煤层气储层类型及配套钻井方案概述  

Different Drilling Scheme Producing Coalbed Methane Efficiently for Different Coal Reservoirs

作　　者：张洪[1] 何爱国 覃成锦[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]中国石油钻井工程技术研究院,北京100097

出　　处：《中外能源》2010年第11期50-52,共3页Sino-Global Energy

基　　金：国家重大专项36"煤层气钻井工程技术及装备研制"项目(编号:2008ZX05036-002)资助

摘　　要：根据渗透率、压力、含气量等参数,可将煤层气储层分为Ⅰ类储层(好储层)、Ⅱ类储层(中等储层)、Ⅲ类储层(差储层)3大类。其中,Ⅰ类储层又分为高压高渗厚层状储层、高压高渗多层储层、高压高渗富气储层、高压高渗低含水储层;Ⅱ类储层又分为高压中渗薄层状储层、低压高渗中等含气储层、低压高渗贫气储层;Ⅲ类储层又分为低压低渗薄层储层、低压低渗厚层储层、低压低渗多层储层、低压低渗高起伏储层、低压低渗高含水储层。对于不同类型的储层,若要保证较好的产能,需要采取配套的钻井方案:Ⅰ类储层物性较好,可采用直井压裂或低分支水平井;Ⅱ类储层物性中等,可以采用三分支水平井、四分支水平井或U型井;Ⅲ类储层物性差、非均质性强,可采用羽状多分支水平井或丛式井,储层非均质性越强,羽状井主分支数应该越多。According to the difference of important parameters such as permeability,reservoir pressure,gas content,coalbed methane can be divided into three types：type Ⅰ,type Ⅱ and type Ⅲ.Among them,type Ⅰ reservoirs may be divided into high-permeability and thick bed,high-permeability and multiple beds at high pressure,high-permeability and gas enrichment at high pressure,and high-permeability and low water cut at high pressure.Type Ⅱ reservoirs may be divided into middle-permeability and thin bed at high pressure,high permeability and medium gas bearing at low pressure,and high-permeability and dry gas at low pressure.Type Ⅲ may be divided into low-permeability and thin bed at low pressure,low-permeability and thick bed at low pressure,low-permeability and multiple bed at low pressure,low-permeability and high undulation bed at low pressure,and low-permeability and high water cut at low pressure.They are suitable for different drilling schemes for good productivity.The typeⅠ has good physical property,and it fits for vertical well and low-branch horizontal well.The type Ⅱ has middle physical property,and it fits for three and four branches horizontal well or U-type well.The type Ⅲ has bad physical property and strong heterogeneity and it fits for pinnate multi-branch horizontal well or cluster well（more branches when more severe heterogeneity）.

关 键 词：煤层气 定向井 U型井 钻井方案 煤储层 

分 类 号：TD84[矿业工程—煤矿开采]