贵州金沙县安洛煤矿仁和勘查区试井曲线分析

Well Curve Analyses of Renhe Exploration Zone of Anluo Coal Mine in Jinsha,Guizhou

本文以安洛煤矿仁和勘查区为研究区,以地质勘探资料、现场样品分析及实验室测试成果为基础,通过注入/压降现场测试,使用saphir软件做了相关试井解释分析,选用具有井筒储集效应+表皮效应+径向复合井的模型,数值模拟了26-4孔特征鲜明的4#、8#和13#煤层,浅析该区煤储层基本地层特征。分析发现:注入初期压力波动大,压降阶段出现"回吐"现象,分析认为这可能与地层(煤层)具有较强的塑性且地层渗透性较差有关。从双对数曲线的开口较大,半对数曲线呈"厂"字形的形态看,本井煤层存在一定程度的污染。半对数曲线斜率发生变化,导数曲线上翘,并非反应某种边界,而是由于超过注水时间造成的。在试井过程中,储层渗透率受煤层有效厚度、流体水粘度控制极为显著;孔隙度和综合压缩系数对除储层渗透率以外其它储层参数的控制作用较为明显;流体地层体积系数在实际工作中可以忽略。

In this paper,Renhe exploration Zone of Anluo coal mine is taken as the research area,on the basis of exploration information,field sample test and laboratory test,by injection / pressure- drop test,explained relative well test by Saphir software,choose the model of well bore accumulation effect,skin effect and radial composite well,simulated coal seam 4#,8#and 13#of 26- 4 pore,the basic stratum features are also studied. It shows：the pressure fluctuated wildly in the early injection stage,regurgitation appeared in the pressure- drop stage,it＇s thought to be concerned with strong plasticity of stratum and weak permeability. Because of the big opening of double logarithmic curve and the shape of semi logarithmic curve,there are some pollution in this coal seam. The variation of semi logarithmic curve and derivative is not reflection of some boundary but caused by overtime water injection. During the well test,it＇s obvious that the seam permeability is controlled by effective thickness and fluid viscosity,the control of porosity and comprehensible compression ratio for other seam is also obvious,vohlme ratio of fluid statum can be ignored in the active work.