煤田地质与勘探2016，Vol.44Issue(2)：29-33,5.DOI:10.3969/j.issn.1001-1986.2016.02.006
煤层气井排采初期井底流压动态模型及应用分析
Dynamic model for bottomhole flowing pressure in initial stage of CBM wells drainage and its application
摘要
Abstract
Bottomhole flowing pressure is one of the key parameters that affect gas production of coalbed methane (CBM) wells, how to control the change of the bottomhole flowing pressure to increase the gas production of coalbed methane well is a problem worth considering. Based on the radial seepage theory, two dynamic prediction models are established, one is under the condition of infinite outer boundary with inner boundary of regular pro-duction and the other is non-regular production, and the change law of the bottomhole flowing pressure is finally revealed under the condition of regular production and non-regular production in the early stage of the drainage. Results show that the flowing bottomhole pressure reduces with the drainage time by the negative logarithm law under the condition of regular production and the flowing bottomhole pressure reduces with the displacement by the negative linear law in the condition of non-regular production. The prediction and analysis of the prediction model were applied in 6 CBM wells of Shizhuangnan block in the early stage of the drainage. It turns out that the predicted result fits the actual situation well.关键词
煤层气井/排采初期/井底流压/动态模型Key words
coalbed methane well/initial drainage/bottomhole flowing pressure/dynamic model分类
天文与地球科学引用本文复制引用
张永平,孟召平,刘贺,杨延辉..煤层气井排采初期井底流压动态模型及应用分析[J].煤田地质与勘探,2016,44(2):29-33,5.基金项目
国家自然科学基金项目(41372163，41172145)；国家科技重大专项项目(2011ZX05061)；中国石油天然气股份有限公司重大科技专项项目(2013E-2205)；2014年度山西省煤基重点科技攻关项目(MQ2014-01， MQ2014-12)；山西省煤层气联合研究基金资助项目(2014012001) （41372163，41172145）
