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高煤阶煤层气储层产气能力定量评价
王镜惠,王美冬,田锋,刘巨光,梁正中
0
(1.榆林学院化学与化工学院,陕西榆林719000;2.中国石油集团渤海钻探工程有限公司第三钻井分公司,天津300000;3.中国石油华北油田公司工程技术研究院,河北任丘062552)
摘要:
煤层气高产区有效预测对提高煤层气单井产量和开发效益具有重要意义,为了实现煤层气储层产气能力的定量评价,基于沁水盆地南部煤层气开发数据,通过理论和统计分析,定义了储层含气性指数、煤层甲烷解吸效率指数、气水产出效率指数和产气能力指数4个参数对煤层气储层产气能力进行评价。结果表明:煤层气井日产气量随储层含气性指数、煤层甲烷解吸效率指数、气水产出效率指数的增加而增加,但相关性相对较差;当储层含气性指数大于100 m·m3/t时,或煤层甲烷解吸效率指数大于0.04(MPa·d)-1时,或气水产出效率指数大于1 mD·MPa时,单井日产气量能够达到800 m3/d以上。产气能力指数为储层含气性指数、煤层甲烷解吸效率指数和气水产出效率指数的乘积,能够有效表征储层产气能力强弱,产气能力指数越大,煤层气井产量越高。当产气能力指数大于0.3和10 mD·m·m3(/ t·d)时,对应的单井日产气量分别大于800和1 500 m3/d。
关键词:  高煤阶  煤层气  储层评价  产气能力  定量评价  产气能力指数
DOI:10.13673/j.cnki.cn37-1359/te.2019.04.016
基金项目:陕西省自然科学基础研究计划“鄂尔多斯盆地东北部异常压力形成与页岩气富集机理研究”(2017JM4017)。
Quantitative evaluation of production capacity of high rank coalbed methane reservoir
WANG Jinghui,WANG Meidong,TIAN Feng,LIU Juguang,LIANG Zhengzhong
(1.School of Chemistry & Chemical Engineering,Yulin University,Yulin City,Shaanxi Province,719000,China;2.The Third Drilling Branch of CNPC Bohai Drilling Engineering Company Limited,Tianjin City,300000,China;3.Engineering Technology Research Institute,Huabei Oilfield Company of CNPC,Renqiu City,Hebei Province,062552,China)
Abstract:
The effective prediction of the high production zone of the coalbed methane(CBM)is important to improve the single well production and the development benefits. In order to quantitatively evaluate the production capacity of the CBM reservoir,the gas-bearing index,desorption efficiency index of CBM,gas-water production efficiency index and production capacity index were defined through theoretical and statistical analysis of the CBM development data in southern Qinshui Basin. Results show that the daily gas production rate increases with the increase of gas-bearing index,desorption efficiency index of CBM and gas-water production efficiency index,however the correlations is not obvious. The daily gas production rate can be higher than 800 m3/d when the gas-bearing index is higher than 100 m·m3/t,the desorption efficiency in? dex of CBM is higher than 0.04(MPa·d)-1,or the gas-water production efficiency index is higher than 1 mD·MPa. The gas-production capacity index is the product of the gas-bearing index,desorption efficiency index of CBM and the gas-water production efficiency index,and it can effectively characterize the production capacity of CBM reservoir. A higher gasproduction capacity index results in a higher daily gas production rate. When the gas-production capacity indexes are higher than 0.3 and 10 mD·m·m3(/ t·d),the daily gas production rates are higher than 800 and 1 500 m3/d,respectively.
Key words:  high-rank coal  coalbed methane  reservoir evaluation  gas production capacity  quantitative evaluation  gas production capacity index

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