RU2408764C1 - Sea stationary platform for extraction of hydrocarbons - Google Patents

Abstract

FIELD: oil and gas production. ^ SUBSTANCE: installation consists of drill rig with drive, of platform deck, of hoisting crane, of tender platform, of concrete piles, of borehole, of complex of equipment mounted on platform for collecting, preparing and transporting oil and gas, of risers, and of point moorages. The installation corresponds to a supporting structure of hydro-technical concrete construction deepened into a water basin. Two of concrete piles are hollow inside and are interconnected in their lower part with an arc-shaped bridge of internal diametre commensurable with internal diametres of the first and the second concrete piles. Below sea level and at the point of the sea stationary platform location the first pile is equipped with water intake ports. Internal walls of the first hollow concrete pipe are equipped with guides made as triangles and directed axially to the bottom of the basin. A blade of a hydraulic unit is installed at the joint point of the hollow concrete pipe with soil; the hydraulic unit is arranged in a water proof container on a foundation plate. The container adjoins the first concrete pile. The second pile in its upper part is equipped with a port located above sea level. Diametre of internal surface of the port diminishes in the direction of drainage. ^ EFFECT: increased reliability of sea platform operation. ^ 3 dwg

Description

The invention relates to the oil and gas industry, and more particularly, to facilities for offshore hydrocarbon deposits, mainly located on the continental shelf of the Arctic Ocean.

In accordance with the new Rules for the classification, construction and equipment of floating oil and gas complexes, including the rules for the construction and equipment of subsea production complexes (see, for example, N.Reshetov. The Arctic dictates the rules // Maritime business of the North-West. 2009, No. 1 (14) , p. 43), the objects of arrangement of offshore hydrocarbon deposits are not only floating drilling rigs, offshore stationary platforms, offshore ice-resistant stationary platforms, but also offshore underwater pipelines, underwater production complexes, risers, point nye docks for shipment of hydrocarbons, as well as floating objects, carrying out training, processing, storage and shipment of petroleum products.

The main type of offshore platforms for oil and gas production are platforms made in the form of a structure consisting of one or more reinforced concrete shells buried deep into the reservoir (see, for example, R.I. Vyakhirev, B.A. Nikitin, D.A. Mirzoev. Arrangement and development of offshore oil and gas fields. M., Academy of Mining. - 1999, p. 122.).

The construction of such structures is carried out both from the ice cover and from the surface of the water. Similar designs are used to develop the continental shelf.

The following structures of offshore platforms are known: Uralmash 6000/200 semi-submersible floating drilling rig [1, p.33], SPBU 6500 / 10-30 self-lifting ice-resistant floating drilling rig [1, p.35], two-bearing construction [1, p.123 ] hydraulic engineering reinforced concrete structure, deep in the reservoir, gravity reinforced concrete platform [1, p.124], an artificial island structure with concrete slope reinforcement [1, p.125], an artificial island structure with gently sloping slopes [1, p.126] , artificial island structure with metal a cylindrical skeleton [1, p.12].

Offshore platforms are used (depending on the location of the field) at depths of 6-35, 35-60, 100, 150, 200-250, 260-350 m (Shtokman field) [1, p. 47-49]. Abroad at depths up to 300-600 m [1, p.11].

Distances from the offshore field to the coast also have different lengths. The main underwater pipeline from the Shtokman field has a length of 635 km to the coast of the Kola Peninsula [1, p.17].

When developing oil and gas deposits located under the bottom of the sea, the peculiarities of the climatic, hydrological, and geological conditions are taken into account in connection with the need to choose the method of their development and the corresponding type of marine fishing.

Hydrometeorological factors are fundamental when choosing the type of offshore oil and gas facilities (MNGS). One of the main factors when choosing the type of ice-resistant structures is the ice regime, characterized by a set of parameters (thickness, porosity, salinity, speed and area of ice formations, etc.).

