RU2567934C1 - Method for hydrocarbon material production and transportation at offshore gas or gas condensate field - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to the area of development of offshore gas or gas condensate fields and may be used for production of hydrocarbon material (HCM). In the method for hydrocarbon material production and transportation hydrocarbon material is produced from underwater and delivered through production manifold through gas main (GM) to onshore HCM receipt complex, at that to GM a gas compressor (GC) is connected, and the above compressor is installed at above-water or underwater offshore oil and gas field structure (OGFS). At GM the first node, intermediate node and the closest to the field node for GC connection are placed in series. The first node for GC connection is placed at maximum closest distance from the production manifold while the closest for field node for GC connection is placed at minimum distance from the production manifold. Production and transportation of HCM is carried out in several stages, at that HCM transportation is made with use of excess formation pressure and pressure generated by GC.

EFFECT: improved economic feasibility of HCM transportation due to usage of excess formation pressure for transportation of produced HCM.

6 dwg

Description

The invention relates to the field of development of offshore gas and gas condensate fields and can be used for the extraction of hydrocarbon materials in the offshore gas or gas condensate field.

The closest analogue of the claimed invention is a method for the production and transportation of CSS in an offshore gas or gas condensate field, in which subsea production of SP and supply of SP through the production manifold through the main gas pipeline (MG) to the onshore PS reception complex, and a gas compressor installed on a surface or underwater oil and gas field structure (NGPS) (patent RU 2296836 C2, E02B 17/00, publ. 10.04.2007).

The disadvantage of the aforementioned technical solution is the low economic efficiency of transportation of the extracted US.

The objective of the claimed invention is to provide a method for the production and transportation of CSS in an offshore gas or gas condensate field without the above drawback.

The technical result achieved by the claimed invention is to increase the economic efficiency of transportation of the extracted US due to the possibility of using excess reservoir pressure to transport the extracted US.

The technical result of the claimed invention is achieved due to the fact that in the method of production and transportation of hydrocarbon raw materials (US) in an offshore gas or gas condensate field, underwater production of the US is carried out and its supply through the production manifold through the main gas pipeline (MG) to the onshore gas reception complex, and to MGs connect a gas compressor (GK) installed on a surface or underwater oil and gas field structure (NGPS), while the first node for connecting the GK, intermediate the main connection unit of the main assembly and the main assembly of the main assembly to the field, with the first assembly of the main assembly located at the maximum possible distance from the production manifold, and the closest assembly of the main assembly to the field at the minimum possible distance from the production manifold, the production and transportation of CSS is carried out in several stages moreover, the transportation of CSS is carried out using excess reservoir pressure and pressure created by the HA, at the first stage, the HA is connected to the first node of the HA, in the wake At the last stage, the main group is connected to the intermediate unit for connecting the main group, and at the last stage, the main group is connected to the nearest main unit for connecting the main group, at each stage they constantly monitor the pressure in the MG, and when it is reduced to a value lower than that required for transportation of the unit for MG, they increase GK outlet pressure by adjusting the GK drive and go to the next stage of production and transportation of CSS.

Connecting and disconnecting the GC from the GC connection nodes located on the MG and moving the surface or underwater NGPS at different distances from the production manifold makes it possible to use the excess reservoir pressure of the extracted US, and not only the pressure created by the booster compressor, for transporting the SC. In addition, the connection and disconnection of the main cable from the connection nodes of the main cable provides the possibility of reducing the distance from the coast to the surface or underwater oil and gas service.

The use of excess reservoir pressure for the transportation of CSS provides an increase in the economic efficiency of transportation of the extracted mineral fluid to the place of its preparation due to the following factors:

- the possibility of eliminating the use of gas compressors installed directly on offshore gas and gas condensate fields during the initial stages of production and transportation of hydrocarbons (for many years);

- optimization of working pressure provided in the technological equipment and allowing to reduce its overall dimensions;

- reducing the initial capital costs of equipment and operating costs by reducing fuel consumption, due to the possibility of using small capacity GCs, as well as reducing the time of using GCs for transporting CSS.

