首页 | 本学科首页   官方微博 | 高级检索  
     检索      

煤岩对压裂裂缝长期导流能力影响的实验研究
引用本文:张士诚,牟善波,张劲,王雷.煤岩对压裂裂缝长期导流能力影响的实验研究[J].地质学报,2008,82(10):1444-1449.
作者姓名:张士诚  牟善波  张劲  王雷
作者单位:中国石油大学石油工程教育部重点实验室,北京,102249
基金项目:国家重点基础研究发展规划“973”项目“中国煤层气成藏机制及经济开采基础研究”(编号2002CB117009)和中国石油2006年风险基金(石油大学02)资助成果
摘    要:煤层中一般都伴有煤层气,通过压裂可以将煤层气释放出来,一方面能够获得清洁能源,另一方面可以提高煤田的安全开采。煤岩层自身特点决定了其在压裂中应用的实验评价方法及结论应具有特殊性,本文主要针对煤层气井的煤岩层压裂裂缝长期导流能力进行实验评价研究。实验表明,与砂岩地层不同,煤岩的硬度较小,压裂中支撑剂嵌入情况较严重;煤岩易破碎,碎屑颗粒充填到支撑剂中;同时支撑剂存在破碎及吸附伤害等,多种作用导致支撑裂缝的导流能力降低。实验中,以煤岩层闭合压力为一个重要的参数,实验对比分析了在不同闭合压力下,铺砂浓度、支撑剂粒径、支撑剂种类及组合的选择、支撑剂颗粒的破碎与嵌入、压裂液残渣等因素对煤岩层导流能力的影响。本文的实验结论为,嵌入对煤岩层支撑裂缝的导流能力伤害很大,加大铺砂浓度、采用低破碎率支撑剂、降低压裂液伤害能在一定程度上提高煤层裂缝的导流能力,但影响程度随闭合压力的增加而逐渐降低。本文所得出的结论对今后煤层气的开发及设计施工具有一定的指导意义。

关 键 词:煤岩  压裂  支撑剂  导流实验  导流能力
收稿时间:5/7/2008 12:00:00 AM
修稿时间:2008/9/18 0:00:00

Experimental Evaluation of Long term Conductivity of Fracturing in Coal Beds
ZHANG Shicheng,MOU Shanbo,ZHANG Jin and WANG Lei.Experimental Evaluation of Long term Conductivity of Fracturing in Coal Beds[J].Acta Geologica Sinica,2008,82(10):1444-1449.
Authors:ZHANG Shicheng  MOU Shanbo  ZHANG Jin and WANG Lei
Institution:MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing, 102249;MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing, 102249;MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing, 102249;MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing, 102249
Abstract:Coalbed methane(CBM) occurring in almost all coal beds can be released through fracturing,which will not only provide a clean energy resources but enhance production safety in coal mining.The features of CBM determine adoption of experiment method and the particularity of final conclusion.This paper focuses on experimental evaluation of long-term conductivity of fracturing in coal beds.The results show that different from sandstone strata,coal beds are of low hardness and easily broken,and embedment of various fragments in fractures is very common.Fragmentation and adsorption of proppant in coal beds,along with other factors,result in decrease of conductivity of fractures.Because closure pressure of coal beds is an important parameter,the experiment contrastively analyzed the factors such as sand concentration,type,diameter and combination of proppant,fragmentation and embedment of proppant particles,and residue,and their effects on conductivity of fracturing under the condition of various closure pressures.It is concluded in this study that embedment does great harm to conductivity of fractures.Although increase of sand concentration and adoption of lowering proppant and closure pressure will to some extent improve conductivity of fractures in coal beds,their effects decrease with increasing of closure pressures.Therefore,this study is of some practical significance in gas exploitation and engineering design and construction.
Keywords:coal bed  fracturing  proppant  experiment  conductivity
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《地质学报》浏览原始摘要信息
点击此处可从《地质学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号