Abstract: The present invention relates to a method and a device in connection with a method for transport or flow of gas and liquid in a pipe, by which method there is in the overall or part of the pipe mounted static mixing elements for achieving favorable flows in the pipe, and for the purpose of being able to stimulate petroleum wells which have terminated production or almost terminated production due to high pressure head resistance, it is according to the invention suggested that the pipe which is used, is a production tubing or production string extending substantially vertically from a production reservoir having a low pressure, and that the mixing elements residing in the tubing is arranged in such a manner that the gas bubbles in the oil are distributed optimally as carriers in the oil, for thereby reducing and evening out the pressure head resistance in the tubing.