Physical simulation for water invasion and water control optimization in water drive gas reservoirs

Abstract The development of water drive gas reservoirs (WDGRs) with fractures or strong heterogeneity is severely influenced by water invasion. Accurately simulating the rules of water invasion and drainage gas recovery countermeasures in fractured WDGRs, thereby revealing the mechanism of water inv...

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Autores principales:	Xuan Xu, Xizhe Li, Yong Hu, Qingyan Mei, Yu Shi, Chunyan Jiao
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0955a14c9c8d4d99a265ec64e07cd1e3
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spelling	oai:doaj.org-article:0955a14c9c8d4d99a265ec64e07cd1e32021-12-02T11:39:38ZPhysical simulation for water invasion and water control optimization in water drive gas reservoirs10.1038/s41598-021-85548-02045-2322https://doaj.org/article/0955a14c9c8d4d99a265ec64e07cd1e32021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85548-0https://doaj.org/toc/2045-2322Abstract The development of water drive gas reservoirs (WDGRs) with fractures or strong heterogeneity is severely influenced by water invasion. Accurately simulating the rules of water invasion and drainage gas recovery countermeasures in fractured WDGRs, thereby revealing the mechanism of water invasion and an appropriate development strategy, is important for formulating water management measures and enhancing the recovery of gas reservoirs. In this work, physical simulation methods were proposed to gain a better understanding of water invasion and to optimize the water control of fractured WDGRs. Five groups of experiments were designed and conducted to probe the impacts of the distance between the fractures and the gas well, the drainage position, the drainage timing and the aquifer size on the water invasion and production performance of a gas reservoir. The gas and water production and the internal pressure drop were monitored in real time during the experiments. Based on the above experimental works, a theoretical analysis was conducted to quantitatively evaluate the performance of the gas reservoir recovery via the gas well production performance, water invasion, dynamic pressure drop and residual gas and water distribution analysis. The results show that when the fracture scale was appropriate, a gas well drilled close to a fracture (Experiment 1-3) or a high-permeability formation could also produce gas and achieve drainage efficiently. The recovery factor of Experiment 1-3 reached 62.5%, which was 24.6% and 21.1% higher than those of Experiments 1-1 and 1-2, respectively, which had wells drilled in low-permeability areas. Draining water near an aquifer can effectively inhibit water invasion during the early stage of gas recovery. The setup in Experiment 2-1 effectively inhibited water invasion and avoided the formation of water-sealed volumes of gas to recover 30% more gas than recovered with that of Experiment 1-1 without drainage wells. A shorter distance between the drainage well and the aquifer increased the drainage capacity and decreased the gas production capacity, respectively (Well 2 at Point A vs Point B). A larger aquifer had a lower gas recovery, which reduced the economic benefit. For example, due to an infinitely large aquifer, the reserves in Experiment 4-1 were developed by a single well, the gas recovery was only 33.4%. These research results are expected to be beneficial for the preparation of development plans and the optimization of water control measures for WDGRs.Xuan XuXizhe LiYong HuQingyan MeiYu ShiChunyan JiaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-24 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xuan Xu Xizhe Li Yong Hu Qingyan Mei Yu Shi Chunyan Jiao Physical simulation for water invasion and water control optimization in water drive gas reservoirs
description	Abstract The development of water drive gas reservoirs (WDGRs) with fractures or strong heterogeneity is severely influenced by water invasion. Accurately simulating the rules of water invasion and drainage gas recovery countermeasures in fractured WDGRs, thereby revealing the mechanism of water invasion and an appropriate development strategy, is important for formulating water management measures and enhancing the recovery of gas reservoirs. In this work, physical simulation methods were proposed to gain a better understanding of water invasion and to optimize the water control of fractured WDGRs. Five groups of experiments were designed and conducted to probe the impacts of the distance between the fractures and the gas well, the drainage position, the drainage timing and the aquifer size on the water invasion and production performance of a gas reservoir. The gas and water production and the internal pressure drop were monitored in real time during the experiments. Based on the above experimental works, a theoretical analysis was conducted to quantitatively evaluate the performance of the gas reservoir recovery via the gas well production performance, water invasion, dynamic pressure drop and residual gas and water distribution analysis. The results show that when the fracture scale was appropriate, a gas well drilled close to a fracture (Experiment 1-3) or a high-permeability formation could also produce gas and achieve drainage efficiently. The recovery factor of Experiment 1-3 reached 62.5%, which was 24.6% and 21.1% higher than those of Experiments 1-1 and 1-2, respectively, which had wells drilled in low-permeability areas. Draining water near an aquifer can effectively inhibit water invasion during the early stage of gas recovery. The setup in Experiment 2-1 effectively inhibited water invasion and avoided the formation of water-sealed volumes of gas to recover 30% more gas than recovered with that of Experiment 1-1 without drainage wells. A shorter distance between the drainage well and the aquifer increased the drainage capacity and decreased the gas production capacity, respectively (Well 2 at Point A vs Point B). A larger aquifer had a lower gas recovery, which reduced the economic benefit. For example, due to an infinitely large aquifer, the reserves in Experiment 4-1 were developed by a single well, the gas recovery was only 33.4%. These research results are expected to be beneficial for the preparation of development plans and the optimization of water control measures for WDGRs.
format	article
author	Xuan Xu Xizhe Li Yong Hu Qingyan Mei Yu Shi Chunyan Jiao
author_facet	Xuan Xu Xizhe Li Yong Hu Qingyan Mei Yu Shi Chunyan Jiao
author_sort	Xuan Xu
title	Physical simulation for water invasion and water control optimization in water drive gas reservoirs
title_short	Physical simulation for water invasion and water control optimization in water drive gas reservoirs
title_full	Physical simulation for water invasion and water control optimization in water drive gas reservoirs
title_fullStr	Physical simulation for water invasion and water control optimization in water drive gas reservoirs
title_full_unstemmed	Physical simulation for water invasion and water control optimization in water drive gas reservoirs
title_sort	physical simulation for water invasion and water control optimization in water drive gas reservoirs
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0955a14c9c8d4d99a265ec64e07cd1e3
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_version_	1718395683574120448

Physical simulation for water invasion and water control optimization in water drive gas reservoirs

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