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| 离心法和隔板法测量低渗透储层饱和度指数的对比 |
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韩学辉1,李峰弼1,戴蕾2,唐俊1,王雪亮3,王洪亮3,房涛3
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(1.中国石油大学地球科学与技术学院,山东青岛 266580;2.中国石油西部钻探工程有限公司钻井工程技术研究院,新疆克拉玛依834000;3.中国石油西部钻探工程有限公司测井公司,新疆克拉玛依 834000)
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| 摘要: |
| 为了开发低渗透储层饱和度指数测量方法,分别应用半渗透隔板法毛管压力-电阻率联测和离心法测量4种典型低渗透储层的饱和度指数n,对比分析饱和度指数测量结果的差异性和机制,结合储层饱和度测井评价考察方法的适应性。结果表明:对于2×10-3～4×10-3 μm2以上的低渗透岩心,两种方法均适用;当渗透率小于2×10-3～4×10-3 μm2时,由于存在毛管压力与电阻率不平衡和“蒸发”的影响,离心法的适应性变差,隔板法仍然适用,但适应性会受到隔板突破压力的限制;隔板法能够同时提供毛管压力曲线用于划分储层类型,并给出相应的饱和度指数,有助于应对低渗透储层的非均质性。 |
| 关键词: 低渗透 饱和度指数 隔板法 离心法 非均质性 |
| DOI：10.3969/j.issn.1673-5005.2014.06.007 |
| 分类号::P 618.13 |
| 基金项目:国家油气专项(2011ZX05009-003)；国家留学基金项目(201306455002) |
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| Comparison of saturation exponent of low permeability reservoir obtained by centrifuge method and porous plate method |
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HAN Xuehui1, LI Fengbi1, DAI Lei2, TANG Jun1, WANG Xueliang3, WANG Hongliang3, FANG Tao3
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.Drilling Engineering Institute, Western Drilling Engineering Company Limited, CNPC, Karamay 834000, China;3.Well Logging Company, Western Drilling Engineering Company Limited, CNPC, Karamay 834000, China)
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| Abstract: |
| In order to develop an experimental method for measuring saturation exponent, a porous plate method for capillary pressure-resistivity connection survey and a centrifuge method were used respectively to determine the saturation index for four low permeability reservoirs, and the differences in the measurements were compared accordingly. In addition, the different mechanism and applicability of these two methods were analyzed using the saturation measurements from well logs. The results show that the centrifuge method is not applicable when the permeability is lower than 2×10-3 μm2 to 4×10-3 μm2 because of the disequilibrium of capillary pressure and resistivity, as well as the effect of evaporation. However, the porous plate method is preferably applicable when the work pressure is not higher than the breakthrough pressure. The porous plate method can provide both saturation index and capillary pressure curve, which can be used to determine the reservoir type and its saturation index, thus can be applied to deal with heterogeneity in reservoirs. |
| Key words: low permeability saturation exponent porous plate method centrifuge method heterogeneity |
