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

论文摘要

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 ℃）.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.

论文目录

文章来源

类型: 期刊论文

作者: Wen-Jian Lan,Han-Xiang Wang,Xin Zhang,Sheng-Shan Chen

来源: Petroleum Science 2019年03期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 石油天然气工业

单位: College of Mechanical and Electronic Engineering, China University of Petroleum

基金: 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,the Joint Funds of the National Natural Science Foundation of China under Grant no. U1762104

分类号: TE934.2

页码: 632-644

总页数: 13

文件大小: 3311K

下载量: 19

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