Thermodynamic model of steam injection pipeline considering the effect of time and phase change

• Autorzy: Zhao Xuan , Niu Chengcheng , Wang Jun , Zhu Xiuxing
• Języki publikacji: EN

Abstrakty

EN

Thermodynamic parameters in heavy oil thermal recovery wells form the basis for evaluating the thermal efficiency of steam injection. However, various factors in wellbores affect the variation law of thermodynamic parameters, hindering attempts to make an accurate description of them. A thermodynamic model of wellbores is proposed in this study which factors in the effects of time and phase change with a view to: (i) improving the accuracy of thermodynamic parameter analysis, and (ii) identifying the main factors and rules that govern thermal efficiency. With the time factor considered, the transient conduction function of a coupled wellbore-formation was established, and the heat loss during steam injection was analyzed. Meanwhile, a wellbore pressure gradient equation was established using the Beggs-Brill model with consideration of the influence of phase transformation in wellbore. Steam pressure, which varies with flow pattern, was also analyzed. The accuracy of the proposed model was verified by comparing the results of the analysis with the test data. Taking this approach, the influence of steam injection parameters on thermal efficiency was studied. The results demonstrate that the relative error of the pressure analysis result of proposed model is 1.06% and the relative error of temperature is 0.24%. The main factor affecting thermal efficiency is water in the annulus of the wellbore, followed by the steam injection rate. The thermal efficiency of the wellbore is about 80% when the water depth in the annulus is 300 m. An increase in the injection rate or extension of the injection time can improve thermal efficiency, whereas an increase in steam injection pressure reduces thermal efficiency. The proposed method provides good prospects for optimizing high efficiency steam injection parameters of heavy oil thermal recovery wells.

Słowa kluczowe

EN

thermal recovery well; thermal efficiency; phase change; parameter sensitivity

PL

odzyskiwanie ciepła; wydajność termiczna; zmiana fazy; czułość parametru

• Wydawca: Institute of Heat Engineering, Warsaw University of Technology
• Czasopismo: Journal of Power Technologies
• Rocznik: 2019
• Tom: Vol. 99, nr 2
• Strony: 123--130
• Opis fizyczny: Bibliogr. 18 poz., rys., tab., wykr.

Twórcy

autor

Zhao Xuan

• College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
• SINOPEC International Petroleum Company Colombia Branch, Bogotá, Colombia

autor

Niu Chengcheng

• SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China

autor

Wang Jun

• SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China

autor

Zhu Xiuxing

• College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).