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纳米流体提高采收率机理研究现状

特种油气藏 2024年第3期31卷 1-10页

作者：郝龙侯吉瑞梁拓闻宇晨屈鸣中国石油大学(北京) 北京102249 西安石油大学陕西西安213164 东北石油大学三亚海洋油气研究院海南三亚572024

与传统的表面活性剂和聚合物溶液相比,纳米流体驱油是一项新的提高采收率技术,但目前机理研究成果较为分散,缺少系统性。因此,结合国内外纳米流体研究情况,总结纳米流体主要提高采收率机理,指出了纳米流体目前所面临的研究难点,展望了... 详细信息

与传统的表面活性剂和聚合物溶液相比,纳米流体驱油是一项新的提高采收率技术,但目前机理研究成果较为分散,缺少系统性。因此,结合国内外纳米流体研究情况,总结纳米流体主要提高采收率机理,指出了纳米流体目前所面临的研究难点,展望了纳米材料在今后的攻关方向。研究表明:纳米流体提高采收率机理包括降低油水界面张力,在油水固三相区形成楔形膜,产生结构分离压力,改善流度比扩大波及体积,改变岩石润湿性,增强泡沫稳定性,降低注入压力和选择性调堵孔道;今后可从提高纳米流体稳定性、降低纳米流体成本、提高采收率机理协同性研究以及开发高效纳米驱油体系等方面进行深入探索。该研究为大规模推广纳米流体在提高采收率方面的应用提供了理论基础和实验依据。

关键词：纳米流体提高采收率界面张力结构分离压力润湿性

Feasibility of Gas Drive in Fang-48 Fault Block Oil Reservoir

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Petroleum Science 2007年第3期4卷 51-56页

作者： Cui Lining hou jirui Yin Xiangwen Key Laboratory of Petroleum Engineering under Ministry of Education China University of Petroleum Beijing 102249 China Enhanced Oil Recovery Center China University of Petroleum Beijing 102249 China

The Fang-48 fault block oil reservoir is an extremely low permeability reservoir, and it is difficult to produce such a reservoir by waterflooding. Laboratory analysis of reservoir oil shows that the minimum miscibility pressure for CO2 drive in Fang-48 fault block oil reservoir is 29 MPa, lower than the formation fracture pressure of 34 MPa, so the displacement mechanism is miscible drive. The threshold pressure gradient for gas injection is less than that for waterflooding, and the recovery by gas drive is higher than waterflooding. Furthermore, the threshold pressure gradient for carbon dioxide injection is smaller than that for hydrocarbon gas, and the oil recovery by carbon dioxide drive is higher than that by hydrocarbon gas displacement, so carbon dioxide drive is recommended for the development of the Fang-48 fault block oil reservoir.

关键词： Low permeability reservoir gas drive feasibility laboratory analysis numerical simulation

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负电性高效聚合物降解剂研究及矿场先导试验

特种油气藏 2024年第3期31卷 167-174页

作者：闻宇晨侯吉瑞娄泽洋潘以诺屈鸣中国石油大学(北京)提高采收率研究院北京102249 中国石油青海油田分公司青海海西816400 东北石油大学三亚海洋油气研究院海南三亚572024

针对聚合物驱过程中长期注聚合物导致的聚合物堵塞问题,研发了一种负电性高效聚合物降解剂。采用电子显微镜、Zeta电位仪和多重光散射仪等仪器,研究了降解剂的微观形貌特征、体系稳定性、降解性能和降黏性能,评价了降解剂在多孔介质中... 详细信息

针对聚合物驱过程中长期注聚合物导致的聚合物堵塞问题,研发了一种负电性高效聚合物降解剂。采用电子显微镜、Zeta电位仪和多重光散射仪等仪器,研究了降解剂的微观形貌特征、体系稳定性、降解性能和降黏性能,评价了降解剂在多孔介质中的动态降解效果。结果表明:降解剂的最佳用量为质量分数为1.0%,该用量下聚合物降黏率和降解率均能达到95%以上,对聚合物及聚合物胶团的降解能力强,解堵效果明显。该降解剂腐蚀性弱,对井筒和管道损害小。在锦州9-3油田W4-4井开展了注聚合物井解堵矿场试验,验证了负电性高效聚合物降解剂的矿场解堵效果。该聚合物降解剂能够为聚合物驱高效开发提供技术支持。

关键词：聚合物驱聚合物降解剂堵塞降黏率降解率提高采收率

Study on the Variation Rule of Produced Oil Components during CO_(2) Flooding in Low Permeability Reservoirs

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Computer Modeling in Engineering & Sciences 2020年第6期123卷 1223-1246页

作者： Ganggang hou Tongjing Liu Xinyu Yuan jirui hou Pengxiang Diwu Unconventional Petroleum Research Institute China University of PetroleumBeijingChina College of Science China University of PetroleumBeijingChina

