Abstract:Managed pressure drilling is an important technology to realize bottom hole pressure in a safe drilling fluid density window,and automatic choke manifold is the key to implement this technology.Comprehensive consideration of the technology requirements of managed pressure drilling and the limited area of offshore drilling platform,a skid mounted automatic choke manifold with three layer space structure was designed in this paper,meanwhile,the auxiliary hydraulic control system was also designed.The automatic choke manifold is a integrated set of automatic system,which includes some parameters monitors for pressure,flow rate,temperature,and could apply a certain pressure at the wellhead.The automatic choke manifold has the function of choke effect,pressure compensation,discharge,flow and pressure monitoring,etc,meanwhile,the space structure has been greatly optimized,which greatly reduces the equipment’s floor area,and improves its versatility.This provides some references for the application of offshore managed pressure drilling technology and the development of automatic choke system.