Abstract: In order to solve the problems that the individual artificial lift techniques can’t meet the requirement of deep-well pumping, based on the theory of artificial lift techniques and the composite structure of pipe strings,the combination technical schemes and principles are proposed. In view of the virtues of gas-lift technique, thecombination of deep well-pump and gas-lift, especially the combination of electric submersible pump and gas-lift（ESP-GL）has obvious superiority and is fit for the high flow rate deep pumping. The structures of the lift pipe stringsare discussed and implement measures are put forward. In order to overcome side effects of the traditional gas-liftthat could lead to the casing fluid level lowering and influence lower deep-well pump quality, the minor diametertube gas injection technology which can provide condition for combination with other artificial lift techniques isproposed. The calculations carried out by the proposed ESP-GL combination method show that if the ESP dischargerate and lifting pressure head are not changed, the pumping depth of the ESP can reach 6 000 m after relay liftingwhich provides technical support for the high flow rate lifting of the deep zone reservoir; if the depth of ESP is
unchanged, airlift can enhance the production of gas well.

Key words: electric submersible pump（ESP）, gas lift（GL）, combination lifting, process, deep pumping