Hydraulic Modeling And Managed Technology Of MPD Annular Pressure

With the advancing of China petrloum industrial,the exploitation of petroleum continuously into deep complicate layer,the problem of low range density safe window is emerge more and more,has been a main reason of long time drilling deep well,frequently accident,well hole complication,and managed pressure drilling(MPD)is a key for these problem.MPD is a important technology to solve complicate drilling problem,the key of this technology is accurately controlling annular pressure profile.Therefore,the paper will talk about annular hydraulic modeling and control technology of pressure,according to diffrent types of MPD,build MPD hydraulic parameter model and talk about the problem of control pressure.First of all,this paper analysed three main MPD technology,illuminating the foundation principal of Constant bottom hole pressure,Mud cap control pressure,Micro flux control;besides for the rheological model optimization which is a key part of MPD use golden optimization to choose proper rheological model,and then,supply a calculation model for well hydrostatic column pressure,annular pressure lose surge pressure,then make sure the calculation model of wellhead back pressure;analysed the influence of temperature,joint,pipe circle,thickness of cutting,wellhead back pressure for wellhead pressure.The last give the control process and method for these three MPD under diffrent working condition.This paper established a theory foundation for MPD hydraulic parameter calculation.And have some guidance for improve the scientificness,acuracy of the MPD process.