Pumpesystem for undervannsbrønner

Abstract

Nowadays,electrical submersible pumping(ESP) is becoming more attractive among artificial lifting methods.The purpose of the submersible pumping is to increase bottom hole pressure. Development of ESPsystems, which are deployed through production tubing is particularly important in Norway, as there are severa lhundreds of subsea wells, which are approaching to the stage, when reservoir pressure is not enough anymore to overcomepressure loss along flowpath, no matter how much was able to decrease it. This alternative deployment method of ESP systems allows to avoid utilization of heavy workoverrigs, which are expensive and time consuming, especially for subsea-­‐completed wells. Installation of ESP systems for all subsea wells, instead, can be performed from cheaper and smaller drill ships.

Current study offers solution for obstacles faced by coiled tubing or wireline deployed ESPsystems, restores all the well barriers during each phase of ESPapplication, demonstrates final design of ESPassembly to be run into the existing subsea wells with horizontal Christmas tree and finally describes deployment procedure.

The idea of preparation of new wells during completion for prospective possible ESPdeployment has distinctive place in the study.This permits to utilize ESP systems in a more safe and inexpensive manner in the future.