Intelligent Judgment of Risks While Gas Drilling

At present, the basic monitoring method has been established on the site for the risk monitoring in the gas drilling process, but it is still not perfect. It is necessary for the monitors to analyze and judge the risk quickly and accurately when the monitoring data such as injection gas pressure, drilling time and sand discharge line pressure is abnormal, and the professional knowledge and field experience are extremely required for monitors. Therefore, it is urgent to establish intelligent judgment method for gas drilling risk, so as to ensure the safe and efficient operation of gas drilling. This paper establishes the response relationship between the gas drilling monitoring parameters and the risk category. Based on the judgment theory of fuzzy hierarchy analysis, the monitoring parameters are classified and stratified. The global weight of nine risk monitoring parameters of the formation gas, wellbore instability, formation water production, downhole bums, drill stem fracture, H2S production, stuck freeing, bit balling and drill piercement are analyzed, and the comprehensive judgment weight matrix is constructed. By analyzing the monitoring data and combining with expert experience, the reasonable fluctuation range of monitoring parameters is put forward, and the change vector of monitoring parameters is constructed, and the intelligent judgment method of gas drilling with drilling risk is formed. This method can realize intelligent judgment, alarm, and other functions quickly and accurately, which monitor and judge in real time whether there is a downhole risk in the gas drilling operation, so as to ensure the safety of construction.