Offshore natural gas extraction method

FIELD: oil and gas industry.

SUBSTANCE: method includes the thermal effect on the gas hydrate deposit, followed by the collection of gas by a dome-shaped collector and transferring it to storage tanks. The effect on the gas hydrate deposit is carried out using the thermal energy of the underwater explosion directed towards the bottom, using an explosive.

EFFECT: increase of efficiency of heat supply to the gas hydrate occurrence zone.

2 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: according to the method upper layer of gas hydrate mass is melted gradually by heating gas hydrate mass in bottom sediments of a water body up to temperature of 50-60°C. Heating is made by a heating element made as blade edge located along diameter of a cargo container lowered from a flotation device. The flotation device is made as a mobile underwater vehicle with retractable tract in the form of a container equipped with blade edge in the bottom part connected to heating elements inside container. Stability of the mobile underwater vehicle is endured in regard to the bottom of the water body. Container is rotated and electric current is supplied to heating elements. Gas hydrate stratum is heated up to 50-60°C. The container is lowered with rotation to the gas hydrate stratum with provision of single-point recovery of hydrates from the above stratum in solid state.

EFFECT: reduced material and operational expenditures and ecological consequences at gas hydrate extraction territory.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes production of gas hydrates, their transportation to a consumer and decomposition of gas hydrates with gas recovery. Gas hydrate recovery process is implemented at thermodynamic parameters corresponding to formation of gas hydrates. Transportation of gas hydrates is performed in sealed and heat insulated cargo spaces of a vehicle at thermodynamic parameters excluding decomposition of gas hydrates. Decomposition of gas hydrates with gas recovery upon completed transportation is made by reduction of pressure in cargo space of a vehicle up to atmospheric pressure. Process of gas hydrate recovery and their storage during transportation is carried out at temperature of -0.2°C and pressure of 1 MPa. At that gas hydrates are withdrawn in hydrate state as briquettes by n-containers run down in sequence to submarine reservoir of gas hydrates from a submarine vehicle. The submarine reservoir of gas hydrates is heated up by heating elements located at edges of n-containers. Each n-container is buried in sequence to submarine reservoir of gas hydrates to the depth twice exceeding the container height. Upon loading of each n-container by free falling of gas hydrates they are loaded to cargo space of a vehicle. The vehicle is made as a submarine vessel. While heating submarine reservoir of gas hydrates only reservoir section under the container is heated. Containers are filled with gas hydrates represented by briquettes of natural metastable mineral in hydrate solid state.

EFFECT: improving efficiency in recovery and transportation of gas hydrates due to reduced consumption of energy and reduced capital and current costs.

2 cl, 1 dwg

FIELD: mining.

SUBSTANCE: method comprises mechanical destruction of seafloor layer by an stripping knife moving along the seafloor, and transportation of destruction products to the surface. The products of destruction are placed in elastic, gas-tight shells, which are collected along the surface and transported them to the place of use in the transportation vessel refrigerators. The combine is a moving platform with a knife for seafloor cleaning with the mounted video camera and the stripping knife under the hole in the platform designed as a horizontally rotating cylinder with the scrapers mounted on it. The platform has two mounted cylinders, the first is a container with shells located horizontally one above another one, and the second one, mounted above the hole, is a loading container in the top side of which the segments with drive mechanisms shifting them from the cylinder axis are located.

EFFECT: improvement of efficiency of ocean production of gas hydrates.

4 cl, 2 dwg

FIELD: mining.

SUBSTANCE: device comprises a clamshell ladle fitted with levers with bosses and flexible links, a sensor, a flexible cavity, a float. The device is also fitted with the vessel designed as a bent cylinder with the tapered extended cylindrical part which is inclined to the opposite side from the self-contained unit and through the frame is interconnected with it. The vessel is fixed on a cable with a possibility of vertical movement. The extended cylindrical part of the vessel is fitted with a sensor interacting with a sensor located in the container under a flexible cavity which is filled with liquid with a specific gravity, less than that of environment. The unloading hole of the extended cylindrical part of the vessel is fitted with the throwing-back tray. The distance from the clamshell ladle centreline to the tray in the thrown-back situation and distance from the lower edge of the clamshell ladle to the tray in the thrown-back situation are determined by the mathematical relations given in the description.

