In recent years,with the gradual increase of oil and gas exploration,the produced water of oil and gas fields has increased year by year,bringing many environmental problems,and the content of associated elements such as lithium,potassium and bromine in the produced water of some oil and gas fields has exceeded the industrial mining grade,which is suitable for comprehensive mining or separate mining.Therefore,it is of great practical significance to analyze the feasibility of comprehensive utilization of associated elements in oil and gas field water and put forward feasible technical routes.The water quality characteristics and resource distribution characteristics of oil and gas field water were summarized.And the research and applications of extraction technologies of associated elements lithium,bromine and potassium from deep brine such as the produced water of oil and gas field were anatomized.The applicability and existing problems of lithium,bromine,and potassium extraction technologies in salt lake brine for oil and gas field water were elaborated.Combined with the extraction technologies and applications of associated elements in oil and gas field water,it is considered that extraction of lithium by adsorption,extraction of potassium by hot solution and cold crystallization(or cold decomposition-flotation process)and bromine extraction by electrooxidation are feasible technical routes for comprehensive utilization of associated valuable elements in oil and gas field water.At present,the industrialization of oil and gas field water is only aimed at lithium extraction,and the whole process of comprehensive utilization of associated resources should be opened up as soon as possible,and the comprehensive utilization of oil and gas field water associated resources and standard treatment process should be sought for environmental protection and economy,so as to provide theoretical support for further industrial application and help the green and high-quality development of the oil and gas industry.
produced water of oil and gas fieldassociated elementslithium extractionbromine extractionpotassium extractionadsorbent
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