Patent ID: 7854261
Filing Date: 2010-12-21
Classification: E21B

Abstract:
1. A method of separating, in a production well, water from a water- and hydrocarbon-containing production flow emanating from at least one surrounding production formation; and of injecting, in the production well, a resulting water-containing liquid into at least one surrounding disposal formation, whilst a resulting hydrocarbon-containing liquid is produced out of the production well; in which the method comprises the following steps: (A) to arrange a first flow channel and a second flow channel within the production well, wherein: (B) from the production formation, to direct the production flow via the first flow channel and further to said upstream side of the water separation device, at which upstream side the production flow has a pressure (P (C) to arrange the second flow channel with an internal pressure manipulation region having a pressure (P (D) in water suction mode, to adjust the pressure (P the action of which generates a pressure difference (P (E) to produce the hydrocarbon-containing liquid in the first flow channel out of the production well; and (F) via the second flow channel, to inject the water-containing liquid into the disposal formation under the influence of an injection pressure (P to connect the second flow channel with at least one external, first gas source; by means of gas from the first gas source, to form a first gas column having a gas pressure (P to connect the first gas column in a pressure-communicating manner with the pressure manipulation region, whereby the gas pressure (P in water suction mode, to adjust the gas pressure (P