Analyzing Pressure Interference Between Horizontal Wells During Fracturing

Seth, Puneet; Manchanda, R.; Kumar, Ashish; Sharma, Mukul M.

doi:10.1016/j.petrol.2021.108696

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…where σ is the effective stress matrix, Pa; p w denotes the fluid pore pressure, Pa; δε is the virtual strain rate matrix, s −1 ; δv represents the virtual velocity vector, m/s; t is the surface force vector, N/m 2 ; f is the physical force vector, N/m 3 . The fluid flow process of fracturing conforms to the law of porous media, and the mass balance of fluid in rock can be expressed by equation (2). Assuming that the fluid flow law satisfies Darcy's law, the seepage velocity and pore pressure gradient satisfy the following equation (3):…”

Section: Mathematical Frameworkmentioning

confidence: 99%

“…Unconventional oil and gas resources, such as tight oil and gas that are pervasively recognized as an essential energy supplement, are significant in ensuring the balance of supply and demand in energy structure [1]. In the past few decades, horizontal wells and multistage hydraulic fracturing have played an indispensable role in the efficient development of unconventional oil reservoirs [2,3]. The Mahu oilfield in the Junggar Basin is a super-large tight conglomerate oilfield with reserves of 1 billion tons.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, this paper establishes a numerical model of extended finite element fracturing fractures. Based on the field data, the characterization of subcluster fractures is carried out, the dynamic process of fracturing network 2 Geofluids formation with stress interference is analyzed, and the effect of different cluster spacing and stage spacing on fractures is quantified. The interference effect provides a theoretical basis for subsequent horizontal well fracturing in the Mahu sandy conglomerate reservoir.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stress Interferences between Fractures and Fracturing Stages of a Horizontal Well in a Sandy Conglomerate Reservoir in Junggar Basin, Northwest China

Li¹,

Ma³

et al. 2023

Geofluids

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The sandy conglomerate reservoirs in the Mahu oilfield located in the Junggar Basin of Northwest China are featured by a significant horizontal stress difference between two directions, making formations easy to form double-wing fractures upon hydraulic fracturing instead of creating a complex fracture network. In addition, as the well spacing or interval cluster spacing decreases, the stress interferences between hydraulic fractures strengthen accordingly, leading to more difficulties in the prediction of fracture propagation patterns. Given the geological characteristics in the study area, an extended finite element method (XFEM) based hydraulic fracture model that can handle fracturing fluid flow distribution was proposed to evaluate the seepage, stress, and damage of the formation under hydraulic fracturing. The influences of the initial stress difference, cluster spacing, and fracturing stage sequence on the hydraulic fracture stress interference and the fracture propagation were investigated, producing discoveries that include: (1) as the fractures propagate, the stress difference between two fractures changes as well, and such change is also affected by the initial stress difference and the fracture distance; (2) the postfracturing stress difference first decreases but then increases with the increase in cluster spacing; (3) as the cluster spacing increases, the interfracture stress interference decreases. In addition, the outer fractures suppress the length of the middle fractures, thus limiting the stimulated reservoir area (SRA); (4) for the cases of creating multistage fractures, the later fracturing stage experiences both the interfracture and the interstage stress interferences from the prefracturing stage. As the fracture width changes with time, the nonplanar fracture feature of the later fracturing stage becomes more evident while the corresponding SRA decreases.

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Section: Mathematical Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stress Interferences between Fractures and Fracturing Stages of a Horizontal Well in a Sandy Conglomerate Reservoir in Junggar Basin, Northwest China

Li¹,

Ma³

et al. 2023

Geofluids

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“…The rapid development of numerical methods and computer technology provides an effective way to study hydraulic fracture propagation in large-scale low-permeability reservoirs and compensates for the shortcomings of experimental research. − In recent years, many researchers have employed numerical methods to create large-scale three-dimensional (3D) fracturing models to study the behavior of fracture propagation during multiple horizontal well fracturing. , The effects of well spacing, perforation parameters, fracturing sequences, and horizontal stress differences on fracture propagation have provided a theoretical basis for optimizing horizontal well cluster spacing. − Large-scale fracturing models effectively solve the problem of size bottlenecks in the experimental specimens. Research on the fracture propagation law based on large-scale models can contribute to a better understanding of the mechanism of hydraulic fracture propagation in the field. − …”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Hydraulic Fracture Propagation and Multi-well Effect during Multiple Vertical Well Fracturing in Layered Reservoirs with Low Permeability

Yang,

Li,

et al. 2023

Energy Fuels

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Segmental-layered modeling and fine grid division methods were proposed to construct a three-dimensional largescale layered geologic model and reveal the mechanisms of hydraulic fracture propagation and the well spacing effect in multi-well fracturing in layered reservoirs with low permeability. The hydraulic fracture propagation in layered reservoirs under multi-well fracturing was simulated using a continuum-based discrete element numerical method. The effects of the stratum property difference, in situ horizontal stress difference (HSD), and well spacing on breakdown pressures and fracture propagation were analyzed. The concept of "extension ellipse" was proposed to describe the propagation morphology of fractures, which addresses the difficulty of accurately characterizing the propagation morphology of fractures at the geologic scale. The influence range of the multiwell effect in layered reservoirs was also determined, and the effect mechanisms of stress amplification and attraction and repulsion between fractures on the behavior of hydraulic fracture propagation were revealed. Layered reservoirs and higher in situ HSD restrict the development of hydraulic fractures but greatly reduce the breakdown pressures. The multi-well fracturing mode changes the stress field distribution around the wells and weakens the effects of in situ HSD on fracture propagation. In comparison to homogeneous reservoirs, the range of the multi-well effect in the layered reservoirs is relatively small. At the fracturing site, the well spacing should be appropriately increased in the direction of the maximum horizontal stress and should be reduced in the direction of minimum horizontal stress, helping hydraulic fracture development and improving the fracturing stimulation effect in layered reservoirs. This study addresses the deficiency of considering stratum property differences in the existing large-scale fracturing models, and the results provide a reference for the optimization and design of fracturing simulation in the layered reservoirs with low permeability.

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“…Haghshenas et al (2021) devised a practical analytical tool considering the hydraulic fractures and matrix systems in interference tests with a Laplace transform combined with pseudo-time and pseudo-pressure functions. Seth et al (2021) created a model to study the interference pressure behavior between horizontal wells. Using this model, they could determine fracture geometry and other characteristics.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of pressure interference tests for wells connected by a large hydraulic fracture

Escobar

Prada

Suescún-Díaz

2021

J Petrol Explor Prod Technol

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Shale formations are being exploited in several places around the world. Thus, an adequate characterization of such formations is recommended. In this work, two interpretation methodologies—TDS technique and conventional analysis—are implemented for determining the fracture permeability, from interference tests, between two wells connected by a large hydraulic fracture. Therefore, equations have been developed for both interpretation techniques and tested with synthetic examples. The estimated fracture permeabilities closely match the values initially used for the simulation of the tests.

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Analyzing Pressure Interference Between Horizontal Wells During Fracturing

Cited by 14 publications

References 21 publications

Stress Interferences between Fractures and Fracturing Stages of a Horizontal Well in a Sandy Conglomerate Reservoir in Junggar Basin, Northwest China

Stress Interferences between Fractures and Fracturing Stages of a Horizontal Well in a Sandy Conglomerate Reservoir in Junggar Basin, Northwest China

Mechanisms of Hydraulic Fracture Propagation and Multi-well Effect during Multiple Vertical Well Fracturing in Layered Reservoirs with Low Permeability

Interpretation of pressure interference tests for wells connected by a large hydraulic fracture

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