【摘要】 通过对注气欠平衡钻水平井的新技术研究,我国基本形成了一套实用有效的注气欠平衡钻水平井的成套技术,可用于解决注气欠平衡钻水平井技术的特殊难题。新技术关键有3方面:①新型双层注气套管头,能够实现临时套管的悬挂、固定与回收和连通注气通道。②借鉴国外钻井的成功经验,结合国内套管、钻头及钻井设备的实际情况,研究出2种3个方案的合理井身结构。③设计了气液旋流混合短节、防挂坡口套管鞋、耐磨套管短节、防倒扣旋转装置等临时套管柱下部固定结构。为全面满足注气欠平衡钻水平井新技术的要求,初步拟定了配套的钻井工艺。图2表2参4更多还原

【Abstract】 As a result of the research on the new technology to drill horizontal wells with under-balance pressure by air injection, a whole set of practical and effective techniques have been developed in China to solve the special difficulties in under-balance pressure horizontal well drilling by air injection. The key technologies are reviewed; a new type of dual injection casing head, that may hang, fix and recover the temporary casing and also connect the air injection pipeline, is developed; two types of proper wellbore structure (three plans) have been put forward based on the successful drilling experience abroad and actual situation of casing, drill bit and drilling equipment in China; some bottom fixing assemblies of the temporary casing string have been designed such as air-liquid helical flow mixed nipple joint, groove casing shoe, anti-abrasive casing nipple joint and anti-backoff rotation device. Drilling technologies have also been studied to meet the requirements of horizontal well drilling with under-balance pressure by air injection.更多还原