The effect of hydraulic fracture characteristics on production rate in thermal EOR methods

Shakib, Jaber Taheri; Akhgarian, Ebrahim; Ghaderi, Abdolvahed

doi:10.1016/j.fuel.2014.10.063

Cited by 33 publications

(3 citation statements)

References 17 publications

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“…And it can also increase the permeability of the coal seam, homogenize the ground stress field, inhibit the gas outflow and balance the gas pressure field. [12,14,[16][17][18][19] Coal seam ground stress is one of the important factors affecting the permeability of coal seams. [20] Chen and Men et al [21,22] studied the coal seams in Southwest China and concluded that the horizontal stress anisotropy is low which leads to the complex hydraulic fracture network.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Causes of Altered Coal Seam Permeability Based on On‐Site Directional Long‐Drill Hydraulic Fracturing Tests

Zhao,

Wei,

Luo

et al. 2024

Energy Tech

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This study aims to explore the problem of gas extraction from coal seams. Based on the engineering background of Longfeng coal mine in Guizhou Province, hydraulic fracturing test and DC method test are carried out in 5922 wind tunnel of Longfeng coal mine's second mining area, according to which a drainage model is established to simulate the process of gas drainage from a single hole, in order to evaluate the effect of gas drainage after the completion of the hydraulic fracturing tests. According to the test results, it can be seen that the fracturing is mainly concentrated on both sides of borehole No. 9‐4, with an impact area of up to 30 m and a resistance increase in the range of 100–400 Ωm. After calculation, the theoretical value of effective gas extraction radius after fracturing is 4.83 m, which is increased by 49%; the permeability coefficient after fracturing is increased to 2.64 times of that of the original coal seam. In addition, the average concentration of extracted gas is 68%, which is 7.5 times higher than that without fracturing. Therefore, this research result can provide technical reference for the management of low permeability coal seams under similar geological conditions.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Causes of Altered Coal Seam Permeability Based on On‐Site Directional Long‐Drill Hydraulic Fracturing Tests

Zhao,

Wei,

Luo

et al. 2024

Energy Tech

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“…The process of injecting a large volume of water into geothermal reservoirs increases the pore pressure and the potential of fault failure (Hubert and Rubey 1959;Cappa and Rutqvist 2011;Ellsworth 2013;Levandowski et al 2018;Scholz 2019). From previous studies (e.g., Altmann et al 2010;Cho et al 2013;Taheri-Shakib et al 2015;Cao et al 2019), numerical simulation has become a standard method to study the behaviour of fault during injection, thus, stress and pressure build-up can be related to the fluid flow response, which could afford a better correlation with the production rate. Additionally, reports of Cho et al 2013 described the pressure-sensitivity nature of fractured media, and how stress change influences fault permeability enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, understanding the evolution of stress-dependent permeability in geothermal reservoir is of great interest because of the nature of the tight matrix and the fractures, which are more susceptible to stress changes (Zhang et al 2018). Thus, the study of the variation in local stress adjacent to the wellbore and the effective stress acting normal to fracture in order to identify the initiation and propagation direction of the induced fracture would give insight into the permeability evolution, which influences production forecasting (Taheri-Shakib et al 2015). When assessing the impact of fracture-controlled permeability reduction during production, the pressure-dependent permeability of natural fracture is often correlated with the production performance of the reservoir (Cho et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the influence of joint direction on production optimization in enhanced geothermal systems

Eyinla

2021

J Petrol Explor Prod Technol

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Heat extraction from geothermal reservoir by circulating cold water into a hot rock requires an amount of fluid pressure, which is capable of inducing fault opening. Although stress change promotes the potential of fault failure and reactivation, the rate at which fluid pressurization within the fault zone generates variations in pore pressure as fault geometry changes during geothermal energy production have not been thoroughly addressed to include the effects of joint orientation. This study examines how different fault/joint models result in different tendency of injection-induced shear failure, and how this could influence the production rate. Here, a numerical simulation method is adopted to investigate the thermo-hydro-mechanical (THM) response of the various fault/joint models during production in a geothermal reservoir. The results indicate that pore pressure evolution has a direct relationship with the evolution of production rate for the three joint models examined, and the stress sensitivity of the individual fault/joint model also produced an effect on the production rate. Changing the position of the injection well revealed that the magnitude of shear failure on the fault plane could be controlled by the hydraulic diffusivity of fluid pressure, and the production rate is also influenced by the magnitude of stress change at the injection and production wells. Overall, the location of the injection well along with the fault damage zone significantly influenced the resulting production rate, but a more dominating factor is the joint orientation with respect to the maximum principal stress direction. Thus, the rate of thermal drawdown is affected by pore pressure elevation and stress change while the fault permeability and the production rate are enhanced when the joint’s frictional resistance is low.

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Preparation and evaluation of acryloyl morpholine modified emulsion fracturing fluid thickener with high temperature resistance and salt resistance

Shi

Sun

et al. 2022

J of Applied Polymer Sci

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To prepare the thickener of fracturing fluid with temperature resistance, salt resistance and quick dissolution, an emulsion thickener (ASC) was synthesized by acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and acryloyl morpholine. The dissolution, salt resistance and drag reduction of ASC, and the viscoelasticity, temperature resistance and shear resistance and gel breaking properties of fracturing fluid formed by ASC and zirconium crosslinker were investigated. The results showed that the sticky time of ASC was less than 60 s and the drag reduction rate was 72.5% in 100,000 mg/L brine, showing that ASC had thickening ability in high salinity brine and satisfied the requirements of continuous fluid preparation on the fracturing process.The viscosity of ASC fracturing fluid was 98 mPa s after shearing at 200 C and 170 s À1 for 150 min when the salinity was 100,000 mg/L. When the ammonium persulfate concentration was 400 mg/L, the viscosity of the broken fluid was 4.0 mPa s. The temperature resistance, salt resistance and shear resistance of ASC emulsion fracturing fluid could be significantly improved by the introduction of acryloyl morpholine, ASC fracturing fluid had the characteristics of high elasticity and low viscosity, which could meet the application requirements under ultra-high temperature reservoirs.

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The effect of hydraulic fracture characteristics on production rate in thermal EOR methods

Cited by 33 publications

References 17 publications

Analysis of the Causes of Altered Coal Seam Permeability Based on On‐Site Directional Long‐Drill Hydraulic Fracturing Tests

Analysis of the Causes of Altered Coal Seam Permeability Based on On‐Site Directional Long‐Drill Hydraulic Fracturing Tests

Analysis of the influence of joint direction on production optimization in enhanced geothermal systems

Preparation and evaluation of acryloyl morpholine modified emulsion fracturing fluid thickener with high temperature resistance and salt resistance

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