摘要
钻屑是在钻井工程中产生的一种固体废弃物,通常利用水泥对其进行固化处理。然而,水泥的生产过程伴随着大量二氧化碳的排放,这不仅增加了温室气体的排放量,也对环境保护造成不利影响。针对上述情况,本文提出了微生物诱导碳酸镁沉淀固化钻屑新方法。微生物诱导碳酸镁沉淀固化钻屑力学性能研究表明,固化体的强度随着含水量和尿素浓度的增加而降低,随着活性氧化镁浓度和养护时间的增加而升高。最低强度0.21 MPa,最高强度3.5 MPa,充分说明了优选配比的重要性。FTIR、XRD和SEM等表征结果发现,微生物诱导碳酸镁沉淀产物为玫瑰花状水菱镁石(4MgCO_(3)·Mg(OH)2·4H_(2)O)和针状水碳镁石(MgCO_(3)·3H_(2)O);产物以致密的碳酸盐网络状结构将松散的颗粒胶结成结构完整的固化体,从而阐明了微生物诱导碳酸镁沉淀固化钻屑的作用机制。
Drilling cuttings are a type of solid waste generated in drilling engineering,usually treated with cement for solidification.However,the production process of cement is accompanied by a large amount of carbon dioxide emissions,which not only increases greenhouse gas emissions but also has adverse effects on environmental protection.In response to the above situation,this article proposes a new method of microbial induced magnesium carbonate precipitation and solidification of drilling cuttings.The study on the mechanical properties of microbial induced magnesium carbonate precipitation solidified drilling cuttings shows that the strength of the solidified body decreases with the increase of water content and urea concentration,and increases with the increase of active magnesium oxide concentration and curing time.The minimum strength is 0.21MPa and the maximum strength is 3.5MPa,fully demonstrating the importance of selecting the most suitable ratio.The characterization results of FTIR,XRD,and SEM showed that the microbial induced precipitation products of magnesium carbonate were rose shaped magnesite(4MgCO_(3)·Mg(OH)2·4H_(2)O)and needle shaped magnesite(MgCO_(3)·3H_(2)O);The product uses a dense carbonate network structure to bond loose particles into a structurally intact solidified body,thereby elucidating the mechanism of microbial induced magnesium carbonate precipitation and solidification of drilling cuttings.
作者
唐国旺
杨勇
邓强
赵中军
周锴
张雨
于培志
王贵和
TANG Guowang;YANG Yong;DENG Qiang;ZHAO Zhongjun;ZHOU Kai;ZHANG Yu;YU Peizhi;WANG Guihe(Beijing Urban Construction Group Co.Ltd.,Beijing 100088,China;CIGIS(China)Limited,Beijing 100010,China;China University of Geosciences-Beijing,Beijing 100083,China)
出处
《钻探工程》
2024年第3期76-83,共8页
Drilling Engineering
基金
国家自然科学基金项目(编号:41772388)。
关键词
微生物
活性氧化镁
固化
钻屑
microorganism
active magnesium oxide
solidification
drill cuttings
