Effects of water invasion law on gas wells in high temperature and high pressure gas reservoir with a large accumulation of water-soluble gas

Huang, Xiaoliang; Guo, Xiaolu; Zhou, Xiang; Shen, Chen; Lu, Xinqian; Zhang, Qi; Xiao, Qi; Yan, Wende

doi:10.1016/j.jngse.2018.11.029

Cited by 15 publications

(3 citation statements)

References 37 publications

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“…The goal of water control in the horizontal wellbore of a bottom-water gas reservoir is to make the pressure profile in the wellbore as gentle as possible, so as to make no difference in flow resistance, reduce the flow energy loss in the horizontal section, achieve superconductivity or solve the uneven pressure distribution, set up a new flow channel, add synchronous pressure relief bottom hole, and force the front edge of the bottom-water to advance evenly [28].…”

Section: Water Control Development Strategy For Bottom-water Gas Rese...mentioning

confidence: 99%

Water Invasion Law and Water Invasion Risk Identification Method for Deep Sea Bottom-Water Gas Reservoir

Zhi

et al. 2022

Energies

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This study analyzes the water invasion characteristics and water encroachment of the deep sea bottom-water gas reservoir (LS17 field) in the South China Sea for the purpose of developing horizontal wells. Gas-producing profile tests and a three-dimensional (3D) water invasion simulation are used to produce a quantitative analysis of the bottom-water cresting influence factors. On this basis, we establish a suitable risk identification method for the water influx of a deep bottom-water reservoir. The results show that: (1) During the development of a bottom-water gas reservoir, the water ridging is affected by reservoir heterogeneity, production system and heel–toe effect of a horizontal wellbore, and reservoir heterogeneity is the main influencing factor; (2) the horizontal–vertical ratio of the well area determines whether the gas well productivity will be affected by the risk of water invasion. The stronger the reservoir heterogeneity, the smaller the safety limit value of the horizontal–vertical ratio; (3) when the permeability differential increases gradually, the safety limit value of the transverse longitudinal ratio decreases in turn; (4) based on the relationship curve between permeability level difference and the safety limit value of the horizontal–vertical ratio in the well area, the horizontal–vertical ratio of the N1H well is far greater than the safety limit value. The well is at high risk of water invasion and should be developed by water control. In order to improve deep seabed water and gas reservoirs, water control development should be carried out in well areas with sufficient water energy and high water invasion risk. The water invasion characteristics of bottom-water gas reservoirs under different water control technologies (such as variable density screen technology, filling water blocking, breathable coated gravel technology, etc.) and production systems (periodic gas production technology) should be studied. The research results can not only judge the water invasion risk of deep seabed water and gas reservoirs under different permeability levels and gas production rates but also provide a reference for water control development of offshore and onshore bottom-water and gas reservoirs.

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Section: Water Control Development Strategy For Bottom-water Gas Rese...mentioning

confidence: 99%

Water Invasion Law and Water Invasion Risk Identification Method for Deep Sea Bottom-Water Gas Reservoir

Zhi

et al. 2022

Energies

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“…Sandstone reservoirs with bottom water drive are important parts of unconventional petroleum resources, which are characterized by early water breakthrough, short water-free oil recovery period, rapid water cut increase, and strong heterogeneity. − With large scale and high abundance, bottom water reservoirs are strictly controlled by structure, stratum, and other conventional traps. Since natural interbeds between sandstone reservoirs and the bottom aquifer are usually weak or absent, water can easily intrude the production wells and the oil/water interface moves toward the wellbore. , Once water breakthrough occurs, the water cut increases significantly, which inhibits the flow of oil, and a large amount of residual oil remains in the middle and upper part of the reservoir, reducing production efficiency. − Therefore, the exploitation of sandstone reservoirs with bottom water drive suffers from the bottom water coning and huge production cost issues. − …”

Section: Introductionmentioning

confidence: 99%

Laboratory Evaluation on the Water Flooding Characteristics in Bottom Water Reservoir Containing Interbeds

Lee,

Tang,

Yan

et al. 2023

ACS Omega

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Sandstone reservoirs with bottom water drive are widely distributed all over the world, which are characterized by the complex process of oil and water storage and transmission. At present, the research on the water flooding process and oil–water evolution characteristics in bottom water reservoirs containing interbeds needs to be strengthened. In this study, water flooding experiments with different placements of the interbeds were conducted using a two-dimensional (2D) vertical model. The results demonstrated that the interbeds make the bottom water flow upward more evenly, resulting in decreased incursion speed, increased displacement area, and better displacement effect. Moreover, compared with the tilted interbed model, the horizontal model has a 6% higher oil recovery rate, exhibiting a better oil displacement effect. The results presented herein will provide important guidance on water control in bottom-aquifer oil reservoirs containing interbeds and will promote unconventional petroleum resources recovery.

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“…The significant reduction of gas recovery caused by non-uniform water invasion is a key problem in the development of gas reservoirs with water. The global development of typical gas reservoirs shows that non-uniform water invasion results in productivity reduction as high as 60-80% for gas wells, and the recovery of water invaded gas reservoirs is generally less than 50%, while that of fractured water invaded gas reservoirs is only 20-45% [12][13][14][15][16][17][18][19]. Therefore, the development of water-control to improve recovery of gas reservoirs is an important and difficult global issue.…”

Section: Introductionmentioning

confidence: 99%

Physical Simulation Experimental Technology and Mechanism of Water Invasion in Fractured-Porous Gas Reservoir: A Review

Zhou

et al. 2021

Energies

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In the development process for a fractured-porous gas reservoir with developed fracture and active water, edge water or bottom water easily bursts rapidly along the fracture to the production well, and the reservoir matrix will absorb water, reducing the gas percolation channel and increasing the gas phase percolation resistance of the reservoir matrix, therefor reducing the stable production capacity and recovery efficiency of the gas reservoir. For this reason, this paper investigates physical simulation experimental technology and mechanisms as reported by both domestic and foreign scholars regarding water invasion in fractured-porous gas reservoirs. In this paper, it is considered that the future trend and focus of water invasion experiments will be to establish a more realistic three-dimensional physical model on the basis of fine geological description, combined with gas reservoir well pattern deployment and production characteristics, and to fully consider the difference between horizontal and vertical water invasion along the reservoir side; at the same time, dynamic parameters such as model pressure field and water saturation field can be obtained in real time. Based on this understanding of the water invasion mechanism of fractured-porous gas reservoirs, we propose the next research direction and the development countermeasures such as water controls, drainage, and dissolved water seals and water locks to combat water invasion in reservoirs, along with the injection of gas to replenish formation energy, etc., so as to slow down and control the influence of water invasion.

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Effects of water invasion law on gas wells in high temperature and high pressure gas reservoir with a large accumulation of water-soluble gas

Cited by 15 publications

References 37 publications

Water Invasion Law and Water Invasion Risk Identification Method for Deep Sea Bottom-Water Gas Reservoir

Water Invasion Law and Water Invasion Risk Identification Method for Deep Sea Bottom-Water Gas Reservoir

Laboratory Evaluation on the Water Flooding Characteristics in Bottom Water Reservoir Containing Interbeds

Physical Simulation Experimental Technology and Mechanism of Water Invasion in Fractured-Porous Gas Reservoir: A Review

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