Tianjin Petroleum Vocational and Technical College

Tianjin, China

Tianjin Petroleum Vocational and Technical College

Tianjin, China
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Meng Q.,Tianjin Petroleum Vocational and Technical College | Lv F.-B.,Tianjin Petroleum Vocational and Technical College | Liu H.-B.,Tianjin Petroleum Vocational and Technical College | Meng F.-L.,Downhole Operation Company of Shengli Oilfield | Li Z.-Y.,Russia Gubojin Guoli Petroleum University
Well Testing | Year: 2015

The low permeability reservoir has the geological characteristic of low porosity, low permeability and high water saturation, the gas flows will be effected by high-speed non-Darcy effect, start-up pressure, stress sensitivity and slippage effect, and the gas production wells always do not have the industrial value unless fracturing the reservoir. By conformal transformation, the fracturing gas well productivity equation is built considering the 4 factors, which can analyze the gas well production capacity of arbitrary combination based on the need of the field. By analyzing the effect of each factor on the fracturing gas well deliverability equation, it shows that stress sensitivity, start-up pressure, high-speed non-Darcy effect can decrease gas well productivity, among them the effect of stress sensitivity is the biggest, the effect of start-up pressure in fracturing gas well is far smaller than in the not fracturing, and the slippage effect can increase the fracturing gas well productivity a certain extent. The gas well open-flow capacity considering these factors is less 13. 68 than that of no considering. So, the influences from these factors should be considered in the conditions allow. This study provides the theoretical foundation for fracturing gas well productivity forecast and rational proration. ©, 2015, Well Testing. All right reserved.


Pan X.,Nankai University | Pan F.,Tianjin Petroleum Vocational and Technical College | Gao Y.,Nankai University | Ma Z.,Nankai University
Lecture Notes in Electrical Engineering | Year: 2014

The fine agriculture environmental monitoring system uses the large area data acquisition technology based on wireless sensor network. It can endlessly monitor soil information all the time and provide reliable basic facts for the planting plan and field management. This system adopts hierarchical network topology, with the upper layer network using self-organization topology and the under layer network using star topology. In order to better solve the energy supply problem of the cluster-head nodes, the energy supply system based on solar energy is proposed. The experiment shows that this system is highly reliable and enjoys good expansibility and great practical value. © 2014 Springer Science+Business Media New York.


Li Q.,Tianjin University | Li L.,Tianjin University | Li J.,Tianjin University | Li J.,Tianjin Petroleum Vocational and Technical College | Guo Y.,Tianjin University
Applied Mechanics and Materials | Year: 2010

In order to solve the problems existing in geometric simulation of cutting process, slice segmentation method was presented in this paper. The instantaneous shape of roughcasts which are cut can be represented by the characteristics set that can be obtained through proper slice of machined parts and the intersection calculation of cutter and machined parts. By using this method, the accurate result of intersection calculation can be accurate and be gotten rapidly. Besides, because this method is based on visual C++ and OpenGL, it can be isolated from the commercial software. The method is proved to be feasible by the cutting simulation example of cylinder gears and bevel gears. © (2010) Trans Tech Publications.


Jiao Y.,Tianjin University | Lin M.,Tianjin University | Zhai X.,Tianjin Petroleum Vocational and Technical College | Ji M.,Tianjin University
Advanced Materials Research | Year: 2013

The internal combustion engine should be enlarged the cylinder diameter for the Power requirements. In order to ensure the engine to work normally, it is needed to compute the strength of the connecting rod. Through adopting ANSYS software, the three-dimensional computational model is constructed, and the stress analysis is carried out. We can learn the stress field of process of deformation. Through calculation the stress and strength of connecting rod are derived. Using the stress which was calculated from ANSYS we can decide the Safety of connecting rod. In general, the analysis is meaningful to optimize the design of connecting rod. © (2013) Trans Tech Publications, Switzerland.


Li D.-G.,Tianjin Agricultural University | Zhang Y.,Tianjin Petroleum Vocational and Technical College | Zheng Z.-W.,Tianjin Agricultural University
Advances in Civil Engineering and Building Materials - Selected Peer Reviewed Papers from 2012 2nd International Conference on Civil Engineering and Building Materials, CEBM 2012 | Year: 2012

Through comparing and analyzing the advantages and disadvantages of three models widely used in the distribution of urban traffic forecasts, paper explores the gravity model, which is applied to urban traffic distribution forecast, with the maximum entropy method. It not only overcomes the gravity model's limitations of no reliable theoretical basis and the complex process of parameters calibration, but also makes full use of the basis of the complete theory of physics of maximum entropy method and reveals the inner meaning of the traffic characteristics. At the same time, it simplifies the process of gravity model's parameters calibration. The gravity model with the function of cost impedance, which is derived by the maximum entropy method, has very broad applicability and fully takes the influences, which are the results of the improvement of the transportation network, on the trip expenses into account. Consequently, its application will have promising prospect for the forecast of transportation distribution. © 2013 Taylor & Francis Group, London.