Reducing the distance from the coast to NGPS also provides an increase in the economic efficiency of transporting the extracted OS to the place of its preparation and field development as a whole by reducing the delivery time of service personnel to NGPS, which can hardly be overestimated in offshore offshore conditions.

The invention is illustrated by drawings.

In FIG. Figure 1 shows a diagram of the implementation of a method for the production and transportation of CSS in an offshore gas or gas condensate field with a surface NGPS connected to the first GC connection unit.

In FIG. 2 shows a diagram of the implementation of a method for the production and transportation of CSS in an offshore gas or gas condensate field with an underwater NGPS connected to the first GC connection unit.

In FIG. Figure 3 shows a diagram of the implementation of a method for the production and transportation of CSS in an offshore gas or gas condensate field with a surface NGPS connected to an intermediate GC connection unit.

In FIG. Figure 4 shows a diagram of the implementation of a method for the production and transportation of CSS in an offshore gas or gas condensate field with an underwater NGPS connected to an intermediate GC connection unit.

In FIG. Figure 5 shows a diagram of the implementation of a method for the production and transportation of CSS in an offshore gas or gas condensate field with a surface NGPS connected to the GC connection site closest to the field.

In FIG. Figure 6 shows a diagram of the implementation of a method for the production and transportation of CSS in an offshore gas or gas condensate field by an underwater oil and gas condensate field connected to the closest GC connection site.

A method for the production and transportation of CSS in an offshore gas or gas condensate field can be implemented using surface NGPS 1 or underwater NGPS 10.

On the diagrams of the implementation of the method for the production and transportation of CSS in an offshore gas or gas condensate field (Fig. 1 - Fig. 6), the location on the MG of the connection nodes of the GC of the above-water NGPS 1 or underwater NGPS 10 is shown.

MG 4 connects the underwater mining manifold 2 and the onshore collection point US 3. The following GC connection nodes are sequentially located on MG 4: the first GC connection node, the intermediate GC connection node and the GC connection node closest to the field.

The first GC connection node is located at the maximum possible distance from the production manifold 2.

The GC connection unit closest to the field is located at the minimum possible distance from the production manifold 2.

The intermediate connection node is located between the first and the closest connection node to the field.

The first GC connection unit is equipped with an underwater shelter 5 and a dome 6, and also contains an inlet valve 7, an outlet valve 8, an adjustment valve 9.

The intermediate unit is equipped with an underwater shelter 11, a dome 12, and also contains a gate valve 13, a gate valve 14, a gate valve 15.

The connection site closest to the field is equipped with an underwater shelter 16, a dome 17, and also contains an input valve 18, an output valve 19, an adjustment valve 20.

The number of NGPS locations and nodes connecting GK to MG 4 is determined by the specific characteristics of offshore fields. When connecting the main team to the main site for connecting the main team, a possible exclusion from the constituent elements of the arrangement of the field is provided - underwater shelter 16 and dome 17.

The method of extraction and transportation of CSS is as follows.

Extraction and transportation of CSS is carried out in several stages. At each of the stages, the pressure value in the reservoir pressure MG is constantly monitored, and when it is reduced to a value lower than that necessary for the transportation of the US through the MG, the output pressure of the gas reservoir is increased by adjusting the GC drive and go to the next stage of production and transportation of the US.

On MG 4, the following connection nodes are located: the first group of connections for the main group, an intermediate node for connecting the main group, and the site for connecting the main group close to the field. Arrangement of intermediate GC connection nodes and a GC connection node near the field can be carried out either immediately before the production stage of the reservoir at which a specific GC connection node will be used, or simultaneously with the construction of the first GC connection node after clarifying the field’s operational performance and calculating reservoir pressure at each of the stages of production of CSS. The GC installed at the NGPS provides transportation of the DC to the coastal collection point.

At the first stage of mining, the equipments of the main equipments are equipped with the first GC connection unit at the maximum possible distance from the production manifold, while the first GC connection unit is equipped with an underwater shelter 5 and a dome 6.

