The offshore oil and gas exploitation TLP's hydrodynamic performance is computed, and analyzed by using 3-D potential theory, API of wind and JONSWAP of wave in terms of hydrodynamic coefficients, 1st-order wave load, 1st-order motion response and 2ndorder difference frequency wave load. The results indicate that the 1st-order wave load on TLP of the out-of-plane presents a rapid decreasing trend with the increase of wave frequency. Heave/roll/pitch reach their peaks at the wave frequency 0.4 rad/s, the heave displacement is no more than 5% of water depth and the roll angle less than 5°. It is shown that TLP can effectively avoid wave/wind frequency concentrated areas, and safely work in variety of sea conditions. The 2nd-order difference frequency wave load in the y direction is about 4 times as large as the force in the x direction. Compared with the 1st-order wave loads, the 2nd-order difference frequency wave load is relatively small, but the damage for TLP can not be ignored.

offshore oil and gas exploitation tension leg platform (TLP)  /  1st-order wave load  /  1st-order motion response  /  2nd-order difference frequency wave load