A coupled model for CO2 & superheated steam flow in full-length concentric dual-tube horizontal wells to predict the thermophysical properties of CO2 & superheated steam mixture considering condensation

Abstract Acid treatment is an important measure to improve production for horizontal wells of carbonate reservoirs. Acid injection profile of horizontal wells (AIPHWs) is the most critical indicator of the success of the acidification. Currently, most previous works studied AIPHW based on the point source method. However, an inherent singularity exists in the point source solution, and hence, the calculation speed is too slow or the solution does not converge. To solve this problem, a semi-analytical model (coupling the wellbore flow model and reservoir seepage model) by the volumetric source method is presented to determine AIPHW in carbonate reservoirs. In this new coupled model, the permeability heterogeneity, formation contamination, acid-induced wormhole formation, and wellbore pressure drop are all considered. The results of the validations show that the results from the proposed method match well with the model results from the literature. Then, the effects of the acid injection flowrate, acid injection time, and permeability heterogeneity on the AIPHW are studied. According to the sensitivity analysis, we find that the disequilibrium degree of AIPHW becomes stronger as acid injection flowrate increases, acid injection time increases, and permeability heterogeneity coefficient increases. This study provides a guide for the design of horizontal well acidification and the evaluation of acid treatments of horizontal wells in carbonate reservoirs.

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A numerical study of heat transfer effects and aerodynamic noise reduction in superheated steam flow passing a temperature and pressure regulation valve

Numerical Heat Transfer Part A Applications ◽

10.1080/10407782.2020.1746558 ◽

2020 ◽

Vol 77 (10) ◽

pp. 873-889

Author(s):

Jin-yuan Qian ◽

Min-rui Chen ◽

Zhi-jiang Jin ◽

Li-long Chen ◽

Bengt Sundén

Keyword(s):

Heat Transfer ◽

Noise Reduction ◽

Superheated Steam ◽

Numerical Study ◽

Steam Flow ◽

Aerodynamic Noise ◽

Pressure Regulation ◽

Transfer Effects ◽

Heat Transfer Effects ◽

Temperature And Pressure

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Studying the conversion of coals and sludges in superheated steam flow

Thermal Engineering ◽

10.1134/s0040601513120045 ◽

2013 ◽

Vol 60 (12) ◽

pp. 882-888 ◽

Cited By ~ 1

Author(s):

A. R. Bogomolov ◽

M. V. Alekseev ◽

A. L. Sorokin ◽

N. A. Pribaturin ◽

E. I. Kagakin ◽

...

Keyword(s):

Superheated Steam ◽

Steam Flow

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Thermophysical properties of laboratory-prepared corn/wheat dried distillers grains and dried distillers solubles dehydrated with superheated steam and hot air

Drying Technology ◽

10.1080/07373937.2015.1099543 ◽

2015 ◽

Vol 34 (10) ◽

pp. 1147-1161 ◽

Cited By ~ 1

Author(s):

M. Zielinska

Keyword(s):

Thermophysical Properties ◽

Superheated Steam ◽

Distillers Grains ◽

Dried Distillers Grains ◽

Hot Air

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Steam Injection Performance of Horizontal Wells Completed with Slotted Liners

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.423-426.674 ◽

2013 ◽

Vol 423-426 ◽

pp. 674-678 ◽

Cited By ~ 1

Author(s):

Hui Juan Chen ◽

Ming Zhong Li ◽

Yan Yu Zhang ◽

Wei Wei Li

Keyword(s):

Flow Rate ◽

Variable Mass ◽

Horizontal Wells ◽

Steam Injection ◽

Steam Pressure ◽

Steam Flow ◽

Phase Variable ◽

Steam Flow Rate ◽

Horizontal Wellbore ◽

The Impact

Considering the impact of gas-liquid two-phase variable mass flow in horizontal wellbore, combined with the principle of mass, momentum and energy conservation, a simple prediction model was developed to simulate the steam injection performance of horizontal wells completed with slotted liners. Based on the model, the profiles of steam pressure, temperature, quality and flow rate to the reservoir along the slotted horizontal wellbore were studied. The results show the steam pressure, temperature, quality and steam flow rate to the reservoir all gradually drop from the horizontal heel to the toe. However, the decrease of steam pressure and temperature are not so remarkable, but it is conspicuous for steam quality and steam flow rate to the reservoir. It is crucial to develop the techniques to guarantee a uniform flow along the horizontal wellbore.

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