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Energy Geoscience 2024年第1期5卷 230-233页

作者： Li Zhang Haiying Liao maolei cui R&D Center of Sustainable Development of Continental Sandstone Mature Oilfield Beijing100083China Petroleum Exploration and Production Research Institute SinopecBeijing100083China

The dissolution and diffusion of CO_(2)in oil and water and its displacement mechanism were investigated by laboratory experiment and numerical simulation for Block 9 in the Tahe oilfield,a sandstone oil reservoir with strong bottom-water drive in Tarim Basin,Northwest *** parameters were analyzed as solubility ratio of CO_(2)in oil,gas and water,interfacial tension,in-situ oil viscosity distribution,remaining oil saturation distribution,and oil *** results show that CO_(2)flooding could control water coning and increase oil *** the early stage of the injection process,CO_(2)expanded vertically due to gravity differentiation,and extended laterally under the action of strong bottom water in the intermediate and late *** CO_(2)got enriched and extended at the oil-water interface,forming a high interfacial tension zone,which inhibited the coning of bottom water to some extent.A miscible region with low interfacial tension formed at the gas injection front,which reduced the in-situ oil viscosity by about 50%.The numerical simulation results show that enhanced oil recovery(EOR)is estimated at 5.72%and the oil exchange ratio of CO_(2)is 0.17 t/t.

关键词： Strong bottom-water drive reservoir CO_(2)flooding Enhanced oil recovery Coning of bottom water Tahe oilfield Tarim Basin Northwest China

Characteristics of water alternating CO_(2)injection in low-permeability beach-bar sand reservoirs

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Energy Geoscience 2024年第1期5卷 224-229页

作者： maolei cui Rui Wang Zengmin Lun Chengyuan Lv State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing100083China Key Laboratory of Marine Oil and Gas Reservoir Production SINOPECBeijing100083China Petroleum Exploration and Development Research Institute SINOPECBeijing100083China

Water flooding can be ineffective in highly heterogeneous low-permeability beach-bar sand *** introduction of CO_(2)flooding helps boost the oil production of the reservoirs but only in an early *** the late stage of flooding,gas channeling would *** alternating gas(CO_(2))(WAG)process can be used to delay gas channeling and improve the effect of CO_(2)injection,though its adaptability to beach-bar sand reservoirs remains *** order to clarify CO_(2)injection characteristics in these reservoirs,experiments were carried out in high-temperature high-pressure NMR on-line displacement experiment apparatus to simulate different flooding modes on synthetic cores that can reflect the vertical heterogeneity of beach-bar *** CO_(2)injection modes were implemented on these cores and the displacement characteristics and residual oil distribution features during both WAG injection and continuous CO_(2)injection were analyzed quantitatively and *** results show that the scheme of WAG injection after continuous CO_(2)injection can obtain better oil displacement efficiency than that of the scheme of continuous CO_(2)injection after WAG injection,but there is no significant difference in respect of oil displacement efficiency of WAG flooding between the mode of bar-injection e beach-production(injection into bar sand e production from beach sand)and the mode of beach-injection e beach-production(injection into and production from beach sand),with the former mode having a higher oil recovery *** wider pore-size distribution range of microscopic residual oil after WAG injection shows great potential of enhancing oil recovery from subsequent continuous gas *** WAG injection is implemented prior to continuous CO_(2)injection,the displacement effect of the latter is more *** research may provide a theoretical basis for CO_(2)EOR in this type of reservoirs.

关键词： Beach-bar sand Low permeability CO_(2)injection WAG NMR

A new model simulating the development of gas condensate reservoirs

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Energy Geoscience 2024年第1期5卷 239-248页

作者： Yang Yang Zengmin Lun Rui Wang maolei cui Wei Hu Petroleum Exploration and Production Research Institute SINOPECBeijing100083China

A new simulation model for the development of gas condensate reservoirs is introduced based on the influence that phase change,non-Darcy flow,and capillary pressure have on the production of gas *** model predicts well performance,including bottom-hole pressure,oil/gas production rate,oil/gas recovery,gaseoil ratio,and the change in produced fluid *** also calculates dynamic characters,such as the change of pressure field and oil/gas saturation field during the development of gas condensate *** model is applicable to different boundary conditions(both constant-pressure and sealed boundary)and different production modes(both constant-pressure and constant-volume production modes).Model validation attempted using numerical simulation results for sealed boundary conditions with constant-pressure production mode has shown a relatively good match,proving its *** constant-pressure boundary conditions with constant-volume production mode,four stages are defined according to the dynamic behavior of production performance in the development of gas condensate reservoirs.

