scholarly journals Study on Productivity Model of Herringbone-Like Laterals Wells and Optimization of Morphological Parameters Considering Threshold Pressure Gradient in Heavy Oil Reservoirs

2019 ◽  
Vol 07 (02) ◽  
pp. 302-313
Author(s):  
Enhui Sun ◽  
Jie Tan ◽  
Dong Zhang ◽  
Wei Wang ◽  
Songru Mu
Keyword(s):  
Pressure Gradient ◽  
Heavy Oil ◽  
Oil Reservoirs ◽  
Threshold Pressure ◽  
Morphological Parameters ◽  
Threshold Pressure Gradient ◽  
Heavy Oil Reservoirs

A New Unsteady-State Model for Calculating Oil-Water Relative Permeability of Low-Permeability/Ultra-Low Permeability Reservoirs

2012 ◽  
Vol 616-618 ◽  
pp. 964-969 ◽  
Author(s):  
Yue Yang ◽  
Xiang Fang Li ◽  
Ke Liu Wu ◽  
Meng Lu Lin ◽  
Jun Tai Shi
Keyword(s):  
Porous Media ◽  
Pressure Gradient ◽  
Capillary Pressure ◽  
Relative Permeability ◽  
Oil Reservoirs ◽  
Flow In Porous Media ◽  
Low Permeability ◽  
Threshold Pressure ◽  
Flow Process ◽  
Threshold Pressure Gradient

Oil and water relative permeabilities are main coefficients in describing the fluid flow in porous media; however, oil and water relative permeability for low - ultra low perm oil reservoir can not be obtained from present correlations. Based on the characteristics of oil and water flow in porous media, the model for calculating the oil and water relative permeability of low and ultra-low perm oil reservoirs, which considering effects of threshold pressure gradient and capillary pressure, has been established. Through conducting the non-steady oil and water relative permeability experiments, oil and water relative permeability curves influenced by different factors have been calculated. Results show that: the threshold pressure gradient more prominently affects the oil and water relative permeability; capillary pressure cannot influence the water relative permeability but only the oil relative permeability. Considering effects of threshold pressure gradient and capillary pressure yields the best development result, and more accordant with the flow process of oil and water in low – ultra low perm oil reservoirs.

Effect of dynamic pseudo threshold pressure gradient on well production performance in low-permeability and tight oil reservoirs

2019 ◽  
Vol 173 ◽  
pp. 69-76 ◽  
Author(s):  
Mingda Dong ◽  
Xiang'an Yue ◽  
Xuedong Shi ◽  
Shengcai Ling ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Production Performance ◽  
Oil Reservoirs ◽  
Low Permeability ◽  
Tight Oil ◽  
Threshold Pressure ◽  
Threshold Pressure Gradient ◽  
Well Production ◽  
Tight Oil Reservoirs

A fractal model for threshold pressure gradient of tight oil reservoirs

2019 ◽  
Vol 179 ◽  
pp. 427-431 ◽  
Author(s):  
Wenzhuo Ye ◽  
Xiuyu Wang ◽  
Chenguang Cao ◽  
Wenshuai Yu
Keyword(s):  
Pressure Gradient ◽  
Fractal Model ◽  
Oil Reservoirs ◽  
Tight Oil ◽  
Threshold Pressure ◽  
Threshold Pressure Gradient ◽  
Tight Oil Reservoirs

Effect of Asphaltene on Threshold Pressure Gradient of Heavy Oil in Porous Media

2021 ◽  
Vol 13 (2) ◽  
pp. 273-279
Author(s):  
Guishan Li ◽  
Xiankang Xin ◽  
Gaoming Yu ◽  
Yadi Gu ◽  
Qiong Wu ◽  
...  
Keyword(s):  
Porous Media ◽  
Pressure Gradient ◽  
Heavy Oil ◽  
High Viscosity ◽  
Threshold Pressure ◽  
Heavy Oils ◽  
Oil Viscosity ◽  
Threshold Pressure Gradient ◽  
Asphaltene Content ◽  
Effective Development

Many studies have shown that heavy oil with high asphaltene content has a yield stress. Coupled with the solid-liquid interaction between porous media and heavy oil, there is a threshold pressure gradient when heavy oil flows in porous media. Meanwhile, some previous research has indicated that the high viscosity of heavy oil is the decisive factor for its threshold pressure gradient. Hence, this concept needs more clarification, especially because its accuracy is questionable. In this research, different oil samples with the same viscosity and also different asphaltene contents heavy oil samples were prepared. The viscosity of the different heavy oil samples was measured. Threshold pressure gradient experiments under different permeabilities and temperatures were also conducted on heavy oils. The results proved that the viscosity was not directly related to threshold pressure gradient of heavy oil. They also suggested that the heavy oil viscosity increased with the increase of asphaltene content. Moreover, the formula of the factors affecting threshold pressure gradient was regressed, and also its applicability was verified. As the temperature and core permeability increase, the threshold pressure gradient was also proven to decrease significantly. Furthermore, it was found that the threshold pressure gradient increased significantly with the increase of asphaltene content. Therefore, the heavy oil threshold pressure gradient could be characterized as a function of temperature, permeability, and asphaltene content. This study provided some theoretical support for the research attempts on the reduction of threshold pressure gradient and also on the effective development of heavy oil reservoirs.