CO_(2) flooding has been widely studied and applied to improve oil recovery from low permeability *** the experimental results and the oilfield production data indicate that produced oil components(POC)will vary during CO_(2) flooding in low permeability ***,the present researches fail to explain the variation reason and *** this study,the physical model of the POC variation during CO_(2) flooding in low permeability reservoir was established,and the variation reason and rule were *** verify the correctness of the physical model,the interaction rule of the oil-CO_(2) system was studied by related *** numerical model,including 34 components,was established based on the precise experiments matching,and simulated the POC variation during CO_(2) flooding in low permeability reservoir at different inter-well reservoir *** POC monitoring data of the CO_(2) flooding pilot test area in northeastern China were analyzed,and the POC variation rule during the oilfield production was *** research results indicated that the existence of the inter-well channeling-path and the permeability difference between matrix and channeling-path are the main reasons for the POC variation during CO_(2) flooding in low permeability *** POC variation rules are not the same at different inter-well reservoir *** the low permeability reservoirs with homogeneous inter-well reservoir,the variation of the light hydrocarbon content in POC increases initially followed by a decrease,while the variation of the heavy hydrocarbon content in POC is completely *** carbon number of the most abundant component in POC will gradually *** the low permeability reservoirs with the channeling-path existing in the inter-well reservoir,the variation rule of the light hydrocarbon content in POC is increase-decrease-increase-decrease,while the variation rule of the heavy hydrocarbon content in POC is co

关键词： Low permeability reservoir CO_(2)flooding produced oil component inter-well reservoirs characteristic

Experimental investigation on flow characteristics of deionized water in microtubes

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Chinese Science Bulletin 2007年第6期52卷 849-854页

作者： XU ShaoLiang YUE XiangAn hou jirui Enhanced Oil Recovery Research Center China University of Petroleum Beijing 102249 China

The flow characteristics of deionized water in microtubes with diameters ranging from 2 to 30 μm are investigated. The experimental results show that the flow characteristics in microtubes with diameters of 16 μm and larger ones are in agreement with the classical theory. However, as the diameters are de-creased to 5 and 2 μm, the nonlinear flow characteristics prevail and the results indicate significant departure of flow characteristics from the predictions of the conventional theory, and the smaller the diameters, the larger the departure. As the Reynolds number increases, the degree of nonlinear flow characteristics decrease gradually and the experimental results are approximately equal to the theo-retical expectation. The minimum Reynolds number in this study is only 2.46×10^(-5).

关键词：微管脱离子水流动特性实验研究边界层流体

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微观剩余油分布及提高采收率评价方法

油田化学 2024年第2期41卷 356-366页

作者：杨忠全程婷婷罗陶涛李俊严文德侯吉瑞重庆科技学院石油与天然气工程学院重庆401331 复杂油气田勘探开发重庆市重点实验室重庆401331 中国石油大学(北京)非常规科学技术研究院北京102249

随着常规油藏进入高采出程度和高含水“双高”阶段,剩余储量可动用性变差,稳油增产难度日益增加。为长期挖潜油藏剩余油,加强剩余油分布赋存状态及表征,全面了解剩余油分布规律成为提高原油采收率的必要前提。通过梳理国内外针对不同油... 详细信息

随着常规油藏进入高采出程度和高含水“双高”阶段,剩余储量可动用性变差,稳油增产难度日益增加。为长期挖潜油藏剩余油,加强剩余油分布赋存状态及表征,全面了解剩余油分布规律成为提高原油采收率的必要前提。通过梳理国内外针对不同油藏开展的岩心分析、一维岩心驱油、微观驱油实验,并结合激光共聚焦、核磁共振成像、CT扫描成像、荧光分析等技术,从定性到定量对一到三维微观剩余油分布研究方法进行全面总结。结果表明,含油薄片分析因高保留残余油分布状态、能真实反映残余油原貌特征且技术成熟成为研究残余油分布的基本实验方法;传统岩心驱油模型是研究剩余油分布规律及提高采收率机理必不可少的实验方法,可反映真实储层情况,但只能从宏观视角分析不同因素对渗透效果的影响;真实岩心可视化模型可有效弥补传统岩心驱油模型的不足,但可视化实验装置耐高温高压有限,制作成本较高,图像处理不太清晰;微流控模型作为新兴技术,参数可控、实验重复性高,同时可将各种驱油模式下的微驱过程、流体的流动情况进行可视化展示,为评价驱油效果提供一条新途径,但简化的微观多孔模型与实际驱替实验结果仍存在一定差距。以核磁共振成像技术、X射线CT成像技术为主的成像分析技术凭借各自优势与真实岩心实验相结合,成为从微观角度有效描述剩余油分布特征的重要方法。该综述将为了解现有剩余油研究方法提供重要借鉴,为不同类型储层进行剩余油分布、高效开发、提高原油采收率等研究提供理论支撑。

关键词：剩余油分布评价方法室内实验微观提高采收率综述

Profile improvement during CO_2 flooding in ultra-low permeability reservoirs

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Petroleum Science 2014年第2期11卷 279-286页

作者： Zhao Fenglan Zhang Lei hou jirui Cao Shujun Research Institute of Enhanced Oil Recovery China University of Petroleum Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Petroleum Engineering Ministry of Education

