侯绪田, 赵向阳, 孟英峰, 杨顺辉, 李皋, 刘文臣. 基于真实裂缝试验装置的液液重力置换试验研究[J]. 石油钻探技术, 2018, 46(1): 30-36. DOI: 10.11911/syztjs.2018036
引用本文: 侯绪田, 赵向阳, 孟英峰, 杨顺辉, 李皋, 刘文臣. 基于真实裂缝试验装置的液液重力置换试验研究[J]. 石油钻探技术, 2018, 46(1): 30-36. DOI: 10.11911/syztjs.2018036
HOU Xutian, ZHAO Xiangyang, MENG Yingfeng, YANG Shunhui, LI Gao, LIU Wenchen. Liquid-Liquid Gravity Displacement Test Based on Experimental Apparatus for Real Fractures[J]. Petroleum Drilling Techniques, 2018, 46(1): 30-36. DOI: 10.11911/syztjs.2018036
Citation: HOU Xutian, ZHAO Xiangyang, MENG Yingfeng, YANG Shunhui, LI Gao, LIU Wenchen. Liquid-Liquid Gravity Displacement Test Based on Experimental Apparatus for Real Fractures[J]. Petroleum Drilling Techniques, 2018, 46(1): 30-36. DOI: 10.11911/syztjs.2018036

基于真实裂缝试验装置的液液重力置换试验研究

Liquid-Liquid Gravity Displacement Test Based on Experimental Apparatus for Real Fractures

  • 摘要: 为了解裂缝性地层发生液液置换过程中流体在裂缝中的真实流动形态,通过扫描现场实际露头裂缝,构建了真实的裂缝空间,根据裂缝性地层液液重力置换机理,利用可视化井筒-地层耦合流动试验装置进行了钻井液与模拟地层流体的可视化重力置换试验,分析了裂缝宽度、井口回压、钻井液密度、钻井液黏度和地层流体黏度对定容性地层液液置换量的影响规律,并根据量纲分析理论回归了置换量与各影响因素的关系。结果表明:裂缝宽度、井口回压和钻井液密度增大,置换速率和置换量均增大;钻井液和地层流体黏度升高,置换速率和置换量均减小;循环当量密度相同时,采用低密度钻井液加回压的方式,置换量较小。这表明,裂缝两端的压差是发生液液置换的主要原因,而钻井液与地层流体的密度差与黏度差是导致裂缝两端产生压差的主要因素。

     

    Abstract: In order to understand the actual flow pattern of fluids inside fractures during liquid-liquid displacement,visualized displacement tests for drilling fluid and simulated formation fluid were conducted with a visualized apparatus for wellbore-formation coupled flow based on the liquid-liquid gravity displacement mechanism of fractured formations.This apparatus could simulate real fracture space by reference to fractures scanned in field outcrops.The affecting rules of fracture width,wellhead back pressure,density of drilling fluid,viscosity of drilling fluid and viscosity of formation fluid on the liquid-liquid displacement amount in volume-constant formations were analyzed,and further the relationships among the displacement amount and all influential factors were regressed on the basis of the dimension analysis theory.The results indicated that with the increase of fracture width,wellhead back pressure and density of drilling fluid,the displacement rate and amount would be increased;while with the increase of viscosity of drilling fluid and formation fluid,the displacement rate and amount would be reduced;under the same equivalent circulating density,drilling fluids with lower density and back pressure could produce less displacement amount.These results suggest that the pressure difference between the two ends of fractures is the key reason for the displacement,which can be traced to the differences between drilling fluid and formation fluid in density and viscosity.The research results can provide guidance for the control of liquid-liquid gravity displacement in fractured formations.

     

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