Drilling downhole anomaly monitoring method

The present invention discloses a drilling downhole anomaly monitoring method. The method comprises: a pre-drilling prediction step of analyzing and predicting drilling anomaly by utilization of a preset anomaly prediction module according to drilling design data, field construction data and area drilling information, and obtaining potential anomaly distribution well sections and anomaly symptomatic parameters; and a mid-drilling monitoring step of during the drilling process, determining whether the current drilling well section belongs to the potential anomaly distribution well sections or not according to mid-drilling data of drilling, analyzing and obtaining an actual variation trend of anomaly symptomatic parameters of the potential anomaly distribution well section according to the mid-drilling data if the current drilling well section belongs to the potential anomaly distribution well sections, comparing the actual variation trend with a simulated variation trend of the anomaly symptomatic parameters which is obtained by utilization of a preset data monitoring module, and determining whether the current drilling well section is abnormal according to comparison results. According to the method, drilling downhole anomaly monitoring can be more visual, more pertinent and more efficient, downhole troublesome conditions can be effectively prevented or avoided, and drilling downhole construction safety is ensured.