未出现径向流的试井典型曲线及其分析方法

发布时间：2018-04-16 07:41

本文选题：早期试井解释 + 低渗透油气藏　；参考：《石油学报》2017年05期

【摘要】：低渗透、特低渗透油气藏经过长时间测试后会仍然不出现径向流响应,采用常规Gringarten-Bourdet复合图版难以有效地确定出地层参数。通过均质无限大试井模型短时渐近解,求解出无因次井筒储集系数和表皮因子复合参数与无因次时间、无因次井底压力的关系式(ζ函数)。利用无因次压力和ζ函数构造出新的早期试井解释图版,该图版能够降低早期试井数据分析的多解性。通过建立均质油藏达西流模型及考虑启动压力梯度的均质油藏非达西流模型,给出了这2种模型对应的早期新图版,并分析了新图版的典型特征和渐近性质。与已有的早期试井分析图版对比发现,新图版对均质模型及考虑启动压力梯度的均质模型参数变化响应更加敏感,能够更有效地降低早期试井解释的多解性。
[Abstract]:The radial flow response will still be absent after a long time test in low permeability and ultra-low permeability reservoirs. It is difficult to determine the formation parameters effectively by using conventional Gringarten-Bourdet composite chart.Based on the short-term asymptotic solution of homogeneous infinite well test model, the relationship between dimensionless wellbore reservoir coefficient and epidermal factor, dimensionless time and dimensionless bottom-hole pressure (味 function) is obtained.Using dimensionless pressure and 味 function, a new interpretation chart of early well test is constructed, which can reduce the multi-solution of early well test data analysis.By establishing Darcy flow model of homogeneous reservoir and non-Darcy flow model of homogeneous reservoir considering starting pressure gradient, the early new charts corresponding to these two models are given, and their typical characteristics and asymptotic properties are analyzed.It is found that the new chart is more sensitive to the response of the parameters of the homogeneous model and the homogenization model considering the starting pressure gradient, and can effectively reduce the multi-solvability of the early well test interpretation.
【作者单位】：西安石油大学石油工程学院;西部低渗—特低渗油藏开发与治理教育部工程研究中心;西安华线石油科技有限公司;
【基金】：陕西省教育厅重点实验室科研计划项目(13JS090)资助
【分类号】：TE353

【相似文献】