scholarly journals Threshold pressure experiment of liquid flows through nanochannels and tight cores

2021 ◽  
Vol 2076 (1) ◽  
pp. 012028
Author(s):  
Jiajia Xiao ◽  
Fuquan Song ◽  
Jingjing Jiang ◽  
Guanghao Liu ◽  
Lingyun Wang
Keyword(s):  
Pressure Gradient ◽  
Oil Reservoirs ◽  
Threshold Pressure ◽  
Threshold Pressure Gradient ◽  
Factors Affecting ◽  
The Core ◽  
Macro Scale ◽  
Pressure Experiment ◽  
Main Factors ◽  
Liquid Flows

Abstract Compared with low-permeability oil reservoirs, tight oil reservoirs have more nanopores, complex pore structure, and more obvious nonlinear seepage characteristics. Under the macro-scale channel flow, the influence of micro-forces is often ignored, but micro-forces of the micro-nano-scale have become the main factors affecting the flow. The micro-nano-scale flow is different from the macro-scale flow, and the flow requires the force between the fluid and the micro-nano tubes. The article conducts the threshold pressure experiment of nanochannels and cores, and results show that exists a pressure threshold under liquid flows through nanochannels and cores. The influence of the threshold pressure gradient in the micro-nanochannels is analyzed, and it is found that the nature of the fluid and the diameter of the pores affect the threshold pressure of micro the tube; core experiments prove the threshold pressure gradient exists in the core. The main factors affecting the threshold pressure gradient of the core are the permeability of the core and the nature of the experimental fluid.

scholarly journals Numerical Simulation Study on Waterflooding Heavy Oil Based on Variable Threshold Pressure Gradient

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Fan Liu ◽  
Qingdong Ni ◽  
Chunguang Zhang ◽  
Wensheng Zhou ◽  
Jingqi Lin ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Pressure Gradient ◽  
Simulation Study ◽  
Heavy Oil ◽  
Fluid Viscosity ◽  
Threshold Pressure ◽  
Threshold Pressure Gradient ◽  
Variable Threshold ◽  
Oil Flow ◽  
Phase Mobility

The heavy-oil flow in porous media is characterized by non-Darcy law with variable threshold pressure gradient (TPG) due to the large fluid viscosity. However, available analytical and numerical models hardly consider this effect, which can lead to erroneous results. This paper is aimed at presenting an innovative approach and establishing a numerical simulator to analyze the heavy-oil flow behavior with waterflooding. The apparent viscosity of the oil phase and flow correction coefficient characterized by the TPG were applied to describe the viscosity anomaly of heavy oil. Considering the formation heterogeneity, the TPG was processed into a variable related to mobility and the directionality. The discretization and linearization of the mathematical model were conducted to establish a fully implicit numerical model; the TPG value on each grid node was obtained through oil phase mobility interpolation, and then, the Jacobi matrix was reassembled and calculated to solve pressure and saturation equations. The corresponding simulator was thus developed. The pre-/postprocessing module of the simulator is connected to ECLIPSE; then, an efficient algorithm is introduced to realize a fast solution. Results show that considering the TPG will not only reduce the waterflooding area but also reduce the oil displacement efficiency because of aggravating the nonpiston phenomenon and interlayer conflict. The numerical simulation study on the TPG of heavy oil provides theoretical and technical support for the rational development and adjustment of water-driven heavy oil.

Predictive models of dual horizontal well SAGD for thin formation and super heavy oil reservoirs

2015 ◽  
Vol 32 (5) ◽  
pp. 473
Author(s):  
Chuanfei Wang ◽  
Guanghuan Wu ◽  
Tao Wei ◽  
Weizhong Li
Keyword(s):  
Heavy Oil ◽  
Predictive Models ◽  
Horizontal Well ◽  
Oil Reservoirs ◽  
Heavy Oil Reservoirs

Experimental study and numerical simulation of urea-assisted SAGD in developing exra-heavy oil reservoirs

2021 ◽  
Vol 201 ◽  
pp. 108436
Author(s):  
Daode Hua ◽  
Pengcheng Liu ◽  
Peng Liu ◽  
Changfeng Xi ◽  
Shengfei Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Heavy Oil ◽  
Oil Reservoirs ◽  
Heavy Oil Reservoirs
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