摘要
页岩气钻井过程中,为了稳定井壁、冷却钻头、保持静液压力以及保护油气层,在进入油气层时一般使用油基钻井液进行钻进,钻进过程中产生大量的油基岩屑。为了解决页岩气及常规天然气开发产生的油基岩屑大量堆存的现象,分析广泛适用于页岩气及常规天然气开发产生的油基岩屑的合理处置工艺,通过采用现代分析测试方法,解析了油基岩屑高温煅烧预处理后产品的化学成分、矿物成分及其微观结构,提出页岩气及常规天然气开发过程中油基岩屑的资源化利用路径。研究结果表明:①油基岩屑在煅烧过程中不会排放大量的NO_(x)、SO_(2)和重金属;②油基岩屑煅烧过程中有害物质含量和生产过程中排放的污染物可以得到有效控制;③油基岩屑煅烧后灰渣性能均满足人工火山灰质混合材料技术要求,符合国家、地方相关标准要求或行业通行的可被替代原料生产的产品质量标准;④油基岩屑煅烧所得产物符合固体废物鉴别标准,有稳定、合理的市场需求,可以创造非常好的经济效益、环保效益和社会效益。
Oil-based fluid is usually employed in drilling shale gas wells while penetrating reservoirs so as to remain bore⁃hole stable,cool drilling bits,hold hydrostatic pressure and protect reservoirs.Meanwhile,there emerged a great deal of oil-based cuttings in this process.To settle their massive storage derived from the development of both shale gas and con⁃ventional gas,disposal techniques widely available for the cuttings were analyzed.Moreover,as for by-products prepro⁃cessed by high-temperature calcination,the cutting's chemical and mineral compositions as well as microstructure were an⁃alyzed by modern analysis and testing methods.On top of that,a reutilization approach of the oil-based cuttings was pro⁃posed for the development of shale gas and conventional gas.Results show that(i)the cuttings are not likely to discharge a large amount of NO_(x),SO_(2) and heavy metals during their calcination;(ii)the content of harmful substances produced in the calcination and the discharged pollutants can be controlled effectively;(iii)the properties of solid wastes from the cut⁃ting calcination meet not only the specifications on artificial pozzolanic blending materials but the requirements under ap⁃plicable national or local industrial standards accepted quality for production of replaceable materials;and(iv)the products from the calcination meet the standards to identify the solid wastes,and boast stable and rational market needs further to create excellent economic,environmental and social benefits.
作者
杨索
YANG Suo(Safety and Environmental Protection Department,Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan 610095,China)
出处
《天然气技术与经济》
2023年第2期41-46,共6页
Natural Gas Technology and Economy
