Research and Application of Water-based Drilling Waste Treatment Technology in Chad
Chad has put forward strict requirements for the main pollutant indicators of waste drilling fluids generated during the oil exploration and development process meet the ISO international standards.The Chadian water-based drilling waste treatment technology refers to the waste treatment technology that focuses on non landing reception,dehydration and reduction separation,deep water treatment,and residual solid solidification treatment as key technical nodes.This technology utilizes mechanical centrifugation and chemical gel breaking flocculation methods to separate waste drilling fluid into solid and liquid phases.Targeted treatment research and experiments were conducted on the solid and liquid phases,respectively.Electrochemical oxidation,air flotation,ultrafiltration,and reverse osmosis membrane filtration were used to deeply treat the solid-liquid separation wastewater.The comprehensive COD removal rate of the terminal wastewater reached 98.29%.After the remaining solid phase solidification treatment,through the analysis of various indicators and parameters of the solidified leaching solution,its chromaticity,petroleum content,COD,ammonia nitrogen,and heavy metal ion concentration all meet the first level standard of GB/T 8978-1996"Integrated Wastewater Discharge Standard".The Chadian water-based drilling waste treatment equipment has been applied in drilling operation areas such as Ronier and Moundou in Chad,which not only completes the centralized treatment of waste in historical mud pits,but also implements drilling waste disposal while drilling.The water production and solid phase indicators meet the requirements of Party A in Chad,and the terminal water production indicators meet the wastewater treatment standards recommended ISO 23043"Evaluation Methods for Industrial Wastewater Treatment Reuse Processes"by the World Health Organization(WHO).
drilling wastedehydration and reduction separationadvanced water treatmentresidual solid-phasesolidification treatment
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