Patent ID: 8813854

Claim:
A method of waterflooding a subsea reservoir, the method comprising: (a) providing a subsea reservoir having hydrocarbons therewithin; (b) providing a plurality of offshore platforms each having a wellbore in fluid communication with the subsea reservoir; (c) assembling a portable waterflooding injection system on one of the plurality of offshore platforms, the portable waterflooding injection system comprising a skid mounted submersible pump to recover sea water capable of being lifted with a standard platform crane, a skid mounted tank to hold the seawater, capable of being lifted with a standard platform crane and a skid mounted injection pump to pump the sea water into the subsea reservoir capable of being lifted with a standard platform crane; (d) injecting sea water into the subsea reservoir for a predetermined amount of time using the portable waterflooding injection system wherein step (c) further comprises connecting the submersible pump below the sea surface to pump sea water to a deck of at least one of the plurality of the offshore platforms, mounting the tank on the deck, the tank being in fluid communication with the submersible pump such that the tank receives the sea water pumped from the submersible pump; and mounting the injection pump on the deck, the injection pump being in fluid communication with the tank and the wellbore such that the injection pump receives the sea water from the tank and pumps it into the subsea reservoir; and (e) producing hydrocarbons from the subsea reservoir.