As the situation of energy supply becomes more and more severe, the construction of oilfield projects also pays more attention to energy saving and emission reduction. In the process of oil and gas production and treatment will produce a large amount of sewage, the temperature is between 50 ~ 70 ℃, its traditional treatment method is recharge and external discharge, in the drip hard to find oil fields in the Xinjiang region, the economy of this treatment is extremely poor, and is not environmentally friendly. The waste heat recovery system of sewage is equipped with the direct-fired LiBr absorption heat pump of Hope Deepblue with the help of the heating circulation system, which consumes only a small amount of gas, can fully draw the low-grade heat from sewage, and raise the temperature of the heating circulating water to 90~95℃ to supply the oilfield with industrial heat preservation, heating of crude oil, and heating, which is less than the direct heating of boiler and saves 1/3 of the gas. This direct-fired LiBr absorption heat pump does not need compressor, uses gas as the main driving energy, consumes very little electricity, can minimize energy consumption and environmental pollution, and is very suitable for use as waste heat recovery equipment in oil and gas fields.