Evaluation of Transient Pressure Responses of a Hydraulically Fractured Horizontal Well in a Tight Reservoir with an Arbitrary Shape by Considering Stress-Sensitive Effect

Summary Non-Darcy flow and the stress-sensitivity effect are two fundamental issues that have been widely investigated in transient pressure analysis for fractured wells. The main object of this work is to establish a semianalytical solution to quantify the combined effects of non-Darcy flow and stress sensitivity on the transient pressure behavior for a fractured horizontal well in a naturally fractured reservoir. More specifically, the Barree-Conway model is used to quantify the non-Darcy flow behavior in the hydraulic fractures (HFs), while the permeability modulus is incorporated into mathematical models to take into account the stress-sensitivity effect. In this way, the resulting nonlinearity of the mathematical models is weakened by using Pedrosa's transform formulation. Then a semianalytical method is applied to solve the coupled nonlinear mathematical models by discretizing each HF into small segments. Furthermore, the pressure response and its corresponding derivative type curve are generated to examine the combined effects of non-Darcy flow and stress sensitivity. In particular, stress sensitivity in HF and natural-fracture (NF) subsystems can be respectively analyzed, while the assumption of an equal stress-sensitivity coefficient in the two subsystems is no longer required. It is found that non-Darcy flow mainly affects the early stage bilinear and linear flow regime, leading to an increase in pressure drop and pressure derivative. The stress-sensitivity effect is found to play a significant role in those flow regimes beyond the compound-linear flow regime. The existence of non-Darcy flow makes the effect of stress sensitivity more remarkable, especially for the low-conductivity cases, while the stress sensitivity in fractures has a negligible influence on the early time period, which is dominated by non-Darcy flow behavior. Other parameters such as storage ratio and crossflow coefficient are also analyzed and discussed. It is found from field applications that the coupled model tends to obtain the most-reasonable matching results, and for that model there is an excellent agreement between the measured and simulated pressure response.

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Pressure Transient Performance for a Horizontal Well Intercepted by Multiple Reorientation Fractures in a Tight Reservoir

Energies ◽

10.3390/en12224232 ◽

2019 ◽

Vol 12 (22) ◽

pp. 4232 ◽

Cited By ~ 1

Author(s):

Guoqiang Xing ◽

Shuhong Wu ◽

Jiahang Wang ◽

Mingxian Wang ◽

Baohua Wang ◽

...

Keyword(s):

Horizontal Well ◽

Flow Behavior ◽

Flow Equation ◽

Finite Conductivity ◽

Transient Pressure ◽

Pressure Derivative ◽

Fracture Conductivity ◽

Fracture Spacing ◽

Economic Production ◽

Tight Reservoir

A fractured horizontal well is an effective technology to obtain hydrocarbons from tight reservoirs. In this study, a new semi-analytical model for a horizontal well intercepted by multiple finite-conductivity reorientation fractures was developed in an anisotropic rectangular tight reservoir. Firstly, to establish the flow equation of the reorientation fracture, all reorientation fractures were discretized by combining the nodal analysis technique and the fracture-wing method. Secondly, through coupling the reservoir solution and reorientation fracture solution, a semi-analytical solution for multiple reorientation fractures along a horizontal well was derived in the Laplace domain, and its accuracy was also verified. Thirdly, typical flow regimes were identified on the transient-pressure curves. Finally, dimensionless pressure and pressure derivative curves were obtained to analyze the effect of key parameters on the flow behavior, including fracture angle, permeability anisotropy, fracture conductivity, fracture spacing, fracture number, and fracture configuration. Results show that, for an anisotropic rectangular tight reservoir, horizontal wells should be deployed parallel to the direction of principal permeability and fracture reorientation should be controlled to extend along the direction of minimum permeability. Meanwhile, the optimal fracture number should be considered for economic production and the fracture spacing should be optimized to reduce the flow interferences between reorientation fractures.

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Modeling Transient Pressure Behaviour of a Multi-fractured Horizontal Well in a Reservoir with an Arbitrary Boundary and Different Fracture Networks by Considering Stress-sensitive Effect

Journal of Hydrology ◽

10.1016/j.jhydrol.2021.126552 ◽

2021 ◽

pp. 126552

Author(s):

Yunhao Zhang ◽

Daoyong Yang

Keyword(s):

Horizontal Well ◽

Fracture Networks ◽

Transient Pressure ◽

Arbitrary Boundary ◽

Fractured Horizontal Well

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Transient pressure behaviour of multi-stage fractured horizontal well in stress-sensitive coal seam

International Journal of Oil Gas and Coal Technology ◽

10.1504/ijogct.2019.10024396 ◽

2019 ◽

Vol 22 (2) ◽

pp. 163

Author(s):

Yang Hongbin ◽

Yao Ze ◽

Lou Erbiao ◽

Jiang Huayi ◽

Zhang Jiaming ◽

...

Keyword(s):

Coal Seam ◽

Horizontal Well ◽

Transient Pressure ◽

Multi Stage ◽

Fractured Horizontal Well

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Optimization of Fracture Parameters for Hydraulic Fractured Horizontal Well in a Heterogeneous Tight Reservoir: An Equivalent Homogeneous Modelling Approach

10.2118/198185-ms ◽

2019 ◽

Author(s):

Omar Al-Fatlawi ◽

Mofazzal Hossain ◽

Asaad Essa

Keyword(s):

Horizontal Well ◽

Fracture Parameters ◽

Fractured Horizontal Well ◽

Tight Reservoir ◽

Modelling Approach

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Flow Modeling of Well Test Analysis for a Multiple-fractured Horizontal Well in Triple Media Carbonate Reservoir

International Journal of Nonlinear Sciences and Numerical Simulation ◽

10.1515/ijnsns-2016-0075 ◽

2018 ◽

Vol 19 (5) ◽

pp. 439-457 ◽

Cited By ~ 24

Author(s):

Yong Wang ◽

Xiangyi Yi

Keyword(s):

Horizontal Well ◽

Outer Boundary ◽

Superposition Principle ◽

Horizontal Wells ◽

Carbonate Reservoir ◽

Well Test ◽

Transient Pressure ◽

Well Test Analysis ◽

Fractured Horizontal Well ◽

Fractured Horizontal Wells

AbstractCarbonate reservoir is one kinds of important reservoir in the world. Because of the characteristics of carbonate reservoir, horizontal well, and acid fracturing became a key technology for efficiently developing carbonate reservoir. Establishing corresponding mathematical models and analyzing transient pressure behaviors of this type of well-reservoir configuration can provide a better understanding of fluid flow patterns in formation as well as estimations of important parameters. A coupling mathematical model for a fractured horizontal well in triple media carbonate reservoir with three kinds of reservoir outer boundaries by conceptualizing vugs as spherical shapes is presented in this article, in which the infinite conductivity of the acid fractures is taken into account. A semi-analytical solution is obtained in the Laplace domain by using source function theory, Laplace transformation, discretization of fracture, and superposition principle. Analysis of transient pressure responses indicates that several characteristic flow periods of fractured horizontal wells in triple media carbonate reservoir can be identified. Parametric analysis shows that fracture half-length, fracture number, fracture spacing, conditions of reservoir outer boundary, and so on can significantly influence the transient pressure responses of fractured horizontal wells in triple media carbonate reservoir. The model presented in this article can be applied to obtain important parameters pertinent to reservoir or fracture by type curve matching, and it can also provide useful information for optimizing fracture parameters.

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