气举反循环钻进中空压机的启动风压初探

发布时间：2018-03-02 02:30

本文关键词： 气举反循环启动风压岩屑举升气液混合器　出处：《煤田地质与勘探》2017年04期 　论文类型：期刊论文

【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。
[Abstract]:With the continuous development and improvement of gas lift reverse circulation drilling technology and related equipment, its application is becoming more and more extensive, when it is used in the field of coal mine exploration and development, It is very important to determine reasonable technological parameters. Based on the structural characteristics of double wall drilling tool system in reverse circulation drilling with gas lift, the critical velocity model of cuttings lifting and discharging in reverse circulation drilling with gas lift is solved according to Newton's second law. Then according to the law of conservation of energy, considering the loss of compressed gas along the path and local resistance, the starting wind pressure model of gas lift reverse circulation drilling is established. The model is calculated with Matlab, and the depth of well depth and the bottom entry depth of gas-liquid mixer are found out. Both the sinking ratio and drilling fluid density have an effect on the starting wind pressure. The calculation results lay a foundation for determining the reasonable starting air pressure, and provide the basis for the reasonable selection of air compressor, which is of great significance to ensure the good drilling effect.
【作者单位】：煤炭科学研究总院;中煤科工集团西安研究院有限公司;
【基金】：国家科技重大专项课题(2016ZX05045-003)~~
【分类号】：P634.5

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