Patent ID: 7882892

Claim:
A well for production of hydrocarbons, comprising: a hole drilled down into an underground, a casing fastened to the hole wall, a production pipe that extends into the casing from the surface and down to a hydrocarbon-containing zone, a hanger on the surface in an upper end of the well, in which hanger the production pipe and casing are hung up and electrically short-circuited, and a packer arranged sealingly and electrically short-circuiting in the annulus between the production pipe and the casing, in or close to a lower end of the well, wherein the well further comprises: a primary coil arranged concentrically about the production pipe, a secondary coil arranged concentrically about the production pipe, a load connected to the secondary coil, an alternating current generator/signal unit connected to the primary coil, and at least one zone further down into the well than the electrically short-circuiting packer, connected with cables fed from the secondary coil through the packer to a further primary coil arranged about the production pipe in said zone, and with a further secondary coil arranged about the production pipe in said zone, with a load connected to said further secondary coil.