David J Mandeville, 68PO Box 2014, Mariposa, CA 95338

6481496, Nov 19, 2002

Jun 14, 2000

09/593840

Stephen L. Jackson - Richmond TX
David R. Mandeville - Sugar Land TX

Schlumberger Technology Corporation - Sugar Land TX

E21B 2306

166120, 166123, 166125

A releasable packer has a control line therethrough. A hydraulic release mechanism of the packer is controlled from the surface by application of flow and pressure. A modification of the packer and release mechanism using resettable collets and return springs allows multiple sets and releases of the packer.

6516890, Feb 11, 2003

Oct 12, 2000

09/689417

Stephen L. Jackson - Richmond TX
John R. Whitsitt - Houston TX
David R. Mandeville - Sugar Land TX

Schlumberger Technology Corporation - Sugar Land TX

E21B 2300

166381, 166181, 166237, 1663324

A protective member that is disposed within the longitudinal bore of a well tool, the well tool including an actuating mechanism adapted to be mechanically activated from the longitudinal bore. The actuating mechanism includes an engagement section, preferably a profile. The protective member, preferably a sleeve, substantially covers the actuating mechanism while leaving the engagement section exposed to the longitudinal bore. In a preferred embodiment, the sleeve is slidably disposed within the longitudinal bore between a first position and a second position. A biasing mechanism biases the sleeve into the first position, in which a sleeve first end is proximate the profile. Operation of the apparatus enables a method for preventing the inadvertent mechanical activation of the actuating mechanism of a well tool as peripheral equipment is passed through the longitudinal bore of the well tool.

6298916, Oct 9, 2001

Dec 17, 1999

9/466386

Raymond J. Tibbles - Missouri City TX
James A. Pramann - Sugar Land TX
Stephen L. Jackson - Richmond TX
David R. Mandeville - Sugar Land TX

Schlumberger Technology Corporation - Sugar Land TX

E21B 4304

166278

A completion string for use in a wellbore includes a main conduit, such as a production tubing, and one or more alternate path conduits, such as shunt tubes, that extend generally in parallel with the main conduit. A flow control device is positioned in each alternate path conduit to control flow through the alternate path conduit. The one or more alternate path conduits may be adapted to carry gravel slurry to perform gravel packing operations. The one or more flow control devices in the one or more alternate path conduits may be actuated to the open position to allow communication of the gravel slurry to multiple zones in the wellbore. Once the gravel packing operation is completed, the one or more flow control devices may be actuated to the closed position to block fluid flow communication between multiple zones through the alternate path conduits during operation of the well. Other types of fluids may be communicated through the one or more alternate path conduits, such as fracturing fluids.