With the new oil wells being put into operation one after another in offshore C oilfield,the oil production of the oilfield has been greatly increased,and the process treatment effect has declined,the crude oil primary separator and the interface emulsion of electric deoiled water were serious,the sewage treatment effect was poor,and the oil content exceed the standard,which seriously affect the normal production of the oilfield.In order to solve this problem,through indoor selection,the reverse demulsifier BH-612 was selected to improve the quality of wastewater in the process,and good results were obtained in the field practice and application,which fully guaranteed the stable operation of the on-site production process.
The supply and demand status of butadiene at home and abroad were analyzed,and the future development trend and the development suggestions of China were put forward.
Isobutane compressor motor was equipped with a positive pressure through the risk control system,by purging gas(nitrogen)into the motor cavity to maintain a small positive pressure to achieve explosion-proof purpose,to prevent external flammable and explosive gas(isobutane)into.The system monitored the internal pressure of the motor housing by setting an intermediate pressure sensor,and adjusted the nitrogen gas supply according to the pressure change.This optimization project saved the amount of purging nitrogen by adjusting the pressure value of the intermediate pressure sensor.
With the Kigali Amendment officially entering into force for China,China will strengthen the control of non-carbon dioxide greenhouse gases such as hydrofluorocarbons(HFCs).The usage and maintenance amount of HFCs in Beijing commercial refrigeration industry were investigated,and suggestions for the next step of HFCs elimination and replacement was put forward.
In response to the traditional fluorine-containing acid system in the application process,there were problems such as high corrosiveness,secondary precipitation,and lead to the loose rock skeleton.In this paper,a low corrosion,effective inhibition of secondary precipitation,green environmental protection and non-fluorinated clay damage plugging removal agent was successfully developed.The experimental results showed that the clay damage plugging removal agent has significant dissolution effects on chlorite,montmorillonite,kaolinite,and illite,with dissolution rates of 33.0％,32.7％,21.6％,and 29.5％,respectively.This plugging removal agent mainly destroyied the microstructure of clay by extracting metal elements such as Si,Al,Ca,Fe,Mg and so on from the clay structure.Meanwhile,it minimized the impact on the strength of rock skeleton,has better retardation,corrosion inhibition and inhibits secondary precipitation,which can deeply removal clay mineral pollution and ensure construction safety.In addition,the plugging removal agent has excellent anti-emulsification and demulsification.And the back-flow fluid has little impact on the offshore electric stripping process.The permeability recovery rate of the core flooding reached 114％,indicating the remarkable effect of the plugging removal.Therefore,this innovative technology provided an efficient,safe,and environmentally friendly plugging removal system for the management of low-productivity and inefficient wells.And it was expected to be widely used in offshore oilfields.
