Transient model analysis of gas flow behavior for a multi-fractured horizontal well incorporating stress-sensitive permeability

Cao, Lina; Lu, Lize; Li, Xiaoping; Wang, He-Hua; He, Wei; Xu, Bing; Deng, Yong; Jiang, Liping

doi:10.1007/s13202-018-0555-z

Cited by 4 publications

(3 citation statements)

References 28 publications

(21 reference statements)

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“…It is shown that HF length only affects the early flow regimes, including the skin effect transition flow regime, the linear flow regime within HFs, and the early radial flow regime. As the HF length is decreased, pressure drop and pressure derivative curves are shifted upwards (Chen et al, 2016;2Chen et al, 2017a;Cao et al, 2018). With the decrease of HF length, the duration of linear flow regime within HFs becomes short.…”

Section: Effect Of Hydraulic Fractures Permeability Modulusmentioning

confidence: 99%

“…In addition, skin effect and wellbore storage can be introduced into transient-solution directly in the Laplace domain (Cao et al, 2018),…”

Section: Coupling Matrix/natural Fractures and Hydraulic Fracturesmentioning

confidence: 99%

“…(2) The skin effect transition flow regime: The most obvious feature of this stage is a "hump" in the pressure derivative curve. This period is mainly dominated by fluid properties (Cao et al, 2018). (3) The linear flow regime within HFs: Usually, this period is characterized by a slope of 1/2 on the pressure derivative curve; however, the new model is affected by dynamic conductivity, and the slope of the pressure derivative curve is larger than 1/2.…”

Section: Identification Of Flow Regimementioning

confidence: 99%

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Effect of Stress-Sensitive Fracture Conductivity on Transient Pressure Behavior for a Multi-Well Pad With Multistage Fractures in a Naturally Fractured Tight Reservoir

Meng

Tan

et al. 2020

Front. Energy Res.

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This paper presents a semianalytical solution for evaluating transient pressure behavior of a multi-well pad with multistage fractures in a naturally fractured tight reservoir by considering the stress-sensitive effect imposed by both natural and hydraulic fractures. More specifically, the model pertaining to matrix/natural fractures is considered as a dual-porosity continuum, while its analytical flow model can be obtained by use of a slab-source function in the Laplace domain. The hydraulic fracture model is solved by discretizing each fracture into small segments to describe the flow behavior, while stress sensitivity in both the natural fracture (NF) subsystem and hydraulic fracture (HF) subsystem has been taken into account. To validate the newly developed semianalytical model, its solution has been obtained and compared with those of a commercial numerical simulator. By generating the type curves, there may exhibit eight flow regimes: pure wellbore storage, skin effect transition flow, linear flow regime within HFs, early radial flow, biradial flow, transition flow, pseudo-steady diffusion, and the late-time pseudo-radial flow. Furthermore, late-time flow regimes are found to be significantly distorted by the multi-well pressure interference. The smaller the well-rate ratio is, the more distorted the pressure and pressure derivative curves will be. In addition, well spacing and fracture length are found to dominate the flow behavior when multi-well pressure interference occurs. As the well spacing is decreased, the fracture length is increased, and thus occurrence of multi-well pressure interference is initiated earlier. Permeability moduli of NFs and HFs impose no impact on the multi-well pressure interference; however, it can distort flow regimes, leading to a severe distortion of pressure and pressure derivative curves. Similarly, the effect of HF permeability modulus on the flow in a hydraulic fracture, the minimum fracture conductivity is another key factor affecting the “hump” on the pressure curve. As the crossflow coefficient is increased, flow exchange between matrix and NFs is increased. With an increase in the storage ratio, flow exchange lasts longer and the second “dip” on the pressure curve becomes deeper.

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Section: Effect Of Hydraulic Fractures Permeability Modulusmentioning

confidence: 99%

“…In addition, skin effect and wellbore storage can be introduced into transient-solution directly in the Laplace domain (Cao et al, 2018),…”

Section: Coupling Matrix/natural Fractures and Hydraulic Fracturesmentioning

confidence: 99%

Section: Identification Of Flow Regimementioning

confidence: 99%

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Effect of Stress-Sensitive Fracture Conductivity on Transient Pressure Behavior for a Multi-Well Pad With Multistage Fractures in a Naturally Fractured Tight Reservoir

Meng

Tan

et al. 2020

Front. Energy Res.

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Numerical simulation study on the mechanical behavior of shale core and reservoir rock mass

Xiong

et al. 2020

Energy Science & Engineering

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After the hydraulic fracturing of the shale reservoir, the stress field changes during the mining process. The stress sensitivity of the reservoir affects its development capabilities. Moreover, the stress sensitivity of shale reservoirs obtained by various researchers using different experimental methods is not uniform. This study analyzes the physical background differences between reservoir rock mass and experimental core. In this study, we establish the “support structure model” of the reservoir and show that the reservoir rock body has a structural overall effect, such that the supporting effect of the surrounding rock on the overlying strata is very strong. At the same time, we also establish the transverse isotropic numerical model of the shale reservoir on the basis of the real physical background of the reservoir and the experimental physical core model on the basis of the real physical background of the core test. This study shows that the equivalent mechanical behavior of the core test in the holder is pure core compression without the support and pull of the whole rock mass structure. In the real reservoir, the reservoir rock mass has significant structural effect. The actual compression change of real reservoir mining is less than the pure compression displacement of the experimental test core. The core stress sensitivity of the conventional experimental test does not directly describe the true stress‐strain effect of the macroscopic reservoir rock mass as a structural whole. A laboratory stress‐sensitive test apparatus and method that is equivalent to the physical background of a real reservoir needs to be improved or designed.

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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

Zhang

Yang

2021

Journal of Hydrology

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Transient model analysis of gas flow behavior for a multi-fractured horizontal well incorporating stress-sensitive permeability

Cited by 4 publications

References 28 publications

Effect of Stress-Sensitive Fracture Conductivity on Transient Pressure Behavior for a Multi-Well Pad With Multistage Fractures in a Naturally Fractured Tight Reservoir

Effect of Stress-Sensitive Fracture Conductivity on Transient Pressure Behavior for a Multi-Well Pad With Multistage Fractures in a Naturally Fractured Tight Reservoir

Numerical simulation study on the mechanical behavior of shale core and reservoir rock mass

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

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