Weatherford Canada Partnership

Precision Energy Services, Inc.

Joe Kinder

Robert Graham

A method of dynamically controlling open hole pressure within a wellbore having a drill string positioned therein. The method comprising the steps of pumping a fluid down the drill string, into an annulus formed by the drill string and the interior of the wellbore, and then subsequently up the annulus to the surface of the ground; selectively applying wellhead pressure to the annulus through selectively pumping an additional quantity of the fluid or a quantity of a secondary fluid across the annulus; and, controlling the application of wellhead pressure applied to the annulus by controlling one, or both, of (a) the operation of a wellhead pressure control choke, and (b) the flow rate of the additional quantity of fluid or the secondary fluid pumped across the annulus, to thereby maintain open hole pressure within a desired range.

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Houston, TX, United States of America

Joe Kinder