The three-leg simple
wellhead platform comprises an upper module, a jacket, a
pile foundation and a
drill conductor, the jacket is of an upper structure with a compact section, the upper structure is located in a wave and high-flow-speed
ocean current acting area, and the wave and current force borne by the jacket can be effectively reduced; and the base plate is transited to a large-section lower structure through a transition structure, so that the enough large base plate size is provided to ensure the stability of the platform and reduce the stress of the
pile foundation, and the base plate can adapt to severe environment conditions of
open sea areas with the
water depth of 100 meters. Meanwhile, the upper module is mainly provided with an oil-gas metering facility, a
chemical agent system, an opening and closing exhaust
system, an
electrical room and a helicopter
deck, drilling and repairing machines and tools, living buildings, oil-gas-
water treatment facilities, public water facilities, a main power source, an emergency power
source system and the like are not arranged, and
system facilities on the upper portion of the platform are greatly simplified; and unmanned operation of the platform can be realized, and the investment and operation cost of the platform can be greatly saved.