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机构地区:[1]西北大学地质学系,陕西西安710069 [2]长安大学资源学院,陕西西安710054
出 处:《石油实验地质》2003年第3期305-309,共5页Petroleum Geology & Experiment
基 金:国家重大基础前期研究专项项目(2 0 0 2ccc0 140 0 )
摘 要:该文以辽河油田曙一区杜 84块兴隆台油层超稠油油藏为例 ,进行了 12次热模拟实验。结果分析表明 ,引起地层伤害最本质的因素是沥青质沉积。沥青质在孔隙中的沉积现象非常普遍 ,主要呈星点状、薄膜状、斑块状甚至网状等。沥青质沉积对孔渗的伤害程度随温度的增高呈增大的趋势 ,而随压力增大的变化在小于 11.5MPa时呈增大的趋势 ,在大于 11.5MPa时则呈减小的趋势。其对孔隙度的伤害程度不及对渗透率的那么明显 ,后者的伤害率平均在 80 %以上 ,属强度伤害 ,而前者的伤害率只有 1.3%~6 .5%。影响沥青质沉积的因素主要是稠油的组成、温度。Twelve times of the thermal simulation experiment were done with samples from viscous oil pools in the Xinglongtai oil reservoirs of Du 84 block, Shuguang 1 district, Liaohe oilfield. The results of the experiment indicated that the essential factor resulting in formation damage was asphaltene precipitation. The phenomenon that asphaltene precipitated in pores was very prevalent. The aggregated asphaltene took the shapes of star spots, films, patches or even networks. The damage degree of asphaltene precipitation to porosity and permeability increased with temperature . It increased with pressure when the pressure was less than 11.5MPa, but decreased with pressure when the pressure was more than 11.5MPa. The average damage rate of permeability was above 80%. It belonged to strong damage. The damage rate of porosity was only 1.3%-6.5%. The major affecting factors of asphaltene precipitation were the component of viscous oil, temperature, pressure and solvent.
关 键 词:热模拟实验 影响因素 稠油热采 地层伤害 沥青质沉积
分 类 号:TE122.1[石油与天然气工程—油气勘探]
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