Estimation of fracture height growth in layered tight/shale gas reservoirs using flowback gas rates and compositions–Part II: Field application in a liquid-rich tight reservoir

Clarkson, Christopher R.; Ghaderi, Seyyed M.; Kanfar, Mohammed; Iwuoha, Sochi; Pedersen, Per Kent; Nightingale, Michael; Shevalier, Maurice; Mayer, Bernhard

doi:10.1016/j.jngse.2016.11.014

Cited by 27 publications

(8 citation statements)

References 13 publications

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“…In the remaining two scenarios, we performed the Vs estimation on the basis that the Montney interval is comprised of mixed lithologies of either sandstone and shale, or dolomite and shale. For the two mixed lithology scenarios tested, a shale lithology cut-off of 115° GR API [6] was defined from the GR log using shale limits measured from marine shale intervals (Fernie and Kaskapau Formations) overlying the Montney Formation in our study area. The six estimated Vs logs were compared with the measured Vs from dipole sonic logs (Fig.…”

Section: Methods Detailsmentioning

confidence: 99%

“…Each data point represents individual log values. The Montney facies shown are based on Montney GR-based lithofacies [6], where Sand: GR < 60 API, Silt: 60 ≤ GR ≤ 115 API, and Shale: GR > 115 API. The sands predominantly occur in the upper section of the Montney interval in the study area.…”

Section: Methods Detailsmentioning

confidence: 99%

“…The GR sand and GR shale cut-offs were defined at 60 o GR API and 115 o GR API respectively, according to [6]. The input Ø was determined from the bulk density (RHOB) by taking into account the matrix and fluid densities as described in [6].…”

Section: Methods Detailsmentioning

confidence: 99%

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A working method for estimating dynamic shear velocity in the montney formation

et al. 2019

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Section: Methods Detailsmentioning

confidence: 99%

Section: Methods Detailsmentioning

confidence: 99%

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A working method for estimating dynamic shear velocity in the montney formation

et al. 2019

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“…(1) Damage variable and permeability coefficient following Mohr-Coulomb criterion When the element shear stress reaches the Mohr-Coulomb damage threshold, the damage variable can be expressed as below. 4 Geofluids where ε c0 is the critical damage strain and f cr is the critical damage stress. The permeability coefficient of elements is listed below.…”

Section: Coupled Equation Of Seepage-damagementioning

confidence: 99%

“…To improve the gas-extraction efficiency and control gas-outburst, the permeability of composite thin coal seam needs to be enhanced. To date, hydraulic fracturing, fracturing the rock with high-pressure water, is widely used to improve the poor permeability of composite thin coal seam [1][2][3][4]. Therefore, understanding of hydraulic fracture (HF) propagation and permeability evolution in the composite thin coal seam is fundamental to stimulate the composite thin coal seam.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Fracture Propagation and Permeability Evolution in the Composite Thin Coal Seam

Liu

Huang

et al. 2021

Geofluids

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Hydraulic fracturing can improve the permeability of composite thin coal seam. Recently, characterizing hydraulic fracture (HF) propagation inside the coal seam and evaluating the permeability enhancement with HF extension remain challenging and crucial. In this work, based on the geological characteristics of the coal seam in a coal mine of the southwest China, the RFPA2D-Flow software is employed to simulate the HF propagation and its permeability-increasing effect in the composite thin coal seam, and a couple of outcomes were obtained. (1) Continuous propagation of the hydraulic microcrack-band is the prominent characteristic of HF propagation. With the increment of the injection-water pressure, HF generation in the composite thin coal seam can be divided into three stages: stress accumulation, stable fracture propagation, and unstable fracture propagation. (2) The hydraulic microcrack-band propagates continuously driven by the fluid-injection pressure. The microcrack-band not only cracks the coal seam but also fractures the gangue sandwiched between the coal seams. (3) The permeability in the composite thin coal seam increases significantly with the propagation of hydraulic microcrack-band. The permeability increases by 1~2 magnitudes after hydraulic fracturing. This study provides references to the field applications of hydraulic fracturing in the composite thin coal seam, such as optimizing hydraulic fracturing parameters, improving gas drainage, and safe-efficient mining.

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Fracture closure modes during flowback from hydraulic fractures

Taleghani

Cai

Pouya

2020

Num Anal Meth Geomechanics

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SummaryFlowback analysis recently has been considered as a potential tool for assessing induced fractures through corresponding pressure analyses and rate transient analysis. In this paper, we study fracture closure mechanisms during the flowback of fracturing fluid after hydraulic fracturing treatments. Although it is known that flowback can be significantly affected by the geometry of the fractures and closure stress, there has not been any effort to understand the problem from the geomechanical point of view; rather, available studies assume that a fracture closes uniformly with constant fracture compressibility. The coupled geomechanics and fluid flow model presented in this paper help to elucidate how geostresses may affect fracturing fluid recovery under different conditions. We perform a scaling analysis to formulate the occurrence of different fracture closure modes and then use numerical analyses to verify our scaling parameters. The factors governing the flowback process include the mechanical and petrophysical properties of the rock as well as preexisting discontinuities such as natural fractures. Three different closure modes for fracture networks are described and numerically verified. The occurrence of each mode can dramatically affect fracturing fluid recovery. The role of fluid leakoff into the formation, fractures conductivity, and drawdown strategy are examined for each fracture closure scenario.

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Estimation of fracture height growth in layered tight/shale gas reservoirs using flowback gas rates and compositions–Part II: Field application in a liquid-rich tight reservoir

Cited by 27 publications

References 13 publications

A working method for estimating dynamic shear velocity in the montney formation

A working method for estimating dynamic shear velocity in the montney formation

Hydraulic Fracture Propagation and Permeability Evolution in the Composite Thin Coal Seam

Fracture closure modes during flowback from hydraulic fractures

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