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阶跃测试是煤层气井获取原地应力数据的方法之一 ,并能为煤层注入 /压降测试提供准确合理的施式依据。阶跃测试是用一系列不断递增的稳定排量向地层注入流体 ,记录每一阶段的注入压力与排量 ,绘制稳定排量与压力关系曲线 ,当出现两条斜率不同的相交直线后 ,关井测压力降落曲线。压降期测试资料的分析采用双对数法和时间平方根法 ,以求取评价煤层压裂设计所需的参数———闭合压力
Step test is one of the methods to obtain in-situ stress data of coalbed methane wells, and can provide accurate and reasonable formula basis for coal injection / pressure drop test. The step test is to inject fluid into the formation with a series of increasing and steady discharges. Record the injection pressure and displacement at each stage, and plot the relationship between displacement and pressure. When there are two intersecting lines with different slopes, Wells measured pressure drop curve. Pressure drop test data analysis using double logarithm method and time square root method, in order to assess the parameters required to evaluate the design of coal fracturing - closed pressure