Design And Research On Key Equipment Of Vertical System For Deep Sea Drilling Riser

In deep drilling,the lower portion of the riser system connecting the BOP stack and the drilling platform,used to isolate the water,the drilling and circulation of drilling fluid to establish a channel.Most of the upper portion of the flexible joint in the riser in sea water.In the marine environment under the action of loads,it is easily deformed riser;if the deformation is too large or prolonged vibration,the riser will decrease the safety factor.In addition also possible to generate friction between the drill string bending and riser,the riser will cause serious failure,accident.To solve this problem,we design a system that can always maintained perpendicular to the riser,the system consists of deep anchoring means,hydraulic means rope,rope with a riser and riser connection system monitoring package devices.Deep anchoring device comprises a suction pile foundation and two upper steel part,a hydraulic effect are the rope means anchored on the seabed.Through surveys,deep seabed sediments around the world,selected the suction pile anchors program.Consider pressure,corrosion,temperature and other factors,in conjunction with the relevant standard environmental parameters and the target area,the deep structure is designed anchoring device;Materials and deep anchoring device has been selected.A method using a sacrificial anode corrosion protective coating and combining means sacrificing the number of anodes calculated theoretically.Using ANSYS software deep anchoring device has been strength check results show that the strength of the apparatus to meet the requirements of supporting the upper structure.Finally,the bearing capacity of the anchoring device theoretical calculation analysis results show the horizontal and vertical ultimate bearing capacity ultimate bearing capacity satisfies the design requirements.The hydraulic rope winch means is a deep,servo valve box,like deep sea hydraulic power source device employs skid module is fixed in the deep anchoring means acts from deep winch straightening riser.Referring to the relevant standards,deep winch,the servo valve housing,and the structure of deep-sea hydraulic power source skid module chassisdesign.The proposed hydraulic deep technology into the present system,a closed loop is formed by a sensor control signal to the pilot valve on the riser,the time to achieve the purpose of pipe straightening compartment.Force magnitude currents are calculated on the whole riser section with the riser and buoyancy module maximum deflection position and size,based on the calculation result of the working environment and the selection of the hydraulic elements.Finally,the principle of hydraulic system design,and simulation of hydraulic system through AMESim software,the results show that the feedback signal and the reference signal can achieve very good follow to achieve the desired functionality.Effect of the rope with riser connection to the wire rope is connected to the riser.Referring to standards,the structure of the rope and riser connection be designed;the material selection.Using ANSYS software rope means connected to the riser strength check results show that the strength of the device to meet the requirements.Water monitoring device package compartment role is to monitor the state of the riser hardware encapsulated,fixed to the riser.A paper sensor selection.Referring to relevant standards,packaged device structure design.And proposed long distance based deep underwater acoustic communication with the hydraulic servo control technology conceivable combination of control flow.In this paper,the step of installation and construction of the system has been designed to meet the practical engineering as possible,while the respective portions of the device cooperate to form a complete vertical riser system.Vertical riser system provides a new method to prevent the flexural deformation occurs in the riser in deep water drilling,deep drilling to ensure the safety.