油田注水开发过程中油层结垢机理的研究

OIL LAYER'S SCALE DEPOSITION MECHANISM IN THE COURSE OF WATERFLOOD

结合大庆外围油田的实际，从水质基础着手，运用Ｏｄｄｏ、Ｓｍｉｔｈ和Ｔｏｍｓｏｎ的物理化学预测公式对榆树林油田和头台油田的地面系统和地下系统条件进行了结垢趋势预测，通过大量的静态实验以及动态模拟结垢实验，说明了油田的结垢类型为碳酸钙，并论述了结垢的影响因素，阐述了油层结碳酸钙垢的原因以及结垢在地层中的分布。最后运用压汞资料和核磁共振资料，指出油层结垢对地层渗透率和孔隙度的影响。

Combining with the actural production of Daqing peripheral oilfields and starting with the water quality, the paper predicts the scale deposition trends both in the surface system and underground one in Yushulin Oilfield and Toutai Oilfield by Oddo., Smith and Tomson's physicochemical predicting formulae. By means of a great deal of static experiment and dynamic scale simulating one, the scale deposition type is proven to be calcium carbonate. In addition, the paper elaborates the affecting factors and reasons of the scale deposition and the its distribution in the formations. In the end, making use of mercury injection data and nuclear magnetic resonance (NMR) ones, the paper presents the influences of oil layer scale deposition on reservoir permeability and porosity.