EFFECT: improvement of efficiency of underwater development of minerals.

5 cl, 3 dwg

FIELD: mining.

SUBSTANCE: device comprises a delivery pipe for supply of minerals designed from top to bottom with a bell and a pipeline for coolant supply. The delivery pipe is designed as variable section pipe with formation of alternating cylindrical compartments with inlets and outlets, and the top parts of some compartments are arranged with inclination as cross-lying with reference to other compartments, and the lower parts of compartments are designed conical, interconnected with coolant supply pipelines. Outlets of compartments are located from inlet holes at the distance necessary for passing and maintaining of soil and ice bodies in a suspension provided that: L≥3·dmax, where L - is the distance between inlets and outlets of compartments, dmax - maximum diameter of soil and ice bodies.

EFFECT: improvement of efficiency of production of minerals from continental shelf.

1 dwg

FIELD: mining.

SUBSTANCE: device includes a conveying capacity in the form of a grab bucket provided with levers with thrusts and flexible links, a start sensor located in a container and a flexible cavity. The latter is filled with liquid with a capsule located in it and containing reagents. A capsule throw valve is located at the top of the flexible cavity. Radio beacons are fixed inside the container, on its side walls, and coupling rings are located on the outside. Sodium chloride (3%) and sodium hypochloride (0.3%) are used as reagents.

EFFECT: improving efficiency of operations.

2 cl, 2 dwg

FIELD: mining.

SUBSTANCE: device includes a grab bucket with armoured jaws and flexible links by means of which the bucket is connected to a gas generator and to a flexible cavity start-up sensor, which are located in a container, and a float. The grab bucket is made from elastic material, and a flexible cavity is equipped with a cable located inside the cavity in the centre, the lower end of which is attached to a partition wall additionally installed between a gas generator and the flexible cavity, and the upper end of the cable is attached to the float. As the elastic material of the grab bucket there used is for example thermopolyutherane. The upper edge of the grab bucket is perforated. Armoured jaws of the grab bucket are provided with holes uniformly distributed throughout the surface area. A full air discharge valve is located at the top of the flexible cavity. The float is made in the form of a radio beacon.

EFFECT: improving efficiency of operations.

6 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: system contains at least one modular shaft with the central unit placed under water and an uprise buried to the ocean bottom and at least one air-lock chamber to transport duty shifts of workers, materials and equipment. Besides the system comprises at least one drilling area with a horizontal tunnel branched from the uprise in the central unit, and an inclined area for delivery of drill pipes and a vertical area in which bottom part there is a wellhead of at least one well. A power cable and control systems as well as pipeline in the protective shell for oil and gas transportation are connected to the modular shaft.

EFFECT: increasing development efficiency of subsea oil and gas deposits.

9 cl, 56 dwg

FIELD: mining.

SUBSTANCE: proposed device comprises mineral feed pipe aligned inside hollow pipe with funnel at its bottom, and coolant feed pipeline. Additionally, this device comprises coolant feed pipelines distributed uniformly over hollow pipe perimeter, in funnel walls and in extra struts of said funnel. Hollow pipe is located at the level of funnel strut. Funnel strut inner walls are perforated. At the level of funnel, hollow pipe has vertical cut-outs furnished with plugs from top and bottom. Funnel strut top parts are also equipped with plugs.

EFFECT: continuous mining, lower power consumption and extraction costs, minimised negative effects on contamination of environments.

2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method for development of methane hydrates is based on their breaking by water jets at a temperature of more than 285K with the rate more than 1 m/s in a pulse mode with a frequency in the range from 1 up to 200 Hz, gasification and lifting from the seabed. A device for development of methane hydrates contains a floating device, handling equipment, a power generating unit, pipelines, a control unit and an underwater methane hydrate development unit in which body there is an installed infrared heater, a water-jet monitor with pressurised water feed equipment and a gas bleeder.

EFFECT: improvement of energy efficiency for underwater development of methane hydrates and their lifting to the floating device.