Gas flooding such as CO2 flooding may be effectively applied to ultra-low permeability reservoirs, but gas channeling is inevitable due to low viscosity and high mobility of gas and formation heterogeneity. In order to mitigate or prevent gas channeling, ethylenediamine is chosen for permeability profile control. The reaction mechanism of ethylenediamine with CO2, injection performance, swept volume, and enhanced oil recovery were systematically evaluated. The reaction product of ethylenediamine and CO2 was a white solid or a light yellow viscous liquid, which would mitigate or prevent gas channeling. Also, ethylenediamine could be easily injected into ultra-low permeability cores at high temperature with protective ethanol slugs. The core was swept by injection of 0.3 PV ethylenediamine. Oil displacement tests performed on heterogeneous models with closed fractures, oil recovery was significantly enhanced with injection of ethylenediamine. Experimental results showed that using ethylenediamine to plug high permeability layers would provide a new research idea for the gas injection in fractured, heterogeneous and ultra-low permeability reservoirs. This technology has the potential to be widely applied in oilfields.

关键词： Ethylenediamine organic amine profile improvement ultra-low permeability reservoirs,mitigation of gas channeling CO2 flooding

基于3D打印和纳米黑卡技术提高缝洞型碳酸盐岩储层采收率

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油田化学 2024年第3期41卷 465-473页

作者：张炜侯吉瑞屈鸣吴伟鹏梁拓孙海童潘以诺中国石油大学(北京)非常规油气科学技术研究院北京102249 中国石化西北油田分公司新疆乌鲁木齐830011 东北石油大学三亚海洋油气研究院海南三亚572019 西安石油大学石油工程学院陕西西安710065

为有效改善塔河油田缝洞型油藏因注水注气开发而导致产量逐年降低的问题,通过3D打印技术制作3种等比例缩小的三维可视化缝洞储集体物理模型,包括风化壳、断控岩溶、暗河储集体模型。通过透射显微镜和原子力显微镜表征了片状纳米黑卡的... 详细信息

为有效改善塔河油田缝洞型油藏因注水注气开发而导致产量逐年降低的问题,通过3D打印技术制作3种等比例缩小的三维可视化缝洞储集体物理模型,包括风化壳、断控岩溶、暗河储集体模型。通过透射显微镜和原子力显微镜表征了片状纳米黑卡的微观结构,研究了纳米黑卡的油水界面吸附性、润湿反转性及在3种物理模型中的驱油效果,结合矿场实际情况选取两类典型结构单元井组开展井间驱替和单井替油矿场先导试验。结果表明,纳米黑卡的平均尺寸约为80×60×1.2(nm),比表面积大;具有良好的两亲性,可在油/水界面形成稳定的吸附层;具有良好的润湿反转性,可将石英片表面由油湿改变为水湿。在风化壳、暗河、断控岩溶三维模型中,纳米黑卡驱可在水驱基础上分别提高原油采收率11百分点、8百分点、7百分点,风化壳储集体受益效果最明显。15轮次矿场试验结果表明,纳米黑卡驱油不适用于3种岩溶储集空间的单井替油开采方式;风化壳暗河岩溶储集空间构成的井组具有良好的井间联通性和较高的受效程度,为最佳矿场应用选择区域。矿场受效率高达85.7%,且增油量显著,累计增油约5000吨。研究结果为塔河油田缝洞型油藏后续开展纳米黑卡驱油技术提供现场指导理论依据。

关键词：缝洞型油藏纳米黑卡提高采收率风化壳暗河断控岩溶

Stochastic and upscaled analytical modeling of fines migration in porous media induced by low-salinity water injection

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Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 491-506页

作者： Yulong YANG Weifeng YUAN jirui hou Zhenjiang YOU Jun LI Yang LIU Unconventional Petroleum Research Institute China University of PetroleumBeijing 102249China School of Chemical Engineering The University of QueenslandBrisbane QLD 4072Australia College of Petroleum Engineering China University of PetroleumBeijing 102249China

Fines migration induced by injection of low-salinity water(LSW) into porous media can lead to severe pore plugging and consequent permeability reduction. The deepbed filtration(DBF) theory is used to model the aforementioned phenomenon, which allows us to predict the effluent concentration history and the distribution profile of entrapped particles. However, the previous models fail to consider the movement of the waterflood front. In this study, we derive a stochastic model for fines migration during LSW flooding, in which the Rankine-Hugoniot condition is used to calculate the concentration of detached particles behind and ahead of the moving water front. A downscaling procedure is developed to determine the evolution of pore-size distribution from the exact solution of a large-scale equation system. To validate the proposed model,the obtained exact solutions are used to treat the laboratory data of LSW flooding in artificial soil-packed columns. The tuning results show that the proposed model yields a considerably higher value of the coefficient of determination, compared with the previous models, indicating that the new model can successfully capture the effect of the moving water front on fines migration and precisely match the effluent history of the detached particles.

关键词： low-salinity water(LSW)flooding fines migration stochastic model downscaling porous media waterflooding front exact solution