基于压力衰减法的低渗透储层高温敏感性评价实验

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中文摘要：低渗透油气藏在钻完井过程中易受到损害且难以解除,而利用传统的稳态驱替法评价低渗透储层损害存在适用性差及实验效率低等技术局限.为此,基于压力脉冲衰减法基本原理,分析了上游压力衰减规律及其与岩心渗透率的关系,以岩心损害前后压力脉冲衰减时间为评价指标,建立了适用于低渗透储层损害评价的实验设备与方法,并利用渤海湾盆地渤中凹陷深部低渗透砂岩岩心,开展了室温和150 ℃高温条件下的敏感性实验.研究结果表明:①当实验条件一定时,压力衰减时间仅与岩心的渗透率有关,压力脉冲衰减法可在无需计算渗透率的情况下对低渗透岩心的损害程度进行评价;②实验设备组成简单且操作便捷,避免了复杂的渗透率计算及其带来的误差,实验所需时间远低于常规的稳态法且可重复性良好,在低渗透气藏、特低渗透及超低渗透油藏具有很好的适用性;③高温环境明显加剧了储层的敏感性损害,深部高温储层损害特征及技术对策研究需要充分考虑高温的影响.结论认为,该认识解决了传统低渗透储层敏感性评价方法适用性差的难题,为高温低渗透储层保护技术对策研究提供了实验方法支撑和理论依据.

外文标题：High-temperature sensitivity evaluation experiment of low-permeability reservoirs based on the pressure pulse decay method

外文摘要：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.

外文关键词：

Low-permeability reservoirPressure pulse decaySteady-state displacementPermeabilityReservoir damage evaluationHigh-temperature sensitivityReservoir protection

作者：

赵欣、苏文治、单锴、孙昊、王超群、邱正松、张宇飞

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作者单位：

中国石油大学(华东)石油工程学院

深层油气全国重点实验室·中国石油大学(华东)

中海油田服务股份有限公司油田化学研究院

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

基金：

国家自然科学基金山东省高等学校青创科技支持计划

项目编号：

519743542022KJ069

出版年：

2024

DOI：

10.3787/j.issn.1000-0976.2024.03.014

天然气工业

四川石油管理局中国石油西南油气田公司中国石油川庆钻探工程公司

天然气工业

CSTPCD北大核心EI

影响因子：2.298

ISSN：1000-0976

年,卷(期)：2024.44(3)

参考文献量26