Cheng Yuanfang
China University of Petroleum
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Featured researches published by Cheng Yuanfang.
Royal Society Open Science | 2018
Zhang Chao; Yan Chuanliang; Liu Yuwen; Li Yang; Cheng Yuanfang; Tian Ji
The ever-decreasing oil resources receive more and more attention for the exploration and development of heavy oil reservoirs. Owing to the high viscosity and poor fluidity of heavy oil, it is necessary to use the method of injecting high-temperature fluid in the development process. But, this will cause a significant increase in the temperature in oil reservoir, and thus the compression coefficient of reservoir rock has a greater impact. The compression coefficient of heavy oil reservoirs at different temperatures was tested. The results show that the compression coefficient of rock is closely related to the nature of rock itself and its stress and temperature environment: the compression coefficient increases with the increase in rock porosity; the compression coefficient decreases with the increase in the effective confining pressure and increases with the increase in temperature. When the temperature is low, the increase in the compression coefficient is larger. As the temperature increases, the increase in the compression coefficient tends to decrease gradually. Because the temperature of the reservoir is higher than that of the ground, the influence of the temperature on the reservoir compression coefficient should be taken into account when carrying out the production forecast.
Journal of Petroleum Exploration and Production Technology | 2017
Yan Chuanliang; Cheng Yuanfang; Tian Ji; Zhu Guojin; Yuan Zhongchao; Liu Yuwen; Deng Fucheng
The diminishing oil resources make the exploration and development of heavy oil reservoirs more and more important. Heavy oil reservoirs need steam stimulation or other thermal development methods; temperature increasing during the thermal recovery process will inevitably affect the reservoir compressive characteristics. In order to study the variation of the compression coefficient of heavy oil reservoirs in the multi-round steam stimulation process, the compression coefficients of the reservoirs after different temperature and pore pressure cycles were tested. The results show that the compression coefficient of heavy oil reservoir decreases with the increase in effective confining pressure and increases with the increase in test temperature; After the temperature and pore pressure cycle, the compression coefficient of the rock is greatly reduced; the decrease in range of compression coefficient of the reservoir after the temperature and pore pressure cycle increases with the increase in the test temperature, and increases with the increase in maximum effective confining pressure. The dynamic variation of the reservoir compression coefficient must be taken into account in the prediction of the production capacity of multi-round steam stimulation.
IOP Conference Series: Earth and Environmental Science | 2017
Shi Jihui; Cheng Yuanfang; Li Xiaolong; Xiao Wen; Li Menglai
To ensure desirable outcome of hydraulic fracturing based on ultra-short radius radial systems, it is required to investigate the stress distribution regularity and stability of the cement sheath. On the basis of the theoretical model of the cement sheath stress distribution, a reservoir mechanical model was built using the finite element software, ABAQUS, according to the physical property of a certain oil reservoir of the Shengli oilfield. The stress distribution of the casing-cement-sheath-formation system under the practical condition was simulated, based on which analyses were conducted from multiple points of view. Results show that the stress on the internal interface of the cement sheath exceeds that on the external interface, and fluctuates with higher amplitudes, which means that the internal interface is the most failure-prone. The unevenness of the cement sheath stress distribution grows with the increasing horizontal principal stress ratio, and so does the variation magnitude. This indicates that higher horizontal principal stress ratios are unfavourable for the structural stability of the cement sheath. Both the wellbore quantity of the URRS and the physical property of the material can affect the cement sheath distribution. It is suggested to optimize the quantity of the radial wellbore and use cement with a lower elastic modulus and higher Poissons ratio. At last, the impact level of the above factor was analysed, with the help of the grey correlation analysis.
Petroleum Science | 2007
Cheng Rongchao; Wang Ruihe; Cao Huilian; Bu Yuhuan; Cheng Yuanfang
In view of the inadequate cementing quality in the cementation for long isolation intervals of oil and gas wells, and considering the field practice in Tarim Oilfield, a nanometer material LC-212 was introduced as the base stock to experimentally develop a new spacer system NMS-I, in combination with other materials, including a chemical gel plugging agent, carboxymethyl cellulose and barite. Experimental results indicated that the system had a wide adjustable range of density, good rheological property, static stability and compatibility with cement slurry. It also showed no flocculating or thickening effect on the water-base drilling fluid and low-density cement system. Meanwhile, the capacity of lost circulation control and the influence of the spacer on the second interfacial cementing strength were evaluated by a self-made lost circulation simulator and shearing test facility. The results showed that the spacer had favorable plugging and flushing effect, and the second interfacial cementing strength can be greatly improved. Moreover, based on the experiments, the mechanisms of spacer function were analyzed. The results obtained from the investigation offer a novel approach to resolving some practical problems in cementing jobs.
Archive | 2015
Huang Haoyong; Cheng Yuanfang; Han Zhongying; Yan Chuanliang; Zhu Xinchao; Jia Jianghong; Ma Qingtao
Archive | 2016
Wang Huaidong; Cheng Yuanfang; Han Zhongying; Chang Xin; Shu Shangwen; Chen Tianqing; Wang Wei
Archive | 2015
Han Zhongying; Cheng Yuanfang; Huang Haoyong; Wang Wei; Li Menglai
Oil Drilling & Production Technology | 2008
Cheng Yuanfang; Shen Haichao; Zhao Yi-zhong
52nd U.S. Rock Mechanics/Geomechanics Symposium | 2018
Han Songcai; Cheng Yuanfang; Gao Qi; Liu Chengxi; Han Zhongying; Zhao Wenbin
Archive | 2017
Yan Chuanliang; Chen Kaiwen; Cheng Yuanfang; Ding Jiping; Teng Fei; Li Qingchao; Zhang Huaiwen