Halliburton Energy Services, Inc.

Patrick F Campbell

William David Henderson

Mark E P Dawson

Jay B Shivers

A multi zone isolation tool () for use in a subterranean wellbore includes a first tubular and a second tubular disposed within the first tubular forming an annular flow path () therebetween and a central flow path () through the second tubular. An annular valving assembly () is positioned in the annular flow path () and a central valving assembly () is positioned in the central flow path (). The central valving assembly () is operably coupled to the annular valving assembly () such that when the central valving assembly () is in a closed position, a pressure variation in the central flow path () will operate the annular valving assembly () from a closed position to an open position.

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Dallas, TX, United States of America

Patrick F Campbell