GC is connected to MG 4 through the outlet gas pipeline GK to the gate valve inlet 7, and through the outlet gas pipeline GK is connected to the gate valve outlet 8. After that, the first stage of production and transportation of US via MG 4 to the onshore complex for receiving US is carried out.

The location of the first GC connection node at the maximum possible distance from the production manifold allows for a long time (for many years) to use reservoir pressure to transport the US from the production manifold 2 to the installation site of NGPS and the subsequent transportation of the US to the shore assembly point 3 and, therefore, allows at the first stage, minimally use the capacity of the gas condensate complex and abandon their use at the initial stages of production and transportation of gas compressors located directly at the field waiting for transportation of CSS.

If the pressure in MG 4 decreases below the value required for the transportation of CSS, they provide for the use of an intermediate GC connecting unit with underwater shelter 11 and a dome 12.

The place of arrangement of the intermediate node of the connection of the main group is determined on the basis of the following:

- the value of reservoir pressure at which it is possible to transport the US through the MG to the coastal complex for receiving the US, taking into account the pressure created by the booster compressor of NGPS;

- the amount of US reserves in the field.

The DC is disconnected from the first GC connection node and connected through the GK outlet gas pipeline to the gate valve 13, and through the GC outlet gas pipeline to the gate valve 14. After that, the second stage of production and transportation of US via MG 4 to the onshore US reception complex is carried out.

At the second stage of production and transportation of CSS, as well as at the first stage, excess reservoir pressure is used for transportation, but at the same time they increase the use of GC capacities for transportation of CSS.

If necessary, it is possible to equip several intermediate connection nodes. The location of the intermediate connection nodes, as well as the number of equipped connection nodes and the operating time of the oil and gas production system at a particular connection node is determined by reservoir pressure and reservoir reserves.

When MG 4 reduces the pressure necessary taking into account the pressure generated by the main assembly at the intermediate connection unit for the transportation of CSS, it is envisaged to use the closest connecting station to the field with the underwater cover 16 and a dome 17.

ГГ НГПС is disconnected from the intermediate connection node ГК and connected via the outlet gas pipeline ГК to the gate valve 18, and through the outlet gas pipeline ГК - to the gate valve 19. After that, the final stage of production and transportation of the power unit is used up until the resources of the CSS are exhausted.

At the third stage of the production and transportation of CSS, as well as at the first and second stages, excess reservoir pressure is used for transportation, but at the same time they use GCs for transportation of GCs, and when there is a lack of capacity for the transportation of GCs, gas compressors are located directly on deposits for transportation of CSS.

The claimed method of extraction and transportation of CSS allows the use of booster compressors with lower productivity for transportation of CSS, and also provides the possibility of reducing their number and reducing the time of their use in the operation of the field, and also eliminates the use of gas compressors installed at the initial stages of production and transportation of CSS directly at offshore gas and gas condensate fields for transportation of gas up to ~ 200 km, which is relevant for example kmanovskogo gas condensate field, located 600 km from the coast.

Claims (1)

A method of producing and transporting hydrocarbon feedstocks (CSS) in an offshore gas or gas condensate field, in which submarine gas is produced and supplied through a production manifold via a gas main (MG) to an onshore gas reception complex, and a gas compressor (GC) is connected to the MG, installed on a surface or underwater oil and gas field structure (NGPS), characterized in that the first group of gas connection, the intermediate connection of gas and the closest node to the field are sequentially placed on the MG GC connections, with the first GC connection node being placed at the maximum possible distance from the production manifold, and the GC connection node closest to the field is placed at the minimum possible distance from the production manifold, UC is extracted and transported in several stages, and the UT is transported using excess reservoir the pressure and pressure created by the HA, at the first stage, the HA is connected to the first node of the HA connection, at the next stage, the HA is connected to the intermediate node GC and at the last stage of the GC are connected to the GC connection node closest to the field, at each stage they constantly monitor the pressure in the MG, while decreasing to a value lower than that required for the transportation of US through the MG, the GC output pressure is increased by adjusting the GC drive and proceed to the next stage of the extraction and transportation of CSS.

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