Hydril USA Distribution LLC

Edward Walfred Eskola

Dat Manh Nguyen

Ahmet Duman

A method of controlling bottom hole pressure in a wellbore, including pumping drilling mud into the wellbore, estimating the annular friction pressure in the wellbore, and measuring the pressure of the drilling mud exiting the wellbore. The method includes measuring the flow rate of the drilling mud exiting the wellbore, and, based on the pressure of the drilling mud exiting the wellbore, the flow rate of the drilling mud exiting the wellbore, expected annular friction pressure in the wellbore, and rotational speed of drill string in the wellbore, controlling the flow rate of drilling mud exiting the wellbore to achieve a specified bottom hole pressure.

Mud pump annular friction pressure control system and method

A method of pumping material from a sea floor to a vessel on a sea surface, including the steps of collecting material from the sea floor using a production tool, connecting the production tool to the vessel with a riser including a riser transfer pipe, and pumping the material from the production tool to the vessel using a subsea slurry lift pump positioned between the production tool and the vessel and attached to the production tool by the riser transfer pipe. The method further includes backflushing the riser transfer pipe by running seawater through the slurry lift pump into the riser transfer pipe toward the production tool.

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Houston, TX, United States of America

Edward Walfred Eskola