To determine the design of the surface part of the MNGS, information is needed on the possibility of icing in order to include measures to combat this phenomenon in the project.

These circumstances require reliable power supply to MNGS.

Power supply of the oil and gas preparation complex is carried out by a centralized supply of electricity through an underwater cable or power line or using an autonomous power station installed on an offshore stationary platform [1, p.46.].

When using autonomous power sources, gas is used as fuel, and liquid fuel is used only as a backup.

In the climatic conditions of the Arctic Ocean and remoteness from stationary industrial energy sources, the problem of providing the necessary power supply at face value cannot always be provided, which forces the use of a significant number of autonomous power plants operating on different principles (diesel generators, etc.).

The objective of this technical proposal is to increase the reliability of the operation of MNGS by providing power to MNGS located on the continental shelf, mainly in remote regions.

The problem is solved due to the fact that the offshore stationary platform, consisting of a drilling rig with a drive, a deck of a platform, a crane, a tender installation, reinforced concrete piles, a wellbore, an energy supply device, a set of equipment installed on a platform for collecting, preparing and transporting oil and gas, including facilities for the development of an offshore hydrocarbon field: an offshore subsea pipeline, an undersea production complex, risers, berths for hydrocarbons - and which is a supporting structure of a hydraulic engineering reinforced concrete structure, buried deep into the reservoir, differs from the prototype [1] in that two of the reinforced concrete piles are hollow inside and connected in the lower part between themselves by an arc-shaped jumper having an inner diameter comparable with the inner diameters of the first and the second reinforced concrete pile, the first reinforced concrete pile is equipped below the sea level, at the installation site of the offshore stationary platform, with water intake openings, while the inner walls of the first hollow reinforced concrete piles are provided with guides made in the form of a triangle and located axially towards the bottom of the reservoir, at the junction of the first hollow reinforced concrete piles with soil, the impeller of the hydraulic unit is installed, which is mounted in a waterproof container on the foundation plate and adjacent to the first reinforced concrete pile, the second the hollow pile in the upper part is equipped with a hole located at a mark above sea level, the diameter of the inner surface of which decreases towards the drain.

The differences of the claimed technical solution are that two of the reinforced concrete piles are hollow inside and connected at the bottom with an arc-shaped jumper having an inner diameter comparable to the inner diameters of the first and second reinforced concrete piles, the first reinforced concrete pile is provided below sea level, in place installation of a stationary offshore platform, water intake openings, while the inner walls of the first hollow reinforced concrete piles are equipped with guides made in the form of a triangle and arranged axially towards the bottom of the reservoir, at the junction of the first hollow reinforced concrete pile with soil, a hydraulic unit impeller is installed, which is installed in a waterproof container on the foundation plate and adjacent to the first reinforced concrete pile, the second hollow pile in the upper part is equipped with a hole located at the mark above sea level, the diameter of the inner surface of which decreases towards the drain.

The combination of distinctive features of the proposed technical solution allows to provide MNGS with stable autonomous power supply in hard-to-reach regions.

The invention is illustrated by drawings.

Figure 1. General view of MNGS. MNGS consists of a stationary offshore platform, which includes a drilling rig with a drive 1, a deck of a platform 2, a crane 3, a tender 4, an ice field 5, reinforced concrete piles 6, a wellbore 7. The MNGS also includes power supply devices, a set of equipment installed on a platform for collecting, preparing and transporting hydrocarbons, an offshore underwater pipeline, an underwater mining complex, risers, berths for hydrocarbons.

