Abstract:

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.

Key words: crude asphaltene, precipitation, formation damage, evaluationmethods