Key Technologies of Green Development in the Fuling Shale Gas Field

The Fuling Shale Gas Field is located in a mountainous area,with well developed underground rivers and karst caves.It also has a highly concentrated population,so the shale gas development in this field is faced with environmental protection problems.Combined with the characteristics of surface natural environment in the Fuling Shale Gas Field and features of shale gas development engineering,the main environmental issues encountered in the development of the Fuling Shale Gas Field were analyzed.Studies on intensive land utilization,water conservation and protection,environmentally neutral utilization and disposal of oil-based drill cuttings,recycling of drilling and fracturing wastewater,and green environment management mode of shale gas development were conducted.They were used in order to establish the green development technology system suitable for the Fuling Shale Gas Field.Field applications showed that after applying the green development technology,the land occupation was reduced by 62.1%,the recycling rate of drilling and fracturing wastewater reached 100%,the oil content of treated oil-based drill cuttings is less than 0.3%,and carbon dioxide emission has been reduced by 64.47×104 t.Thus,the goal of "zero pollution" was realized during shale gas field development.The green and environmental protection development technology of the Fuling Shale Gas Field has served as a valuable model in the environmental protection of large-scale development of shale gas fields in China.