is delivered to the selectively operable apparatus blocking the oil metering orifice, the apparatus changes from the closed position to an open position thereby opening the oil metering orifice and allowing the oil in oil chamber, at hydrostatic pressure, to transfer to the air chamber via the orifice. This allows the setting mandrel to move in the setting tool thereby setting the anchored device. A tension sleeve shears off, at a point near the anchored device, in respone to continued movement of the setting mandrel thereby disconnecting the setting tool from the anchored device.
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Edwards A. Glen
Hromas Joe C.
Huber Klaus B.
Bouchard John H.
Dang Hoang C.
Garrana Henry N.
Schlumberger Technology Corporation
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