CAJ | 학술논문

无隔水管钻井液回收钻井技术能够较好地解决深水浅部地层的钻井难题。基于圆管流量方程及其在环空中的推广应用，分别建立钻柱内和环空中钻井液全流态的井筒循环压耗计算方法。算例分析结果表明，层流状态下钻柱内和环空中循环压耗随排量增大均缓慢增加，而过渡流和紊流下循环压耗随排量增加的速度较快； RMR无隔水管钻井系统在钻井过程中存在一个临界排量，只有泵排量不小于临界排量才能够保证井筒循环的连续性；钻遇浅部地层时井筒压力中还是钻井液液柱压力起主导作用，循环压力的影响相对较小。研究内容可为我国开展深水无隔水管钻井提供一定的技术支持。
무격수관찬정액회수찬정기술능구교호지해결심수천부지층적찬정난제。기우원관류량방정급기재배공중적추엄응용，분별건립찬주내화배공중찬정액전류태적정통순배압모계산방법。산례분석결과표명，층류상태하찬주내화배공중순배압모수배량증대균완만증가，이과도류화문류하순배압모수배량증가적속도교쾌； RMR무격수관찬정계통재찬정과정중존재일개림계배량，지유빙배량불소우림계배량재능구보증정통순배적련속성；찬우천부지층시정통압력중환시찬정액액주압력기주도작용，순배압력적영향상대교소。연구내용가위아국개전심수무격수관찬정제공일정적기술지지。
Riserless mud recovery drilling technology can properly address the drilling difficulties in deepwater drilling in shallow formations?Based pipe flow equation and its application in the annulus, a wellbore circulating pressure loss calculation method for whole flow regime in drill pipe and annulus has been established?Study results show that, under laminar flow condition, pressure drop in the drill string and annulus increase slowly with the in?crease of flow rate?While under transition and turbulent flow condition, the circulating pressure drop grows faster with the increase of flow rate?RMR riserless drilling system has a critical flow rate?The pump displacement must be no less than the critical flow rate to ensure the continuity of wellbore circulation?During drilling shallow formation, the hydrostatic pressure rather than the circulating pressure drop, plays a leading role in bottom hole pressure?The study could provide technical supports for domestic deepwater riserless drilling.