DOWNHOLE CHOKE TECHNIQUE APPLIED IN SULIGE GAS FIELD

Sulige gas field is a kind of gas field with low pressure, low permeability and low productivity. With quick decline of the reservoir energy, forming of hydrates and fluid accumulation in the wellbore are easy to occur. This paper analyzed the effect of downhole choke on pressure and temperature, finding that the downhole choke can prevent hydrate forming, improve liquid carrying capacity of the gas and relieve bottomhole pressure surges under low production rates. Early application of downhole choke in Sulige gas field can reduce methanol injection, prolong plateau production period of gas wells, and improve the final economic efficiency.