RU1824485C - Drilling offshore platform - Google Patents

Abstract

Usage: construction of platforms for drilling and exploitation of oil and gas fields on ice-covered water areas. SUMMARY OF THE INVENTION: An offshore drilling platform includes a drill string protector that is movable and secured in the upper structure and pontoon. The drill pipe string protector is secured with conical dies placed in the slots of the upper structure. The lower end of the protector is sealed to the pontoon by aligning the conical notch of the protector with the protrusion of the pontoon. 3 ill.

Description

cl

with

The invention relates to offshore stationary structures and may find application in the construction of platforms for drilling and exploitation of oil and gas fields in ice-covered areas.

The purpose of the invention is to expand the functionality and increase the reliability of the platform.

Fig. 1 shows a marine drilling platform, general view: Fig. 2 is a section AA in Fig. 1; in Fig.Z - slot deck, top view.

The offshore drilling platform comprises a pontoon 1 comprising wellhead equipment 2 and located at the bottom. The upper structure 3 is supported by supporting columns 4 fixed in the pontoon 1. In

with a volume of 5 support columns 4, pipelines and various communications are located. A protective device 6 is connected to mine.-on 1 and the upper building 3, inside of which a drill string is located. The protective device b is fixed by the dies 7 enclosing it, placed in the slot 8 of the upper structure 3. The dies interact with the lateral surface and with the protrusion 9 of the protective device O. The slot 0 is fastened with the ties established with a certain step 10. The lower end of the protective device b is hermetically fixed to the pontoon 1 by combining the conical recess 11 of the protective device 6 with the protrusion 12 of the pontoon 1. The pontoon 1 is equipped with a number of protrusions 12, the openings of which are closed by hatches, in places where holes can be made.

with y

4 N СО

cl

Work on the platform is carried out as follows.

Well drilling takes place through the internal volume of the protective device 6, i.e. the drill string is protected against ice by device 6. Thanks to the sealed connection of the protective device

6 with pontoon 1, drilling is carried out through wellhead equipment located in the internal volume of pontoon 1. After completion of drilling of one well, all parts of the drilling equipment above the pontoon are disconnected. The protrusion 12 in the pontoon is hermetically closed.

The rearrangement of the protective device 6 is carried out as follows. Dice

7 are removed, the connection 10 is removed and the protective device O is transferred to the next window of the slot 8. After that, the connection 10 is restored. The dies 7 are inserted into the window of the slot 8. By moving the dies 7, covering the protective device 6 and resting on its protrusion 9 down, the protective device is hermetically aligned with its lower end 11c with the protrusion of the pontoon 12. After pumping water from the cavity of the protective device 6, the hatch in the protrusion 12 opens and the structure is ready for the drilling process.

The platform is the result of a new design solution of the protective device and its attachment nodes. When securing the protective device to the upper structure and the pontoon, the well is protected from damage, not dangerous

0

5

0

5

0

5

Claims (1)

hummocking and ice blocks. The attachment design allows the safety device to be repositioned and secured in position. This extends the functionality of the platform. The location of wellhead equipment in the internal volume of the platform increases the reliability and safety of drilling operations. SUMMARY OF THE INVENTION An offshore drilling platform comprising a top structure and a support base connected by support columns, wellhead equipment, a drill string protection device secured with an upper end to the upper structure, characterized in that, in order to expand operational capabilities and increase reliability in the operation of the platform due to the repeated use of the protective device of the drill string, the supporting base is made in the form of a pontoon with wellhead equipment, located in the inner volume of the pontoon, and protrusions rising above the surface of the pontoon at the locations of the boreholes, the lower end of the protective device being connected to the pontoon by combining the protrusion of the pontoon with a conical recess of the protective device, and the upper end of the protective device is connected to the upper structure using conical dies installed in a slot made in the upper structure and combined in plan with a series of pontoon protrusions. 10 Fig / Aa / SS /// /// /// /// // f /// /// / 7 / FIG. / 1824485