文档介绍：譬791782 硕士研究生毕业论文密级:I类论文题目:沁水盆地樊庄区块34煤煤层气产能研究专业: 研究生: 油气田开发工程曾雯指导教师: 单文文教授级高工副指导教师: 中国石油勘探开发研究院二oo五年四月摘要我国煤层气资源相当丰富。开发利用煤层气能够缓解我国能源短缺的紧张局面,对于减少煤矿瓦斯事故也是至关重要的。本论文分析了沁水盆地樊庄区块3“煤的试采产量现状及影响该区产量的主控因素,结合数值模拟方法预测了沁水盆地樊庄区块34煤层气的产能和采收率,探索了该区实现经济开发的途径,对今后煤层气开发具有重要的指导意义。樊庄区块34煤煤层含气量高、厚度较大,但是煤层渗透率低,是制约该区块煤层气开发的重要因素。因此,本文提出采用直井压裂和定向羽状水平井两种方式开采该区块。用直井压裂方式开采,沁水煤层气田樊庄区块产能属于中一低产水平。,含气量为25m3/t,在此条件下预测20年单井平均日产气为1800~3000 m3。在沁水樊庄区块试采区梅花形井网500m井距为最佳井距。经济开采年限为20年,×108m3,%。情况下,方案才有经济效益。采用定向羽状水平井开采樊庄区块34煤,煤层气单井产量与直井比较有大幅度的提高,具有良好的经济效益。预计10年平均单井产气量大于3×104m3,采收率接近50%。但是井开发煤层气的先例,因此运用该项技术存在较大的风险,建议开展定向羽状水平井先导性实验并进行动态跟踪和评价。主题词沁水盆地煤层气开发产能预测经济评价 Abstract The present pilot wellperformance andthefactorseffecting thegasproduction rate areanalyzed forthecoalbed methane inFanzhuang sectionofQinshui basin inShanxi province,then theproductivity andrecovery factorofthissection areforecasted in numerical results CBU beused asdirections toeconomic development of theeoalbed methane inFanzhuang section. The gas content ishi曲in theseam 3,roughly 25m3/,itspermeability is low permeability limited the wellproduction rate,Based on the sub—surface geology,the articlepresents vertical well with疔acture technology or pinnate horizontal multilateral well todevelop the coalbed methane inFanzhuang section.. Itisestimated thattheaverage gas rateofverticalwell withfracturetechnology is 800~3000 m5/dintwenty years. Based onnumerical simulation andeconomic evaluation,the quincunx patterns with optimal 500 metre wellspacing mended aswellpatterns todevelop coalbed methane cumulative gasproduction isforecasted × 108m3,and recovery %during 20years economic production p谢ods with gasprice above 0。74yuart/m3. With atleast3×104m3/d/wellgas rateforecasted in10years,and recovery rate about 50%,the productivity ofpinnate horizontal multilateralwellismuch higherthan ,ther