也门钻井技术难点与对策  

Yemen Drilling Technical Difficulties and Countermeasures

作　　者：崔卫华[1] 王长生[1] 王志刚[1] 

机构地区：[1]中国石化国际石油勘探开发有限公司,北京100083

出　　处：《石油钻探技术》2010年第5期37-41,共5页Petroleum Drilling Techniques

基　　金：国家科技重大专项"中东中亚富油气区复杂地层深井钻完井技术"(编号:2008ZX05031-004)部分研究内容

摘　　要：也门1区块、69区块、71区块,由于其地质结构复杂、压力梯度变化大,常因井漏严重、井眼失稳、地层坚硬、可钻性差等原因,造成施工中出现各种复杂情况和卡钻事故,给钻井工作带来了一系列技术难题。通过分析上述三区块的地层岩性和主要技术难点,针对性地提出了浅部钻井时采用气体泡沫钻井工艺、使用胶质堵漏水泥浆或常规水泥加纤维进行堵漏、高角度长井段裂缝性漏失井段采取边钻边漏边堵的方法、钻井液中加入封堵材料以减少掉块、提高钻井液密度的同时提高钻井液封堵性能、大井眼钻进井段采用空气锤钻井技术等技术措施。现场应用效果表明,该技术措施基本解决了也门3个区块的钻井技术难题,提高了机械钻速,节省了大量的事故处理时间,缩短了建井周期。Unexpected accidents and pipe sticking happened frequently in Yemen Block 1,Block 69,and Block 71 due to complex geological structure and pressure gradient changes,serious loss circulation,wellbore instability,hard formation,and low drillability.All these brought a series of technical difficulties.By analyzing the lithology of the three blocks and the main technical difficulties,this paper puts forward several drilling measures,including gas foam drilling fluid for shallow layer;colloid cement sealing or regular cement with fiber for lost circulation,plugging while drilling for fractured lost circulation in long section with high-angle,adding drilling fluid sealing material to prevent collapse,increasing drilling fluid density and improving sealing properties to prevent collapse,using air hammer drilling technique in larger diameter section.The field applications show that these techniques can solve the technique difficulties,increase ROP,save a lot of accident processing time,and reduce well drilling cycle.

关 键 词：井漏 卡钻 井眼稳定 机械钻速 气体钻井 也门1区块 也门69区块 也门71区块 

分 类 号：TE249[石油与天然气工程—油气井工程]