A New Methodology to Forecast Solution Gas Production in Tight Oil Reservoirs

2014 ◽  
Author(s):  
Shaoyong Yu
Keyword(s):  
Gas Production ◽  
Oil Reservoirs ◽  
Tight Oil ◽  
Tight Oil Reservoirs ◽  
Solution Gas

scholarly journals Physical Simulation and Mathematical Model of the Porous Flow Characteristics of Gas-Bearing Tight Oil Reservoirs

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3121
Author(s):  
Yuan Rao ◽  
Zhengming Yang ◽  
Yapu Zhang ◽  
Zhenkai Wu ◽  
Yutian Luo ◽  
...  
Keyword(s):  
Oil Reservoirs ◽  
Tight Oil ◽  
Production Well ◽  
Porous Flow ◽  
Bubble Point ◽  
Bubble Point Pressure ◽  
Point Pressure ◽  
Tight Oil Reservoirs ◽  
Gas Bearing ◽  
Solution Gas

The separation of solution gas has great influence on the development of gas-bearing tight oil reservoirs. In this study, physical simulation and high-pressure mercury intrusion were used to establish a method for determining the porous flow resistance gradient of gas-bearing tight oil reservoirs. A mathematical model suitable for injection–production well networks is established based on the streamline integral method. The concept of pseudo-bubble point pressure is proposed. The experimental results show that as the back pressure decreases from above the bubble point pressure to below the bubble point pressure, the solution gas separates out. During this process, the porous flow resistance gradient is initially equal to the threshold pressure gradient of the oil single-phase fluid, then it becomes relatively small and stable, and finally it increases rapidly and exponentially. The lower the permeability, the higher the pseudo-bubble point pressure, and the higher the resistance gradient under the same back pressure. For tight reservoirs, the production pressure should be maintained above the pseudo-bubble point pressure when the permeability is lower than a certain value. When the permeability is higher than a certain value, the pressure can be reduced below the pseudo-bubble point pressure, and there is a reasonable range. The mathematical results show that after degassing, the oil production rate and the effective utilization coefficient of oil wells decline rapidly. These declines occur later and have a flat trend for high permeability formations, and the production well pressure can be reduced to a lower level. Fracturing can effectively increase the oil production rate after degassing. A formation that cannot be utilized before fracturing because of the blocked throats due to the separation of the solution gas can also be utilized after fracturing. When the production well pressure is lower than the bubble point pressure, which is not too large, the fracturing effect is better.

scholarly journals Porous flow characteristics of solution-gas drive in tight oil reservoirs

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 412-418
Author(s):  
Xiao Qianhua ◽  
Wang Zhiyuan ◽  
Yang Zhengming ◽  
Liu Xuewei ◽  
Wei Yunyun
Keyword(s):  
Flow Resistance ◽  
Material Balance ◽  
Oil Reservoirs ◽  
Tight Oil ◽  
Porous Flow ◽  
Drainage Radius ◽  
Solution Gas Drive ◽  
Tight Oil Reservoirs ◽  
Gas Drive ◽  
Solution Gas

Abstract The variation of porous flow resistance of solution-gas drive for tight oil reservoirs has been studied by designing new experimental equipment. The results show that the relation between the porous flow resistance gradient and pressure is the exponential function. The solution-gas driving resistance is determined by a combination of factors, such as the gas-oil ratio, density, viscosity, permeability, porosity and the Jamin effect. Based on the material balance and the flow resistance gradient equation, a new governing equation for solution-gas drive is established. After coupling with the nonlinear equation of elastic drive, the drainage radius of solution-gas drive is found to be very small and decreases rapidly when the bottom-hole pressure approaches the bubble-point value. Pressure distribution of the solution-gas drive is non-linear, and the values decrease sharply as it approaches the well bore. The productivity is rather low despite being strongly influenced by permeability. Therefore, stimulated reservoir volume (SRV) is the essential measure taken for effective development for tight oil reservoirs.

scholarly journals Stimulation and Sequestration Mechanism of CO2 Waterless Fracturing for Continental Tight Oil Reservoirs

ACS Omega ◽  
2021 ◽  
Author(s):  
Jiaping Tao ◽  
Siwei Meng ◽  
Xu Jin ◽  
Jianguo Xu ◽  
Qinghai Yang ◽  
...  
Keyword(s):  
Oil Reservoirs ◽  
Tight Oil ◽  
Tight Oil Reservoirs ◽  
Waterless Fracturing

Numerical modeling of fluid flow in tight oil reservoirs considering complex fracturing networks and Pre-Darcy flow

2021 ◽  
Vol 207 ◽  
pp. 109050
Author(s):  
Linkai Li ◽  
Xiao Guo ◽  
Ming Zhou ◽  
Zhangxin Chen ◽  
Lin Zhao ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Fluid Flow ◽  
Oil Reservoirs ◽  
Darcy Flow ◽  
Tight Oil ◽  
Tight Oil Reservoirs
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