原油沥青质沉积引起储层损害的评价与控制

防止沥青质沉积造成的储层损害是疏松砂岩稠油油藏开发生产中遇到的技术难题之一。采用岩心流动实验装置,建立了可定量评价原油沥青质沉积所引起储层损害的新方法,并对沉积过程中影响损害程度的几种因素进行了系统的评价。另外,建立了沥青质沉积抑制剂和清除剂作用效果的评价方法,并筛选出适用于疏松砂岩稠油油藏的沥青质沉积抑制剂YZ-06和DA-80以及沥青质沉积清除剂L-01和L-02,从而形成了从室内评价沥青质沉积引起储层损害到化学方法控制该损害的储层保护新技术。

EVALUATION AND CONTROL OF FORMATION DAMAGE INDUCED BY CRUDE ASPHALTENE PRECIPITATION

To prevent formation damage induced by asphaltene precipitation is one of difficult issues encountered during heavy crude reservoir production. In this paper, a new method to evaluate the formation damage induced by precipitation of asphaltene quantitatively was established by adopting the core flooding tests, and the effect of various factors on formation damage was evaluated. The methods to evaluate the effectiveness of the asphaltene inhibitors and solvents were established. According to the experimental results, the asphaltene inhibitors YZ-06 and DA-80, and asphaltene solventL-01 and L-02 are shown to be suitable for the evaluated reservoir. Thus, a new technologywasestablished including evaluating and ntrolling formation damage induced by precipitation of crude asphaltene.