CAJ | 학술논문

为安全有效地从泥线以下切割海上废弃井套管和管桩，研究开发了磨料射流切割技术。基于高能磨料射流从套管串内部一次冲蚀切割多层管材的技术思路，设计了液压马达驱动式和水力自旋式切割装置，经过室内试验优化喷嘴、泵压、转速和磨料类型等参数，形成了配套的磨料射流切割多层套管工艺。地面综合切割试验及在曹妃甸161井的现场应用表明，该切割装置约在6 h内即可割断4层（φ244.5～φ762.0 mm）被水泥固为一体的套管，满足现场应用的要求，而且可利用工程船作业，能节省海洋钻机作业费用。实践证明，磨料射流切割技术具有切割能力强、效率高、环保无污染等特点，为国内海上油气田弃井作业提供了新的技术手段。
위안전유효지종니선이하절할해상폐기정투관화관장，연구개발료마료사류절할기술。기우고능마료사류종투관천내부일차충식절할다층관재적기술사로，설계료액압마체구동식화수력자선식절할장치，경과실내시험우화분취、빙압、전속화마료류형등삼수，형성료배투적마료사류절할다층투관공예。지면종합절할시험급재조비전161정적현장응용표명，해절할장치약재6 h내즉가할단4층（φ244.5～φ762.0 mm）피수니고위일체적투관，만족현장응용적요구，이차가이용공정선작업，능절성해양찬궤작업비용。실천증명，마료사류절할기술구유절할능력강、효솔고、배보무오염등특점，위국내해상유기전기정작업제공료신적기술수단。
In order to efficiently and safely cut casing and structural poles below mudline in offshore wells ,abrasive water jet (AWJ) casing cutting technology has been developed to cut abandoned offshore fa-cilities .Based on technical advancement of AWJ cutting through multiple casing strings ,hydraulic motor driven and self-rotating water jet cutting device were developed for field applications .Parameters such as jet size ,pump pressure ,rotation speed ,abrasive material types ,etc .were optimized through systematic labora-tory tests and abrasive water jet cutting technique was formed .Full scale surface and downhole tests in the offshore Well CFD1 6 1 showed that this AWJ cutting device could cut through 4 cemented casing strings (sizes :φ244.5 ,φ339.7 ,φ508.0 and φ762.0 mm ) in less than 6 hours ,w hich met field application require-ments .In addition ,the system is compatible with engineering support vessel instead of mobile offshore drilling units so as to further reduce its cost .Its practical application shows the AWJ device with advanta-ges as strong cutting capability ,high cutting efficiency and environmental friendliness ,would provide a new offshore technical solution to abandonment of offshore oilfield facilities and structures in China .