EXPERIMENTAL RESEARCH ON LOST CIRCULATION AND OVERFLOW MONITORING SYSTEM FOR DRILLING ENGINEERING BASED ON THE REQUIREMENTS OF SAFE AND EFFICIENT OIL AND GAS DRILLING

摘要

With the development of oil and gas exploration,the drilling proportion of deep and ultra-deep wells is increasing,which leads to the risk of blowout accidents in drilling engineering.The establishment of lost circulation and overflow monitoring methods is of great significance for controlling the blowout accidents and achieving the objectives of safe and high-quality drilling.The main factors that cause the occurrence of lost circulation and overflow were analyzed.Combined with the actual working conditions of oil and gas drilling,taking the total amount of drilling fluid,density and inlet and outlet flow as the monitoring objects,the judgment model of lost circulation and overflow was established.Based on the new model,the overall scheme,software and hardware design of the lost circulation and overflow monitoring system were developed,which could meet the needs of safe and efficient drilling of oil and gas.The field test of the monitoring system has achieved good monitoring and early warning effect in Daqing Oilfield,which proved the working stability and reliability of the monitoring system.