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Pressure Safety Device for Downhole Annular Pump

IP.com Disclosure Number: IPCOM000029220D
Publication Date: 2004-Jun-18
Document File: 2 page(s) / 121K

Publishing Venue

The IP.com Prior Art Database

Abstract

The Invention was made in the frame of the TurboLift project. TurboLift is a new while drilling tool to actively reduce the annular pressure. A Positive Displacement Motor drives a Progressive Cavity Pump. The pump reduces the annular pressure below its location in order to compensate for hydraulic frictional losses in the wellbore. There is a potential risk of reducing the wellbore pressure more than expected due to performance change of the motor pump system. Performance depends on operating time (wear), temperature, fluid type. The result of a too high pressure reduction might be a underbalanced situation causing wellbore stability problems or even a kick. For that reason a new pressure safety device has been developed to limit the maximum differential pressure created by the pump. In contrast to existing devices, which equalizes the differential pressure after they have opened, the new device allows to work still with pre-defined pressure conditions.

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The Invention was made in the frame of the TurboLift project. TurboLift is a new while drilling tool to actively reduce the annular pressure. A Positive Displacement Motor drives a Progressive Cavity Pump. The pump reduces the annular pressure below its location in order to compensate for hydraulic frictional losses in the wellbore. There is a potential risk of reducing the wellbore pressure more than expected due to performance change of the motor pump system. Performance depends on operating time (wear), temperature, fluid type. The result of a too high pressure reduction might be a underbalanced situation causing wellbore stability problems or even a kick. For that reason a new pressure safety device has been developed to limit the maximum differential pressure created by the pump. In contrast to existing devices, which equalizes the differential pressure after they have opened, the new device allows to work still with pre-defined pressure conditions.