RU2533376C1 - Self-moving drilling ship for operation in arctic conditions - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: self-moving drilling ship has hull made capable to rotate relative to turret mounted in it with vessel mooring system, deck, accommodations, drilling well under turret, technological drilling facilities and drilling rig with drill string passing through turret and well placed on the main deck, propelling-steering complex, power plant located in the hull. Drilling rig with underrig space, technological drilling facilities, deck walkways and accommodations of vessel are winterized - protected against adverse environmental conditions by safety cages with heating system. Around lower part of drilling well, ring-shaped guard is installed to prevent ice entering. Turret, drilling well and drilling rig with drill string are located in fore part relative to midship section, and accommodations are located in aft part of vessel. The vessel is provided with helicopter deck, system for personnel safe emergency vessel escape in icy conditions, as well as with dynamic positioning system.

EFFECT: improved operational characteristics of drilling ship during prospecting and exploratory drilling on arctic shelf.

1 dwg

Description

The invention relates to the field of shipbuilding, and in particular to marine vessels intended for exploratory offshore drilling on the Arctic shelf, and relates to the creation of vessels with improved operational parameters, including for performing production work, safety and comfortable conditions for the crew in arctic conditions.

A drilling vessel for operation in freezing seas is known (RF patent No. 2136535 dated July 18, 1995 “Drilling vessel”) - a prototype comprising a hull made with the possibility of rotation relative to a turret mounted therein with an anchor holding system for the vessel, a technological unit located on the deck, the complex and the drilling rig and the energy complex and the drilling shaft located in the building.

However, it is not possible to use the well-known drilling vessel (BS) in the conditions of freezing seas, since the drilling equipment, deck crossings and the residential block are icing up. In addition, the turret is exerted by force under the ice passing under the ship’s bottom, which can enter the drill shaft. And finally, in emergency situations, the ship does not provide a safe emergency evacuation of personnel in ice conditions.

The objective of the invention is to increase the operational characteristics of the BS during exploratory drilling on the Arctic shelf in severe hydrometeorological and ice conditions.

The technical result is achieved in that in a self-propelled drilling vessel for operation in arctic conditions, comprising a hull configured to rotate relative to a turret mounted therein with an anchor retention system for the vessel, deck, residential block, drilling shaft under the turret, located on the upper deck of the technological drilling rig a complex and a drilling rig with a drill string passing through the turret and shaft, a propulsion and steering complex, as well as an energy complex located in the housing, according to the invention, a drilling rig with the subterranean space, the technological drilling complex, deck passages and the residential block are winterized. A ring-shaped protection is installed around the bottom of the drill shaft to prevent ice from entering it, with the turret, drill shaft and drill rig with drill string located in the bow relative to the mid-section of the vessel, and the residential block in the stern of the vessel. Moreover, the vessel is equipped with a helipad, an emergency safe escape system for the vessel’s personnel in ice conditions, including an emergency evacuation device and free fall boats located on the deck in the aft part of the vessel. The self-propelled BS is equipped with a dynamic positioning system, including a propulsion-steering complex, which is made of helm columns installed in the stern and in the bow of the vessel.

The location of the turret with a drill shaft and a derrick in the bow of the vessel allows you to orient the vessel with its nose towards the waves, wind and ice on it, thereby reducing the effect of external loads on the vessel and reducing its drift.

The BS is equipped with a double restraint system - a turret anchor retention system and a dynamic positioning system, including a propulsion-steering complex, which is made of helical steering columns installed in the stern and in the bow of the vessel, allowing the vessel to quickly select the optimal position above the operating point in relation to external loads.

The essence of the invention is illustrated by the drawing, which shows a General view of a self-propelled drilling vessel for operation in arctic conditions.

A self-propelled drilling vessel comprises a hull 1 in which a turret 2 with an anchor retention system 3 is mounted, a residential unit 4, a drill shaft 5 under the turret, a technological drilling complex 6 located on the upper deck, and a drilling tower 7 with a sub-space 8. A shelter from adverse environmental influences installed on the upper deck of the protective frames 9 with a heating system of their internal volume (not shown). Deflectors 10 are installed along the inner perimeter of the walls of the mine shaft 5 above the BS waterline, and an annular protection 11 is installed in the lower part of the shaft 5, which can vertically move below the main plane of the vessel, designed to prevent ice from entering the mine. Moreover, the vessel is equipped with a helipad 12 located on the upper deck, as well as an emergency safe escape system for the vessel’s personnel in ice conditions, including emergency evacuation device 13 and free fall boats 14. The self-propelled drilling vessel has a dynamic positioning system including a propulsion and steering complex from the propeller columns installed in the stern and in the bow of the vessel 15.

The operation of the proposed self-propelled drilling vessel is as follows.

A self-propelled drilling vessel for work in arctic conditions approaches the water area of drilling operations, is installed above the drilling point using a dynamic positioning system, namely, helmsman columns 15 installed in the stern and in the bow of the vessel, with its subsequent placement on the anchor retention system 3 through the 2 turret of the vessel .

Drilling operations are being performed at the BS operating point to form a borehole and install an underwater well completion module.

Drilling tower 7 with a pit space 8, a technological drilling complex 6, deck passages and a residential block 4 are sheltered from adverse environmental influences by protective frames 9 with a heating system, as well as an annular protection 11 of the drilling shaft 5 from damage by ice floes allow the crew to work comfortably in conditions Arctic year-round.

In case of emergencies and emergencies, the BS provides an emergency safe escape system in ice conditions, which includes self-propelled free fall boats 14 with the ability to move over an ice or water surface, and an emergency evacuation device 13 for launching on solid or broken ice.

The proposed invention of a drilling vessel allows to increase its operational characteristics when conducting exploratory drilling in harsh Arctic conditions by protecting the derrick with a sub-space, a technological drilling complex, deck crossings and a residential block from snow charges and icing, protecting the drilling shaft from mechanical damage by ice and protection against flooding of the upper deck of the drilling vessel through the drill shaft during drift in stormy conditions or when it transitions under conditions of significant excitement, which guarantees the safe conduct of drilling operations on board the vessel, increases the productivity of drilling equipment while reducing the complexity of the work, and also provides emergency evacuation of personnel in ice conditions using free fall boats, which compares favorably with the prototype.

Claims (1)

A self-propelled drilling vessel for operation in arctic conditions, comprising a hull rotatable relative to a turret mounted therein with a ship anchor system, a deck, a residential block, a drill shaft under the turret, a technological drilling complex located on the upper deck, and a drilling rig passing through turret and shaft with a drill string, propulsion and steering complex, as well as an energy complex located in the housing, characterized in that the derrick with sub-space, technological the complex, the deck passages and the living block are winterized - they are sheltered from the adverse effects of the external environment by protective frames installed on the upper deck with a heating system for their internal volume, deflectors are installed along the inner perimeter of the walls of the well shaft and a ring-shaped protection is installed around its lower part with the possibility of vertical movement below the main plane of the vessel to prevent ice entering the mine shaft passing under the bottom, with the turret, drill shaft and drill hole the rig with the drill string are located in the bow relative to the mid-section of the ship, and the residential block is located in the stern of the ship, while the ship is equipped with a helipad, an emergency safe escape system for personnel in ice conditions, including an emergency evacuation device and free fall boats located on deck in the aft part of the vessel, and a dynamic positioning system, including a propulsion-steering complex, which is made up of rotorcraft installed in the stern and in the bow of the vessel columns.