南海珊瑚礁本底调查“琛科一井”钻探工艺

发布时间：2018-11-16 07:09

【摘要】：南海珊瑚礁拥有巨大的资源潜力和科研价值,通过西沙群岛琛航岛"琛科一井"的实施,拟摸清南海珊瑚礁大致分层及地质本底。从钻孔基本信息、工程概况、钻进工艺等方面,介绍和探讨了南海珊瑚礁本底调查"琛科一井"的钻探工艺。结果表明:(1)3套钻具配合扫孔、无固相钻井液配合正循环大泵量工艺异地层洗孔、"水锤效应"震动砂液化等工艺能有效处理泻湖相珊瑚砂层的埋钻事故;(2)超前钻头和半合管配合使用能确保礁格架地层岩心采取率;(3)在受钻孔摄像限制不能使用低固相钻井液条件下,不同标准多口径钻孔级配快速穿越后套管封隔是有效的成井方法。研究成果可为类似区域的珊瑚礁取心钻探提供借鉴作用。
[Abstract]:The coral reefs in the South China Sea have great resource potential and scientific research value. Through the implementation of "Chenkeyi well", the coral reefs in the South China Sea are roughly stratified and the geological background of the coral reefs in the South China Sea is studied. From the aspects of drilling basic information, engineering survey, drilling technology and so on, this paper introduces and discusses the drilling technology of "Chenke I well" in the background investigation of coral reef in the South China Sea. The results are as follows: (1) three sets of drilling tools, such as cleaning hole with three sets of drilling tools, drilling fluid without solid phase and large pump with positive circulation, washing holes in different ground layers, and "water hammer effect" vibration sand liquefaction can effectively deal with buried drilling accidents in coral sand layer of lagoon facies; (2) the use of the lead bit and the half pipe can ensure the core recovery rate of the reef framework formation; (3) under the condition that the low solid drilling fluid can not be used under the restriction of borehole camera, the casing sealing method after rapid crossing of different standard multi-caliber drilling gradation is an effective method of well completion. The results can be used for reference in coring drilling of coral reefs in similar areas.
【作者单位】：中国地质大学(武汉)工程学院;贵州省地质矿产勘查开发局一一五地质大队;
【基金】：国家科技基础性工作专项“南海中北部珊瑚礁本底调查”(SQ2012FY4910025) 贵州省地质矿产勘查开发局地质科研项目“贵州省磷矿勘查复杂地层钻探工艺研究”(黔地矿科合[2012]7号)
【分类号】：P634.5

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