【作者】 袁文峰；

【导师】 赵峰华；

【作者基本信息】 中国矿业大学（北京） ， 矿产普查与勘探， 2014， 博士

【摘要】 本论文以沁水盆地南部煤层气田为研究区，以大量煤层气井生产动态监测数据为基础，采用煤层气地质学、数值模拟的理论和方法，研究了沁水盆地南部煤层气的富集规律、煤层气井产气曲线特征、煤层气井产能差异、煤层气井动态采收率、煤层气井排采影响因素、排采预警参数，得出如下结论：（1）沁水盆地南部煤层气保存条件较好，煤层气富集类型属于构造与地下水耦合控制型；煤层含气量10-24m3/t，含气饱和度60%-90%；煤储层的渗透率较高，但对煤层气的吸附能力强，煤层气井临界解吸压力高，临界解吸压力与储层压力比值高。（2）沁水盆地南部煤层气井产气曲线特征揭示了煤层气排采压降漏斗的形成及扩展规律，煤层气井产气曲线特征表现为产气峰值出现时间早、持续时间长的特点，煤层气单井产量基本可以稳定在2000m3/d。（3）将沁水盆地南部煤层气井产气类型划分为平稳产气型、产量平稳升降型、产气波动急剧下降型、初期高产后期波动型、低产型五种类型。（4）提出了将井底压力波动与煤粉浓度作为煤层气排采的预警参数。井底压力波动预警指标：井底压力波动值在0.05MPa/d以下，对储层伤害较小；井底压力波动值为0.05MPa/d-0.1MPa/d，对储层产生一定伤害；井底压力波动值超过0.1MPa/d，对储层伤害大。煤粉浓度预警指标：生产井安全的煤粉浓度应小于1%；生产井存在卡泵危险的煤粉浓度为1%-3%；生产井卡泵危险性升高的煤粉浓度大于3%。更多还原

【Abstract】 In this paper, CBM geology, and numerical simulation are combined to research coalbedmethane enrichment regularity, characteristic of gas production wells curves, well productivitydifferences, wells dynamic recovery, well drainage factors, and gas warning parameters in thesouthern Qinshui basin coalbed methane field, which are based on plenty of CBM wells producedynamic monitoring data. The following conclusions:(1)southern Qinshui Basin CBM preserv-ation condition is better, coalbed methane enrichment type is constructed with groundwatercoupling control type.coalbed gas content is10-24m3/t,while gas saturation is60%-90%.coalreservoir permeability is higher, but the adsorption ability of CBM, CBM wells critical desorptionpressure and the critical desorption pressure and reservoir pressure ratio is high.(2) gas productioncurves of coalbed methane wells in southern Qinshui Basin reveals drop funnel formation andexpansion of the law of methane drainage and gas pressure.Gas production curves of coal bedmethane gas production wells showed the characteristics of earlier peak time and long duration andcoal gas well production can be basically stable at2000m3/d.(3) CBM well gas production type inthe southern Qinshui Basin is divided into five types such as smooth gas production type, steady lifting-type production, gas production declined sharply volatile type, the initial high yield andfluctuating late and low-yielding type.(4)fluctuation of the bottomhole pressure fluctuations andconcentration of coal bed methane drainage are made as early warning parameters. Bottomholepressure fluctuations warning indicators: bottomhole pressure fluctuation value is0.05MPa/d orless, which is less damage to the reservoir; bottomhole pressure fluctuations is0.05MPa/d-0.1MPa/d, have some damage to the reservoir; wells bottom pressure fluctuationexceeds0.1MPa/d, which is big damage to the reservoir. Warning indicators pulverized coalconcentration: concentration of pulverized coal in safety production wells should be less than1%;coal concentration production wells existing Card pump danger is1%to3%; and an increased riskof production wells pump block will arise when pulverized coal concentration is greater than3%.更多还原