Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-06-11
1991-04-23
Hart, Charles
Gas separation
Means within gas stream for conducting concentrate to collector
55 43, 55189, B01D 1900
Patent
active
050096800
DESCRIPTION:
BRIEF SUMMARY
This invention relates generally to a process and separator system for the separation of gas from liquid and solid media and the conveyance of the gas and liquid without the addition of energy to the separation process utilized.
An object of the invention is to be able to retain a substantial portion of the conveyance energy or transportation pressure throughout the separating process.
The accompanying drawing schematically illustrates an embodiment of the invention.
According to the present invention a process for the transportation of gas and liquid or solid media and the separation of gas from liquid or solid media in a manner so that the pressure in the gas separated off in one separator stage is used for the transportation of separated fluids from a subsequent separator stage, comprising the steps of separating gas off at high pressure in one separator stage or adding it from another gas source and directing said separated or added gas into a separator containing fluid from which gas has been separated at a lower pressure, said higher pressure gas forcing out already separated fluid present in the separator receiving said high pressure gas.
The example of the present invention described herein is a two-stage process, in which the oil and gas are the separated phases and in which no water is separated off and in which there is only one line for removing gas from the process and one line for removing oil.
The separator transportation system of the present invention may be situated, for example, immediately downstream of an oil/gas well or a transportation line.
The process carried out with the separator transportation system has at least one separation stage. If the process includes two or more separation stages, then in the first stage, the contents of high pressure separator 1 will be in a steady state of separation of gas and water, if any, from the oil at a high pressure (approximately equal to the starting pressure in the transport line 8 mentioned hereinafter for stabilized oil). Any water separated off may be fed out of the high pressure separator 1 together with any sand produced via a water transportation line. Any gas from the high pressure separator 1 is fed to separators of a second stage 2, 3, 4 for the purpose of forcing the already stabilized oil from separators of the second stage 2, 3, 4 into the oil transportation line 8.
Separation in the second stage, hereinafter referred to as the low pressure separator cycle, is effected by several identical separators 2, 3, 4 which work in three phases. The separators 2, 3, 4 alternate in carrying out these three phases so that there is at all times one separator carrying out one of the phases.
Phase 1 (Separation)
Gas is separated from oil at the same time as gas is removed at a pressure (necessary transportation pressure for exported gas) lower than that in the preceding separator. For separator 2 to separate gas from oil, the oil inlet valve 16 of the separator is open, its gas inlet valve 25 is closed, its oil output valve 13 is closed, and its gas outlet valve 19 is open. A compression unit may optionally be installed ahead of the export facilities for the separated gas.
Phase 2 (Transportation)
Oil is transported at a high pressure which is in part determined by the necessary transportation pressure for exported oil. For separator 3 to remove oil, the oil inlet valve 17 of the separator is closed, its gas inlet valve 26 is open, its oil outlet valve 14 is open, and its gas outlet valve 20 is closed. Mechanical devices may optionally be installed to reduce the contact surface area of gas and oil.
Phase 3 (Decompression)
The separator 4 is decompressed by exhausting gas at a constant mass flow through the decompression valve 24, either to a dedicated gas transportation line or to the same transportation line 9 as is used for gas separated off in Phase 1, For a separator in the low pressure separator cycle to decompress gas to the gas export line, its oil inlet valve 18, gas inlet valve 27 and oil outlet valve 15 are closed, while its
REFERENCES:
patent: 4561866 (1985-12-01), Altmann et al.
patent: 4778443 (1988-10-01), Sands et al.
Aker Engineering a.s.
Hart Charles
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