关键词： Gas condensate reservoir Phase behavior Numerical simulation Pseudo-pressure method

Displacement characteristics of CO_(2)flooding in extra-high water-cut reservoirs

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Energy Geoscience 2024年第1期5卷 212-218页

作者： Rui Wang Yaxiong Zhang Chengyuan Lyu Zengmin Lun maolei cui Dongjiang Lang SINOPEC Petroleum Exploration and Production Research Institute BeijingChina

Carbon dioxide(CO_(2))flooding is a widely applied recovery method during the tertiary recovery of oil and gas.A high water saturation condition in reservoirs could induce a‘water shielding’phenomenon after the injection of CO_(2).This would prevent contact between the injected gas and the residual oil,restricting the development of the miscible zone.A micro-visual experiment of dead-end models,used to observe the effect of a film of water on the miscibility process,indicates that CO_(2)can penetrate the water film and come into contact with the residual oil,although the mixing is significantly ***,the dissolution loss of CO_(2)at high water-cut conditions is not *** oil-water partition coefficient,defined as the ratio of CO_(2)solubility in an oil-brine/two-phase system,keeps constant for specific reservoir conditions and changes little with an injection *** NMR device shows that when CO_(2)flooding follows water flooding,the residual oil decreasesdnot only in medium and large pores but also in small and micro *** levels of higher water saturation,CO_(2)displacement is characterized initially by a low oil production rate and high *** the CO_(2)breakthrough,the water-cut decreases sharply and the oil production rate increases *** response time of CO_(2)flooding at high watercut reservoirs is typically delayed and *** results were confirmed in a pilot test for CO_(2)flooding at the P1-1 well group of the Pucheng *** from this pilot study also suggest that a larger injection gas pore volume available for CO_(2)injection is required to offset the dissolution loss in high water saturation conditions.

关键词： Displacement characteristics CO_(2)flooding Water shield phenomenon Oil-water partition coefficient Response time High water-cut

Numerical simulation study on CO2 flooding in ultra-low permeability reservoirs

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Numerical simulation study on CO2 flooding in ultra-low perm...

2011 International Conference on Energy and Environment(ICEE 2011)

作者： cui -maolei DING-Yunhong YANG-Zhengming XIONG-Shengchun WANG-Xuewu Institution of Porous Flow&Mechanics Graduate School of Chinese Academy of Sciences Langfang Branch of Petroleum Exploration and Development Research Institute China National Petroleum Corporation

Massive discharge of CO2 has serious impact on the global climate and threatening the survival of humanity and life. How to make waste profitable becomes the subject of attention. Against this issue with my research domain, CO2 could be injected in the oilfield as a kind of oildisplacing agent, especially the ultra-low permeability oilfield with difficulty in water injection. This technology not only displaced oil but also sealed up part of CO2 underground forever. This passage summarized CO2 displacing mechanism, and did research on the opportunity of advanced CO2 injection and the style of cycle CO2 injection by reservoir numerical simulation application in a typical block using Eclipse software. Through comparing with six proposals, the consequences indicated that CO2 flooding technology could be applied in ultra-low permeability oilfield. Advanced CO2 injection and the style of cycle CO2 injection could both have good flooding effect and pressure maintenance degree. The best opportunity of Advanced CO2 injection is 4 months. In cycle injection proposals, increase-decrease style is better than increasesuspend style. These conclusions could not only provide new theoretical basis for gas flooding in ultra-low permeability reservoirs, but also solve the reduction of CO2.

关键词： Numerical simulation advanced CO2 injection cycle CO2 injection enhance oil recovery

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水驱转CO2混相驱渗流机理及传质特征

石油学报 2018年第2期39卷 201-207页

作者：胡伟吕成远王锐崔茂蕾杨阳王欣中国石油化工集团公司海相油气藏开发重点实验室中国石油化工股份有限公司石油勘探开发研究院提高采收率技术研究所中国石油大学博士后科研流动站

CO2混相驱作为三次采油技术一般在注水开发之后实施,其需要考虑水驱后残留在孔隙中的注入水对CO2混相驱的影响。基于常规PVT多次接触实验,采用带多点取样孔的长填砂管,在不同含水阶段分别开展注气驱替实验和气水交替驱实验,研究多孔介... 详细信息

CO2混相驱作为三次采油技术一般在注水开发之后实施,其需要考虑水驱后残留在孔隙中的注入水对CO2混相驱的影响。基于常规PVT多次接触实验,采用带多点取样孔的长填砂管,在不同含水阶段分别开展注气驱替实验和气水交替驱实验,研究多孔介质中可动水参与下的多相多组分渗流规律以及不同含水率对油、气两相组分传质的影响。研究结果表明:在不同含水率下CO2与原油仍能发生混相,CO2的注入形成了新的渗流通道,扩大了水驱波及体积。但高含水率对油相和气相间组分传质有一定的抑制作用。此外,不同含水率下转CO2驱会在储层中形成不同的油、气、水三相渗流和分布特征,从而影响采出程度,而气驱最终采收率主要受注气驱油效率和水驱波及体积共同作用的影响。

关键词：多相多组分混相相间传质含水率气水交替

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高含水条件下CO_2混相驱替实验

石油学报 2017年第11期38卷 1293-1298页

作者：吕成远王锐崔茂蕾唐永强周霞中国石油化工集团公司海相油气藏开发重点实验室北京100083 中国石油化工股份有限公司石油勘探开发研究院提高采收率技术研究所北京100083

