Sealing properties and structure optimization of packer rubber under high pressure and high temperature
投稿时间:2018-04-27  
英文关键词:Packer rubber, Sealing property, Structure optimization, Hydrogenated nitrile–butadiene rubber (HNBR), AFLAS rubber
基金项目:We would like to thank the financial support from the Fundamental Research Funds for the Central Universities under Grant nos. 17CX05020 and 17CX06002, the Research Funds for Introducing Talent (PhD) of China University of Petroleum under Grant no. YJ20170026, the National Science and Technology Major Project under Grant no. 2016ZX05042004 and the Joint Funds of the National Natural Science Foundation of China under Grant no. U1762104.
作者单位
Wen-Jian Lan College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China 
Han-Xiang Wang College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China 
Xin Zhang College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China 
Sheng-Shan Chen College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China 
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英文摘要:
      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 Lan,Han-Xiang Wang,Xin Zhang,Sheng-Shan Chen,2019.Sealing properties and structure optimization of packer rubber under high pressure and high temperature.Petroleum Science,(3):632~644.
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