一种新的井筒积液气井试井分析方法  

A NEW WELL TEST ANALYSIS TECHNIQUE FOR GAS WELLS WITH LIQUID YIELD EFFECTS

作　　者：林加恩[1] 梁继德[2] 张奇斌[2] 杨慧珠[1] 

机构地区：[1]清华大学力学系 [2]中国石油大庆油田测试技术服务分公司

出　　处：《天然气工业》2006年第12期118-120,共3页Natural Gas Industry

摘　　要：气井早期段压力恢复曲线容易受到关井后井筒积液因素的影响,从而导致早期试井曲线出现各种异常的形状。对于这类测试资料,用常规的定井储模型方法无法进行有效地典型曲线拟合分析解释,并且应用Fair或Hegeman相分离解释模型也不能完全地解释积液过程产生的变井筒储存效应。此外,许多情况下的积液效应对压力恢复曲线响应的影响,无法应用常规的压力及压力导数双对数图诊断出。文章首先系统地研究了各种情况下的变井储响应诊断方法,说明了应用PPD诊断图和SLPD诊断图诊断变井储响应的有效性;其次,研究了Spivey和Lee提出的变井筒储存模型,在此基础上通过引入标准化拟压力和拟时间函数建立了一套基于分隔泄漏变井储模型的井筒积液气井试井分析理论与方法,并应用实例说明了该方法的可靠性。The early parts of pressure buildup response for gas well are easily affected by liquid accumulation after shut in. Well bore storage effects such as 'Hump' phenomena, which are more likely, tend to produce the abnormal pressure buildup curves. Conventional well reserve model is no good for typical curve matching analysis of this type of well test data nor is Fair or Hegeman phase separation model efficient in explaining variable well bore storage in the process of liquid yield. Moreover, the impact of liquid yield effect on pressure buildup curve under many circumstances can't be diagnosed with conventional pressure & pressure differential log-log graph. This paper systematically presents the research on diagnosis method for variable well bore storage under different conditions and demonstrates the effectiveness of PPD and SLPD graph in diagnosis. Then the paper presents variable well bore storage model established by Sprivey and Lee and outlines the well test analysis theory and methods for gas wells with liquid yield effects based on 'leaky packer' variable wellbore storage model developed by introducing normalized pseudo-pressure and normalized pseudo-time. A field example is demonstrated to verify the reliability of the new method.

关 键 词：气井试井 井眼 液体滞留 储存系数 压力恢复分析 

分 类 号：TE353[石油与天然气工程—油气田开发工程]