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煤层气储层类型及配套钻井方案概述 预览 被引量:9

Different Drilling Scheme Producing Coalbed Methane Efficiently for Different Coal Reservoirs
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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).
作者 张洪 何爱国 覃成锦 Zhang Hong1,He Aiguo2,Qin Chengjin1(1.Key Laboratory of Petroleum Engineering of Education Ministry,China University of Petroleum,Beijing 102249;2.CNPC Drilling Technology Institute,Beijing 100097)
出处 《中外能源》 CAS 2010年第11期 50-52,共3页 China Foreigh 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
关键词 煤层气 定向井 U型井 钻井方案 煤储层 coalbed methane controlled directional well U-type well drilling scheme coal reservoir
作者简介 张洪,2002年获中国地质大学(北京)能源系博士学位.目前主要从事储层及油气成藏等方面的研究工作。E-mail:zhang_ho_2002@sina.com
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