摘要
油砂储层天然沥青含量及黏度极高,热力开采过程中的高温环境对油藏应力场和变形量的影响非常大,目前多采用高温高压条件下的三轴试验模拟真实热力开采条件下的储层岩石变形特征。为了掌握储层岩石在与热力开采过程相一致的应力/温度路径下的应力–应变关系及力学性能参数,统计分析加拿大Athabasca和Cold Lake、委内瑞拉Faja、我国克拉玛依油砂的力学性质随温度的演化规律,并从微观角度解释温度对不同地区油砂宏观力学参数影响规律的异同。研究发现,不同地区油砂的力学性质受温度的影响程度存在明显差异,其中ColdLake和克拉玛依油砂的力学性质受温度影响较大。根据温度对标准化力学参数的统计规律分析,发现高温下油砂力学性质的演化存在3种模式,其主要取决于泥质/沥青的含量、矿物颗粒的压碎/重排列程度、天然沥青的黏度、胶结物及胶结类型等因素。研究可以为油砂热力开采过程中的储层地质力学理论分析和数值模拟提供参考。
Oil sand reservoir is filled with the rich viscous bitumen,so the high temperature can make a significant influence on the reservoir stress/deformation in thermal recovery. High-temperature and high-pressure triaxial compression test is usually used for the modeling of reservoir deformation. To acquire the stress-strain response as well as the mechanical properties under the stress/temperature conditions corresponding to thermal operations,the effects of temperature on mechanical properties of oil sands in Athabasca,Cold Lake,Faja（Venezuela）,and Karamay were studied. The microstructure of different oil sands was investigated to interpret the temperatureinduced mechanical properties. It was concluded that the thermal effects on different oil sands differ greatly and that oil sands in Cold Lake and Karamay are more thermosensitive. According to the statistical analysis for normalized parameters under varying temperatures,it was found that the thermomechanical response for different oil sands can be divided into three patterns,determined by factors like the content of fine or bitumen,the degree of mineral grain crushing/rearrangement,the viscosity of bitumen and the cements and cementation types.
作者
高彦芳
陈勉
林伯韬
金衍
陈森
于会永
GAO Yanfang;CHEN Mian;LIN Botao;jiNYan;CHEN Sen;YU Huiyong(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;College of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;Oil Production Technology Research Institute,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第11期2520-2535,共16页
Chinese Journal of Rock Mechanics and Engineering
基金
国家青年科学基金资助项目(51404281)~~
关键词
岩石力学
油砂
温度
压力
力学性质
微观结构
rock mechanics
oil sand
temperature
pressure
mechanical properties
microstructure
