Patent ID: 7249634

Claim:
An apparatus for the production of a subsea petroleum well ( 10 ) wherein fluids originating from a reservoir ( 14 ) flow toward the interior of said subsea petroleum well ( 10 ), said apparatus comprising: a Christmas tree manifold ( 6 ); a casing ( 2 ) whose upper end is connected to the Christmas tree manifold ( 6 ); a production tubing ( 5 ), installed in the interior of the casing ( 2 ), whose upper end is connected to the Christmas tree manifold ( 6 ); hydraulic pump equipment ( 3 ) connected to the lower end of the production tubing ( 5 ); an injection pump ( 9 ) which provides hydraulic fluid to the hydraulic pump equipment; said apparatus being characterized by being additionally provided with: a suction tubing ( 20 ) which connects the suction inlet of said injection pump ( 9 ) to a tank of hydraulic fluid ( 8 ) positioned on the surface in a service unit ( 40 ); a hydraulic fluid conduction tubing ( 12 ) which connects the discharge outlet of said injection pump ( 13 ) to an injection tubing connection point ( 13 ), located on the Christmas tree manifold ( 6 ); an injection tubing for hydraulic fluid ( 4 ) which connects the injection tubing connection point ( 13 ) to the hydraulic pump equipment ( 3 ): wherein the injection pump ( 9 ) is installed in proximity to the underwater petroleum well ( 10 ) and an external portion of the injection pump ( 9 ) operates in contact with seawater.