| 电缆地层测试最小测试时间的确定 |
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| 引用本文： | 胡法龙,肖立志,张元中,毛志强.电缆地层测试最小测试时间的确定[J].地球物理学进展,2006,21(4):1221-1226. |
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| 作者姓名： | 胡法龙 肖立志 张元中 毛志强 |
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| 作者单位： | 中国石油大学资源与信息学院，北京 102249 |
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| 基金项目： | 中国石油天然气集团公司资助项目 |
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| 摘 要： | 电缆地层测试器是重要的地层评价仪器，可以测量地层压力和渗透率、识别流体类型、确定油水界面.然而在低孔低渗地层中，由于泥饼的封闭性差而造成的地层增压现象，致使无法测量到地层真实压力.同时由于长时间的测试，容易将仪器卡在地层中而造成事故.本文提出一种确定电缆地层测试最小测试时间的方法.利用有限元方法计算泥饼和原状地层中的压力分布情况，求取泥浆柱静压力的影响半径，继而确定储层的最小测试时间，并且针对渗透性不同的储层给出了最小测试时间的范围.电缆地层测试最小测试时间的确定，可以确保电缆地层测试器在低孔低渗储层中测量到地层的真实信息，减小由于测量时间过长而引起工程事故发生率.
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| 关 键 词： | 电缆地层测试 最小测试时间 有限元 低孔低渗储层 |
| 文章编号： | 1004-2903（2006）04-1221-06 |
| 收稿时间： | 2005-11-10 |
| 修稿时间： | 2006-02-20 |
The minimum testing time determination for wireline formation tester |
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| HU Fa-long,XIAO Li-zhi,ZHANG Yuan-zhong,MAO Zhi-qiang.The minimum testing time determination for wireline formation tester[J].Progress in Geophysics,2006,21(4):1221-1226. |
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| Authors: | HU Fa-long XIAO Li-zhi ZHANG Yuan-zhong MAO Zhi-qiang |
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| Institution: | Faculty of Resource and information Technology, China University of petroleum, Beijing 102249,China |
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| Abstract: | The wireline formation tester(WFT) is an important tool for formation evaluation,such as calculating formation pressure and permeability,identifying fluid type,and determining the interface between oil and water.However,in a low porosity and low permeability formation,the supercharge pressure effect exists,since the mudcake has a poor sealing ability.The mudcake cannot isolate the hydrostatic pressure of the formation around the borehole and the mud seeps into the formation,leading to inaccurate formation pressure measurement.This paper presents a method for determining the minimum testing time for the wireline formation tester.The pressure distribution of the mudcake and the formation were respectively calculated with the finite-element method.The radius of influence of the mud pressure was also computed,and the minimum testing time in low porosity and low permeability formation was determined within a range of different formation permeabilities.The determination of minimum testing time ensures an accurate formation data in low porosity /low permeability formation and minimizes possible accident due to long waiting and testing time. |
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| Keywords: | wireline formation test the minimum testing time finite-element method low porosity and low permeability formation |
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