Ultra-deepwater offshore oil-gas engineering developing system and mounting method thereof

Abstract

The invention discloses an ultra-deepwater offshore oil-gas engineering developing system and a mounting method thereof. The ultra-deepwater offshore oil-gas engineering developing system comprises a water-surface floating production device, a stand pipe supporting pontoon, an underwater oil extraction device, an upper part flexible jumper pipe, a lower part rigid stand pipe and a seabed well mouth device; the underwater oil extraction device is arranged on the stand pipe supporting pontoon; and benthonic oil-gas resources finally reach the water-surface floating production device through the seabed well mouth device, the lower part rigid stand pipe, the stand pipe supporting pontoon, the underwater oil extraction device and the upper part flexible jumper pipe. According to the ultra-deepwater offshore oil-gas engineering developing system disclosed by the invention, the huge weights of underwater stand pipes and an oil extraction device are borne by the stand pipe supporting pontoon, and the dynamic load to be borne by the water-surface floating production device is reduced, thus the design requirements on the water-surface floating production device are reduced; in addition, the underwater oil extraction device is arranged on the stand pipe supporting pontoon, thus the ultra-deepwater oil-gas extraction operation can be carried out by the mesopelagic water-surface floating production device and the oil extraction device, the investment cost is rather largely reduced, and the installation and the maintenance are facilitated.

Description

technical field [0001] The invention relates to an offshore oil and gas development technology, in particular to an ultra-deep water offshore oil and gas engineering development system and an installation method thereof. Background technique [0002] With the gradual depletion of oil and gas resources in land, offshore and middle-deep sea areas, in order to meet the huge demand of human beings for oil resources, the development of deep sea (500-1500m) and ultra-deep sea (above 1500m) oil and gas fields is the main growth point of the world oil industry. [0003] At present, the typical deepwater offshore oil and gas engineering development model in the world is "surface production device + riser system + subsea production system", in which the surface production device includes a floating structure and an upper oil and gas processing system. As the only structure connecting the surface part and the subsea production system, the riser system is an important part of offshore o...

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Problems solved by technology

[0006] Based on the above problems, the current limited working water depth of TLP platform is about 1500m, and the limited working water depth of semi-submersible platform is about 3000m, and the construction cost, operation cost and maintenance cost of these traditional surface production devices applied in deep sea are high

[0007] In addition, traditional offshore oil and gas field development operations can only be carried out after all facilities are in place, which seriously delays the operation period and reduces the efficiency of production operations, thereby increasing the cost of oil field development

[0008] In addition, the environmental conditions of ultra-deep sea are usually very harsh. In addition to the problem of water depth, there are also effects such as hurricanes and typhoons. Traditional floating production units have no effective technology to prevent typhoons and hurricanes

[0009] Based on the above problems, in the ultra-deep sea environment, the safety, environmental protection, feasibility and economic applicability of traditional offshore oil and gas field development engineering equipment and engineering models cannot meet the requirements

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