Numerical Simulation Study On Rapid Separation Of Concentrated Energy Sheet Light From Oil-bearing Drill Cuttings

The use of oil-based drilling fluids poses a serious threat to the environment,and national regulations have clearly stated that oil-containing drill cuttings generated during drilling must be treated harmlessly.Due to the particularity of the location of offshore drilling platforms and the strict requirements of marine environmental protection regulations,the treatment of offshore oil-bearing drill cuttings has become a focus issue.Firstly,according to the current situation of waste oil-bearing drill cuttings heat treatment technology at home and abroad and the domestic and foreign regulations on oil-bearing drill cuttings treatment,a concentrated energy sheet light rapid separation treatment technology for offshore oil-bearing drill cuttings is proposed,and the working conditions are analyzed according to the treatment needs of offshore drilling platforms for oil-bearing drill cuttings and the actual conditions.On this basis,the scheme of chip light heat treatment module was studied,and the technical links such as material transfer system,heat source blower system,chip laser system and lean control system were discussed.The process flow of rapid separation of concentrated energy sheet light of oilbearing drill cuttings was formulated,and the main process parameters of conveyor belt moving speed,heating power and cooling box power in vertical heating and horizontal heating were designed and calculated according to the parameters such as processing temperature and processing capacity.Secondly,according to the flake light heating process and characteristics of oilbearing drill chips,an analysis model of oil-containing porous media is established based on the principles of heat transfer equation,horizontal set equation and Brinkman equation of porous medium,and the oil-bearing chip light vertical heating process and horizontal heating process are simulated through multiphysics coupling,combined with the main process parameters,six 20 KW chip lasers are set in vertical heating and 60 KW highpower chip lasers are set in horizontal heating.The temperature distribution and change law of oil-bearing drill cuttings in the two heating methods and the mass change caused by the phase transition of liquid phase oil,as well as the distribution and change law of oil phase volume fraction and diffusion velocity,and the rapid separation treatment effect of sheet light was predicted according to the numerical calculation results,and it was found that the oil removal efficiency of the vertical heating system was 99.2%,and the oil removal efficiency of the horizontal heating system was 98.3%,which reached the first and second standards of offshore oil pollutant emission respectively,and met the regulatory emission standards.Finally,on the basis of the designed sheet light treatment process,an indoor simple test platform was designed and built.The initial component and composition analysis of the oil-containing drill cuttings retrieved from the site was carried out,and the oil content of the residual oil content measured by the test equipment and the numerical simulation results were compared with the oil content measured by the test equipment under the same laser power,and the oil content error increased slightly with the increase of the thickness of the oil-containing drill cuttings,indicating that the numerical simulation and the experimental setting of the same sheet laser parameters mobile heat treatment results are roughly the same.Finally,by comparing and analyzing XRF on the initial solid phase of oil-bearing drill cuttings and the test residue after sheet photoheating,the solid phase did not melt,and the sulfur content in the residue increased slightly.At the same time,the correctness of the numerical simulation of the heating process is also verified.Through theoretical analysis,numerical simulation and experimental research,the key problems of concentrated energy sheet light rapid separation treatment of oil-bearing drill cuttings were studied,and a rapid separation treatment method of sheet light heating was formed,which provided a set of technical solutions for the rapid separation of oilbearing drill cuttings on offshore platforms.