油藏水驱后进行CO_2驱已在油田现场取得了成功,但由于油藏的高含水饱和度,导致了CO_2与原油间的接触方式发生改变,混相过程也受到一定制约。为研究高含水条件对CO_2混相驱的影响,制作了盲端微观可视化模型,进行了水驱前后CO_2混相过程... 详细信息

油藏水驱后进行CO_2驱已在油田现场取得了成功,但由于油藏的高含水饱和度,导致了CO_2与原油间的接触方式发生改变,混相过程也受到一定制约。为研究高含水条件对CO_2混相驱的影响,制作了盲端微观可视化模型,进行了水驱前后CO_2混相过程微观实验。结合不同含水饱和度条件下的CO_2驱替实验,明确了CO_2混相驱替特征以及含水饱和度对CO_2驱油效率的影响。结果表明,高含水饱和度会对CO_2与原油的接触过程产生一定的屏蔽作用,注入的CO_2不能直接接触到剩余油,从而导致CO_2与原油的混相过程被大大延缓,进而导致高含水条件下CO_2驱见效时间被推迟。

关键词：高含水条件 CO2驱动态混相盲端模型驱替特征

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改性硅酮CO_(2)增稠剂对流体流变性和驱油效率的影响

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油田化学 2023年第2期40卷 229-234页

作者：眭世元肖朴夫崔茂蕾中国石化石油工程技术研究院北京102206 中国石化石油勘探开发研究院北京102206 页岩油气富集机理与有效开发国家重点实验室北京102206

在压裂过程中,液态CO_(2)压裂液的压裂性能发生了很大的变化。为了改善CO_(2)压裂效果,提高CO_(2)对页岩中原油的置换效率,提出合成硅酮CO_(2)增稠剂的新思路:通过开环聚合和硅氢化反应,将亲CO_(2)短链引入聚合物主链分子间,形成空间网... 详细信息

在压裂过程中,液态CO_(2)压裂液的压裂性能发生了很大的变化。为了改善CO_(2)压裂效果,提高CO_(2)对页岩中原油的置换效率,提出合成硅酮CO_(2)增稠剂的新思路:通过开环聚合和硅氢化反应,将亲CO_(2)短链引入聚合物主链分子间,形成空间网状结构。研究了CO_(2)增稠剂对流体黏度、流变特性和驱油效率的影响。结果表明,增稠剂加量和相对分子质量均能显著改善CO_(2)流体的流变性,其稠度系数随增稠剂加量的增加而增大,而流变性指数呈下降趋势。当体系压力超过12 MPa后,三维网状结构的稳定性加强,表观黏度增加。相比超临界CO_(2)驱,增稠CO_(2)流体能提高0.01μm以上孔隙中原油的动用效率,提高驱油效率12.23百分点。研究结果为改进CO_(2)压裂工艺和CO_(2)增稠剂的分子设计提供了技术参考。

关键词：页岩油二氧化碳增稠剂超临界二氧化碳压裂液

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A review on numerical studies of airflow dynamics and particle deposition in human respiratory system Author links open overlay panel

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Particuology 2024年第8期91卷 351-377页

作者： Hao Jing Xinguang cui School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan430074China

Accurate assessment and prediction of airflow dynamics and particle deposition in the human respiratory tract are essential for human health,involving inhaled drugs for treating various diseases and toxic particles that can cause *** intricate process involves complex multiphase flow with distinct respiratory *** fluid dynamics(CFD)acts as a bridge,overcoming the limitations of in vivo and in vitro experiments and providing a means to fully comprehend and reveal the fundamental mechanisms of respiratory flow and particle behavior on a microscopic *** paper provides a comprehensive overview and concise summary of recent advancements in the numerical simulation of airflow and particle deposition in the human respiratory ***,it summarizes the transition of respiratory tract models from segmented models to emerging physiological characteristic models and whole-lung airway models,and the latest developments on the effects of key factors such as geometric variations,respiratory patterns,and particle physical/chemical properties on respiratory flow and particle deposition.A notable focus of this review is on emerging physiological characteristics models and their associated complex airflow and particle dynamics inside *** paper concludes with recommendations for future research to further advance the development of this field.

关键词： Airflow dynamics Particle deposition Human respiratory system Numerical modeling

Multi-Sensor Fusion Adaptive Estimation for Nonlinear Under-observed System with Multiplicative Noise

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Chinese Journal of Electronics 2024年第1期33卷 282-292页

作者： Yongpeng cui Xiaojun SUN School of Electronic Engineering Heilongjiang University Key Laboratory of Information Fusion Estimation and Detection

The adaptive fusion estimation problem was studied for the multi-sensor nonlinear under-observed systems with multiplicative noise. A one-step predictor with state update equations was designed for the virtual state with virtual noise first of all. An extended incremental Kalman filter(EIKF) was then proposed for the nonlinear under-observed systems. Furthermore, an adaptive filtering method was given for optimization. The fusion adaptive incremental Kalman filter weighted by scalar was finally proposed. The comparison analysis was made to verify the optimization of the state estimation using adaptive filtering method in the filtering process.

关键词： Adaptive systems Information filters Matrices Adaptive estimation Kalman filters State estimation Nonlinear systems