Deepwater Choke and Well Killing Manifold Automatic Control Pressure System and Simulation Experiments

Offshore oil and gas resources are hot spots for development in various countries, but developing deepwater formations will inevitably encounter problems such as ultra-HTHP (high temperature and pressure), narrow safety density window, and complex formation structures. Improper handling can cause kick, blowout and other drilling complications, which will not only cause environmental pollution, but also threaten engineers’ lives. At present, the basic means to deal with kick is still through the engineer to control the opening of choke valve, but the manual control has long adjustment time, large pressure fluctuations, and extremely dependent on the engineer's work experience. With the development and advancement of artificial intelligence and automation technology, oil and gas well pressure control also needs to integrate artificial intelligence and automation technology to carry out research on automatic control system for choke and well killing manifold in deep water for accurate and fast control of wellbore pressure. In this paper, we designed a deepwater choke and well killing manifold automatic control pressure system based on the optimized PID control method and built equipment to conduct simulation experiments to test the ability of the system to track the target pressure stably and quickly as well as the ability to track the continuous pressure curve. The results show that the system can adjust choke valve in place within 35 s during the experimental process of simulating kick and automatic pressure control, at which time the system pressure is stable and the pressure fluctuation is less than 0.02 MPa. This indicates that the deepwater choke and well killing manifold automatic control pressure system established in this paper has the advantages of fast pressure adjustment and high adjustment accuracy, which can replace engineers in automatic control to a certain extent and provide a guarantee for the safe development of offshore It provides a guarantee for the safe development of oil and gas.