Characteristics and factors of gas-water relative permeability in volcanic gas reservoir

Zhang, Xing; Yang, Shenglai; Zhang, Ling; Chen, Hao; Liang, Qimin; Ma, Quanzheng

doi:10.1080/15567036.2011.654313

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Zhang et al (2016) suggest that as gas saturation decreases, the potential of the gel to limit water relative permeability sharply decreases. 77 Moreover, recent investigations 33,35,36,78,79 state that significant trapping of residual nonwetting saturation due to RPM treatment results in a greater restriction to water (wetting) flow and eventually significantly increases Frr w Considering all above, we conclude that the reduction in Frr w with increasing water flow rates is due to both the deformation of the gel layer and decreasing S gr .…”

Section: Resultsmentioning

confidence: 57%

A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

et al. 2020

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Excessive water production is a significant challenge during hydrocarbon production from oil and gas reservoirs, and it is typically controlled by polymer gel placement. However, the fundamental process in terms of how precisely this gel reduces water production in gas reservoirs is rarely reported. The objective of paper is to investigate the impact of cross-linked polyacrylamide (poly(acrylamide-co-acrylic acid) partial sodium salt) gel as a relative permeability modifier for a sandstone/gas/water system and provides insights into the detailed in situ gel behavior inside the porous medium. Stronger gels increased water retention inside the porous media yet decreased the lubrication effect of the gel. Moreover, as the water flow rate increased (during imbibition), the water relative permeability reduction decreased, which is attributed to (a) gel shear thinning behavior and (b) reduction in the residual gas saturation. However, the gel showed shear thickening behavior during gas flow. At low gas flow rates, gel performance is mainly controlled by the gel lubrication effect, while at higher gas flow rates, the significance of gel rigidity is greatly increased. These effects were associated by gas diffusion and gas dissolution in the gel, which in turn expanded the gel layer and reduced gas permeability. Moreover, we identified two counteracting mechanisms (i.e., water retention and lubrication effects) responsible for the disproportionate permeability reduction. In addition, we identified a critical flow rate above which the gel treatment becomes unsuccessful as both effects (i.e., water retention and lubrication) were significantly reduced. These findings thus provide novel insights into the factors leading to successful gel placement to better control water production.

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Section: Resultsmentioning

confidence: 57%

A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

et al. 2020

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“…Recently, several large-scale volcanic gas reservoirs have been discovered in the Junggar Basin, the Songliao Basin and the Bohai Bay Basin. These reservoirs have reserves of over 3×10 12 m 3 and have become one of controversial issues that have raised concern in the natural gas development of China [1]. The volcanic gas reservoir in the Kalamay gas field of the Junggar Basin is a typical gas reservoir of dual pore medium, whose pore is the main reservoir pore and whose fracture is the primary seepage channel.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Percolation Characteristics of a Single-Phase Gas in a Low-Permeability Volcanic Reservoir Under High Pressure

Tang¹

2015

TOPEJ

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In this paper, we find that with the decrease in the average pore pressure in the process of gas production, both the slippage effect and the stress sensitivity effect will gradually increase; the increase in the slippage effect is significant, while the increase in the stress sensitivity effect is not. In this paper, the Kalamay volcanic gas reservoir of the Junggar Basin in China was selected as the object of our research. The gas reservoir has typical fractured volcanic reservoirs, and the long-term percolation feature remains unclear. To study the percolation characteristics of singlephase gas under high pressure, the experimental method was designed to simulate these characteristics in the process of gas production by measuring the gas flow in the core and the input and the output pressure at both ends. We carried out simulation experiments of single-phase gas flow percolation characteristics under high pressure using 11 pieces of volcanic rock samples in three wells of the study area. The results show that as the core pore pressure increased, the permeability of low-permeability cores of the volcanic rock decreased significantly at room temperature. However, this decrease became more gradual, which means that the higher the core pore pressure is, the smaller the permeability variation caused by gas slippage is; when the pore pressure is above 10 MPa, the permeability is nearly constant, slippage effect significantly reduces in the process of gas percolation, so it can be completely ignored under these formation conditions. As the pore pressure decreases, the slippage effect and stress sensitivity effect will gradually increase; when the pore pressure is less than 10 MPa, the permeability appears to increase significantly, and this is especially true for a pressure of 5 MPa. The main cause of this result is the slippage effect of gas seepage during the depletion of the gas reservoir, when the pore pressure is lower than a certain value. The valid stress changes of the core are not large, and the stress sensitivity is not strong, so the slippage effect plays a major role, which leads to an increase in the gas permeability during the late period of certain flow gas production.

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Pore-scale simulation of gas-water two-phase flow in volcanic gas reservoir based on Volume of Fluid method

Yang

et al. 2022

Journal of Natural Gas Science and Engineering

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Characteristics and factors of gas-water relative permeability in volcanic gas reservoir

Cited by 3 publications

References 10 publications

A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

An Experimental Study on Percolation Characteristics of a Single-Phase Gas in a Low-Permeability Volcanic Reservoir Under High Pressure

Pore-scale simulation of gas-water two-phase flow in volcanic gas reservoir based on Volume of Fluid method

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