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煤层气水平井技术应用分析及优化
引用本文:张双斌,刘国伟,季长江.煤层气水平井技术应用分析及优化[J].煤炭工程,2021,53(3):93-97.
作者姓名:张双斌  刘国伟  季长江
作者单位:晋城职业技术学院矿业工程系, 山西晋城 048026;中国石油华北油田山西煤层气勘探开发分公司, 山西晋城 048026;煤与煤层气共采国家重点实验室, 山西晋城 048026
基金项目:山西省教育科学十三五规划课题资助项目;晋城市市级重点科技研发项目
摘    要:全国主要煤层气区块15年以上的开发实践表明,不同地质条件下,相同的水平井技术开发效果差异较大,可复制性差,亟需进行技术优化.基于水平井技术应用典型案例的数据统计分析,研究了井型、井身结构、完井方式、储层强化技术、排采装备及工艺的优化方法.结果表明,井型和井身结构对煤层气高效经济开发起决定性作用.U型和L型水平井最具推广...

关 键 词:煤层气  水平井  井身结构优化  分段压裂  精细化排采
收稿时间:2020-06-16
修稿时间:2020-09-21

Optimization and application analysis on technology of CBM horizontal wells
Abstract:The practical development experiences of CBM horizontal wells more than 15 years for major CBM blocks in China shows that there are wide variation in development effectiveness and poor repeatability among the same technology of horizontal wells under the different geological conditions. Therefore, the optimal technology of horizontal wells needs to further be investigated. Based on typical cases data statistical analysis of CBM horizontal wells technology application. The optimized methods of horizontal wells on the well types, the well structure, the completion method, the stimulation method and the drainage equipment & technology were studied. The results show that the well types and well structure play a decisive role on the efficiently and economically developing CBM. U-type wells and L-type wells are the most valuable for extension and application among all well types. The optimization of horizontal well structure should maintain smoothing of horizontal borehole, horizontal borehole down-dip of U-type wells, horizontal borehole up-dip and setting pocket for sinking coal powder of L-type wells. The completion method is selected according to the data of ground stress, the buried depth and permeability of coal-bed. The screen completion method should be adopted for lower ground stress, relatively shallow buried depth and high-permeable coal-bed. Otherwise, The technology of “casing cementing + segmented dense multi-cluster perforation + large-scale fracturing” should be adopted in the horizontal borehole. The drainage equipment combined “Rod pump + pumping unit ” should be selected in preference. The intelligent drainage and fine drainage should be implemented to strictly control the drainage rate of the stepwise up-production stage and stable production stage of coalbed methane, in order to ensure the sustainable high production of coalbed methane wells.
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