Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability
The injection from a well to other wells can be difficult in extralow-permeability oil reservoirs. In order to address this issue, a method of cyclic huff-n-puff with surfactants based on complex fracture networks for a single horizontal well was proposed and then investigated in terms of the effect...
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doaj-98a570d53856401b8dc723eb2f990d1c2021-07-12T02:13:21ZengHindawi-WileyGeofluids1468-81232021-01-01202110.1155/2021/6898581Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow PermeabilityBao Cao0Pu Wei1Fuchun Tian2Yang Yan3Kun Xie4Weijia Cao5Xuewei Liu6Xiangguo Lu7Yu Li8Hongru Li9Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of EducationPetroChina Xinjiang Oilfield CompanyPetroChina Dagang Oilfield CompanyPetroChina Dagang Oilfield CompanyKey Laboratory of Enhanced Oil and Gas Recovery of Ministry of EducationKey Laboratory of Enhanced Oil and Gas Recovery of Ministry of EducationPetroChina Dagang Oilfield CompanyKey Laboratory of Enhanced Oil and Gas Recovery of Ministry of EducationKey Laboratory of Enhanced Oil and Gas Recovery of Ministry of EducationKey Laboratory of Enhanced Oil and Gas Recovery of Ministry of EducationThe injection from a well to other wells can be difficult in extralow-permeability oil reservoirs. In order to address this issue, a method of cyclic huff-n-puff with surfactants based on complex fracture networks for a single horizontal well was proposed and then investigated in terms of the effects of injection and fracture parameters on the oil recovery in water-wet extralow-permeability models. Firstly, the interfacial tension (IFT) and contact angle with different surfactant concentrations were measured to determine the basic properties of the surfactants. Then, the experiments of huff-n-puff with surfactants at different threshold injection pressures and soaking time were carried out to determine the oil increasing effects and analyze the pore-scale (micropores, mesopores, and macropores) mechanisms by combining the technology of nuclear magnetic resonance (NMR), which showed that the recovery increased with threshold injection pressure mostly in mesopores and macropores, while that increased with soaking time mostly in micropores. Eventually, the experiments of cyclic huff-n-puff based on different fracture distributions were conducted in six plate-fractured models to investigate the effects of surfactants, primary fracture, and secondary fracture on each cycle of huff-n-puff. Cyclic huff-n-puff with surfactants assisted by complex fracture networks including both primary and secondary fractures would bring to a higher oil recovery. However, other methods should be taken after several cycles of huff-n-puff due to the rapid reduction of oil recovery of each cycle. The findings for the proposed method should provide a meaningful guide to the development of extralow-permeability oil reservoirs.http://dx.doi.org/10.1155/2021/6898581 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bao Cao Pu Wei Fuchun Tian Yang Yan Kun Xie Weijia Cao Xuewei Liu Xiangguo Lu Yu Li Hongru Li |
spellingShingle |
Bao Cao Pu Wei Fuchun Tian Yang Yan Kun Xie Weijia Cao Xuewei Liu Xiangguo Lu Yu Li Hongru Li Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability Geofluids |
author_facet |
Bao Cao Pu Wei Fuchun Tian Yang Yan Kun Xie Weijia Cao Xuewei Liu Xiangguo Lu Yu Li Hongru Li |
author_sort |
Bao Cao |
title |
Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability |
title_short |
Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability |
title_full |
Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability |
title_fullStr |
Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability |
title_full_unstemmed |
Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability |
title_sort |
experimental investigation on cyclic huff-n-puff with surfactants based on complex fracture networks in water-wet oil reservoirs with extralow permeability |
publisher |
Hindawi-Wiley |
series |
Geofluids |
issn |
1468-8123 |
publishDate |
2021-01-01 |
description |
The injection from a well to other wells can be difficult in extralow-permeability oil reservoirs. In order to address this issue, a method of cyclic huff-n-puff with surfactants based on complex fracture networks for a single horizontal well was proposed and then investigated in terms of the effects of injection and fracture parameters on the oil recovery in water-wet extralow-permeability models. Firstly, the interfacial tension (IFT) and contact angle with different surfactant concentrations were measured to determine the basic properties of the surfactants. Then, the experiments of huff-n-puff with surfactants at different threshold injection pressures and soaking time were carried out to determine the oil increasing effects and analyze the pore-scale (micropores, mesopores, and macropores) mechanisms by combining the technology of nuclear magnetic resonance (NMR), which showed that the recovery increased with threshold injection pressure mostly in mesopores and macropores, while that increased with soaking time mostly in micropores. Eventually, the experiments of cyclic huff-n-puff based on different fracture distributions were conducted in six plate-fractured models to investigate the effects of surfactants, primary fracture, and secondary fracture on each cycle of huff-n-puff. Cyclic huff-n-puff with surfactants assisted by complex fracture networks including both primary and secondary fractures would bring to a higher oil recovery. However, other methods should be taken after several cycles of huff-n-puff due to the rapid reduction of oil recovery of each cycle. The findings for the proposed method should provide a meaningful guide to the development of extralow-permeability oil reservoirs. |
url |
http://dx.doi.org/10.1155/2021/6898581 |
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