Effect of dynamic threshold pressure gradient on production performance in water-bearing tight gas reservoir

Zhu, Weiyao; Liu, Yuwei; Shi, Yunqing; Zou, Guodong; Zhang, Qitao; Kong, Debin

doi:10.46690/ager.2022.04.03

Cited by 18 publications

(8 citation statements)

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“…Moreover, based on our derived TPG model, a novel multistage fractured horizontal well productivity model is proposed. Compared with other well-scale model, ,,,− our new derived productivity model can reveal the influence of microscopic parameters on oil production. Based on the simulation and analysis of our proposed model, the key information (e.g., the evolution of TPG and permeability) on potential oil phase flow paths and pressure distributions can be determined to identify the optimal fracture location, quantity, and spacing, which are crucial for enhancing fracture performance and oil production.…”

Section: Resultsmentioning

confidence: 99%

A Novel Threshold Pressure Gradient Model and Its Influence on Production Simulation for Shale Oil Reservoirs

Qu,

Tang,

Lei

et al. 2024

Energy Fuels

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Accurate characterization of the threshold pressure gradient (TPG) in shale oil reservoirs is essential for oil production. However, oil−water two-phase flow through shale oil reservoirs with narrow pores involves thermal−hydrological−mechanical coupling, and the relationship between TPG and pore structures under multiple mechanisms has not been adequately modeled mathematically. In this paper, an analytical TPG model of shale oil reservoirs is derived first by considering the combined effects of effective stress, temperature, capillary pressure, pore structures, and boundary layer. After the established model is adequately verified by the obtainable experimental data, it is embedded into a multistage fractured horizontal well productivity model to investigate the influence of relevant parameters on shale oil production. The simulation results suggest that the TPG for the oil phase increases with the increase in effective stress, leading to the decrease in shale oil production. The cumulative oil production with dynamic TPG is much greater than that considering fixed TPG. Moreover, the wettability of the oil−water two phase (e.g., oil−water interfacial tension and equilibrium contact angle) has crucial influences on well performance; thus, changing the wettability of the oil−water two phase by chemical injection is an effective method to enhance oil recovery. The research results can provide technical support for the efficient development of shale oil reservoirs from the perspective of pore-scale two-phase nonlinear flow characteristics and macroscopic productivity evaluation.

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Section: Resultsmentioning

confidence: 99%

A Novel Threshold Pressure Gradient Model and Its Influence on Production Simulation for Shale Oil Reservoirs

Qu,

Tang,

Lei

et al. 2024

Energy Fuels

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“…A fluid can only flow when the driving pressure gradient exceeds a certain value, known as the threshold pressure gradient (TPG). 36 The motion equation that describes the influence of oil, water, and physical and chemical properties on the seepage law in porous media of low-permeability reservoirs is as follows: 37…”

Section: Similarity Criteriamentioning

confidence: 99%

“…The presence of solid walls exerts a significant influence on the behavior of fluid flow, leading to deviation from conventional Darcy’s law for flow. A fluid can only flow when the driving pressure gradient exceeds a certain value, known as the threshold pressure gradient (TPG) . The motion equation that describes the influence of oil, water, and physical and chemical properties on the seepage law in porous media of low-permeability reservoirs is as follows: { true v o = − K K ro μ o true( normal∇ p normalo − ρ normalo g normal∇ z − G normalo true) , oil v w = − K K rw μ w true( normal∇ p normalw − ρ normalw g normal∇ z − G normalw true) , water where K is the permeability, K ro and K rw are relative permeabilities of oil and water, p o is oil-phase pressure, p w is the water-phase pressure, g is the gravity acceleration, G o is the oil-phase TPG, G w is the water-phase TPG, and μ o and μ w are the viscosities of oil and water, respectively.…”

Section: Similarity Criteriamentioning

confidence: 99%

Experimental Study on Waterflooding Characteristics of a Large-Scale Physical Low-Permeability Model Based on a Similarity Criterion

Jiao,

Zhang,

Hou

et al. 2023

Energy Fuels

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“…As for the influence of the TPG on the productivity of tight gas reservoirs, these studies mainly utilize vertical well models to calculate gas productivity, − and the productivity model of fractured horizontal wells with the TPG, including gas–water two-phase flow effects, is rarely reported. For instance, Tian et al obtained the TPG correlation by considering the influences of permeability, connate water, movable water, and vertical well models that accounted for the TPG, slip, and diffusion effects.…”

Section: Introductionmentioning

confidence: 99%

Productivity Analysis of Fractured Horizontal Wells in Tight Gas Reservoirs Using a Gas–Water Two-Phase Flow Model with Consideration of a Threshold Pressure Gradient

Ding

Fan

et al. 2023

Energy Fuels

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Tight gas reservoirs are valuable yet challenging unconventional resources as a result of their complex flow mechanisms. Typical challenges are characterized by gas−water two-phase flows with a threshold pressure gradient (TPG). In this work, experimental studies are initially conducted to investigate and quantify the influence of water saturation on the TPG. A gas− water two-phase flow model is then established for a fractured horizontal well considering the influence of water saturation on gas− water permeability and TPG, along with the dynamic changes in the water−gas ratio. Sensitive studies are performed to investigate the impact of various parameters on the productivity of a horizontal well. The results demonstrate that, as water saturation increases, the TPG increases and the relative permeability of the gas phase decreases, resulting in the gas well productivity decrease. As the permeability decreases, the changes in the TPG become more prominent, leading to a greater impact on productivity. In comparison to a constant TPG, the changes with water saturation in the TPG have a more significant effect on productivity. Hence, it is beneficial to regulate the rate of the water cut increase to enhance production in tight gas reservoirs.

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Effect of dynamic threshold pressure gradient on production performance in water-bearing tight gas reservoir

Cited by 18 publications

References 0 publications

A Novel Threshold Pressure Gradient Model and Its Influence on Production Simulation for Shale Oil Reservoirs

A Novel Threshold Pressure Gradient Model and Its Influence on Production Simulation for Shale Oil Reservoirs

Experimental Study on Waterflooding Characteristics of a Large-Scale Physical Low-Permeability Model Based on a Similarity Criterion

Productivity Analysis of Fractured Horizontal Wells in Tight Gas Reservoirs Using a Gas–Water Two-Phase Flow Model with Consideration of a Threshold Pressure Gradient

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