Field study of oily sludge treatment in Yanchang oilfield

Yanchang oilfield is located in arid and water-scarce areas. The ecological environment of this region is deteriorating and the pollution caused by the oily sludge is serious. The oily sludge was treated in some oil production plant of Yanchang oilfield by hot wash→ three-phase separator →pressure filter→solidify technology route. Hot wash was propitious to remove oil from oily sludge, and the removal rate could be more than 90%. The compressive strength of brick made from sludge which treated by pressure filter was more than 10 MPa, and the COD of leaching solution reached emission standards. The brick could be used for the construction of well site. This technology realized harmless treatment and resource utilization of oily sludge.