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改性注入剂对改善特低渗储层渗流能力的实验研究及应用

郑可，徐怀民，陈建文   

  1. 1.中国石油大学北京 地球科学学院，北京 102249； 2.中国石油大学北京 油气资源与探测国家重点实验室，北京 102249； 3.中国石油长庆油田分公司超低渗透油藏研究中心，陕西 西安 710021
  • 收稿日期:2013-02-27 修回日期:2013-04-16 出版日期:2013-08-10 发布日期:2013-08-10
  • 通讯作者: 郑可zhengkelw@126.com. E-mail:zhengkelw@126.com.
  • 作者简介:郑可（1984-），男，湖北荆州人，博士研究生,主要从事油气田开发地质及油藏研究. E-mail:zhengkelw@126.com.
  • 基金资助:
    国家科技重大专项“复杂油气藏精细表征及剩余油分布预测”（编号:2011ZX05009-003）资助.

The Influence of Modified Injectant on Improvement of Percolation Ability in Super-low Permeability

ZHENG Ke,XU Huai-min,CHEN Jian-wen   

  1. 1.School of Geosciences,China University of Petroleum,Beijing 102249,China;2.State Key Laboratory ofPetroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China; 3.Research Center of Ultra-low Permeability Reservoir,Changqing Oilfield Company,PetroChina,Xi′an 710021,China
  • Received:2013-02-27 Revised:2013-04-16 Online:2013-08-10 Published:2013-08-10

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417

摘要：

在对砂质砾岩、细粉砂岩这2种不同岩性的典型特低渗储层共计28块岩心样品进行室内常规驱替实验、对比实验和铸体薄片浸泡实验的基础上，评价OR和DA这2种不同类型的改性注入剂对各岩样驱替相渗透率和驱油效率的改善情况，分析其改善渗流能力的机理，再对2类改性注入剂的注入浓度进行优选，最后进行现场试验。研究表明，改性注入剂OR在细粉砂岩类特低渗储层中适用性较好，改性注入剂DA在砂质砾岩类特低渗储层中适用性较好，2类改性注入剂均能不同程度的提高驱替相渗透率和驱油效率，并不同程度的降低油水界面张力。浸泡实验表明2类改性注入剂均能使样品孔隙内的填隙物发生溶蚀，改性注入剂DA和OR最合理的注入浓度分别为3 000mg/L和2 000mg/L。最后进行的现场试验表明改性注入剂能使单井注水压力平均下降2.76MPa，日注水量平均增加4.15m3，吸水状况也能得到改善，室内实验和现场应用都取得较好效果。

关键词: 改性注入剂, 特低渗储层, 驱替相渗透率, 驱油效率, 驱替压力

Abstract:

Based on indoor waterflooding results of 28 core samples from two super-low permeability reservoirs with different lithology of sandy gravels,fine siltstone and the results of conventional displacement experiment,and contrast test and immersion test using casting thin sections,the improvement of displacing phase permeability and displacement efficiency brought by modified injectant OR and DA in different rock samples was evaluated,the mechanism of percolation ability enhancement brought by modified injectant was analyzed,then the optimization of injection concentration of modified injectant was conducted and the better one went into field test.The study shows that OR is better suited with fine siltstone super-low permeability reservoirs,while DA is better suited with sandy gravels super-low permeability reservoirs.Both of them can improve the displacing phase permeability and displacement efficiency,while reduce oil-water interfacial tension to some extent.The immersion test shows that both modified injectants can corrode the interstitial material filling the rock pores,and the reasonable injection concentration of modified injectant OR and DA are 3 000mg/L and 2 000mg/L respectively.While the field test shows that modified injectants can actually reduce water injection pressure by 2.76MPa on average,increase the daily water-injection rate by 4m3 and the water-injection situation is also improved.Both indoor experiments and field tests show good results.

Key words: Modified injectant;Super-low permeability reservoirs, Displacing phase permeability, Displacement efficiency, Displacement pressure

中图分类号: 

  • TE348

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