| 摘要 |
<p>The invention relates to a method whose object it is to prevent water from coning into an oil-bearing layer (1) of a subsoil formation during the recovery of oil from the formation. This is realized by water being extracted from a water-bearing layer (2) located in connection with the oil-bearing layer (1). Said water is carried directly into a well (4) formed in the formation, through at least one inlet (6) in the wall of the well arranged close to the oil-bearing layer (1). Then the water is returned from the well (4) to the water-bearing layer (2), possibly to another stratum of the formation, through at least one outlet (8) in the wall of the well arranged at a distance from the oil-bearing layer (1). In the well (4) are arranged packers (10) sealing against the well/tubing (5) for the recovery of oil. The packers (10) are placed on the respective side of the oil-bearing layer (1). Whenever required, the well may comprise pumping equipment, such as at least one hydraulic pump (11) to be used for the return of water. Said pump (11) may be driven by means of water which is pumped down from the surface and then injected into the water-bearing layer (2), possibly into the other stratum of the formation, concurrently with the water from the water-bearing layer (2).</p> |
