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The effect of physical property change on the water flooding development in Changqing oilfield Jurassic low permeability reservoir

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Petroleum 2015年第4期1卷 300-306页

作者： Yangnan Shangguan Yongqiang Zhang Weiliang Xiong Research Institute of Exploration and Development Changqing Oilfield CompanyChina

Changqing old oilfield Jurassic reservoir's average calibration recovery is 24.7%,with geological reserves recovery of 16.6%,water cut of 65.2%.And most of Jurassic reservoirs are in the middle and later field life,part of them has entered the high water cut and high recovery *** water flooding way for improving oil recovery becomes more difficult,and new method has to be *** oilfield BS district is a typical representative,with high water cut of 90.8%,high recovery percent of 26.1%and low oil recovery rate of 0.25%.To explore the new way to improve oil recovery,the polymer and surfactant(SP for short)important pilot test has been *** low permeability reservoir indoor core data in high water cut stage and inspection well results indicate that the reservoir permeability,pore combination characteristics and pore type changed greatly after long-term water flooding *** changes bring more difficulties to the continue development,especially the high injection pressure,which can cause other problems for well pattern infilling and *** paper takes the high injection pressure problem of Maling BS district Jurassic reservoir for example,analyzes the physical property change law on the following aspects:the development mode in the past,core analysis,formation sensitivity,interstitial matter,well test interpretation results,in order to help to further effective development and provide important parameters for tertiary oil recovery technique for similar reservoirs and others.

关键词： Jurassic reservoir physical property change Water flooding Core analysis EOR Low permeability

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property changes of anchor grout calcined ginger nuts admixed with fly ash and quartz sand after accelerated ageing tests

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Journal of Central South University 2019年第11期26卷 3114-3125页

作者： ZHANG Jing-ke ZHANG Li-xiang ZHAO Lin-yi LIU Dun GUO Qing-lin PEI Qiang-qiang School of Civil Engineering and Mechanics Lanzhou UniversityLanzhou 730000China Key Laboratory of Mechanics on Disaster and Environment in Western China Ministry of EducationLanzhou 730000China National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites Dunhuang AcademyDunhuang 736200China

Calcined ginger nuts admixed by fly ash and quartz sand (CGN-(F+S)) has been validated to be basically compatible to earthen sites as an anchor grout. Accelerated ageing tests including water stability test, temperature and humidity cycling test, soundness test and alkali resistance test are conducted with the objective to further research the property changes of CGN-(F+S) grout. Density, surface hardness, water penetration capacity, water permeability capacity, soluble salt, scanning electron microscopy (SEM) images and energy dispersive spectrometry (EDS) spectrum of these samples have been tested after accelerated ageing tests. The results show that densities of samples decrease, surface hardness, water penetration capacity and water permeability capacity of samples increase generally. Besides, soluble salt analysis, SEM and EDS results well corroborate the changes. Based on the results it can be concluded that property changes are most serious after temperature and humidity cycling test, followed by water stability, soundness and alkali resistance test in sequence. But in general, CGN-(F+S) still has good durability.

关键词： CGN-(F+S) grout accelerated ageing tests physical property change chemical property change scanning electron microscopy energy dispersive spectrometry

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