摘要
注入/压降试井是目前煤层气井获取煤储层渗透率、储层压力及井筒参数的主要手段。一般情况下,关井阶段压力变化平稳,排量稳定,因此注入/压降试井报告中采用压降阶段的压力数据进行分析。但在一些低渗储层使用压降段曲线进行分析时,能表征储层重要特征的径向流段往往不能出现。注入测试的实质是一次负产量的压降试井,在排量稳定、压力曲线光滑的前提下,可以对注入曲线进行分析,求取储层参数,并以A井为例进行了分析说明,分析结果显示,注入曲线与压降曲线分析所得渗透率一致。
The injection/depressurization test well is primary means for CBM well coal reservoir permeability, reservoir pressure and shaft parameters acquisition at present. Normally, pressure changes smoothly and gas displacement stable during shut-in period. Thus,in injection/depressurization test well report adopts pressure data during depressurization stage to carry out analysis. But in some low permeability reservoirs, the radial flow sector that can characterize important features sometimes can not appear. The essential of injection test is a negative yield depressurization test well, under the precondition of stable displacement and smooth pressure curves, can analyze injection curves to obtain reservoir parameters. Taking the well A as an example, carried out analysis and the result has shown that all permeability data from injection curves and depressurization curves are in full accord.
出处
《中国煤炭地质》
2014年第11期31-33,38,共4页
Coal Geology of China
关键词
煤储层
注入/压降试井
注入段曲线
分析应用
coal reservoir
injection/depressurization test well
injection interval curve
analysis and application
