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Changping, China

Wang Y.,No. 18 Fuxue Lu | Yan J.,No. 18 Fuxue Lu | Li Z.,No. 18 Fuxue Lu | Xu S.,No. 18 Fuxue Lu | And 2 more authors.
Drilling Fluid and Completion Fluid | Year: 2014

A technology of removing oil-on-cuttings by water jetting was developed for use in an oil field to completely remove oils from oil base drilling fluid cuttings. Oils retained on drill cuttings were analyzed for main constituents and heavy metal contents using water analyzer and ICP-MS method. These studies proved that the pollutants on drill cuttings were mainly oils. Some oily cuttings taken from the oilfield were cleaned with water jetting through a 40° full-cone nozzle at these conditions: pump pressure 0.4 MPa, flow rate 271 L/min, jetting time 20 s, and jetting height 110 mm. Oils retained on cuttings after treatment was only 1.32%, as measured by a Model Oil420 IR spectrophotometry for oil measurement, meaning that 95.76% of the retained oil was removed from drill cuttings, which can be directly discharged. Waste water produced in this process had EC50 value far greater than 30000 mg/L, and BC ratio greater than 25%, meaning that the waste water was non-toxic and presented no pollution to environment. ©, 2014, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.

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