气体钻井井眼排液工艺技术及应用

为了提高气体钻井作业时效,保障气体钻井作业快速安全进行,在常规气体钻井井眼排液方法(气举排液法和充气排液法)的基础上,提出了一种新方法——交替排液法。气举排液只使用气体注入设备空压机和增压机,充气排液和交替排液还需要使用液体注入设备钻井泵。介绍了井眼排液原则、钻具组合、降低井筒液柱压力的作业方式和井眼排液施工工艺;实例分析了气举排液法、充气排液法和交替排液法的现场应用效果。对比分析表明,浅井排液中,可采用一次性气举排液;深井排液中,采用分段气举排液耗时达30多小时,采用充气排液或交替排液仅需几小时,其中交替排液法时效更高,值得推广应用。 

Well Unloading Technology in Gas Drilling and Its Application

To enhance the efficiency and ensure the safety and speed of gas drilling,a new unloading method named alternative unloading was put forward on the basis of conventional unloading method(gas lifting and aerated unloading).Except gas injection equipment for gas lifting unloading,drilling pump is used as liquid injection equipment for aerated unloading and alternative unloading.The paper presents the cases and results of gas lifting unloading,aerated unloading and alternative unloading.Through the comparison and analysis of their field application,it is found that gas lifting is suitable for the shallow well one-off unloading;and aerated unloading or alternative unloading is suitable for the deep well,and alternative unloading is more efficient.This technology is worthy to be promoted.