气举反循环钻进中空压机的启动风压初探  

The pilot study on start pressure of the air compressor during the air-lift reverse circulation drilling

作　　者：王桦[1,2] 郝世俊 莫海涛 

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《煤田地质与勘探》2017年第4期157-162,共6页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2016ZX05045-003)~~

摘　　要：随着气举反循环钻进技术及配套设备的不断发展和完善,其应用日益广泛,用于煤矿勘探开发领域时,确定合理的工艺参数十分关键。基于气举反循环钻进双壁钻具系统结构特点,依据牛顿第二定律求解出气举反循环钻进中岩屑被举升排出的临界速度模型,然后根据能量守恒定律,考虑压缩气体的沿程损失和局部阻力损失,建立了气举反循环钻进的启动风压模型。用Matlab对模型进行计算,分析发现井深、气液混合器的下入深度、沉没比和钻井液密度都对启动风压有影响。计算结果为确定合理的启动风压奠定了基础,为空压机的合理选配提供了依据,对保证良好的钻进效果具有重要意义。With the development and improvement of drilling technique, air-lift reverse circulation drilling is widely used in different fields. The reasonable drilling technical parameters are crucial when used in current coal exploration and development. Based on the structure characteristics of double wall drilling tools, the critical veloc-ity model is solved when cuttings are discharged by lifting of air-lift reverse circulation drilling under Newton＇s second law. Considering the loss along the way and the loss of local resistance of compressed air, the paper estab-lished the start pressure model of the air compressor for the air-lift reverse circulation in accordance with the law of conservation of energy. At last,the paper calculated the influendng factors of start pressure of the air compressor by using Matlab,the results show that the depth of the well,the depth of the air-liquid mixer and submergence ratio all have impact on the start pressure of the air compressor. The paper provides the foundation for determining a reasonable start pressure and also provides a reasonable basis for choosing the optional air compressor. The re-search on the start pressure model of air-lift reverse circulation is meaningful for optimal and fast drilling.

关 键 词：气举反循环 启动风压 岩屑举升 气液混合器 

分 类 号：P634.5[天文地球—地质矿产勘探]