近日,中国石油塔里木油田博孜1-2井安全高效完成空气钻井任务。该井三开砾石层段采用空气钻井技术钻至井深5068米,一举刷新国内333.4毫米井眼空气钻井井深最深纪录,单趟钻最长进尺达1900米,单支牙轮钻头最长纯钻时间达272.89小时,较常规钻井提速2倍以上,日进尺、机械钻速、钻井周期等多项指标创塔里木油田历史最佳。
博孜1-2井是部署在我国最大超深凝析气田博孜-大北气区的一口开发井。不同于国外1500到4000米的中浅层常压油气藏,博孜-大北的气藏普遍埋在地下七八千米的超深层,地质构造极其复杂。

为攻克巨厚砾石层钻井提速瓶颈难题,近年来,塔里木油田加强钻井工程技术攻关,创新采用空气钻这一革命性提速技术,加快向地下超深层挺进。不同于常规钻井,空气钻技术通过压缩空气来代替常规钻井液介质,几乎无重量的压缩气柱可大大改变井底应力状态,可在钻头前方产生大范围的低应力区,使地下坚硬的岩层更易破碎,具有提高机械钻速、节约钻井成本、保护油气层等诸多优势。
塔里木油田在空气钻井的基础上,持续优化钻井提速模板,助力该井在地下超深层跑出“冲刺速度”——日均进尺119.08米,平均机械钻速达6.69米/小时,钻井周期缩短了36天。

“空气钻在该井‘大显身手’,为推动我国空气钻井技术进步、助力巨厚砾石层提速提效提供了重要实践依据。将来随着我们钻井工艺技术的不断配套完善,空气钻井技术有望释放更大潜力。”塔里木油田油气田产能建设事业部经理、党委副书记申彪表示。
“十四五”期间,塔里木油田计划在博孜-大北气区部署上钻60余口新井。届时,将在更多的井推广应用空气钻井技术,进一步加快博孜-大北万亿立方米大气区勘探开发进程,推动气区以年均百万吨增速快速上产。
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