Development and application of anti-airlock feedback pump of gas-liquid replacement type

Due to large viscosity and poor flowability of heavy oil, high temperature steam is mostly injected to oil reservoirs to dilute crude oil and reduce its viscosity. Hydraulic feedback oil well pump can both pump oil and inject steam, and can generate downward feedback force, so it is widely used in heavy oil wells. However, heavy oil wells often have associated gas, and conventional feedback pump do not have venting function, so the pump often fails due to airlock, leading to discontinued production of oil wells. For this reason, the gas-liquid replacement anti-airlock feedback pump was developed, which was designed to be equipped with venting device, which provides a passageway to release the gas introduced into the pump, so the pump has an anti-airlock function, hence the pump efficiency is improved and its service life is extended.