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Establishment and Analysis Method of Energy Efficiency Index System of Oil Field Gathering and Transportation System
Cheng Qinglin, Chang Tai, Wang Yuxin, Wang Shuang, Wang Ronghuan, Meng Fanqi
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338
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The analytic hierarchy process is introduced to construct energy efficiency index system of gathering and transportation system, which provides a favorable means for energy efficiency evaluation of the system as a whole. Combining with the triangular fuzzy number in fuzzy theory, the judgment matrix construction and weight calculation of AHP are reformed. To some extent, it reduces the defects of hierarchical analysis, such as the strong subjective factors of legal person and the neglect of the model of people's cognition of objective things, and makes the evaluation results more accurate and comprehensiv. Taking a gathering and transportation block of oilfield as an example, the weakness of its energy consumption is found out, and the improvement suggestions are put forward.
2020, 33 (5): 67-73.
DOI:
10.3969/j.issn.1006-396X.2020.05.012
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The Determination and Application of Gathering Radius of Multiphase Mixed Transportation Pipeline at Normal Temperature
Cheng Qinglin, Huang Zuonan, Sun Wei, Duan Zhigang, Gan Yifan, Chang Tai
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504
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The energy consumption of oil gathering increases rapidly after the oil field enters the high water cut stage.If the normal temperature gathering and transportation is carried out,the cost can be saved,which can bring the enterprise benefit.In order to judge whether the pipeline can carry out normal temperature gathering and transportation,according to the field measured data,the thermo⁃hydraulic calculation model is constructed and modified, the thermo⁃hydraulic coupling calculation is carried out, the normal temperature gathering and transportation radius of the pipeline is determined,and the sensitivity of each influencing factor of the normal temperature gathering and transportation radius is sequenced by the single factor sensitivity analysis method.On this basis,the normal temperature gathering radius chart is developed to provide guidance for the surface normal temperature gathering work.The results show that the modified thermo⁃hydraulic model can predict the pressure drop and temperature drop of the pipeline,and the average relative errors between the calculated value and the measured value are 9.42% and 5.31%.The three most influential factors on the normal temperature gathering radius are the starting point temperature,the starting point pressure and the liquid production.The chart drawn by the above three factors provides the basis for the feasibility of normal temperature gathering and transportation in the pipeline,if not,the temperature and pressure required for the starting point of the pipeline can be determined by querying the chart.
2020, 33 (2): 76-82.
DOI:
10.3969/j.issn.1006-396X.2020.02.013
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Fitting and Correction of H-Q Outgoing Performance Curve of Centrifugal Pump
Cheng Qinglin,Ma Yanxin,Yang Jinwei,Feng Yun,Gan Yifan,Huang Zuonan
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625
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According to the principle of least square method, the H-Q curve of the centrifugal pump is fitted with power function, polynomial and exponential function, and the error analysis of fitting curve is carried out by using the data of factory performance curve. The results show that the accuracy of fitting with polynomial is higher. After the fitting is completed, the centrifugal pump will have a certain deviation from the factory performance curve provided by the equipment manufacturer in actual operation. Because the number of pump operation data may be very small, the output performance curve is corrected by moving up and down from left to right. To correct the factory performance curve, the actual engineering data are used to correct the performance curve, which makes the corrected performance curve more applicable to actual production. An example analysis shows that the head is calculated to be 60 m without correction and 94 m after calibration. Assuming that a pump can provide a head of 60 m, if we use the pump scheme without correction, one pump is turned on, but in fact one pump is far from satisfactory. Therefore, the calibration of the pump's factory performance curve has a great influence on the subsequent pumping schemes.
2019, 32 (4): 78-84.
DOI:
10.3969/j.issn.1006-396X.2019.04.013