气体钻井技术在准噶尔盆地火北地区的现场应用

Application of Gas Drilling to Huobei Area, Junggar Basin

针对准噶尔盆地火北地区常规钻井工艺钻速低、周期长的问题,为缩短钻井周期、加快勘探进程,采用气体欠平衡钻井工艺技术,介绍了气体钻井技术的流程和主要设备,以及所特有的雾化钻井技术、干井下套管固井技术、取芯技术和空气/雾化的钻井液转换技术。分析了火北021井与022井的现场实施应用效果,得出气体/雾化钻井技术能有效提高机械钻速,较好地降低井斜程度且更易发现油气层,并提出加强现场钻具使用和管理、及时进行钻具探伤与倒换的建议。

Some problems occuring in a conventional drilling in Huobei area, Junggar Basin, include low drilling rate and long drilling cycle. So, some technologies of gas underbalanced drilling should be used to shorten the drilling cycle and speed up an exploration process. Here, many gas drilling technologies, containing mist drilling, casing running cementing in a dry hole, coring, and air and/or mist drilling-fluid conversion, are presented in terms of their process and main facilities. Moreover, after their application to Huobei 021 and Huobei 022 wells, it's found that the technology of gas and/or mist drilling can increase a rate of penetration(ROP),decrease a well deviation, and discover oil and gas layers more easily. At last, some suggestions are made, such as to strengthen an insitu utilization and management of drilling tools, and to detect and change some failure tools in time.