Abstract
With the development of gas well exploitation, the calculation of wellbore with single-phase state affected by single factor cannot meet the actual needs of engineering. We need to consider the simulation calculation of complex wellbore environment under the coupling of multiphase and multiple factors, so as to better serve the petroleum industry. In view of the problem that the commonly used temperature and pressure model can only be used for single-phase state under complex well conditions, and the error is large. Combined with the wellbore heat transfer mechanism and the calculation method of pipe flow pressure drop gradient, this study analyzes the shortcomings of Ramey model and Hassan & Kabir model through transient analysis. Based on the equations of mass conservation, momentum conservation and energy conservation, and considering the interaction between fluid physical parameters and temperature and pressure, the wellbore pressure coupling model of water-bearing gas well is established, and the Newton Raphael iterative method is used for MATLAB programming. On this basis, the relationship between tubing diameter, gas production, gas–water ratio, and wellbore temperature field and pressure field in high water-bearing gas wells is discussed. The results show that the wellbore temperature pressure coupling model of high water-bearing gas well considering the coupling of gas–liquid two-phase flow wellbore temperature pressure field has higher accuracy than Ramey model and Hassan & Kabir model, and the minimum coefficients of variation of each model are 0.022, 0.037 and 0.042, respectively. Therefore, the model in this study is highly consistent with the field measured data. Therefore, the findings of this study are helpful to better calculate the wellbore temperature and pressure parameters under complex well conditions.
Highlights
The prediction of wellbore temperature and pressure field has always been a major problem of common concern to scientists (Mirabbasi et al 2020), because it is related to the accurate construction of oil production technology (Li et al 2020; Jung et al 2020), the safety of pipe string (Guo et al 2021; Li et al 2021; Wang et al 2019a), the normal use of various downhole tools (Wang Sifan, Zhang Ankang, Hu Dongfeng 2021), the reliability of production process (Wang et al 2019b), and the wax and scale prevention of oil and gas wells affected by temperature and pressure (Wei et al 2017; Dalong et al 2021; Yang et al 2021; Wang 2019)
The wellbore temperature–pressure coupling model of a water-bearing gas well is established by combining wellbore heat transfer mechanism and gas–liquid two-phase homogeneous flow equation (Fig. 1)
The purpose of this study is to model and analyze the throttling production process of high water content gas wells, which is not suitable for other working conditions
Summary
The prediction of wellbore temperature and pressure field has always been a major problem of common concern to scientists (Mirabbasi et al 2020), because it is related to the accurate construction of oil production technology (Li et al 2020; Jung et al 2020), the safety of pipe string (Guo et al 2021; Li et al 2021; Wang et al 2019a), the normal use of various downhole tools (Wang Sifan, Zhang Ankang, Hu Dongfeng 2021), the reliability of production process (Wang et al 2019b), and the wax and scale prevention of oil and gas wells affected by temperature and pressure (Wei et al 2017; Dalong et al 2021; Yang et al 2021; Wang 2019). The model is only applicable to the study of the separation efficiency of the new filter separator, and the calculation of the temperature and pressure field of the key parameters in the wellbore of high water-bearing gas wells is not discussed. This study analyzes the shortcomings of Ramey model and Hassan & Kabir model, and gives an appropriate gas–liquid two-phase flow wellbore temperature and pressure field coupling calculation model. The value of the Ramey model is to simplify the model into the radial heat conduction problem of the infinite cylinder by introducing a dimensionless time function Such use of reservoir engineering transient fluid flow can be completely solved. Compared with Ramey model and Hassan & Kabir model, the model of this study is established
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