The paper detailed the technical specification, equipment, construction technology and technical measures of enlarging borehole in shaft for coalbed methane with field cases.
通过工程实例，介绍了煤层气掏穴井施工的目的、技术要求、设备机具、施工工艺，以及掏穴作业和技术措施。
Introduction is made to the selection and optimization of accessories in fore process and rear process plus the specification as well as measures against fuzzy yarn.
详细介绍了前、后纺各种纺纱器材的优选和工艺参数的优化，以及其他控制成纱毛羽的措施。
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