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Time filter

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Liu H.,Yangtze University | Wang X.,Key Laboratory for Petroleum Engineering
Proceedings 2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011 | Year: 2011

In Finite difference method, time step-size adaptation must take decreasing calculating error and time consuming in long time simulation in consideration. Based on finite difference method, a new improved difference method was proposed to solve linear seepage flow: Firstly by Laplace transform time variable was eliminated and Laplace mathematics model was proposed, then the mathematics model was solved by finite difference method, finally the wellbore pressure or production was obtained by numerical Inversion algorithm. The calculating results show that, the calculating error of improved difference method is smaller than finite difference method, though it has high time consuming in each step calculating, the improved difference method has more advantage in long time simulation because calculating any moment simulation doesn't rely on other moment calculating results. © 2011 IEEE. Source


Liu H.,Yangtze University | Wang X.,Key Laboratory for Petroleum Engineering
Proceedings - 2011 International Conference on Computational and Information Sciences, ICCIS 2011 | Year: 2011

Domestic and overseas investigation showed that boundary element method was widely used in seepage flow, but it was mostly used in well bore pressure curve feature research of different reservoir types. Its use in unsteady production prediction has not been reported. Based on unsteady pressure dynamic problems research by boundary element method, the calculating method used to predict unsteady production by boundary element method is provided for the first time after adjusting the boundary integral equation. For checking prediction results, the homogeneous reservoir production with closed boundary or stable boundary was predicted, the small error with analytical solution showed that the production predicting method is accurate. © 2011 IEEE. Source


Liu T.,China University of Petroleum - Beijing | Liu T.,China National Petroleum Corporation | Liu T.,Beijing Key Laboratory of GHG Storage and Utilization | Liu T.,Key Laboratory for Petroleum Engineering | And 4 more authors.
Advances in Mechanical Engineering | Year: 2014

Since COStimulation in Horizontal Wells can avoid the problem of steam flooding, clay swelling, and sand production, it has been carried out in many fields. To improve the research on the controlling factors and their influence and establish a specific reservoir selecting method, this paper founded the components and geology model according to typical heavy oil reservoirs firstly. Comparing with pilot test, the theoretical model result could give expression to the characteristic of large water ratio descend rang, long period of validity, and high rounds effectiveness. Secondly, this study designed simulation scheme including factors of geology, development, and stimulation technology, to filter the controlling factors of the oil incremental and well reopened water cut and describe their influence. Based on it, we proposed a quick filter criterion to choose heavy oil reservoirs for COstimulation. © 2014 Tongjing Liu et al. Source


Liu T.,China University of Petroleum - Beijing | Liu T.,China National Petroleum Corporation | Liu T.,Beijing Key Laboratory of GHG Storage and Utilization | Liu T.,Key Laboratory for Petroleum Engineering | And 3 more authors.
Advanced Materials Research | Year: 2012

The speed of development of well test technology has been faster than well test interpretation technology in low permeability reservoirs. One of the main research directions for well test soft technology was specific interpretation theory and interpretation techniques. In recent years, well test was put forward higher request by the production complex and low permeability reservoirs. Test interpretation results urgently need to be applied to reservoir engineering analysis in-depth and quantitatively. One of the limited reality conditions of well test application was lack of the comprehensive research combined with the reservoir engineering. Combining with the test examples, the investigation radius change between injection-production wells was studied, and the build-up well test cycle in low permeability reservoir was optimized. According to the actual process situation, it was proposed that take 20d as the upper limit of well test cycle, and 10d block as the lower limit of well test cycle of build-up well test in a typical low permeability reservoir. © (2012) Trans Tech Publications, Switzerland. Source


Lv Z.,China National Petroleum Corporation | Li S.,Key Laboratory for Petroleum Engineering | Li S.,China University of Petroleum - Beijing | Liu G.,Key Laboratory for Petroleum Engineering | And 5 more authors.
Petroleum Science and Technology | Year: 2013

Horizontal well technology has been widely used in developing oil fields. Very commonly, these wells are hydraulically fractured to improve productivity in low permeability reservoirs. The productivity of a multifractured horizontal well is mainly affected by reservoir properties and fracture parameters. A simple and accurate method for evaluating and optimizing productivity of this type of wells is not available and is highly desirable to reservoir engineers. The authors analyzed the equipressure contour, velocity vector distributions, and the influence of factors such as ratio of vertical permeability to horizontal permeability, anisotropy of plane permeability, hydraulic fracturing angle, fracture distribution, and morphology on horizontal well's productivity by finite element numerical simulation method. The results show that optimizing the well trajectory and direction can reduce the degree of reservoir permeability anisotropy influencing on the productivity of well. Hydraulic fracture tilt or angles among multifractures due to natural fractures or ground stress can lower the productivity. Asymmetric distribution of fractures about wellbore can improve production and distribution with staggered interval can generate greater production. When the space between hydraulic fractures is small, fractures bend at a small angle and display a separated trend due to interference among fractures. In this case production has a little increase. Finite element numerical simulation method is accurate and intuitive when simulating percolation field of fractured horizontal wells. The results have certain reference significance for in situ fracturing operations. © Taylor and Francis Group, LLC. Source

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