考虑气体滑脱效应的低渗透气藏试井典型曲线  

TYPICAL CURVES OF WELL TESTING FOR LOW-PERMEABILITY GAS RESERVOIRS CONSIDERING GAS SLIPPAGE EFFECT

作　　者：李彦尊[1] 程时清[1] 袁玉金[1] 杨天龙[1] 

机构地区：[1]中国石油大学教育部石油工程重点实验室,北京102249

出　　处：《大庆石油地质与开发》2009年第4期72-75,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：基金项目：国家“863”项目“特殊结构井开发油藏工程技术”（合同编号2006AA092338）资助.

摘　　要：在低渗低压气藏渗流过程中，滑脱效应的影响非常明显。为此，引入滑脱因子参数，建立了考虑井筒储集和表皮效应的低渗透气藏试井数学模型，给出相应的有限差分解法，绘制了新的含滑脱压力参数的试井典型曲线图版。通过试井曲线分析表明，存在滑脱效应的试井导数曲线位于无滑脱效应的曲线的下方，相应的导数值变小，不同滑脱压力比径向流动期曲线基本平行，滑脱压力比越大，出现径向流的时间越早，压力导数越小。半对数曲线斜率变小，表明滑脱效应改善了气藏绝对渗透率，气井出现径向流的时间也变短。研制的图版为低渗透气藏试井解释提供了新的手段。Gas slippage effect has significant influences on the flow course of low - pressure and low-permeability gas reservoirs. For the reason mentioned above, gas slippage factors have been inducted in this essay, a mathematical model for well testing in low-permeability gas reservoirs has been set up considering wellbore storage and skin effects, the corresponding finite difference solution has been derived and the new charts of typical well testing curves that involve slippage pressure ratio have been generated. Well testing curves analysis indicates that the derivative curves of well testing with the existence of slippage effects locate under the curves without the occurring of slippage effect and tile relevant derivative decreases, the curves of different slippage ratios are approximately paral- lel during radical flow period and the larger the slippage ratio, the earlier radical flow occurs and the smaller the derivative will be. The reduction of slope of semi-log plot implies that gas slippage effect improves the absolute permeability of gas reservoirs and diminishes the time of radical flow in gas wells. The newly-generated charts are new approaches for well testing interpretation of the gas reservoirs.

关 键 词：低渗透气藏 滑脱效应 数学模型 数值解 试井 

分 类 号：TE353[石油与天然气工程—油气田开发工程]