Abstract
In order not to hinder gas production, we usually hope that the bottom hole effusion can be discharged to the surface with high-pressure natural gas. For the production data of high water content gas wells, the problems of insufficient water content and liquid-carrying capacity affecting gas well production should be considered. Based on the wellbore gas-liquid two-phase pipe flow theory and heat transfer theory, the temperature and pressure coupling prediction model of a high water-bearing gas well is established. Combined with the downhole throttling mechanism and gas-liquid two-phase homogeneous flow theory, the temperature and pressure field distribution model is established. The results show that compared with the Ramey model and Hassan and Kabir model, the temperature and pressure coupling prediction model of high water-bearing gas wells established in this study has the smallest coefficient of variation in the four groups of data tests. Based on this, the effects of different working conditions and choke diameter on downhole throttling characteristics of high water-bearing gas wells are analyzed. The findings of this study are helpful to better predict the wellbore temperature and pressure coupling of high water-bearing gas wells and provide more effective help for the smooth production of gas wells.
Highlights
The fluid flow in the wellbore is regarded as onedimensional flow, that is, the flow parameters and physical parameters of gas and liquid phases on any section of the pipeline are uniform, which is the average value of the section
Gas wells with low liquid content are generally treated as single-phase pure gas wells, but for gas wells with high water content, the pressure and temperature prediction model of single-phase gas wells cannot meet the accuracy requirements, so it is necessary to reestablish the pressure and temperature prediction model on the basis of considering water content
It is necessary to establish a gas-liquid twophase pipe flow model in high water-bearing gas wells to describe the dynamic model of gas and liquid wellbore flow
Summary
The prediction of wellbore temperature and pressure field has always been a major problem of common concern to scientists [1] because it is related to the accurate construction of oil production technology [2, 3], the safety of pipe string [4–6], the normal use of various downhole tools [7], the reliability of production process [8], and the wax and scale prevention of oil and gas wells affected by temperature and pressure [9–12]. Based on Turner’s model, Gray considered the influence of temperature gradient, gas composition, fluid acceleration, and other factors during liquid carrying in gas wells and obtained the wellbore pressure drop of gas-liquid twophase pipe flow by using an empirical model [17]. In 2010, Chaoyang adopted a new ellipsoid model [20], considered the influence of droplet physical model and size on stress mode, analyzed the liquid-carrying process of gas wells with liquid in the wellbore, and obtained a new ellipsoid calculation model. In 2012, Zhibin and Yingchuan considered the influence of droplet parameters, stress model, and other factors on the liquid-carrying capacity and gave a reasonable explanation for the difference in the calculation results of liquidcarrying capacity of each gas field [21], but the model ignored the change of fluid flow pattern in the wellbore. The numerical simulation of downhole throttling is carried out
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