RU2156715C1 - Vessel for recovery of hydrocarbons from sea fields - Google Patents

Abstract

FIELD: shipbuilding; vessels for recovery of hydrocarbons from sea fields. SUBSTANCE: proposed vessel has hull with intake cavity located forward from midship section where turret with swivel coupling device is located; vessel is also provided with living module, technological and power complexes. Technological complex is made in form of gas-and- condensate collecting system with inlet line unit; it is engageable with complex for preparation of condensate and gas for transportation; it includes equipment for separation of gas and condensate, condensate stabilization unit and gas compression unit which is made in form of superstructure mounted on upper deck. Inlet line unit, gas-and- condensate separation equipment and condensate stabilization unit are mounted in hold in area of above-mentioned superstructure. Upper deck is provided with guard fire-resisting bulkheads isolating the technological complex from hull. EFFECT: enhanced safety of recovery of hydrocarbons at gas and gas-and-condensate fields. 3 dwg

Description

 The invention relates to the field of shipbuilding and, in particular, to ships for the production of hydrocarbons from offshore fields.

 Known vessels for the production of hydrocarbons from offshore fields, comprising a hull about a receiving cavity in which a turret with a rotary docking device is placed; and having a residential unit, technological and energy complexes (see, for example, the Bluewater vessel "Offshere" journal Vol. 57, August, 1997, p. 134). This vessel is designed for oil production. The disadvantage of this known vessel is that the residential unit is located in the aft end of the vessel. Since the turret always turns under the influence of wind, a fire and explosion in the area of the technological complex can damage the residential module.

 This disadvantage was eliminated in the turret-type mining vessels with the bow arrangement of the residential block and the turret axis shifted to the nose from the mid-section. Today, such vessels are increasingly used.

It is known, in particular, a vessel for the extraction of hydrocarbons from offshore fields, comprising a hull with a receiving cavity located in the nose from the mid-section, in which a turret with a rotary docking device is placed; as well as a residential block located in the nose, technological and energy complexes (see application PCT WO 95/21091, M. Cl ⁶ V 63 V 27/30, 1995 - prototype).

 The disadvantage of the prototype, as well as other well-known ships for the production of turret type hydrocarbons, is that they are intended for use only in oil and gas condensate fields. These vessels provide liquid product from well risers and process the incoming product for separation into crude oil, gas and water, but cannot ensure the safe collection, preparation and transportation of gas and gas condensate field products.

 The technical result of the claimed invention is the provision of the possibility of using a turret for the safe production of hydrocarbons in gas and gas condensate fields.

 This is achieved in a vessel for the extraction of hydrocarbons from offshore fields, comprising a hull with a receiving cavity located in the nose from the mid-section, in which a turret with a rotary docking device is placed; as well as a residential block located in the nose, technological and energy complexes, in that the technological complex is made in the form of a system for collecting gas condensate production of wells with a block of input lines interacting with a complex for preparing condensate and gas for transport, which includes gas separation equipment and condensate installation for condensate stabilization and installation for compression of gas, the latter being made in the form of a superstructure and mounted on the upper deck, and the block of input lines, equipment for The gas and condensate separation unit and the condensate stabilization unit are located in the hold of the vessel in the area of the above-mentioned superstructure, while the upper deck of the hull is equipped with protective flame retardant bulkheads that separate the technological complex from the rest of the hull.

The figure 1 shows the inventive vessel for hydrocarbon production, a side view in longitudinal section;
in FIG. 2 is a plan view of the deck of a hold;
in FIG. 3 is a view A in FIG. 2.

 The inventive vessel for the production of hydrocarbons in offshore fields contains a hull 1 with a receiving cavity 2 located in the nose from the mid-section, in which a turret 3 is placed with a rotary docking device 4 connected to ship pipelines (not shown), as well as a residential unit located in the bow 5 and technological 6 and energy 7 complexes.

 To ensure the possibility of hydrocarbon production from gas and gas condensate offshore fields, the technological complex 6 of the vessel is made in the form of a system 8 for collecting gas condensate well products with a block 9 of input lines interacting with a complex 10 for preparing gas and condensate for transport. The complex 10 includes equipment 11 for separating gas and condensate, a unit 12 for stabilizing the condensate, and a unit 13 for compressing the gas. The installation 13 is made in the form of a superstructure and is mounted on the upper deck 14. Block input lines 9, equipment 11 days of separation of gas and condensate and installation 12 for stabilizing condensate are placed in the hold 15 of the vessel.

 To ensure safety, the upper deck 14 of the hull 1 is equipped with protective flame retardant bulkheads 16 separating the technological complex, and the flare boom 17 is installed in the stern of the vessel.

 The inventive production vessel is installed on the site for many years with anchors 18 and connected to wells or an underwater production complex (not shown) underwater product pipelines 19 (flexible risers). From the rotary device 4, gas under pressure but to pipelines (not shown) enters the premises of the input line blocks 9, where the well products are distributed along the production lines (not shown) of the complex 10 for drying by the low-temperature separation method.

 After the drying process is completed, the commercial gas is supplied to the compression unit 13, which is a booster compressor station with a three-tier arrangement of equipment in a modular block design in the form of a superstructure mounted on the upper deck 14 of the vessel. After the compression process, commercial gas through a rotary device 4 is fed into an underwater trunk pipeline (not shown) for transportation to the shore. The separated condensate is supplied to the condensate stabilization installation 12, after which it is sent through the rotary device 4 for commercialization.

 Thus, the inventive vessel for the production of hydrocarbons provides the entire cycle of production and preparation for transport of gas and gas condensate products, while the barrage flame retardant bulkheads 16 installed on the upper deck 14 separate the technological complex 6 from the rest of the hull 1, thereby creating a safe environment for the maintenance crew vessel.

Claims (1)

 A vessel for the extraction of hydrocarbons from offshore fields, comprising a hull with a receiving cavity located in the nose from the mid-section, in which a turret with a rotary docking device is located, as well as a residential block located in the nose, technological and energy complexes, characterized in that the technological complex is made in the form of a system for collecting gas condensate production of wells with a block of input lines, interacting with a complex for the preparation of condensate and gas for transport, including equipment for sep gas and condensate radios, a condensate stabilization unit and a gas compression unit, the latter being made in the form of a superstructure and mounted on the upper deck, and the input line block, gas and condensate separation equipment and condensate stabilization unit are placed in the hold of the vessel in the region of the aforementioned superstructures, while the upper deck of the hull is equipped with protective flame retardant bulkheads that separate the technological complex from the rest of the hull.

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