海南水基钻屑中典型元素分布及其铺垫井场后对地下水的影响  

Typical elements distribution in water-based drilling cuttings from Hainan Province and their effects on groundwater after using as a pave in drilling site

作　　者：包为磊 罗飚 姚光远 舒辉秀 周奇[2] 孙英杰[1] 黄启飞[2] BAO Weilei;LUO Biao;YAO Guangyuan;SHU Huixiu;ZHOU Qi;SUN Yingjie;HUANG Qifei(School of Environmental and Municipal Engineering,Qingdao University of Technology;State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control,Chinese Research Academy of Environmental Sciences;The Third Extraction of Dagang Oilfield,China Nation Petroleum Corporation)

机构地区：[1]青岛理工大学环境与市政工程学院 [2]国家环境保护危险废物鉴别与风险控制重点实验室,中国环境科学研究院 [3]中国石油大港油田分公司第三采油厂

出　　处：《环境工程技术学报》2023年第6期2229-2239,共11页Journal of Environmental Engineering Technology

基　　金：中央级公益性院所基本科研业务专项(2022YSKY-15)。

摘　　要：铺垫井场是水基钻屑再利用的重要路径。然而,不同区域水基钻屑中元素浓度存在差异,其再利用过程中环境影响仍未全面了解。调查海南5个典型油气田钻井平台的水基钻屑,分析典型元素的分布和浸出特征,评估铺垫井场后对地下水的环境影响。结果表明,海南水基钻屑中Ni、As、Se、Sb、Pb、Hg、Tl、Mo、Ba浓度均未超过GB 36600—2018《土壤环境质量建设用地土壤污染风险管控标准(试行)》中规定的第二类用地的风险筛选值,除Tl外,其他元素浓度均与采样深度显著相关。浸出液中Pb、Tl、As浓度相对于GB/T 14848—2017《地下水质量标准》规定的Ⅲ类限值分别有36.5%、16.5%、16.5%的超标率,其中As浸出率最高,为35.7%。基于Texas模型的估算以及铺垫井场下方地下水的现场测定,所有检测项目浓度均未超过GB/T14848—2017规定的Ⅲ类限值,表明水基钻屑铺垫井场是安全的。The use of water-based drilling cuttings as a pave in drilling site is an important way for the reuse of the waste.However,the environmental impact from the reuse has not been fully understood due to the variation in the contents of elements in water-based drill cuttings from different regions.The distribution and leaching characteristics of typical elements in the water-based drilling cuttings from the drilling platforms of five typical oil and gas fields in Hainan,China,were investigated.Further,the environmental impacts on groundwater from the reuse were assessed.The results indicated that the concentrations of Ni,As,Se,Sb,Pb,Hg,Tl,Mo and Ba in the investigated water-based drilling cuttings did not exceed the corresponding risk screening values for ClassⅡland specified in Soil environment quality:risk control standard for soil contamination of development land(GB 36600-2018);and the concentrations of all elements,excluding Tl,were related with the sampling depths significantly.Compared with the limits of ClassⅢset in Groundwater Quality Standard(GB/T 14848-2017),the exceedance rates of Pb,Tl and As in the leachate reached 36.5%,16.5%and 16.5%,respectively.Among the investigated elements,arsenic had the highest leaching rate(35.7%).The results of risk estimation based on Texas model and onsite measurement of the groundwater below the pave in drilling site suggested that the use of water-based drill cuttings as a paved surface in drilling site was safe,with the concentrations of all tested items not exceeding the ClassⅢlimit specified in GB/T 14848-2017.

关 键 词：水基钻屑 典型元素 浸出浓度 铺垫井场 环境影响 

分 类 号：X705[环境科学与工程—环境工程]