Well having inductively coupled power and signal transmission

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
• several hydrocarbon-producing zones, with load comprising instrumentation and an adjustable choke valve arranged in each zone.

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, and
• an alternating current generator/signal unit connected to the primary coil, and
• wherein the load comprises an inductive feed-through in the form of a divided transformer, with an outer part arranged outside the production pipe and an inner part arranged releasably inside the production pipe, with coupling from said inner part to sensors or means that are releasably arranged inside the production pipe.

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, and
• an alternating current generator/signal unit connected to the primary coil, and
• wherein the primary coil and the secondary coil each comprise two or more coils coupled in parallel and mutually phase locked.