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Yongge Liu¹, Huiqing Liu¹, Qing Wang¹, Zhanxi Pang¹
Structural Longevity, Vol.9, No.2, pp. 75-85, 2013, DOI:10.3970/sl.2013.009.075
Abstract Foam performances including interfacial tension, foam volume, halflife period and plugging ability are investigated in laboratory. A numerical model is built to simulate sand production during thermal recovery. The changes of reservoir permeability and steam breakthrough time after sand production are analyzed. Based on experimental results, an integrated model which considers foam generation, coalescence, oil acceleration on foam decay and sand production is built to study nitrogen foam assisted steam flooding with sand production. Simulation results show that foam can improve areal sweep efficiency and delay steam breakthrough time significantly. However, the adverse effect is More >

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Chuan Lu¹, Huiqing Liu¹, Keqin Lu², Cheng Liu³
Structural Longevity, Vol.9, No.2, pp. 87-103, 2013, DOI:10.3970/sl.2013.009.087
Abstract The development effect of horizontal well in oil reservoir with bottom water is extremely sensitive to drawdown pressures. Since water coning is inevitable, it is significant to analyze the impact of drawdown pressures on post water breakthrough performance of horizontal wells. Based on a small-scale and discretized physical simulation system, the impact of different drawdown pressures, as well as the influence of changing drawdown pressures in different water cut stage, on the following indexes is discussed: increasing rates of water cut, oil recovery difference and displacing efficiency of bottom water. The results show that under… More >

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Tian Shubao¹, Lei Gang¹, He Shunli¹
Structural Longevity, Vol.9, No.2, pp. 105-117, 2013, DOI:10.3970/sl.2013.009.105
Abstract The dynamic capillary pressure is one of the important factors affecting the two phase percolation mechanism of waterflooding in extra low permeability reservoir. It is crucial to understand the effect of dynamic capillary pressure on oil displacement process in order to improve the waterflooding effectiveness. In this paper the dynamic capillary pressure effect was investigated quantitatively and a numerical flow model was built, in which the dynamic capillary pressure is considered. The effects of dynamic capillary pressure and water injection rate on the waterflooding effectiveness were analyzed. The results show that the dynamic capillary pressure More >

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Zhao Hua^1,2, Meiqin Lin^1,2, Zhaoxia Dong^1,2, Zihao Yang^1,2, Mingyuan Li^1,2, Jie Yang^1,2, Xiuling Ji^1,2
Structural Longevity, Vol.9, No.2, pp. 119-129, 2013, DOI:10.3970/sl.2013.009.119
Abstract In this paper, scanning electron microscopy (SEM), dynamic lighting scattering (DLS) and HAAKE rheometer experiments were adopted for investigating on the shape, size and rheological property of nanoscale polymer microspheres. Besides, nuclear-pore film filtration, sand packed tube displacement and core displacement experiments were also adopted to study the mechanism of deep pro- file control and oil displacement of nanoscale polymer microspheres. The results demonstrated that the original shape of the nanoscale polymer microspheres were typically spherical with a size range of 30-60nm. When the microspheres were dispersed in water, the grain diameter of them increased… More >

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Duan Xiang-gang^1,2,3, Hou Ji-rui^1,2,3, Liu Hui^1,2,3, Yin Zhong-min⁴, Tang Yong-qiang^1,2,3, Su Wei^1,2,3
Structural Longevity, Vol.9, No.2, pp. 131-142, 2013, DOI:10.3970/sl.2013.009.131
Abstract As an enhance oil recovery method, Alkali, surfactant and polymer (ASP) flooding has been already widely used in Daqing oilfield. However, there are many challenges to reservoir formation by using the ASP flooding, such as the reaction between alkali and clay mineral, adsorption of surfactant and retention of polymer, which may cause damage to oil and gas formation. In order to evaluate the formation damage, reservoir sensitivity is researched.
Through the core flow testing, the sensitivity of velocity, water, alkali and acid of core sample has been studied. The core samples are taken from the formation… More >

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