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EP0331295A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Pipeline system to separate at least a two-phase fluid flow

Assignee: Norsk Hydro ASA
•
Filing: 1989-02-03
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Granted: —
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Expires: 2009-02-03
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Abstract

Abstract An integrated system for separation of gas, from a two-phase flow of oil and gas, in a secondary riser. The oil and gas is transported in a pipeline (1), e.g. from an oil well, at the seabed and by risers (2, 3) onto the platform. The main riser (2) for transporting oil is connected to an oil storing tank (4) situated on the platform. The secondary riser is connected via a T-junction (5) to the pipeline (1) at a distance (X) from the main riser and leads to a gas scrubber (6) on the platform. The secondary riser contains a regulating valve which is operated by controlled means in such a way as to keep the interface between the gas and the oil at a relatively constant location in the pipeline between the T-junction and the main riser. The section of the pipeline (1) between the T-junction (5) and the main riser (2) incorporates sensors for detecting the proximity of the interface.

Inventors

  • 👤 Oyvind Kaasa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 14:59
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/005; E; E21; E21B; E21B43/00; E21B43/34; E21B43/36; E21B2200/00; E21B2200/09

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 137 words
A system for the separation underwater into phases of a fluid flow having at least two phases, such as oil and gas from a seabed oil well, said system comprising an underwater pipeline, a main riser connected to the pipeline and a secondary riser connected to the pipeline upstream of the main riser via a T-junction wherein the secondary riser ascends to a separation plant and includes flow restriction means, characterised in that the T-junction 5 is positioned along the pipeline 1 a prescribed distance from the main riser 2, the flow restriction means 7 is a controlled regu­lating valve, and there is controlling means 8 responsive to the position of the liquid gas interface along the pipeline for controlling the setting of the regulating valve so as to maintain the position of the said interface constant.
Claim 2
Independent Claim 137 words
A system for the separation underwater into phases of a fluid flow having at least two phases, such as oil and gas from a seabed oil well, said system comprising an underwater pipeline, a main riser connected to the pipeline and a secondary riser connected to the pipeline upstream of the main riser via a T-junction wherein the secondary riser ascends to a separation plant and includes flow restriction means, characterised in that the T-junction 5 is positioned along the pipeline 1 a prescribed distance from the main riser 2, the flow restriction means 7 is a controlled regu­lating valve, and there is controlling means 8 responsive to the position of the liquid gas interface along the pipeline for controlling the setting of the regulating valve so as to maintain the position of the said interface constant.
Claim 3
Dependent Claim 39 words
A system according to Claim 1 wherein the controlling means includes sensing means K₁ to K₅ located at least along the pipeline between the main riser 2 and the T-junction 5 connecting the secondary riser 3 to the pipeline.
Claim 4
Dependent Claim 29 words
A system according to Claim 2 wherein the sensing means comprises a sequence of capacitive detectors K₁-K₅ in the pipe­line, each responsive to the proximity of the gas/liquid interface.
Claim 5
Dependent Claim 39 words
A system according to Claim 2 wherein the sensing means comprise pressure sensors and the latter are arranged also in the scrubbing means 6 and in tank storage means 4, both of which means are within the separation plant.
Claim 6
Independent Claim 39 words
A system according to any preceding claim wherein the distance between the T-junction 5 which connects the secondary riser 3 to the pipeline 1 and the main riser 2 is at least twice the height of the main riser.
Claim 7
Independent Claim 26 words
A system according to any preceding claim wherein the portion of the main pipeline situated between the two risers is inclined upward away from the T-junction.
Claim 8
Dependent Claim 13 words
A system according to Claim 6 wherein the angle of inclination is 2°.

References Cited (Backward Citations)

FR2401379A1 Cited
WO1987001759A1 Cited
US4708793A Cited

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