Effect of the dispersion degree of asphaltene on wax deposition in crude oil under static conditions

Lei, Yun; Han, Shanpeng; Zhang, Jinjun

doi:10.1016/j.fuproc.2016.02.005

Cited by 82 publications

(48 citation statements)

References 23 publications

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“…The natural convection was considered within the paper. The issue was solved as stationary (Lei, 2016). The thermophysical properties of solid materials did not depend on temperature.…”

Section: Methods Of Solving Problemmentioning

confidence: 99%

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

Лекомцев¹,

Kang²,

Galkin³

et al. 2020

PTQ

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One of the main oil production complications is that asphaltene-resin-paraffin deposits (ARPD) are formed during production wells' operation. This is an urgent problem in the oil and gas industry, especially in the fields of the Ural-Volga region (Russia). This study aimed to develop a technological solution for the effective thermal treatment of deposits based on the wells' thermal state calculation during a sucker rod pump operation. In practice, the thermal effect on ARPD is carried out by flushing-out with a hot agent (water, oil). Traditionally, flushes are carried out through the casing annulus. However, this method is ineffective due to large heat losses and the impossibility of heating the inner part of the tubing in a sufficient way, where ARPD is deposited. Dynamic modeling of the process was performed in the ANSYS Fluent software product. The heat problem was solved on the basis of the Navier-Stokes Reynolds-averaged heat and mass transfer equation. It was noted that the temperature of the injected agent (hot oil or water) affects the temperature of the tubing's inner wall to a lesser extent than the coolant flow rate. It has been established that it is impossible to reach the melting point of wax at the submersible pump level. The flow rate of the coolant affects this parameter more intensively. When flushing with hot oil 120°C with a flow rate of 300 m3 /day, the temperature above the pump will be equal to the wax melting temperature. Calculations indicate that it is most advisable to use oil heated to 120°C as a coolant for flushing wells than water with a 90°C temperature. The implementation of the methods proposed can be used on any well equipped with a sucker rod pump.

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“…The natural convection was considered within the paper. The issue was solved as stationary (Lei, 2016). The thermophysical properties of solid materials did not depend on temperature.…”

Section: Methods Of Solving Problemmentioning

confidence: 99%

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

Лекомцев¹,

Kang²,

Galkin³

et al. 2020

PTQ

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“…For waxy crude oil seepage flow, effective permeability is a multi-variable function 19 : K e is the effective permeability, 10 –3 μm 2 ; K 0 is the original permeability, 10 –3 μm 2 ; T is the temperature, °C; V c is the cumulative oil flow, PV.…”

Section: Properties Of Crude Oil In the Experimentsmentioning

confidence: 99%

Cold damage from wax deposition in a shallow, low-temperature, and high-wax reservoir in Changchunling Oilfield

Xie

Liang

et al. 2020

Sci Rep

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Wax deposition is an important factor that influences oil production for high-wax crude oilfield. There are few studies on the formation damage by wax deposition, especially cold damage to the shallow low-temperature reservoir. With laboratory tests conducted on reservoir oil and cores of Changchunling Oilfield, this study aims to experimentally investigate the influence of temperature variations on characteristics of oil–water percolation and cold damage mechanisms, as well as the relative permeability of high-wax reservoirs. Experimental results show that seepage flow of high-wax crude is significantly sensitive to temperature-wax deposition evidently increases, whereas the cold damage such as the pore-throat radius and relative permeability sharply decrease with the decline in formation temperature. The research results can be applied to enhance oil recovery of high-viscosity or high-wax oilfields.

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“…Asphaltenes are the heaviest and the most polar components in crude oil, and they are also important components in waxy crude oil (Lei et al 2016). The latest research shows that the presence of asphaltenes has a significant impact on the stratification of wax deposition.…”

Section: Effects Of Asphaltenesmentioning

confidence: 99%

Multifunctional anti-wax coatings for paraffin control in oil pipelines

Bai

2019

Pet. Sci.

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Paraffin deposition is a severe global problem during crude oil production and transportation. To inhibit the formation of paraffin deposits, the commonly used methods are mechanical cleaning, coating the pipe to provide a smooth surface and reduce paraffin adhesion, electric heating, ultrasonic and microbial treatments, the use of paraffin inhibitors, etc. Pipeline coatings not only have the advantages of simple preparation and broad applications, but also maintain a long-term efficient and stable effect. In recent years, important progress has been made in research on pipe coatings for mitigating and preventing paraffin deposition. Several novel superhydrophilic organogel coatings with low surface energy were successfully prepared by bionic design. This paper reviews different types of coatings for inhibiting wax deposition in the petroleum industry. The research prospects and directions of this rapidly developing field are also briefly discussed.

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Effect of the dispersion degree of asphaltene on wax deposition in crude oil under static conditions

Cited by 82 publications

References 23 publications

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

Cold damage from wax deposition in a shallow, low-temperature, and high-wax reservoir in Changchunling Oilfield

Multifunctional anti-wax coatings for paraffin control in oil pipelines

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