天然气工业2024，Vol.44Issue(3)：164-171,8.DOI:10.3787/j.issn.1000-0976.2024.03.014
基于压力衰减法的低渗透储层高温敏感性评价实验
High-temperature sensitivity evaluation experiment of low-permeability reservoirs based on the pressure pulse decay method
摘要
Abstract
Low-permeability oil and gas reservoirs are vulnerable to damage that is difficult to remove in the process of well drilling and completion.Traditional steady-state displacement method for evaluating such damage has technical limitations such as poor applicability and low experimental efficiency.Based on the basic principle of the pressure pulse decay method,the law of upstream pressure pulse decay and its relationship with the permeability of cores are analyzed,and the damage evaluation experimental setup and method suitable for low-permeability reservoirs are established by taking the pressure pulse decay time before and after core damage as the evaluation index.Then,sensitivity evaluation experiments are performed on cores of deep low-permeability sandstone in the Bozhong sag of the Bohai Bay Basin at normal temperature and 150 ℃.The results show that the pressure pulse decay time is only related to the permeability of the core when the experimental conditions are constant.The pressure pulse decay method can be used to evaluate the damage degree of the low-permeability core without permeability calculation.The experimental setup is simple and operable,avoiding the complex permeability calculation and the error caused thereby.The experimental time is far less than that of the traditional steady-state displacement method.With good repeatability,the pressure pulse decay method is well applicable to low-permeability gas reservoirs,and ultra-low to super-low permeability oil reservoirs.The high-temperature environment obviously aggravates the sensitivity damage of the reservoir.Therefore,the research on damage of deep high-temperature reservoirs and corresponding solution need to fully consider the influence of high temperature.The proposed experiment based on the pressure pulse decay method is more applicable to sensitivity evaluation of low-permeability reservoirs than the traditional method,and provides a methodological and theoretical support for finding solutions to protection of high-temperature,low-permeability reservoirs.关键词
低渗透储层/压力衰减/稳态驱替/渗透率/储层损害评价/高温敏感性/储层保护Key words
Low-permeability reservoir/Pressure pulse decay/Steady-state displacement/Permeability/Reservoir damage evaluation/High-temperature sensitivity/Reservoir protection分类
能源科技引用本文复制引用
赵欣,苏文治,单锴,孙昊,王超群,邱正松,张宇飞..基于压力衰减法的低渗透储层高温敏感性评价实验[J].天然气工业,2024,44(3):164-171,8.基金项目
国家自然科学基金项目"裂缝性地层致密承压封堵机理与温敏智能堵漏新方法研究"(编号:51974354)、山东省高等学校青创科技支持计划"海洋深水井筒工作液创新团队"(编号:2022KJ069). （编号:51974354）
