Sealing properties and structure optimization of packer rubber under high pressure and high temperature

Abstract During hydraulic fracturing operations of low-permeability reservoirs, packers are the key component to ensure the success of multistage fracturing. Packers enable sections of the wellbore to be sealed off and separately fractured by hydraulic pressure, one at a time, while the remainder of...

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Autores principales:	Wen-Jian Lan, Han-Xiang Wang, Xin Zhang, Sheng-Shan Chen
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Packer rubber Sealing property Structure optimization Hydrogenated nitrile–butadiene rubber (HNBR) AFLAS rubber Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/a0bad167ccba425f97dbc3676552cac3
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spelling	oai:doaj.org-article:a0bad167ccba425f97dbc3676552cac32021-12-02T04:42:08ZSealing properties and structure optimization of packer rubber under high pressure and high temperature10.1007/s12182-018-0296-01672-51071995-8226https://doaj.org/article/a0bad167ccba425f97dbc3676552cac32019-01-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0296-0https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract During hydraulic fracturing operations of low-permeability reservoirs, packers are the key component to ensure the success of multistage fracturing. Packers enable sections of the wellbore to be sealed off and separately fractured by hydraulic pressure, one at a time, while the remainder of the wellbore is not affected. However, reliable sealing properties of the packer rubber are required to meet the high-pressure and high-temperature (HPHT) conditions of reservoirs (such as 70 MPa and 170 °C). In this study, the structures of the packer rubber with two different materials are optimized numerically by ABAQUS and validated by experiments. The optimization process starts from the packer rubber with a conventional structure, and then, the weakest spots are identified by ABAQUS and improved by slightly varying its structure. This process is iterative, and the final optimized structure of a single rubber barrel with expanding back-up rings is achieved. For the structure of three rubber barrels with metallic protective covers, both HNBR and AFLAS fail under HPHT conditions. For the final optimized structure, the packer rubber made of AFLAS can work better under HPHT than that made of HNBR which ruptures after setting. The results show that the optimized structure of a single rubber barrel with expanding back-up rings and the material AFLAS are a good combination for the packer rubber playing an excellent sealing performance in multistage fracturing in horizontal wells.Wen-Jian LanHan-Xiang WangXin ZhangSheng-Shan ChenKeAi Communications Co., Ltd.articlePacker rubberSealing propertyStructure optimizationHydrogenated nitrile–butadiene rubber (HNBR)AFLAS rubberScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 3, Pp 632-644 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Packer rubber Sealing property Structure optimization Hydrogenated nitrile–butadiene rubber (HNBR) AFLAS rubber Science Q Petrology QE420-499
spellingShingle	Packer rubber Sealing property Structure optimization Hydrogenated nitrile–butadiene rubber (HNBR) AFLAS rubber Science Q Petrology QE420-499 Wen-Jian Lan Han-Xiang Wang Xin Zhang Sheng-Shan Chen Sealing properties and structure optimization of packer rubber under high pressure and high temperature
description	Abstract During hydraulic fracturing operations of low-permeability reservoirs, packers are the key component to ensure the success of multistage fracturing. Packers enable sections of the wellbore to be sealed off and separately fractured by hydraulic pressure, one at a time, while the remainder of the wellbore is not affected. However, reliable sealing properties of the packer rubber are required to meet the high-pressure and high-temperature (HPHT) conditions of reservoirs (such as 70 MPa and 170 °C). In this study, the structures of the packer rubber with two different materials are optimized numerically by ABAQUS and validated by experiments. The optimization process starts from the packer rubber with a conventional structure, and then, the weakest spots are identified by ABAQUS and improved by slightly varying its structure. This process is iterative, and the final optimized structure of a single rubber barrel with expanding back-up rings is achieved. For the structure of three rubber barrels with metallic protective covers, both HNBR and AFLAS fail under HPHT conditions. For the final optimized structure, the packer rubber made of AFLAS can work better under HPHT than that made of HNBR which ruptures after setting. The results show that the optimized structure of a single rubber barrel with expanding back-up rings and the material AFLAS are a good combination for the packer rubber playing an excellent sealing performance in multistage fracturing in horizontal wells.
format	article
author	Wen-Jian Lan Han-Xiang Wang Xin Zhang Sheng-Shan Chen
author_facet	Wen-Jian Lan Han-Xiang Wang Xin Zhang Sheng-Shan Chen
author_sort	Wen-Jian Lan
title	Sealing properties and structure optimization of packer rubber under high pressure and high temperature
title_short	Sealing properties and structure optimization of packer rubber under high pressure and high temperature
title_full	Sealing properties and structure optimization of packer rubber under high pressure and high temperature
title_fullStr	Sealing properties and structure optimization of packer rubber under high pressure and high temperature
title_full_unstemmed	Sealing properties and structure optimization of packer rubber under high pressure and high temperature
title_sort	sealing properties and structure optimization of packer rubber under high pressure and high temperature
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/a0bad167ccba425f97dbc3676552cac3
work_keys_str_mv	AT wenjianlan sealingpropertiesandstructureoptimizationofpackerrubberunderhighpressureandhightemperature AT hanxiangwang sealingpropertiesandstructureoptimizationofpackerrubberunderhighpressureandhightemperature AT xinzhang sealingpropertiesandstructureoptimizationofpackerrubberunderhighpressureandhightemperature AT shengshanchen sealingpropertiesandstructureoptimizationofpackerrubberunderhighpressureandhightemperature
_version_	1718401140969701376

Sealing properties and structure optimization of packer rubber under high pressure and high temperature

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