JPS6053489A - Water surface floating drilling device - Google Patents

Abstract

PURPOSE:To prevent the damage of riser pipes due to drift ice, etc. by providing derricks on columns connecting a lower hull and a deck and arranging riser pipes in the columns. CONSTITUTION:Substructures 4 and derricks 6 are mounted on the center of columns so that the well centers 7 are located at the center of the columns 2. The column 2 is formed in a double-cylinder type, and a cylindrical spacer 8 passing a riser pipe 5 inside is provided. By suspending the riser pipe 5 through the column 2, its damage due to drift ice, etc. can be prevented.

Description

[Detailed description of the invention] related.

Conventional floating drilling rigs include semi-submersible offshore drilling rigs for drilling offshore oil fields.

This apparatus is shown in FIGS. 1 to 3.

It is composed of a lower hull 1, a column 2, a wooden bar 3, a substructure 4, a riser pipe 5, and a pipe 6, and the riser pipe 5, which is suspended from the substructure 4, is completely passed through.

Excavation is performed using a pipe (not shown) suspended from the derrick 6 on the strafture 4. This center) 7 is located near the center of the ship, and the riser pipe 5 is directly lowered to the sea surface, so in areas with drift ice, the relatively thin riser pipe 5 may be damaged by drift ice, making it impossible to excavate. there were. Note that after excavation, oil is recovered by the riser pipe 5.

In view of the above-mentioned conventional circumstances, the present invention proposes a floating drilling rig that can operate in areas covered with drift ice without using any special equipment to protect the riser pipe.

The gist of the floating excavation equipment according to the present invention is that a derrick is provided on a column that connects a lower hull and a deck, and a riser pipe is provided in the column.
The riser pipe is protected by a relatively rigid column, so it can be operated even in areas with ice floes.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 4 to 6.

In Figures 4 to 6, rowan 1° column 2. The configuration of the deck 3 is the same as the conventional one, but the difference is that the substracture 4 and derrick 6 are installed above the center of column 2, and the well center 7 is moved to the center of column 2, and column 2 is double It is of a cylindrical type and has a cylindrical space 8 through which the riser nozzle 5 can pass.

So, put riser in space 8 of column 2 and put Eve 5.
is the provision. This is done by suspending the riser nozzle 5 from the substracture 4 through the suction 8 in one or three places.
Pass through the pipe suspended from the derrick 6.
Just give in.

Therefore, with the conventional equipment, it was impossible to excavate in sea areas where drift ice 9 exists due to the risk of damage to the riser pipe, but by suspending the riser pipe through the column as in the present invention, the riser pipe can be Since it is protected from drift ice by a strong column, it can be operated even in ice drift areas without special equipment.

[Brief explanation of the drawings] Figures 1 to 3 explain the conventional device.
2 is a plan view, FIG. 2 is a view taken along the line ■-■ in FIG. 1, and FIG. 3 is a view taken along the line ■■-■ in FIG. 1. 4 to 6 are for explaining one embodiment of the present invention, FIG. 4 is a plan view, FIG. 5 is a view taken along the v-■ arrow in FIG. 4, and FIG. It is a vt-vr arrow view. 1...Lower hull, 2...Column, 3...Deck,
5... riser pipe, 6... derrick.

Claims (1)

[Claims] A derrick is provided on a column connecting a lower nozzle and a deck, and a riser slot is provided in the column. A floating drilling rig characterized by being equipped with.