Li D.-G.,Tianjin University | Gao X.-P.,Tianjin University | Zhang Y.,Tianjin Petroleum Vocational and Technical College
Advanced Materials Research | Year: 2011

This paper presents an analytic solution for the diffraction of plane P waves by a cylindrical inclusion in half space by Fourier-Bessel wave function expansion method, in which the flat surface of half space is approximated by a large curved surface. The equation can be constructed by the continue boundary and the free surface condition. Based on parametric analysis, the impact of the inclusion on surface displacement amplitude is discussed. It is illustrated that there is large difference of the diffraction characteristics between the hard inclusion and soft inclusion. The displacement response depends strongly on the incident angle and frequency. The diffraction effect can be ignored with large embedded depth of the inclusion. © (2011) Trans Tech Publications, Switzerland.


Hao J.,Southwest Petroleum University | Su X.-B.,China National Petroleum Corporation | Lu G.-X.,Tianjin Petroleum Vocational and Technical College | Dai C.-R.,Petrochina | Xie Y.-N.,China University of Petroleum - East China
Geology in China | Year: 2011

In consideration of the poor hydrocarbon exploration of the study area, the authors firstly studied the petrologic characteristics and reservoir characteristics, and divided diagenesis into two types on the basis of an analysis of diagenesis and diagenetic sequence, and then conducted the quantitative analysis of the E1t1 and E1t 1 separately, which developed the porosity evolution model and deepened the understanding of the reservoir formation procedure as well as the influencing factors. The result shows that the porosity evolution features were controlled jointly by the sedimentary environment, material source, parent rock properties of the provenance, diagenesis, and tectonic process.


Li D.G.,Tianjin Agricultural University | Ying Z.,Tianjin Petroleum Vocational and Technical College | Zhu X.Q.,Tianjin Agricultural University
Applied Mechanics and Materials | Year: 2014

Previous papers which researched the effects of spray angle were mainly focused on the influence of spray angle on the performance and emissions of diesel engine. Few papers clarified the effect of spray angle on the airflow in detail. Airflow and turbulence have a significant influence on the combustion and distribution of emissions. The effects of spray angle on the flow, combustion and emissions of diesel engine were studied in this paper by a numerical simulation method. The results indicated that the spray angle had an obvious impact on the vortex and turbulence. The distribution of high temperature areas and emissions depend on the vortex and turbulence. With the increase of spray angle, the maximum cylinder pressure and temperature increase gradually. The heat release rate increases with the increase of spray angle. The CO and soot emissions were the lowest when the spray angle is 155°, however, the NOx emissions was the highest at that spray angle. © (2014) Trans Tech Publications, Switzerland.


Li D.-G.,Tianjin University | Zhang Y.,Tianjin Petroleum Vocational and Technical College
Journal of Natural Disasters | Year: 2011

The scattening of plane SV waves by a cylindrical inclusion in half space was calculated by Fourier Bessel wave expansion method, in which the flat surface of half space was approached by a large cylindrical surface. The equation can be constructed and solved by the continue boundary and the free surface condition. Based on parameter analysis, the effect of the inclusion and the incident wave on surface displacement amplitude was discussed. It is shown that there is large amplification effect of surface displacement response near the inclusion. The displacement response depends strongly on the angle and frequency of incident SV wave. The scattering effect can be ignored for a large depth of the inclusion.


Hao J.,China National Petroleum Corporation | Zeng J.,China National Petroleum Corporation | Xie H.-S.,Tianjin Petroleum Vocational and Technical College | Dai C.-R.,China National Petroleum Corporation | Xie Y.-N.,China University of Petroleum - East China
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2011

The diagenetic results of reservoir bed of the 1st member of Taizhou Formation (E1t1) in the Yangxin sub-depression located in Baiju Sag in North Jiangsu Basin are studied in detail by means of the identification of the casting sides under microscopes combined with scanning electron microscopy (SEM), X-ray diffraction analysis, cathodoluminescence, and other analytical tools. Based on the analyz set of the different diagenesis types, the diagenetic stages are classified and the impacts of the diagenesis on the reservoir properties are analyzed. The conclusions are reached that E1t1 dose not basically come into middle diagenetic stage B or late diagenesis stage, and that the secondary porosity of E1t1 is the main rock pore under dissolutions and it is also the favorable reservoir space, which provides a solid foundation for understanding the accumulative spaces of the Formation.

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