Impact of well shut-in after hydraulic-fracture treatments on productivity and recovery of tight oil reservoirs

Eltahan, Esmail; Rego, Fabio Bordeaux; Yu, Wei; Sepehrnoori, Kamy

doi:10.1016/j.petrol.2021.108592

Cited by 21 publications

(9 citation statements)

References 18 publications

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“…Finally, in Figure 25f, the effect of shut-in is reflected, where the reduction in pressure as a result of production reduces with the increase in soaking time, which indicates that there is an increase in the relative permeability. 179,184…”

Section: Flow Of Gas From the Naturalmentioning

confidence: 99%

Hydraulic Fracturing and Enhanced Recovery in Shale Reservoirs: Theoretical Analysis to Engineering Applications

et al. 2023

Energy Fuels

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Shale reservoirs are extensively exploited using hydraulic fracturing, which forms multiple cracks that connect with the existing natural fractures to create a continuous path for the gas stored in the kerogen to flow to the production well. Apart from the tedious nature of hydraulic fracturing, the mechanism of the storage and flow of gas is equally complex since multiple phases and scales are involved. An accurate understanding of hydraulic fracturing coupled with a strategy of analyzing the flow and overall recovery of gas is paramount to ensure efficient exploitation. In this work, a comprehensive review of the recent strategies used in analyzing the hydraulic fracturing, storage, flow, and recovery of gas is presented. To begin with, the experimental, analytical, and numerical approaches pertinent to hydraulic fracturing are deeply explored. Additionally, the flow of gas through the newly opened channels is accounted for by using a quadruple-domain approach where the mechanisms of flow in shale reservoirs at the nanoscale, microscale, mesoscale, and macroscale are considered. Furthermore, a strategy to capture the multiple phases, including gas, oil, and water, and recover both carbon dioxide and methane is explored through thermal and enhanced gas recovery approaches. This review provides a baseline for understanding how the hydraulic fracture evolves and propagates to create new channels that contribute to the flow of gas, how the gas flows through the created channels across the many scales of the shale reservoir, and how to improve recovery from shale reservoirs.

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Section: Flow Of Gas From the Naturalmentioning

confidence: 99%

Hydraulic Fracturing and Enhanced Recovery in Shale Reservoirs: Theoretical Analysis to Engineering Applications

et al. 2023

Energy Fuels

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“…There are obvious differences in the oil breakthrough time, flowback rate, water cut, and daily oil production of different shale oil wells. Proper well shut-in or the addition of a chemical agent to promote imbibition is conducive to improving the initial productivity. , Wijaya et al , used imbibition data for the Middle Bakken shale oil reservoir to perform reservoir numerical simulations with accounting for the compaction-dominant and imbibition-dominant mechanisms. They showed that only when shale reservoirs have a strong imbibition capacity is the situation favorable to oil recovery.…”

Section: Imbibition At the Reservoir Scalementioning

confidence: 99%

Imbibition Mechanisms of Fracturing Fluid in Shale Oil Formation: A Review from the Multiscale Perspective

et al. 2023

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The breakthrough of shale oil in North America led to a worldwide energy revolution. Shale reservoirs show multiscale properties and a large proportion of nanopores compared to conventional reservoirs, which makes the imbibition mechanisms of fracturing fluids within shale reservoirs exceptionally complicated. For instance, the fracturing fluid shows a distinct imbibition behavior at different scales. Traditional models face significant challenges in imbibition characterization. Understanding the imbibition mechanisms in shale oil formations from a multiscale perspective can help to make full use of the positive effect and enhance oil recovery. We review imbibition mechanisms in shale reservoirs from the nanoscale to the reservoir scale. The imbibition principles in a single nanopore and the improvement of the traditional characterization models are clarified. Then, at the pore scale, we elaborate on the imbibition laws obtained from the microfluidic chip, pore network model, and direct simulations. We also outline the imbibition dynamics at the core scale, the influences of capillary forces and osmotic pressure, and the variations of the pore structure. Finally, the imbibition behavior at the reservoir scale and field examples considering the imbibition effect are introduced. We analyze the existing problems on each scale and discuss the future trends in this area. This work is expected to help readers systematically understand the mechanisms and behavior of fracturing fluid imbibition in shale oil reservoirs at different scales and accelerate the exploitation of shale resources.

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“…With the increasing demand for energy and the deepening of oilfield development, the available reserves of conventional reservoirs are decreasing. − The effective development of unconventional oil resources, such as low-permeability and tight reservoirs, is playing an increasingly important role in energy supply. − To realize industrial production, low-permeability and tight reservoirs are usually fractured at first to improve permeability, followed by water flooding or gas flooding. − Low-permeability and tight reservoirs are characterized by low permeability, poor reservoir flow capacity, a large difference in plane physical properties, and a rapid decline in formation energy. − Therefore, it is difficult to maintain the water injection pressure, and the oil recovery of water flooding is low . For these two types of reservoirs, gas flooding offers unique advantages over other production practices .…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Stability of Oil-Based Nitrogen Foam under Ultrahigh Pressure and Elevated Temperature

Wang

et al. 2022

Energy Fuels

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Nitrogen flooding can effectively develop lowpermeability and tight reservoirs. However, because of the low viscosity and density of nitrogen, gas channeling easily occurs, resulting in low oil recovery. Oil-based nitrogen foam can be used to control gas channeling during nitrogen flooding, but the foam stability directly affects the application effect. In this paper, the performance of the foaming agent was optimized by compounding, and a stable oil-based nitrogen foam was successfully built, with a foam volume exceeding 400 mL and a half-life of liquid drainage exceeding 40 min. The foam stability under an ultrahigh pressure of 60 MPa and an elevated temperature of 80 °C were investigated by an ultrahigh pressure and ultrahigh temperature PVT system for the first time. The influence of base oil viscosity and interfacial tension on foam stability was examined. The experimental results showed that the foam stability improved when the pressure increased and worsened when the temperature rose. The foam stability was the best at 20 °C and 60 MPa, and the half-life of liquid drainage was nearly 4 h. The foam stability was the worst at 80 °C and 0.1 MPa, and the half-life was <1 min. The higher was the base oil viscosity, the better was the foam stability. Although the rise of pressure and temperature reduces the nitrogen−diesel interfacial tension, the interfacial tension is not the dominant factor affecting foam stability at elevated temperatures. This paper has a certain guiding significance for perfecting the stability mechanism of oil-based nitrogen foam under ultrahigh pressure and elevated temperature and better controlling gas channeling during nitrogen flooding in low-permeability and tight reservoirs.

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Impact of well shut-in after hydraulic-fracture treatments on productivity and recovery of tight oil reservoirs

Cited by 21 publications

References 18 publications

Hydraulic Fracturing and Enhanced Recovery in Shale Reservoirs: Theoretical Analysis to Engineering Applications

Hydraulic Fracturing and Enhanced Recovery in Shale Reservoirs: Theoretical Analysis to Engineering Applications

Imbibition Mechanisms of Fracturing Fluid in Shale Oil Formation: A Review from the Multiscale Perspective

Experimental Investigation on the Stability of Oil-Based Nitrogen Foam under Ultrahigh Pressure and Elevated Temperature

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