Effect of Multi-Stage Hydraulic Fractures on Performance of Naturally Fractured Tight Oil Reservoirs with Bottom-Water

2018 ◽  
Author(s):  
Samir Prasun ◽  
Ali Ghalambor
Keyword(s):  
Bottom Water ◽  
Oil Reservoirs ◽  
Hydraulic Fractures ◽  
Tight Oil ◽  
Multi Stage ◽  
Naturally Fractured ◽  
Tight Oil Reservoirs

scholarly journals A Semianalytical Approach for Production of Oil from Bottom Water Drive Tight Oil Reservoirs with Complex Hydraulic Fractures

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Shuhui Dai ◽  
Chunqiang Chen ◽  
Hao Wang ◽  
Zhaohui Fu ◽  
Dameng Liu
Keyword(s):  
Bottom Water ◽  
Oil Production ◽  
Oil Reservoirs ◽  
Hydraulic Fractures ◽  
Tight Oil ◽  
Matrix Permeability ◽  
Cumulative Production ◽  
Tight Reservoirs ◽  
Tight Oil Reservoirs ◽  
Half Length

In order to improve the recovery rate, fractured horizontal wells are widely used in tight reservoirs. In general, a complex fracture system is generated in tight reservoirs to improve oil production. Based on the fractal theory, a semianalytical model is presented to simulate a complex fracture system by using the volumetric source method and superposition principle, and the solutions are determined iteratively. The reliability of this model is validated through numerical simulation (Eclipse 2011); it shows that the result from this method is identical with that from the numerical simulation. The study on influence factors of this model was focused on matrix permeability, fractal dimension, and half-length of main fracture. The results show that (1) the production increases with the increase of half-length of main fracture and matrix permeability during the initial production stage, but the production difference becomes smaller in different half-length of main fractures and matrix permeability in middle and later stages and (2) the cumulative production increases with the increase of fractal dimension, and the increments of cumulative production in different fractal dimensions gradually increase during the initial production stage, but the increments tend to be stable in middle and later stages. This study can be used for forecasting the oil production from bottom water tight oil reservoirs with complex hydraulic fractures. It can also guide in optimization of horizontal well fracturing design to improve oil production and oil recovery in bottom water tight oil reservoirs.

scholarly journals Numerical Simulation of a Horizontal Well With Multi-Stage Oval Hydraulic Fractures in Tight Oil Reservoir Based on an Embedded Discrete Fracture Model

2020 ◽  
Vol 8 ◽  
Author(s):  
Zhi-dong Yang ◽  
Yong Wang ◽  
Xu-yang Zhang ◽  
Ming Qin ◽  
Shao-wen Su ◽  
...  
Keyword(s):  
Oil Reservoirs ◽  
Hydraulic Fractures ◽  
Tight Oil ◽  
Fine Grid ◽  
Hole Pressure ◽  
Bottom Hole Pressure ◽  
Bottom Hole ◽  
Discrete Fracture ◽  
Fracture Models ◽  
Tight Oil Reservoirs

Tight oil is a kind of unconventional oil and gas resource with great development potential. Due to the unconventional characteristics of low porosity and low permeability in tight oil reservoirs, single wells generally have no natural productivity, and industrial development is usually conducted in combination with horizontal wells and hydraulic fracturing techniques. To capture the flow behavior affected by fractures with complex geometry and interaction, we adopted embedded discrete fracture models (EDFMs) to simulate the development of fractured reservoirs. Compared with the traditional discrete fracture models (DFMs), the embedded discrete fracture models (EDFMs) can not only accurately represent the fracture geometry but also do not generate a large number of refine grids around fractures and intersections of fractures, which shows the high computational efficiency. To be more consistent with the real characteristic of the reservoir and reflect the advantage of EDFMs on modeling complex fractures, in this work, the hydraulic fractures are set as oval shape, and we adopted 3-dimensional oil–gas two-phase model considering capillary forces and gravity effects. We developed an EDFM simulator, which is verified by using the fine grid method (FGM). Finally, we simulated and studied the development of tight oil without and with random natural fractures (NFs). In our simulation, the pressure varies widely from the beginning to the end of the development. In real situation, tight oil reservoirs have high initial pressure and adopt step-down bottom hole pressure development strategy where the bottom hole pressure of the last stage is below the bubble point pressure and the free gas appears in the reservoir. Modeling studies indicate that the geometry of fracture has a great influence on the pressure and saturation profiles in the area near the fractures, and dissolved gas flooding contributes to the development of tight oil, and NFs can significantly improve production, while the effect of the stress sensitivity coefficient of NFs on production is more significant in the later stage of production with lower reservoir pressure.

Compositional simulation of CO2 Huff-n-Puff process in Middle Bakken tight oil reservoirs with hydraulic fractures

Fuel ◽  
2019 ◽  
Vol 236 ◽  
pp. 1446-1457 ◽  
Author(s):  
Runxuan Sun ◽  
Wei Yu ◽  
Feng Xu ◽  
Hui Pu ◽  
Jijun Miao
Keyword(s):  
Oil Reservoirs ◽  
Hydraulic Fractures ◽  
Tight Oil ◽  
Compositional Simulation ◽  
Tight Oil Reservoirs

Multi-Stage Fracturing Stimulations Improve Well Performance in Tight Oil Reservoirs of the Changqing Oilfield

2008 ◽  
Author(s):  
Xianwen Li ◽  
Hongmei Wei ◽  
Baochun Chen ◽  
Xinghui Liu ◽  
Wangcheng Wang ◽  
...  
Keyword(s):  
Oil Reservoirs ◽  
Tight Oil ◽  
Well Performance ◽  
Multi Stage ◽  
Tight Oil Reservoirs

scholarly journals A Semianalytical Model for Multiple-Fractured Horizontal Wells with SRV in Tight Oil Reservoirs

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Jiahang Wang ◽  
Xiaodong Wang ◽  
Wenxiu Dong
Keyword(s):  
Great Influence ◽  
Horizontal Wells ◽  
Oil Reservoirs ◽  
Nonlinear Flow ◽  
Hydraulic Fractures ◽  
Tight Oil ◽  
Transient Pressure ◽  
Type Curves ◽  
Tight Oil Reservoirs ◽  
Fractured Horizontal Wells

The paper developed a new semianalytical model for multiple-fractured horizontal wells (MFHWs) with stimulated reservoir volume (SRV) in tight oil reservoirs by combining source function theory with boundary element idea. The model is first validated by both analytical and numerical model. Then new type curves are established. Finally, the effects of SRV shape, SRV size, SRV permeability, and parameters of hydraulic fractures are discussed. Results show that SRV has great influence on the pressure response of MFHWs; the parameters of fractures, such as fracture distribution, length, and conductivity, also can affect the transient pressure of MFHWs. One novelty of this model is to consider the nonlinear flow around hydraulic fracture tips. The other novelty is the ability to model the shape of the SRV, production behavior of different fractures, and interfaces. Compared to numerical and analytic methods, this model can not only reduce extensive computing processing but also show high accuracy.

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