Application Of Pressure Control Drilling Technology

With the more frequent the deeper and more complex formations exploration and development activities, there are many kick, lost circulation, the harmful gas leaks, sticking, time long tripping, etc. drilling complex issues.Narrow density window safe drilling well is the main reason for long drilling cycle,frequent accidents and the underground complex of high temperature and high pressure wells. Managed pressure drilling technology is main way to solve these problems at home and abroad. With the domestic MPD technology to flourish, applied research of managed pressure drilling technology has important significance.The article established MPD wellbore pressure control model, the model contained normal drilling and picking a single, tripping and drill three conditions and studied MPD wellbore pressure calculation method, including drilling fluid rheological model for optimization, wellbore circulating pressure loss calculation method, downhole pressure fluctuations calculation methods and wellbore ECD calculation method, verified wellbore pressure calculation through simulation. In addition, the article studied MPD technology and equipment supporting, similarly in three conditions of technology research, while applying the theoretical model described earlier and algorithms for a variety of operating conditions simulation and analysis, according to technology research carried out equipment ancillary. What’s more, the article completed the MPD theory, wellbore pressure calculation method and equipment supporting the overall study.Finally, though the the MPD program design and the application example analysis, domestic MPD technology and equipment in downhole pressure control has reached a very high accuracy (±0.35MPa), can meet the operational requirements of the narrow density window and can be application.