RU2479459C1 - Method for lifting, moving and installing surface facilities of offshore fields of hydrocarbons in underwater-ice position - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to development of mineral resources of arctic shelf. The method for lifting, moving and installing surface facilities of arctic offshore fields of hydrocarbons in underwater-ice position is proposed, at which lifting, movement and installation is performed using buoyancy forces. Underwater lifting self-propelled platform equipped with other balancing tanks filled and dried with pumps, propellers of cruising, lagged and vertical movement, automatic systems of target guidance and automatic landing. For coupling to an underwater carrier, the underwater lifting self-propelled platform is equipped with a stock device, and for coupling to the moved object, it is equipped with load clamps. Electric power supply and control of lifting, moving and installation operations is performed via a cable from the underwater carrier. All the operations are carried out under control of unmanned submarines launched from the carrier.

EFFECT: providing the possibility of underwater installation of surface facilities of offshore fields under severe ice and climatic conditions.

3 dwg

Description

The invention relates to the field of development of the mineral resources of the Arctic shelf. The level of development of the scientific and technical base in this area requires the development of new methods and means of mining.

Currently, lifting, moving and installing field facilities is carried out from surface crane vessels. The operation of these vessels depends on weather and ice conditions in the construction area.

For example, a crane vessel with a crane with a lifting capacity of 600 tons and a load lowering depth of 400 meters has limitations on the degree of sea disturbance - not more than 3 points. (Karaev R.N., Portnoy A.S., Razuvaev V.I. “Ships and floating technical means for the development of offshore oil and gas fields”, St. Petersburg, Morintech, 2009).

There is a method of lifting and moving sunken ships (ships) by blowing compressed air to the ship's lifting pontoons. However, it cannot serve as a prototype of the proposed method, because pontoons do not have buoyancy control devices, propulsion systems, automatic targeting systems and grippers and are designed to raise sunken ships, keep ships partially lost buoyancy afloat, reduce draft, etc. (Handbook of a specialist in the emergency and rescue service of the Navy, part IV, Military Publishing, M., 1967)

The waters of the Arctic seas are regions in which ice conditions and gale winds make it difficult or impossible for surface ships to install offshore field development elements for 9-10 months a year.

Submarine vessels equipped to carry out the above work, the global practice of marine work does not have.

The proposed method allows you to transfer the performed operations of lifting, moving and mounting facilities for arrangement of offshore Arctic fields in underwater-ice position.

At the same time, the operation is based on the principle of using adjustable buoyancy of an underwater structure - an underwater load-lifting self-propelled platform (ПГСП).

There are no analogues to such underwater structures.

Structurally, ПГСП consists of 3 strong cylindrical-shaped housings, interconnected.

Two extreme hulls 1 (Fig. 1) provide a change in the buoyancy of the structure, they are strong surge tanks.

In the middle building 2 there is equipment that ensures filling and drainage of equalization tanks, control of movement of the structure, automatic landing of the structure, engagement and disconnection of cargo, electrical equipment that receives electricity from the carrier, and a rechargeable battery.

For docking with an underwater carrier, rod devices 3 are installed on the hulls 1, and cargo grips 4 are used to capture cargo on the case 2.

In order to ensure the accuracy of access to the object, the PSPP is equipped with propellers for marching 5, lagging 6 and vertical 7 movements.

The power supply of the PSPP and the management of operations are made via cable 8 from an underwater carrier.

The operation of the system is as follows:

- a surface vessel during the navigation period delivers oversized cargo to the work area and lowers it onto the ground, after which it leaves the work area, having previously installed a sonar beacon at the place of lowering the cargo;

- underwater carrier delivers PHSP to the place of work;

- ПГСП undocked from the carrier, differentiated by buoyancy and, at the beacon signal, goes to the location of the cargo;

- ПГСП is located above the load and secures the grips;

- pumping water out of equalization tanks, ПГСП creates positive buoyancy, lifts the load, moves it to a predetermined installation location, while automatic targeting and landing systems are used;

- at the installation site, positive buoyancy is extinguished by the intake of sea water into the equalization tanks, and the cargo is installed at a given place;

- cargo captures are given;

PHSP differentiates by buoyancy using pumps and returns to the carrier.

All operations are carried out under the control of uninhabited underwater vehicles released from the carrier.

Claims (1)

A method of lifting, moving and mounting facilities for arranging Arctic offshore hydrocarbon deposits in an under-ice position, in which lifting, moving and mounting are carried out using buoyancy forces, characterized in that an underwater load-lifting self-propelled platform equipped with strong leveling tanks is used to achieve these goals filled and drained pumps, propellers of marching, lagging and vertical movement, automatic targeting systems and automatic landing, while docking with an underwater carrier, the underwater lifting self-propelled platform is equipped with a rod device, for docking with a movable object it is equipped with cargo grippers, and power supply and control of lifting, moving and mounting operations are carried out by cable from the underwater carrier, all operations are carried out under control of uninhabited underwater vehicles produced from the carrier.