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戴 宗,江 俊,李海龙,等. 海相稠油油藏高倍数水驱岩心润湿性实验及微观机理[J]. 科学技术与工程, 2019, 19(33): 157-163.
DAI Zong,JIANG Jun,LI Hai-long,et al.Research on Contact Angle Transformation and Mechanism of High-multiple Flooding Process of Different Oil-viscosity Reservoirs[J].Science Technology and Engineering,2019,19(33):157-163.
海相稠油油藏高倍数水驱岩心润湿性实验及微观机理
Research on Contact Angle Transformation and Mechanism of High-multiple Flooding Process of Different Oil-viscosity Reservoirs
投稿时间:2019-04-17  修订日期:2019-08-20
DOI:
中文关键词:  海相稠油油藏 高倍水驱实验 接触角 润湿性 分子模拟
英文关键词:Heavy-oil reservoirs high-multiple water flooding contact angle wettability dynamic simulation
基金项目:中国海洋石油总公司“十三五”科技重大项目
                 
作者单位
戴 宗 CNOOC China Limited Shenzhen Branch
江 俊 中国石油大学(北京)石油工程学院
李海龙 中海石油(中国)有限公司深圳分公司
曹仁义 中国石油大学(北京)石油工程学院
辛 晶 中国石油大学(北京)石油工程学院
罗东红 中海石油(中国)有限公司深圳分公司
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中文摘要:
      中国南海珠江口盆地海相砂岩强边底水稠油油藏,采用水平井、大液量和天然能量开发。由于水驱倍数高,储层经过强烈冲刷,储层润湿性发生改变,从而影响水驱渗流特征。目前关于高倍数水驱储层润湿性变化的研究集中于陆上稀油油藏,对于海相沉积的稠油油藏研究偏少,且微观机理解释不多。本文改进了常规润湿角实验规范和流程,首先利用不同黏度油样和地下岩样进行高倍数水驱实验,然后测定高倍数水驱后岩心润湿性,研究原油黏度和驱替速度对岩心润湿性变化影响。结合X-衍射定量分析、扫描电镜、稠油四组分含量测定实验结果和分子动力学模拟方法,从矿物成分变化和极性物质含量方面,分析了润湿性变化的微观机理。结果表明:原油黏度越大,高倍数水驱前油湿性越强,高倍数水驱后接触角变化的绝对值越大;当原油黏度为150mPa.s时润湿性改变的潜力最大;水驱过程岩心粘土矿物含量的变化和岩心表面油膜的破坏是润湿性转变的重要因素。该成果对海相稠油油藏提高采收率具有指导意义。
英文摘要:
      For strong edge-bottom water heavy oil reservoirs in Pearl River Mouth Basin of the South China Sea, its development methods are based on mostly horizontal wells, large liquid volumes and natural energy. The reservoirs are strongly washed, and most of these reservoirs have now entered high. water-cut period. This development method will inevitably change the wettability of the reservoir, and the wettability is an important factor affecting the development of the oilfield. Therefore, it is necessary to carry out the high-multiple water flooding process research. Thus, the conventional experimental procedures were improved, and high-power water flooding experiments were carried out using underground oil samples and underground cores. The contact angle was measured of different oil viscosity and flooding velocity before and after high-multiple water flooding. Different methods were used to analyze the microscopic mechanism of the change. The experimental results show that the oil viscosity affects the initial wettability of the core and the wettability after high-multiple water flooding, and the effect of high-multiple water flooding on different oil viscosity is different. The flooding velocity changes the wettability of the cores, although the impact is relatively small. The contact angle after core flooding at a higher displacement velocity is slightly smaller than the contact angle at a lower velocity, indicating that increasing the displacement velocity can make the core more water-wet to a certain extent.
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