Patent ID: 7762340

Claim:
Installation for enhanced oil recovery comprising in succession: a storage hopper for water-soluble polymer having a standard grain size distribution, a grinding device for dispersing the polymer, a dissolution/maturation tank for the dispersed polymer having several stirred compartments, or batch tanks, and providing a polymer solution, a pump for transferring the polymer solution under pressure in a pipeline conveying injection water for introducing a mixture of polymer and injection water into a well, wherein the grinding device comprises: a wetting cone in which the polymer is metered, said cone being connected to a primary water inlet circuit such that the polymer is prewetted in the wetting cone by a quantity of primary water suitable for obtaining a polymer suspension having a concentration of 15 to 100 g/l, at a bottom end of the cone: a chamber for grinding and draining the dispersed polymer comprising: a rotor driven by a motor and equipped with knives, a fixed stator having blades, on all or part of a periphery of the chamber, a ring fed by a secondary water circuit, the ring communicating with the chamber for spraying of pressurised secondary water on the blades of the stator and thereby releasing ground and swollen polymer on a surface of said blades and diluting the dispersed polymer to a concentration between 3 and 20 g/l.