Water producing mechanisms of carbonate reservoirs gas wells: A case study of the Right Bank Field of Amu Darya, Turkmenistan

Cheng, Youyou; Mu, Lan; Zhu, Enyong; Zhang, Peijun; Guo, Chuangxin; Leng, Yuxin; Wei, Zhanjun; Chen, Pengyu; Xing, Yuzhong; Cheng, M.; Shi, Huaizhong; Zhang, Liang-Jie

doi:10.1016/s1876-3804(17)30011-3

Cited by 18 publications

(11 citation statements)

References 5 publications

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“…The edge and bottom water invades the well bottom with the increasing of water invasion, whereas with a steep increase in the wellbore liquid level and increase of abandonment pressure, a large amount of gas in the reservoirs will be trapped, which results in the lower recovery factor of gas reservoirs. According to previous studies, the recovery factor of water-driven gas reservoirs (20-60%) is significantly lower than that of dry gas reservoirs (80-95%) (Li et al 2010(Li et al , 2017bCheng et al 2017). Moreover, the operations such as draining are required when the gas-phase superficial velocity in the wellbore is too low to provide sufficient energy to remove accumulated liquid from the well bottom, which increases the production costs.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

Fang

Shen

et al. 2019

Environ Earth Sci

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Fractured carbonate gas reservoirs feature high heterogeneity and difficulty in development, and the invasion of edge and bottom water intensifies the complexity of exploitation of such gas reservoirs. In this study, reservoir cores with a permeability of 0.001 mD, 0.1 mD, and 10 mD were selected by analyzing the fracture characteristics of the Longwangmiao gas reservoir, and water invasion in fractured carbonate gas reservoirs with edge and bottom water was simulated using an experimental system to investigate the effects of different parameters on gas reservoir exploitation. The results show that the larger the water volume ratio, the more serious the water invasion and the lower the recovery factor. But water aquifer did not strongly affect the recovery factor once the water aquifer exceeded a critical value. The higher the gas production rate, the faster the water invasion and the smaller the recovery factor. The recovery factor peaked when the gas production rate was equivalent to the gas supply capacity of the matrix to the fractures. For gas reservoirs with the overall permeability, the higher the matrix permeability, the higher the recovery factor. Although an appropriate fracturing scale was able to enhance the recovery factor when its matrix permeability was low, an excessive fracturing scale would cause water to flow along the fractures at a rapid rate, which further caused a sharp decline in the recovery factor. With the increase of matrix permeability, fractures exerted a decreasing effect on gas reservoirs. These results can provide insights into a better understanding of water invasion and the effects of reservoir properties so as to optimize gas production in fractured carbonate gas reservoirs.

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Section: Introductionmentioning

confidence: 99%

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

Fang

Shen

et al. 2019

Environ Earth Sci

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“…A study has been done by Cheng et al [42] on the right region of the Amu Darya gas field, which is located at the Turkmenistan border, and they tried to identify the source of water production in a gas field. e gas field has an active bottom aquifer.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…Physical properties and WGR are vital factors in the identification of water sources, and they are used for singlesource water problems. Condensate water has low density, low salinity, and a value of pH considerably less than seven due to acidic dissolution component of natural gas [42]. Operating fluids (drilling and acidizing fluids) contain a large number of additives with high density and high salinity.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…e drilling fluid pH is as high as strong alkaline solutions and for acidizing fluids is very low [4,[43][44][45]. e formation water samples of the aquifer indicate that its salinity and density is between the value for condensed water and operating fluids [42].…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…For WGR, due to high temperature and pressure in the right region of Amu Darya, the modified Mcketta-Wehe chart was used to evaluate the content of condensate water [46]. For the operating fluid, WGR is high at the initial flowback stage and decreases rapidly in the later stages [42]. Afterward, the formation water WGR is more than that of condensate water and constantly increases throughout the reservoir life [42].…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

See 2 more Smart Citations

Water Production Problem in Gas Reservoirs: Concepts, Challenges, and Practical Solutions

Roozshenas

Hematpur²,

Abdollahi³

et al. 2021

Mathematical Problems in Engineering

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Gas resources play a key role in nowadays energy supply and provide 24% of the diverse energy portfolio. Water encroachment is one of the main trapping mechanisms in gas reservoirs. It decreases recovery by reduction of reservoir life, limits productivity and efficiency of wells, and elevates safety risks in gas production. The lack of a comprehensive study about water production problems is the primary motivation for this study. Contrary to the serious concern over the standalone investigation of an actual water production case study, less concern is put to deal with the problem comprehensively through an investigation of all potential sources and mechanisms, required methods, and available techniques. This study presents the potential sources of the problem, methods to identify it, and approaches to address it. Firstly, possible sources are described. Secondly, the diagnostic techniques are expressed. Then, practical solutions used in actual cases to overcome problems are elaborated. The solutions include both well- and reservoir-oriented approaches. Finally, all proper strategies are summarized to tackle the water problems in gas fields. The current study comprehensively presents the available methods for water control problems in parallel with conceptual and qualitative comparison. The finding of this study can be very constructive for better understanding of water sources, available diagnostic tools, and solutions for controlling water production in gas reservoirs and, consequently, taking the best decision in real case studies before attempting many water shut-off approaches.

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Microscopic characteristics of water invasion and residual gas distribution in carbonate gas reservoirs

Chen

Liu

Zhao

et al. 2021

Energy Science & Engineering

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We used the nuclear magnetic resonance online detection method to analyze the water invasion mechanism and residual gas distribution of a carbonate rock gas reservoir. The T2 spectra obtained by using the Carr‐Purcell‐Meiboom‐Gill (CPMG) pulse sequence were applied to characterize the invasion water and residual gas distribution. The results showed that (a) in the pore‐type gas reservoir, the water first invades the meso–macropores and then the small pores as the pressure decreases further. The fracture distribution in a fracture‐pore‐type gas reservoir has an effect on the water invasion mode. The water can enter the pores through the fracture wall after the water invades the fracture. (b) In the pore‐type gas reservoir, 37.7% of the residual gas resides in the small pores, while the rest resides in the macropores. While in the fracture‐pore‐type gas reservoir, 4.8% ~ 26.8% of the residual gas is in the smaller pores and 69.2% ~ 95.7% in the macropores. Barely, any residual gas resides in the fractures. The residual gas in the small pores is difficult to produce. (c) The residual gas is controlled by the fracture penetration, amount of bottom water, fracture width, and production rate. It is suggested the production rate decreased to induce the water to invade the meso–macropores after the gas well begins to produce water to reduce the amount of residual gas in the meso–macropores.

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Water producing mechanisms of carbonate reservoirs gas wells: A case study of the Right Bank Field of Amu Darya, Turkmenistan

Cited by 18 publications

References 5 publications

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

Water Production Problem in Gas Reservoirs: Concepts, Challenges, and Practical Solutions

Microscopic characteristics of water invasion and residual gas distribution in carbonate gas reservoirs

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