Figure 2. Pile construction. Two reinforced concrete piles 6 are hollow inside, pile 8 and pile 9, and are connected in the lower part between each other by an arched bridge 10 having an inner diameter comparable to the inner diameters of the first 8 and second 9 reinforced concrete piles, the first reinforced concrete pile 8 is equipped with water intakes below sea level holes 11 and 12, while the inner walls of the hollow reinforced concrete piles 8 are provided with guides 13 made in the form of a triangle, located in the axial direction toward the bottom of the reservoir 14, at the junction of the first hollow reinforced concrete of a concrete pile 8 with soil of the bottom of a reservoir 14, an impeller of a turbine 15 of a hydraulic unit 16 mounted on a foundation plate 17 of a waterproof container 18 adjacent to a reinforced concrete pile 8. A second hollow reinforced concrete pile 9 is provided in the upper part with an opening 19 located above sea level 20 or ice field 5. The inner diameter of the reinforced concrete piles 9 decreases towards the drain.

Figure 3. The structural diagram of the hydraulic unit 16. The structural diagram of the hydraulic unit 16 includes: the impeller of the turbine 15, the blades 21 of the guide apparatus, the turbine bearing 22, the brake jacks 23, the stator of the generator 24, the rotor of the generator 25, the bath of the generator bearing and the thrust bearing 26 and 27, respectively, the generator bearing 28, thrust bearing segments 29, thrust bearing mirror 30, turbine oil line 31, process water line 32, distilled water tank 33, oil pressure unit 34, high-pressure air supply line 35, air line low pressure spirit 36.

The hydraulic unit 16 is a hydrogenerator made in the form of a horizontal capsular hydrogenerator, an analogue of which are the hydrogenerators described in the information sources: 1. Patent of the Russian Federation No. 228532. 2. Hydropower. Ed. V.I. Obrezkova. M., Energy Publishing House, 1988 .-- 512 p., P. 301.

An analogue of the foundation plate 17 is the foundation plate described in the description of the patent of the Russian Federation No. 2261956.

The specific type of hydrogenerator is selected based on the depth of the reservoir.

The device operates as follows.

Seawater enters through the intake openings 11 and 12 into the cavity of the pile 8, where through the guides 14, made in the form of a triangle and located in the axial direction towards the bottom of the reservoir 14, the laminar flow is converted into a turbulent flow. The turbulent flow reaches the blades 21 of the guide apparatus, bringing them into rotational motion, and accordingly, the entire mechanical system of the hydraulic unit, and then the electrical system, is launched.

Next, the turbulent flow through the arcuate jumper 10 enters the second pile 9, in which the water flow, reaching the hole 19, is drained to the surface of the reservoir or enters the water supply system, articulated with the hole 19, which can be used to meet the technical needs of MNGS.

When using the claimed technical solution, there is no need to build transmission lines in remote areas, for example in the Arctic region.

Information sources

1. R.I. Vyakhirev, B.A. Nikitin, D.A. Mirzoyev. Arrangement and development of offshore oil and gas fields. M., Academy of Mining Sciences. - 1999.

Claims (1)

Offshore stationary platform for hydrocarbon production, consisting of a drilling rig with a drive, a deck of a platform, a crane, a tender installation, reinforced concrete piles, a wellbore, an energy supply device, a set of equipment installed on a platform for collecting, preparing and transporting oil and gas and including facilities offshore hydrocarbon field: offshore subsea pipeline, subsea production complex, risers, berths for hydrocarbon shipment and representing the supporting structure of a hydraulic reinforced concrete structure buried deep into the reservoir, characterized in that two of the reinforced concrete piles are hollow inside and connected at the bottom by an arc-shaped bridge having an inner diameter comparable with the inner diameters of the first and second reinforced concrete piles, the first reinforced concrete it is provided below sea level, at the installation site of the offshore stationary platform, with water intake openings, while the inner walls of the first hollow reinforced concrete pile are equipped with guides made in the form of a triangle and located axially towards the bottom of the reservoir, at the junction of the first hollow reinforced concrete piles with soil, a hydraulic unit blade is installed, which is installed in a waterproof container on the foundation plate and adjacent to the first reinforced concrete pile, the second hollow pile in the upper part equipped with a hole located at a mark above sea level, the diameter of the inner surface of which decreases towards the drain.

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