2 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: this invention relates to protective device intended for prevention of fluid leaks into ambient water. Proposed device comprises dome-like fluid impermeable membrane. Besides, it incorporates individual-control floating devices attached to membrane for its positioning and stabilisation. To extract fluid, membrane is provide with discharge hose. The latter comprises also said individual-control floating means for positioning and stabilisation of discharge hose. Note here that said individual-control floating means are underwater apparatuses.

EFFECT: higher accuracy and ease of positioning.

7 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to facilities intended for production of natural gas freed at gas-evolving bottom areas and gas evolved in result of induced flowing of gas hydrates. Offshore gas and gas hydrate production plant consists of double-layer polymer film (reinforced and heat insulating), heat generators at the bottom, heat generators in-built to ceramic plates and heat generator run at the rope along vertical trajectory in gas discharge pipe and magnetohydrodynamic generator. At natural flowing dome of gas collector made of the above film is risen above the bottom at capronic ropes for the purpose of natural filtration from hydrogen sulphide. Otherwise the bottom is covered with the above film for netter heating of gas hydrate at its withdrawal at induced flowing.

EFFECT: invention ensures simplified design for the equipment.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method upper layer of gas hydrate mass is melted gradually by heating gas hydrate mass in bottom sediments of a water body up to temperature of 50-60°C. Heating is made by a heating element made as blade edge located along diameter of a cargo container lowered from a flotation device. The flotation device is made as a mobile underwater vehicle with retractable tract in the form of a container equipped with blade edge in the bottom part connected to heating elements inside container. Stability of the mobile underwater vehicle is endured in regard to the bottom of the water body. Container is rotated and electric current is supplied to heating elements. Gas hydrate stratum is heated up to 50-60°C. The container is lowered with rotation to the gas hydrate stratum with provision of single-point recovery of hydrates from the above stratum in solid state.

EFFECT: reduced material and operational expenditures and ecological consequences at gas hydrate extraction territory.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes production of gas hydrates, their transportation to a consumer and decomposition of gas hydrates with gas recovery. Gas hydrate recovery process is implemented at thermodynamic parameters corresponding to formation of gas hydrates. Transportation of gas hydrates is performed in sealed and heat insulated cargo spaces of a vehicle at thermodynamic parameters excluding decomposition of gas hydrates. Decomposition of gas hydrates with gas recovery upon completed transportation is made by reduction of pressure in cargo space of a vehicle up to atmospheric pressure. Process of gas hydrate recovery and their storage during transportation is carried out at temperature of -0.2°C and pressure of 1 MPa. At that gas hydrates are withdrawn in hydrate state as briquettes by n-containers run down in sequence to submarine reservoir of gas hydrates from a submarine vehicle. The submarine reservoir of gas hydrates is heated up by heating elements located at edges of n-containers. Each n-container is buried in sequence to submarine reservoir of gas hydrates to the depth twice exceeding the container height. Upon loading of each n-container by free falling of gas hydrates they are loaded to cargo space of a vehicle. The vehicle is made as a submarine vessel. While heating submarine reservoir of gas hydrates only reservoir section under the container is heated. Containers are filled with gas hydrates represented by briquettes of natural metastable mineral in hydrate solid state.

EFFECT: improving efficiency in recovery and transportation of gas hydrates due to reduced consumption of energy and reduced capital and current costs.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to HC underwater production, in particular to systems connecting the field facility and underwater wells. Oil and/or gas underwater production system contains central production facility, many underwater wells, fluid transportation network and separate power supply and data exchange network. The transportation network connects each well with the central production facility. The power supply and data exchange network is intended for DC and data supply, it is in-line connected with each underwater well.

EFFECT: invention ensures power supply to long distances, increases system flexibility.

16 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to shelf drilling. A drilling ship includes the first drilling centre including a storage for the first marine risers, the second drilling centre for drilling of the second well from the same ship, which includes a storage for the second marine risers. The latter have a diameter that is smaller than that of the first marine risers. The ship includes two blowout preventers for the second drilling centre. A drilling method provides for creation of a drilling ship with two separating and different drilling centres, each of which is capable of well drilling; provision of marine risers for each drilling centre; diameter of marine risers for one of the drilling centres is smaller than that of marine risers for the second drilling centre; provision of two blowout preventers according to the smaller diameter of a marine riser of an auxiliary drilling centre.

