Semi-submersible drilling platform with inclined stand column

Abstract

The invention discloses a semi-submersible drilling platform with inclined stand columns. The semi-submersible drilling platform comprises buoyancy tanks, a deck and a drilling system; two buoyancy tanks are arranged in parallel, and stand columns are arranged at the two ends of the buoyancy tanks; the deck is arranged at the tops of the stand columns; the two buoyancy tanks are connected througha cross brace; the stand columns incline in the direction away from the central axis of the deck; and the drilling system is arranged on the deck. According to the semi-submersible drilling platform,the middle parts, near the water surface, of the stand columns are designed in the form of a cone with a small upper part and a large lower part; on the one hand, the cone is used for transitional connection between the upper parts of the stand columns and the lower parts of the stand columns, and on the other hand, an anti-ice effect is achieved; and when the platform is drilled in an ice area, floating ice, near the stand columns, can climb up to the stand columns along with the cone, due to the existence of the cone, the acting force of the platform on the ice can converted from horizontalextrusion to upper and lower ice breaking when the platform moves up and down or shakes left and right

Description

technical field [0001] The invention relates to a semi-submersible drilling platform with inclined columns, belonging to the technical field of offshore engineering drilling platforms. Background technique [0002] Drilling platforms are important equipment for the exploration and development of deep-water oil and gas fields. Their safety is the basis for resisting the harsh marine environment. At the same time, in the face of low oil prices, only self-economic drilling platforms will have a place in the fierce competition. We must find ways to reduce platform construction costs ; In addition, with the increase of human activities in the Arctic, more and more oil and gas exploration and development in the Arctic require drilling platforms that can resist cold and ice. Therefore, reducing the cost of the drilling platform, improving the stability performance, and increasing the anti-icing operation ability are conducive to reducing the huge impact of low oil prices on offshor...

AI Technical Summary

Problems solved by technology

[0003] The semi-submersible drilling platform is the most widely used drilling equipment in the ocean engineering field, and has played an important role in the exploration and development of deep-water oil and gas fields. space, and the anti-icing performance is poor, needs to be improved

The traditional semi-submersible platform has four upright columns. In order to meet the needs of drilling depth, hook load and deck variable load, the columns need to be designed to a larger size to provide sufficient buoyancy. However, the columns above the water surface ( Generally more than 20m in height) actually does not need such a large size, just enough to support the weight of the upper deck and sufficient strength, so the column scale above the water surface can be optimized; on the other hand, the larger deck on the deck can be variable The load will increase the center of gravity. In order to meet the stability requirements, either increase the size of the columns or increase the spacing of the columns. The increase in the spacing of the columns will increase the span of the upper deck, thereby increasing the steel consumption of the deck.

The combination of these two aspects will increase the overall steel consumption, which will also lead to an increase in displacement, thereby further increasing the steel consumption

In addition, the traditional vertical column semi-submersible platform has poor anti-icing performance, which is not conducive to drilling and workover operations in ice areas such as the Arctic

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