Transient Production Decline Behavior Analysis for a Multi-Fractured Horizontal Well With Discrete Fracture Networks in Shale Gas Reservoirs

Wei, Mingqiang; Duan, Yunlong; Dong, Mingzhe; Fang, Quantang; Dejam, Morteza

doi:10.1615/jpormedia.2019028982

Cited by 66 publications

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“…With the world's increasing need for energy and the gradual decline of conventional oil and gas production, attention has been turned toward unconventional reservoirs such as shale oil and shale gas [1]. Resources in tight reservoirs are substantial worldwide.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice

Wang

et al. 2019

Energies

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The Chang 7 reservoir in Changqing oilfield is rich in tight oil. However, due to the low formation permeability, it is very difficult to obtain economical oil production without stimulation treatments. Volume fracturing seems to be a more efficient tight oil recovery enhancement (EOR) method in Chang 7 pilot tests compared with conventional hydraulic fracturing. In this study, Chang 7 tight oil reservoir was first characterized by its geological property, hydrocarbon source rock distribution, and formation physiochemical property. Tight core flooding tests were then conducted to experimentally investigate the EOR ability of the volume fracturing technique. The field-scale practice was also demonstrated and analyzed. The results show that Chang 7 reservoir is favorable for the generation of a large amount of tight oil. Fractures created in tight cores can significantly improve the fluid flow conductivity and enhance the imbibition of displacing water, resulting in a greater tight oil recovery increment. Volume fracturing is an effective way to generate a larger number of fractures. Field application indicates that volume fracturing treatment can form a much greater reservoir stimulation volume. Daily oil production in the volume-fracturing-treated wells can be more than twice as high as that in the conventional-fracturing-treated wells.

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Section: Introductionmentioning

confidence: 99%

Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice

Wang

et al. 2019

Energies

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“…9 Horizontal well multistage fracturing technology can stimulate the formation and increase the reservoir contact significantly. [10][11][12][13][14] Tight reservoirs usually contain natural fractures, which lead to strong reservoir heterogeneity. Therefore, we must accurately model the complex flow of both hydraulic fractures and natural fractures with multiple orientations, lengths, and conductivities.…”

Section: Introductionmentioning

confidence: 99%

“…8 In recent years, with the application of horizontal wells and hydraulic fracturing technology, the production of tight oil has been greatly improved. [10][11][12][13][14] Tight reservoirs usually contain natural fractures, which lead to strong reservoir heterogeneity. [10][11][12][13][14] Tight reservoirs usually contain natural fractures, which lead to strong reservoir heterogeneity.…”

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confidence: 99%

Simulation of a multistage fractured horizontal well in a tight oil reservoir using an embedded discrete fracture model

Zhao

Liu

Zhang

et al. 2019

Energy Science & Engineering

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As an unconventional resource, tight oil reservoirs hold abundant geological reserves and great development potential. However, tight oil reservoirs suffer from high heterogeneity and low permeability. To obtain commercial oil and gas flow, multistage hydraulically fractured horizontal well technology is often adopted. In this paper, an embedded discrete fracture model (EDFM) is adopted to study the fractured reservoir. First, the relationship between the EDFM connection list is studied and its coefficient matrix of the equation system is solved. EDFM connection list is a method to record the connections between the grids. Thereafter, the reasons for the sparsity of the coefficient matrix and the symmetry of the locations of nonzero elements in the matrix are explained, and a simple method to establish and assemble the coefficient matrix is proposed. Using this method, a simulator for tight oil reservoir with EDFM is developed. By comparing the simulation results of the self‐programming simulator with the commercial software SAPHIR, the usefulness of the simulator is verified. Finally, several simulations and sensitivity analysis are performed to determine the key factors affecting production. Modeling studies show the influence of fractures, the horizontal well, and stress sensitivity, providing very useful information for the design of hydraulic fracturing and production development programs.

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“…A key factor limiting the development of unconventional oil and gas is the evaluation of reservoir permeability. One method is to obtain reservoir permeability through well testing and rate transient analysis [1][2][3]. This method needs to solve the unsteady flow of wells under constant bottom hole pressure or constant production rate conditions.…”

Section: Introductionmentioning

confidence: 99%

Differences in Performance of Models for Heterogeneous Cores during Pulse Decay Tests

et al. 2019

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Shale and fractured cores often exhibit dual-continuum medium characteristics in pulse decay testing. Dual-continuum medium models can be composed of different flow paths, interporosity flow patterns, and matrix shapes. Various dual-continuum medium models have been used by researchers to analyze the results of pulse decay tests. But the differences in their performance for pulse decay tests have not been comprehensively investigated. The characteristics of the dual-permeability model and the dual-porosity model, the slab matrix, and the spherical matrix in pulse decay testing are compared by numerical modeling in this study. The pressure and pressure derivative curves for different vessel volumes, storativity ratios, interporosity flow coefficients, and matrix-fracture permeability ratios were compared and analyzed. The study found that these models have only a small difference in the interporosity flow stage, and the difference in the matrix shape is not important, and the matrix shape cannot be identified by pulse decay tests. When the permeability of the low permeability medium is less than 1% of the permeability of the high permeability medium, the difference between the dual-permeability model and the dual-porosity model can be ignored. The dual-permeability model approaches the pseudo-steady-state model as the interporosity flow coefficient and vessel volume increase. Compared with the dual-porosity model, the dual-permeability model has a shorter horizontal section of the pressure derivative in the interporosity flow stage. Finally, the conclusions were verified against a case study. This study advances the ability of pulse decay tests to investigate the properties of unconventional reservoir cores.

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Transient Production Decline Behavior Analysis for a Multi-Fractured Horizontal Well With Discrete Fracture Networks in Shale Gas Reservoirs

Cited by 66 publications

References 0 publications

Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice

Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice

Simulation of a multistage fractured horizontal well in a tight oil reservoir using an embedded discrete fracture model

Differences in Performance of Models for Heterogeneous Cores during Pulse Decay Tests

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