西峰油田长8储层微观孔隙结构非均质性与渗流机理实验

西峰油田长8储层微观孔隙结构非均质性与渗流机理实验

宋广寿^1,2，高辉¹，高静乐^1,2，孙卫¹，任国富³，齐银³，路勇⁴，田育红⁴

1.西北大学大陆动力学国家重点实验室/地质学系，西安 710069;2.中国石油长庆油田公司，西安 710021;3.中国石油长庆油田公司油气工艺技术研究院，西安 710021;4.中国石油长庆油田公司第三采油厂，银川 750006

收稿日期:2008-05-30 修回日期:1900-01-01 出版日期:2009-01-26 发布日期:2009-01-26
通讯作者: 宋广寿

Experimental of Microscopic Pore Structure Heterogeneity and Flow Mechanism of Chang 8 Reservoir in Xifeng Oil Field

SONG Guang-shou^1,2, GAO Hui¹, GAO Jing-le^1,2, SUN Wei¹,REN Guo-fu³, QI Yin³, LU Yong⁴, TIAN Yu-hong⁴

1.The State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi’an 710069,China;2.Changqing Oilfield Company,Petrochina,Xi’an 710021,China;3.Petroleum Technology Research Institute, Changqing Oilfeild Company,Petrochina, Xi’an 710021, China;4.No.3 Oil Production Plant, Changqing Oilfield Company, Petrochina, Yinchuan 750006, China

Received:2008-05-30 Revised:1900-01-01 Online:2009-01-26 Published:2009-01-26
Contact: SONG Guang-shou

摘要/Abstract

摘要： 为深入剖析超低渗储层微观孔隙结构非均质性对渗流机理的影响程度，选取鄂尔多斯盆地西峰油田长8储层有代表性的样品进行了真实砂岩微观模型水驱油和CT扫描水驱油驱替实验。通过真实砂岩微观模型水驱油实验发现，对于没有微裂缝存在的岩样，水驱油效果往往与渗透率成正比关系，而微裂缝的存在使得微观孔隙结构非均质性显得更加突出，渗流机理将完全改变，从而水驱油效果也表现出较大的差异。CT扫描水驱油驱替实验结果也表明，微裂缝的存在明显增加了孔喉微观非均质程度，使得水驱效果变差。而环压对具有双重孔隙介质储层的注水效果会产生较大影响。可见对于超低渗储层，微观孔隙结构非均质性是造成注入水波及效率不高、水驱油效果差的主要原因。

关键词: 微观孔隙结构非均质, 水驱油效率, 渗流机理, X-CT成像, 西峰油田

Abstract: Representative samples are selected from Chang 8 reservoir of Xifeng oil field of Ordos basin to develop water displacing oil of in-situ sandstone microscopic model and water displacing oil of CT scanning for analyzing the impact of microscopic pore structure on flow mechanism of ultra-low permeability reservoir. The experimental results of water displacing oil indicate the water displacement efficiency always presents direct ratio with permeability for the core samples without microcrack. However, the existence of microcrack increases the heterogeneity of microscopic pore structure，then the flow mechanism changes completely, and the water displacement efficiency differs. The laboratory findings of water displacing oil of CT scanning also demonstrate microcrack increases the microscopic heterogeneity of pore structure to some great extent, makes the water displacement effect worse. Casing pressure has major affection on water displacement efficiency of dual porous medium reservoir. It is obvious that the microscopic pore structure heterogeneity is the main reason to cause low sweep efficiency and worse water displacement effects for ultra low permeability reservoirs.

Key words: microscopic pore structure heterogeneity, water displacement efficiency, flow mechanism, X-CT imagery, Xifeng oil field

中图分类号:

P618.13

宋广寿，高辉，高静乐，孙卫，任国富，齐银，路勇，田育红. 西峰油田长8储层微观孔隙结构非均质性与渗流机理实验[J]. J4, 2009, 39(1): 53-0059.

SONG Guang-shou, GAO Hui, GAO Jing-le, SUN Wei,REN Guo-fu, QI Yin, LU Yong, TIAN Yu-hong. Experimental of Microscopic Pore Structure Heterogeneity and Flow Mechanism of Chang 8 Reservoir in Xifeng Oil Field[J]. J4, 2009, 39(1): 53-0059.

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