Prediction temperature field and wax deposition based on heat–fluid coupling method

Zhang, Ligang; Sining, Qu; Wang, ChangHao; Guan, Bing

doi:10.1007/s13202-018-0494-8

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…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][5][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][10][11][12]. Nowadays, in the daily production process of gas wells, the phase change of natural gas in the wellbore is becoming more and more common [13,14].…”

Section: Research Status Of Gas-liquid Two-phase Wellmentioning

confidence: 99%

Study on Downhole Throttling Characteristics of High Water Content Gas

Zheng

Dou

et al. 2022

Geofluids

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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.

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Section: Research Status Of Gas-liquid Two-phase Wellmentioning

confidence: 99%

Study on Downhole Throttling Characteristics of High Water Content Gas

Zheng

Dou

et al. 2022

Geofluids

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“…Results show that WAT grows with an increase in the concentration of wax in solution, increase in pressure, water cut, shear rate, the addition of mechanical impurities and decrease in gap size of the measuring system. Zhang et al (2019) proposed a new method for wax deposition location based on heat-fluid coupling method. The regularities of temperature distribution and wax deposition location were simulated with different fluid producing intensities and moisture contents.…”

Section: Wax Prevention By Temperature Controlmentioning

confidence: 99%

Effect of poly (ethylene-butene) and nano-aluminium oxide blend on the viscosity of Nigerian crude oil

Odutola

Idemili

2020

J Petrol Explor Prod Technol

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Wax deposition in production tubing and pipelines is very critical in Nigeria petroleum industry. It can lead to a reduction in production, shut-in of wells, choking of flow lines, failure of downhole equipment, increased power requirement and loss in revenue. In the bid to address this issue, a Niger Delta crude oil sample was characterized in this study to know its wax deposition tendency and other chemical properties. The effect of temperature on the viscosity of the crude oil sample was studied, and the degree of viscosity reduction (DVR) of the crude oil sample in the presence of poly (ethylene-butene) (PEB) and nano-aluminium oxide (Al2O3) blend at different temperatures was evaluated. 100 ppm of nano-Al2O3 blend with 1000 ppm, 2000 ppm and 5000 ppm of PEB, respectively, was added to the crude oil sample at different temperatures, and the degree of viscosity reduction (DVR) in each blend at 10 °C, 15 °C, 20 °C, 30 °C and 35 °C was evaluated. The blend with 2000 ppm of PEB with 100 ppm nano-Al2O3 is the best for offshore application as it gave the highest DVR of 77.9% and 73.7% at 10 °C and 15 °C, respectively, while the other blends gave a DVR of about 70% at 10 °C and 15 °C. As the crude sample temperature approached the wax appearance temperature of 29 °C, the DVR of PEB/Al2O3 blend drastically reduced. PEB/Al2O3 blend inhibited wax precipitation, and at low temperatures, a significant reduction in the viscosity of the crude oil sample was observed, which makes it a good recommendation for offshore application.

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“…The effect of temperature of water for cases (1)(2)(3)(4)(5)(6)(7) For the flow rate of 0.3 m/s of the water, the different temperatures from 55°C to 85°C are considered to investigate the effect on the melting process. The cases (1-7) of Table 2 represent these seven cases.…”

Section: The Melting Process Of the Waxmentioning

confidence: 99%

Numerical study for removing wax deposition by thermal washing for the waxy crude oil gathering pipeline

Jiang¹,

Liu²,

Zhao

et al. 2020

Science Progress

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Exploring the wax removal process by numerical simulation is beneficial for guiding field operations. In this paper, enthalpy-porosity and volume of fluid (VOF) methods were adopted to simulate the melting process of wax in the crude oil gathering pipeline. The melting patterns and liquid fraction of the wax were used to validate the mathematical model. The results show that the wax melts quickly before the liquid fraction reaches 80%, while the remaining 20% melts very slowly. Since the water with higher density sinks to the lower part of the pipeline, the wax in the lower part of the pipeline melts first, while the wax in the upper part of the pipeline melts slowly. The water temperature and flow rate disproportionately affect the melting process. Increasing the water temperature and flow rate can accelerate the melting process, but the effects on shortening the melting time of wax gradually decrease. Increasing the flow rate, the heat transfer rate and the melting rate are increasing progressively, the change of flow rate also affects the outlet temperature of the pipeline.

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Prediction temperature field and wax deposition based on heat–fluid coupling method

Cited by 8 publications

References 18 publications

Study on Downhole Throttling Characteristics of High Water Content Gas

Study on Downhole Throttling Characteristics of High Water Content Gas

Effect of poly (ethylene-butene) and nano-aluminium oxide blend on the viscosity of Nigerian crude oil

Numerical study for removing wax deposition by thermal washing for the waxy crude oil gathering pipeline

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