Open Access
ARTICLE
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 that foam will intensify
the… More >
Open Access
ARTICLE
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
different drawdown pressure, the variation… More >
Open Access
ARTICLE
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 has a significant influence on… More >
Open Access
ARTICLE
Zhao Hua1,2, Meiqin Lin1,2, Zhaoxia Dong1,2, Zihao Yang1,2, Mingyuan Li1,2, Jie Yang1,2, Xiuling Ji1,2
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 by 3-6 times due to… More >
Open Access
ARTICLE
Duan Xiang-gang1,2,3, Hou Ji-rui1,2,3, Liu Hui1,2,3, Yin Zhong-min4, Tang
Yong-qiang1,2,3, Su Wei1,2,3
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 in
Daqing oilfield with… More >
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