The Study Of Hydrodynamic Performance Of Jack-up Platform

Oil, natural gas is both an important industrial energy and important strategic materials. In the worldwide the development of exploit oil and gas have turned to sea. Offshore platform is the main development tools, the jack-up drilling platform is the most widely used one of the product platform in the world.Through the physical model experimental investigation has been carried out to study hydrodynamic performance of jack-up platform according to the our country own design of a jack-up drilling platform.The experiment contents include:the movement inherent cycle and RAO, mooring test and the air gap height and pile boots force test under extreme storms.From integrating physical model experiments the result as follows:(1) In this paper test range, the corresponding movement inherent cycle of surge, sway were greater than 60 s, the corresponding movement inherent cycle of heave were nearby 60 s, the corresponding movement inherent cycle of roll pitch yaw were nearby 12 s.(2) In this paper test range, The swing motion component appear larger value under the dynamic function of direction 0°to 45°, within the range of the biggest swing was 4.8 m. The sway motion component appear larger value under the dynamic function of direction 67.5to 112.5°, within the range of the biggest sway changed between 7.5m to14.7m.The environment load angle change less effect on roll,pitch and heave, the biggest roll was 4.03°, the biggest pitch was 3.34°.The heave was smaller than surge and sway,the maximum changes between i0.2 m to 0.59 m. The yaw motion component appear larger value under the dynamic function of direction 67.5°to 135°, within the range of the biggest sway changed between 7.5°to 17.5°.112.5°which is the environment load Angle is the maximum motion response angle in the mooring state.(3) In this paper test range, low frequency motion account for a large proportion of platform's surge,sway,yaw, wave frequency motion account for a large proportion. Wave frequency motion account for a large proportion of platform's pitch,roll,heave. With the increasing depth of the platform's draft, low frequency motion account for a larger proportion of platform's pitch and roll.(4) In this paper test range, mooring force's maximum was 41.79t under full weight of jack-up platform when the environment load angle was 112.5°.When the environment load angles were less than 45°,the moored platform should be in the condition of full weight. When the environment load angles were more than 45°,the moored platform should be in the condition of light weight.The mooring force's main control motion component were sway and yaw.(5) In this paper test range,the air gap's minimum appeared that the direction of extreme storm was 0°,30°,150°.When the direction of extreme storm was 120°the piling force, pull force and horizontal force pile were large, the state was dangerous. When the direction of extreme storm was 60°the piling force, pull force and horizontal force pile were little, we can select this angle to meet extreme storm. Under extreme storm conditions wave force plays a leading role...