煤层气完井方式和增产措施的优选分析

在借鉴国外煤层气开发的经验及分析国外工程技术特点的基础上，利用数值模拟方法，建立了基于渗透率量化分级的完井和增产措施优选准则。通过对数值模拟计算的累积产气量分析，将煤层分为低渗、中渗以及高渗3个类别，并依此选择相应最合适的完井增产方法。低渗煤层（＜0.5×10-15 m2）适合选用水平井或者多分支水平井完井；中渗煤层（0.5×10-15～10×10-15 m2）适合选用直井压裂的方式；高渗煤层（＞10×10-15 m2）适合选用洞穴和扩孔等完井方式。

The optimization of coal-bed methane completion and stimulation technologies

Based on the results of numerical simulations,a permeability based strategy was established in order to select completion and stimulation methods.As a result,all coal seams can be categorized into three groups,including low permeability seam,moderate permeability seam and high permeability seam.Multi lateral and horizontal wells can be best applied in low permeability seams,vertical well with hydraulic fractures can meet the need of moderate permeability seams,and cavity completion can be considered in high permeability seams.