基于流体注入诊断法的煤层气试井技术研究

摘要

为解决传统试井测试时间较长、数据分析不能得到唯一解等问题,分析和阐述了流体注入诊断法试井的基本原理、方法和数据解释,以沁水盆地东北缘参-1井现场试验为例,结合该井及其他区块6口井的注入压降法、历史拟合法与流体注入诊断法的测值进行了综合对比分析.研究结果表明:按同一口井同一煤层、同一钻进平台2口井同一煤层、邻近2口井同一煤层和同一区块2口井同一煤层的3种方法测定渗透率:流体注入诊断法渗透率值接近排采后期历史拟合值且均高于注入压降法测值,但3者数据处于同一数量级之内;注入压降法与流体注入诊断法2种方法测得储层压力数据相差不大;结合3种方法的测得参数值,流体注入诊断法测得参数反映了煤层气储层参数的特征.%In order to solve some problems of traditional test such as long test time in the traditional test well and multi-solutions of data analysis,Diagnostic Fracture Injection Test had been introduced.This article expounded the principle,method and data analysis of Diagnostic Fracture Injection Test Method.The Diagnostic Fracture Injection Test Method was applied to the tests for Well Can-1 in the Northeast of Qinshui Basin,and production well historical matching method,injection and pressure drop test results was applied to the comparison tests and analysis on the coal reservoir parameter for six wells in other blocks.The results showed that the permeability value of Diagnostic Fracture Injection Test Method was close to the value of the production historical matching and higher than the value of injection and pressure drop test,and the data of three methods were in the same order of magnitude,reservoir pressure was not different for the same coal in well,the same coal in the same wells bed,the same coal seam in block of two approach wells,the same coal seam and the same block two wells.Basically,parameters from Diagnostic Fracture Injection Test Method reflected the features of coalbed methane reservoir.