RU2395746C2 - Gas and oil pipeline in water spaces of seas and oceans - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: gas and oil pipeline in water spaces of sea and oceans, comprising a pipeline and a compressor station, where the pipeline is laid at a depth of 29-15000 m of water surface, is connected to vessels filled with nitrogen gas under pressure 0.01 - 100 MPa; the vessels are at 1.0-10000 from each other; each gas or oil pipeline is connected to compressor stations with gas or diesel engines mounted on floating platforms; the platforms and vessels are fixed to a sea bottom on waterproof-coated cable braces with anchors at a smaller sea depth, and at a greater sea depth the cable braces are connected to the vessels and anchors.

EFFECT: device regulates weight of the pipeline for tension limitation.

1 dwg

Description

The gas and oil pipeline device belongs to the field of the gas and oil industry, namely, it is intended for transporting gas and oil through pipes in the water spaces of the seas and oceans, in the northern regions under ice, and in areas with a warmer climate under a layer of water.

From the patent literature, a gas pipeline device is known in the waters of the seas according to RU 2149304 C1, F16L 1/14, 02/12/1998, 9 pp. (1). In the known method, a gas pipeline device is installed, installed at a depth of 30-2000 m (exceeding the draft of ships), equipped with floats (cylinders).

In addition, from the technical literature it is known to control the mass of the pipeline when laying at great depths to limit excessive stresses. A change in the mass of submarine pipelines can be achieved by equipping the pipeline with pontoons (cylinders). Rigid pontoons in the form of metal or plastic spheres or cylinders can be filled with gas. When using gas, a preliminary increase in pressure in the pontoon is possible to compensate for the external hydrostatic pressure when the pontoon is immersed in water. The buoyancy control of the pipeline near the bottom can be carried out using pontoons with attached chains or cables (P.P. Borodavkin and others. Underwater pipelines. - M .: Nedra, 1979. - P.198-205. Fig. 9-12, 9- 14., p. 64-69) (2).

From the patent literature it is known to equip an offshore oil and gas field in accordance with RU 2296836 C1, ЕВВ 17/00 04/10/2007, 8 pp. (3), including offshore platforms with compressor stations associated with pipelines. Moreover, the pipelines are equipped with float devices (cylinders) with adjustable buoyancy. The specified patent is an analogue of the proposed gas pipeline device.

The disadvantages of the known device of the gas pipeline are:

- at a great depth of 5000 m or more, high pressure arises on the surface of the pipes, which can lead to their destruction;

- the length of the gas pipeline increases due to the changing topography of the sea floor;

- it is impossible to install and operate a compressor station at the bottom of the sea for transporting gas and oil over long distances.

The technical result of the device is to ensure the transportation of gas and oil through a gas pipeline in the water spaces of the seas and oceans.

A gas and oil pipeline device in the waters of the seas and oceans containing pipelines, cylinders, compressor stations, characterized in that each gas or oil pipeline is installed at a depth of 29-15000 m from the surface of the water, each pipeline is connected to cylinders filled with gaseous nitrogen with a nitrogen pressure of 0 , 01-100 MPa, cylinders are installed at a distance of 1.0-1000 m from each other, each gas or oil pipeline is connected to compressor stations, with gas or diesel engines installed on platforms, platform s and cylinders are fixed to the seabed on the tether anchors banners with a small depth of the sea, or in deep sea stretching rope connected to the tanks and anchors.

The drawing shows a General view of the device gas pipeline for transporting gas and oil in the water spaces of the seas and oceans.

The gas and oil pipeline device contains a gas or oil pipeline 1, which is installed at a depth of 29-15000 m from the water surface, each pipeline is connected to cylinders 2 filled with gaseous nitrogen with a pressure of 0.01-100 MPa, the cylinders are installed at a distance from 1.0-1000 m from each other, each pipeline is connected to compressor stations 3, 4 with gas or diesel engines (not shown) installed on platforms 5, 6, platforms and cylinders are fixed to the bottom of the sea on cable extensions 9, connected to cylinders 10 with anchors 11 .Compress The gas station 3 is connected to the casing 12 of the gas well 13. Sensors 14 are installed on the surface of the casing and the oil and gas pipes to warn floating vessels of the location of the gas and oil pipes.

For the connection of gas pipeline 1 with compressor or pumping stations 3, 4, the upper limit of the installation of pipes is taken to be 29 m, and for safe operation of the gas pipeline and sea transport, pipelines are installed by an amount exceeding the draft of sea vessels. The maximum draft of existing ships is 27 m.

The gas pipeline device operates as follows.

From the well 13 through the casing 12, gas under pressure flows directly to the compressor station 3, pipeline 1, compressor station 4 and through the pipeline to the gas consumer.

Oil from the borehole is pumped into the storage tanks installed on the head platform 5 using a deep pump (the deep pump and storage tanks are not shown). From the tanks, oil is supplied to compressor station 3, pipeline 1, compressor station 4, and through a pipeline to an oil consumer.

It should be noted that when lowering the casing 12 to the bottom of the sea to a depth of 5000-150000 m, the dead weight of the pipes exceeds the tensile strength of steel, and therefore, pipe failure can occur, and when installing the casing string on the bottom of the sea floor, stability and their destruction .

Therefore, to prevent pipe breakdowns, casing 15 is fixed to the casing 12, filled with gas under pressure. In addition, cylinders 15 filled with compressed gas can reduce the load on the hook, cable, winch and internal combustion engine (hook, cable, winch and engine are not shown) and ensure safe operation during operation of the well.

And the cylinders 10 reduce the load on the cable 9 of the stretch platform 5 from its own weight, protecting it from destruction.

Claims (1)

The device gas pipeline in the waters of the seas and oceans, containing pipelines, cylinders, compressor stations, characterized in that each gas or oil pipeline is installed at a depth of 29-15000 m from the surface of the water, each pipeline is connected to cylinders filled with gaseous nitrogen under pressure 0, 01-100 MPa, cylinders are installed at a distance of 1.0-10000 from each other, each gas or oil pipeline is connected to compressor stations with gas or diesel engines installed on floating platforms, platform rmy and cylinders are fixed to the seabed on the tether anchors banners with a small depth of the sea, or in deep sea stretching rope connected to the tanks and anchors.

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