压裂返排液处理小气量、高浓度VOCs回收工艺研究

Study on Recovery Process of Small Volume and High Concentration VOCs from Fracturing Flowback Fluid

在油田采用“水平井+体积压裂”开发过程中,从转油站三相分离器来压裂返排液节流降压后输送至存储池,用于后续复配使用。在降压过程中,VOCs废气在水体溶解度降低并大量释放,致使末端敞口返排液存储池VOCs气体排放超标,无序排放造成环境污染。通过存储池前端工艺治理,针对小气量、高浓度VOCs采用回收工艺,可有效降低存储池VOCs气体释放,从而确保环保检测达标。另外,回收的VOCs具有一定的经济效益,工程应用中开创了既环保又经济的双赢局面。

In the development process of"horizontal well+volume fracturing",the three-phase separator of oil transfer station is used to cut and depressurize the fracturing backflow fluid,and then it is transported to the storage pool for subsequent compound use.In the process of depressurization,the solubility of VOCs in water is reduced and a large amount of VOCs is released,which leads to excessive VOCs emission in the end open backflow liquid storage tank,and fugitive emission will cause environmental pollution.Through the treatment of the front-end process of the storage pool,the recovery process is adopted for the VOCs with small gas volume and high concentration,which can effectively reduce the VOCs emission from the storage pool,so as to ensure the environmental protection detection standard.In addition,the recovered VOCs have certain economic benefits,which creates a win-win situation of both environmental protection and economy in the engineering application.