川渝地区页岩气钻井固废分类资源化处置利用

Soil Waste Classification, Resource Disposal and Utilization of Shale Gas Drilling in Sichuan-Chongqing Areas

在简要分析川渝地区主要页岩气区域长宁、威远和涪陵页岩气钻井作业主要特点基础上,重点论述了页岩气钻井不同井段及不同钻井液体系钻井固废性质特点,针对页岩气钻井水基钻井固废和油基钻屑两大类固废的资源化处置利用情况及目前存在的主要问题进行了论述,提出了川渝地区页岩气钻井固废应分井段或分不同钻井液体系进行收集并分类采用不同技术进行资源化处置利用,以达到更经济安全环保的效果。水基钻井固废就地生物处理资源化土壤利用是最优选择,第二选择是就地作为井场公路及井场场地路基建设利用,其次是制成水泥块或免烧砖,最后是转运制砖利用;脱油后的油基钻屑较好的资源利用方式是协同水泥窑焚烧处置,其次制成水泥块或作井场路基材料利用。同时针对性地提出了页岩气钻井固废分类处理利用等方面的建议措施,对油气勘探钻井环保决策管理具有一定参考价值。

Based on a brief analysis of the main characteristics of shale gas drilling operations in Changning, Weiyuan and Fuling areas in Sichuan-Chongqing areas, this paper focuses on the characteristics of drilling solid waste in different drilling well section and different drilling fluid systems on shale gas, the resource disposal and utilization of water-based solid waste and oil-based drilling cuttings, as well as the other main problems existing. In addition, this paper puts forward solid wastes in shale gas exploitation in Sichuan-Chongqing area should be collected according to well section or drilling fluid system, and then be recycled with different disposal technologies to achieve the goal of economic, security and environmental protection. Water-based drilling cuttings in situ biological treatment and resource utilization is the best choice;the second option is to use it as foundation construction of well site and road, then used as raw materials for cement or unburned bricks in local area;the last is transfer to other places for brick making. On the other hand, the best resource utilization mode of oil-base drilling cuttings after oil removal should be collaborative disposal of cement kilns, followed by use as cement raw materials or subgrade materials of well site. This paper also puts forward corresponding suggestions and measures about classified treatment and utilization of solid waste from shale gas drilling etc, which has a certain reference value and guiding significance for managers and workers of environmental protection decision-making in oil and gas exploration drilling.