Abstract: A production pipe for production of oil or gas from a well in an oil and/or gas reservoir, or for injection of fluids into a well in an oil and/or gas reservoir, includes a production pipe with a lower drainage pipe. The drainage pipe is divided into sections with one or more inflow restriction devices which control the flow of oil or gas from the reservoir into the drainage pipe on the basis of calculated loss of friction pressure along the drainage pipe, the calculated productivity profile of the reservoir, and the calculated inflow of gas or water.

Abstract: A method and a system are disclosed for the transportation and separation of gas from liquid and solid media in one or several stages in a manner so that the pressure in the gaseous phase from an early separator stage (1) or from another gas deposit is utilized for the transportation of the fluids produced in subsequent separator stages (2, 3, 4). Gas which is separated at high pressure in an early separator stage (1) or gas from another gas deposit is fed into a separator (3) which has effected separation at a lower pressure and the high pressure gas forces out the separated fluid which is present in the separator receiving the high pressure gas. The separator stage at which high pressure gas is received from a preceding stage or another gas source, is made up of several identical separators (2, 3, 4) which alternate in carrying out the separation phase (2), output (3) and decompression (4) so that there is at all times one separator carrying out functions within one phase.