OFF-SHORE DRILLING PLATFORM AND METHOD FOR PREVENTION OF WATER BASIN CONTAMINATION WITH FORMATION WATER Russian patent published in 2010 - IPC E02B17/00 

FIELD: oil-and-gas industry.

SUBSTANCE: off-shore drilling platform includes supports and a platform, where oil production well head equipment installed, connecting production well tubing string with separator inlet, which first outlet connected to a oil collection tank, the second outlet connected via injection pump to water supply into injection well pipeline, which horizontal part located under a reservoir. Between the separator's second inlet and the water supply pipeline an additional tank for formation water installed and a waster pump for its supply from the separator. A piston pump used as a formation water injection pump, between the separator first outlet and the oil collection tank located an intermediate pump. For oil pumping into the tanker, the platform equipped with a sea located mooring buoy, fixed to the sea bottom with a rope or a chain and connected with oil pipeline via flexible sleeve, the flexible sleeve routed by the sea bottom from the platform, fixed on the mooring buoy, connected to a valve executed with a rapid-action coupling, for example with bayonet one, for connection to the tanker's riser. A flow metre and pressure pump installed between the oil collection tank outlet and the oil pipeline. In the production well reservoir well filters and well submersible pump installed, in the injection well filters installed. The mentioned above tasks solved in the method for prevention of water basin contamination, which includes production of oil, containing formation water, the water separation, in a way that the water separated from oil then pumped in to the well horizontal part, located bellow the reservoir. Separate associated gas at the same time. Separate rock hard particles at the same time.

EFFECT: prevention of water basin contamination with formation water.

10 cl, 2 dwg