Computational Method for Hydraulic Fractures Spacing of Multi-Fractured Horizontal Well in Ultra Low Permeability Reservoirs

2016 ◽  
Author(s):  
Hao Mingqiang ◽  
Hu Yongle ◽  
Zheng Xingfan
Keyword(s):  
Horizontal Well ◽  
Computational Method ◽  
Hydraulic Fractures ◽  
Low Permeability ◽  
Fractured Horizontal Well ◽  
Low Permeability Reservoirs

scholarly journals PRODUCTIVITY PREDICTION OF FRACTURED HORIZONTAL WELLS WITH LOW PERMEABILITY FLOW CHARACTERISTICS

2019 ◽  
Vol 27 (2) ◽  
pp. 82-92
Author(s):  
Wen Jing ◽  
Luo Wei ◽  
Yin Qingguo ◽  
Wang Hongying ◽  
He Yongming ◽  
...  
Keyword(s):  
Large Scale ◽  
Horizontal Well ◽  
Superposition Principle ◽  
Economic Benefits ◽  
Low Permeability ◽  
Fractured Horizontal Well ◽  
Proposed Model ◽  
Seepage Model ◽  
Productivity Prediction ◽  
Low Permeability Reservoirs

Horizontal well and large-scale fracturing are revolutionary technologies in petroleum industry. The technologies bring obvious economic benefits to exploiting unconventional oil and gas reservoirs with low permeability, ultra-low permeability and shale gas. With the increasingly extensive application of these technologies, other correlated technologies have also gained great development. However, low-permeability reservoirs exhibit complicated features and horizontal well fractures have complex shape. The existing methods for the productivity prediction of fractured horizontal well in low-permeability reservoirs rarely consider the influencing factors in a comprehensive manner. In this paper, a horizontal well seepage model of casing fracturing completion was established according to the superposition principle of low-permeability reservoir and the relationship between potential and pressure, by which model the seepage characteristics of low-permeability reservoirs could be fully described. Based on the established new seepage model, a new targeted model with coupling seepage and wellbore flow was established for the productivity prediction of low-permeability fractured horizontal well. Finally, the new targeted model was verified through field experiment. The experimental results confirmed the reliability of productivity prediction by the proposed model. Sensitivity analysis was then performed on the parameters in the proposed model.

scholarly journals Nonlinear Flow Characteristics and Horizontal Well Pressure Transient Analysis for Low-Permeability Offshore Reservoirs

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Jianchun Xu ◽  
Ruizhong Jiang ◽  
Wenchao Teng
Keyword(s):  
Horizontal Well ◽  
Flow Characteristics ◽  
Stress Sensitivity ◽  
Nonlinear Flow ◽  
Absolute Permeability ◽  
Low Permeability ◽  
Threshold Pressure Gradient ◽  
Pressure Transient ◽  
Permeability Modulus ◽  
Low Permeability Reservoirs

Threshold pressure gradient (TPG) and stress sensitivity which cause the nonlinear flow in low permeability reservoirs were carried out by experiments. Firstly, the investigation of existing conditions of TPG for oil flow in irreducible water saturation low-permeability reservoirs was conducted and discussed, using the cores from a real offshore oilfield in China. The existence of TPG was proven. The relationship between TPG and absolute permeability was obtained by laboratory tests. TPG increases with decreasing absolute permeability. Then, stress sensitivity experiment was carried out through depressurizing experiment and step-up pressure experiment. Permeability modulus which characterizes stress sensitivity increases with decreasing absolute permeability. Consequently, a horizontal well pressure transient analysis mathematical model considering threshold pressure gradient and stress sensitivity was established on the basis of mass and momentum conservation equations. The finite element method (FEM) was presented to solve the model. Influencing factors, such as TPG, permeability modulus, skin factor, wellbore storage, horizontal length, horizontal position, and boundary effect on pressure and pressure derivative curves, were also discussed. Results analysis demonstrates that the pressure transient curves are different from Darcy’s model when considering the nonlinear flow characteristics. Both TPG and permeability modulus lead to more energy consumption and the reservoir pressure decreases more than Darcy’s model.

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