Horizontal Well Completion with Multiple Artificial Bottom Holes Improves Production Performance in Bottom Water Reservoir

Wang, Haidong; Liu, Yikun

doi:10.1155/2020/7247480

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…Aiming at the water control development of a deep seabed water gas reservoir, the following strategies are put forward [29][30][31][32][33]: (1) To suppress the uneven inflow of bottomwater by improving the heel-toe effect of a horizontal wellbore and weakening the influence of reservoir heterogeneity. The corresponding water control measures are the annular multi-stage artificial bottom hole technology [34] and variable density screen technology suitable for horizontal wells; (2) the exploitation system should be regulated to prevent the formation of uneven water invasion, and the corresponding water control measures should be periodic gas recovery technologies; (3) a water-blocking barrier was established near the bottom of the well to suppress the ridge of the front water head, and the corresponding measures were filling the horizontal well with permeability and water-blocking gravel technology; (4) the comprehensive technology of water control and development for deep seabed water gas reservoirs is formed, in which all stages complement and accommodate each other.…”

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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“…Horizontal well is an effective method to exploit the residual oil in bottom water reservoirs, but it also only delays the water breakthrough time, and more oil can be produced before the water breakthrough of oil wells. 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 the production efficiency (Liu et al, 2016;Wang and Liu, 2020;Zoeir et al, 2020). To address this problem, nitrogen foam flooding is an effective method for improving oil recovery in the middle and late stages of bottom water reservoir development.…”

Section: Introductionmentioning

confidence: 99%

Study on the mechanism of improved oil recovery by nitrogen foam flooding in bottom water reservoirs

Wang²,

Ma³

et al. 2023

Front. Energy Res.

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There are abundant bottom water reservoirs in China. Unlike conventional oil reservoirs, bottom water reservoirs have various problems, such as early water breakthrough, short water-free oil recovery period, and rapid water cut increase. For example, during water flooding, the injected water easily breaks into the bottom water and does not effectively displace the upper crude oil. The recovery rate is generally low. Based on this phenomenon, an experimental study of nitrogen foam flooding in bottom water reservoirs is conducted in this paper. The seepage characteristics of nitrogen foam in oil and water layers are studied through one-dimensional core tube experiments. Through two-dimensional plate oil displacement experiments, we have revealed the fluid migration and distribution characteristics in the plane and vertical directions during nitrogen foam flooding in bottom water reservoirs; additionally, we have summarized the mechanisms of nitrogen foam in bottom water reservoirs involved in improving oil recovery characteristics. The research results show that the seepage resistance of foam in the water layer is much greater than that in the oil layer, effectively increasing the displacement strength of the oil layer. During the development stage of bottom water flooding in bottom water reservoirs, the water cut increases rapidly, the bottom water coning is obvious, and the residual oil is mainly distributed between the oil wells and the upper part of the oil layer near the wellbore. During nitrogen foam flooding, the foam enters the water layer to form an effective plug so that the subsequent foam is diverted into the oil layer; additionally, the oil is displaced laterally to the production well for production. When the foam enters the oil layer, it defoams and floats to form a secondary gas cap; this effect causes displacement of the residual oil at the top and effectively improves the displacement efficiency by weeping volume of the injected fluid”

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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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Horizontal Well Completion with Multiple Artificial Bottom Holes Improves Production Performance in Bottom Water Reservoir

Cited by 3 publications

References 18 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

Study on the mechanism of improved oil recovery by nitrogen foam flooding in bottom water reservoirs

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

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