CAJ | 학술논문

为提高大庆油田深层致密砂砾岩气藏的勘探开发效益，缩短钻井周期，降低钻井成本，开展了小井眼水平井钻井技术研究。首先，按照套管允许的弯曲半径必须小于井眼实际弯曲半径的原则，在分析φ215.9 mm弯曲井眼安全下入φ177.8 mm技术套管和φ152.4 mm钻具组合通过φ177.8 mm技术套管能力的基础上，对井身结构进行了优化；其次，考虑到目的层可能提前或滞后的情况，利用探气顶稳斜角公式计算了不同厚度储层的稳斜角，同时考虑造斜井眼尺寸以及实际地层造斜能力，对井眼轨道进行了优化；最后，根据钻遇地层的特点，对钻头进行了选型，设计了钻具组合，优选了钻井参数，最终形成了庆深气田致密砂砾岩气藏小井眼水平井钻井技术。该技术在徐深平3X井成功实施，钻井周期与常规水平井相比缩短了32.83％。这表明，该技术可为深层砂砾岩气藏的勘探开发提供新的技术手段。
위제고대경유전심층치밀사력암기장적감탐개발효익，축단찬정주기，강저찬정성본，개전료소정안수평정찬정기술연구。수선，안조투관윤허적만곡반경필수소우정안실제만곡반경적원칙，재분석φ215.9 mm만곡정안안전하입φ177.8 mm기술투관화φ152.4 mm찬구조합통과φ177.8 mm기술투관능력적기출상，대정신결구진행료우화；기차，고필도목적층가능제전혹체후적정황，이용탐기정은사각공식계산료불동후도저층적은사각，동시고필조사정안척촌이급실제지층조사능력，대정안궤도진행료우화；최후，근거찬우지층적특점，대찬두진행료선형，설계료찬구조합，우선료찬정삼수，최종형성료경심기전치밀사력암기장소정안수평정찬정기술。해기술재서심평3X정성공실시，찬정주기여상규수평정상비축단료32.83％。저표명，해기술가위심층사력암기장적감탐개발제공신적기술수단。
In order to improve the prospecting benefit ,shorten drilling cycle and save drilling cost in deep tight glutinite gas reservoirs in Daqing Oilfield ,the research on horizontal slim-hole drilling had been carried out .Firstly ,according to the principle that allowable casing bent radius must be less than the actual bent radius of wellbore ,and the casing program was optimized on the basis of analyzing the possibility that running φ177.8 mm intermediate casing in φ215.9 mm curved wellbore safely ,and the φ152.4 mm BHA passed through φ177.8 mm intermediate casing .Secondly ,as the depth of target pay zone may be shallower or deeper than that of prediction ,hold angle formula was used to calculate the hold angle of reservoirs in different thickness ,in addition ,taking the formation deflecting ability and borehole size into account in build up section ,the well trajectory was optimized .Finally ,according to the features of formations ,the type of drill bit ,bottom-hole assembly and drilling parameters were optimized ,the horizontal slim-hole drilling technology had been formed for deep tight glutenite gas reservoirs in Qingshen Gas Field .The application of this technology in Well Xushenping 3X led to a reduction of drilling cycle time of 32.83% than conven-tional horizontal well method ,it provides new technical means for exploration and development in deep tight glutenite gas reservoirs .