EFFECT: providing drilling of a well from one ship from two different drilling centres, and namely under arctic conditions.

19 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: production platform (1) is suggested with potential connection of branch connection coupled to a production manifold (10) in order to ensure connectivity to the production manifold (10) of at least two production connection strips from the respective subsea wellhead equipment. The production platform is made as a retrofitted module capable to be connected to a single inner tube (11) placed in the production manifold (10). The production platform comprises a frame (2), a pipeline (3), at least one connector (4) and rails (9). The frame (2) is made so that it may be placed on a support device (12). The support device (12) passes from the production manifold (10). The pipeline (3) forms a branching ended by a connector (4) and by at least two external tubes (6).

EFFECT: connection of two production strips to the manifold and reduction of boring rig time in the well.

9 cl, 4 dwg

FIELD: construction.

SUBSTANCE: invention relates to the devices for joining and connecting the first and second pipelines, containing the ends (E1, E2) of the first and second pipes at the sea bottom in the place of connection. Connecting device (10) comprises the first connecting part (1), holding the end (E1) of the first pipeline; the second submersible connecting part (2), holding the end (E2) of the second pipeline and connector (3), disposed between the connecting parts (1, 2) for the final connection of ends (E1; E2) of pipes inter se. The guiding device (5) cooperates with the guiding structure (4) during lowering of the second connecting part (2) to the first connecting part (1) and rotates the second connecting part (2) for preliminary alignment of the end (E2) of the second pipeline towards the end (E1) of the first pipeline, so that the first and second pipelines are brought to the alignment with each other at the sea bottom. Auxiliary inclined structure (6) with stop surfaces and guide means cooperates with the second connecting part (2) and facilitates the precise alignment of the ends (E1, E2) of pipes.

EFFECT: improvement of joining and connection.

14 cl, 13 dwg

FIELD: electricity.

SUBSTANCE: system and method of activation of underwater power consuming devices supplied with alternating current. System contains surface ship, underwater inverter and surface components installed on the surface ship. The inventor is made with possibility of underwater location and reception of DC power supplied from the surface ship. The inventor is made with possibility of DC power conversion to AC power for supply of the underwater consumer. The inventor is connected with cathode. Surface components are connected with the anode made with possibility of installation under water. The anode and cathode create reverse current channel via the sea water. The inventor is made with possibility to ensure three phase AC power for the underwater consumer at controlled frequencies based on control actions of the underwater control module.

EFFECT: invention ensures efficiency increasing of the supply process and control of the underwater consumers.

18 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: system contains at least one modular shaft with the central unit placed under water and an uprise buried to the ocean bottom and at least one air-lock chamber to transport duty shifts of workers, materials and equipment. Besides the system comprises at least one drilling area with a horizontal tunnel branched from the uprise in the central unit, and an inclined area for delivery of drill pipes and a vertical area in which bottom part there is a wellhead of at least one well. A power cable and control systems as well as pipeline in the protective shell for oil and gas transportation are connected to the modular shaft.

EFFECT: increasing development efficiency of subsea oil and gas deposits.

9 cl, 56 dwg

FIELD: pipeline.

SUBSTANCE: invention relates to the flexible ascendant pipelines designed for working in waters encumbered with ice. The ascendant pipeline is equipped with the protection device against the shock caused by waves and drifting ice. The protection device covers at least the upper part of the pipeline and can be removed to the non-operation position at the sea bottom or on board. The protection device is formed by the multitude of separate hollow elements of the blunt-nosed cone shape, which are hanged to one another with chains or wire ropes. When the pipeline is in the removed position, the separate hollow elements can be laid one atop another. The protection device must protect at least the upper part of the ascendant pipeline going from the sea bottom to the floating vessel.

EFFECT: creating the protection device for flexible ascendant pipelines used in waters encumbered with ice.

16 cl, 6 dwg

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