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Compressor

a compressor and compression tube technology, applied in the field of compressors, can solve the problems of insufficient natural gas flow, large quantity of natural gas remaining inside the gas field, and extreme harsh operating environment, and achieve the effect of reducing the operating range during operation, preventing liquid adhesion, and reducing the efficiency of the impeller

Inactive Publication Date: 2019-03-21
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a compressor that can prevent liquids from getting stuck to its blades without affecting its efficiency. This means the compressor can work over a wider range of conditions and can still achieve its maximum performance.

Problems solved by technology

When the pressure drops to a limit pressure or lower, however, a sufficient natural flow of the gas cannot be achieved.
Nevertheless, a considerable quantity of natural gas remains inside a gas field even after a drop of underground pressure to a level insufficient for natural flow of the gas.
The downhole compressor described above is placed at the bottom of the gas field or immediately below the gas field, and therefore operates in an extremely harsh operating environment.
Liquid having entered the inside of the compressor in this environment is considered to reduce efficiency as a result of collision with an impeller, reduce an operating range or generate instable fluid force as a result of closure of a channel caused by fouling, and reduce the thickness of the impeller as a result of erosion.

Method used

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Experimental program
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Effect test

first embodiment

[0017]A compressor 1 according to the present invention is hereinafter described with reference to the drawings. The compressor 1 according to the present embodiment, which is called downhole compressor, is a turbo compressor used within a gas well of a gas field which produces natural gas, for example. Not only natural gas, but also water and liquid containing light liquid hydrocarbon called condensate are mixed into working fluid.

[0018]FIG. 1 is a cross-sectional view illustrating only a left half of a main part of the compressor 1 according to the first embodiment.

[0019]As illustrated in FIG. 1, the compressor 1 includes a casing 16, a motor 2, a rotation shaft 11, an impeller 10 and first guide vanes 15.

[0020]The casing 16 has a cylindrical shape with a coaxial penetration space 16a, and includes a motor housing portion 16B an intermediate portion 16C, and a discharge portion 16D. The motor housing portion 16B houses the motor 2, and includes an inner circumferential face 16e. T...

second embodiment

[0035]FIG. 4 is a cross-sectional view illustrating only a left half of a main part of the compressor 21 according to the

[0036]As illustrated in FIG. 4, the intermediate portion 16C of the compressor 21 according to the present embodiment includes a second liquid storage hole 17 and a second drain port 18. The second liquid storage hole 17 is opened to the penetration space 16a at a position on the downstream side with respect to the position of the first liquid storage hole 13 in the flow of working fluid. The second liquid storage hole 17 is configured to store liquid. The second drain port 18 connects the second liquid storage hole 17 and the outside of the casing 16 such that the second liquid storage hole 17 and the outside can communicate with each other. Liquid having entered the second liquid storage hole 17 passes through the second drain port 18, and goes out of the casing 16 for discharge. The second liquid storage hole 17 and the second drain port 18 correspond to a seco...

third embodiment

[0041]FIG. 5 is a cross-sectional view illustrating only a left half of a main part of the compressor 31 according to the

[0042]As illustrated in FIG. 5, a plurality of second guide vanes 19 are provided on the casing 16 of the compressor 31 according to the present embodiment. The respective second guide vanes 19 project from the inlet face 16f toward the rotation shaft 11 substantially at equal intervals in the circumferential direction. In addition, each of the second guide vanes 19 has a plate shape, and is disposed in parallel with the upstream-downstream direction.

[0043]According to the compressor 31 of the present embodiment configured as above, the respective second guide vanes 19 can reduce a swirl component of working fluid given from the first guide vanes 15. Accordingly, this configuration can smoothly change a flow of working fluid in the vertical direction to a flow in the horizontal direction in the impeller 10, thereby suppressing an efficiency drop of the impeller 10...

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PUM

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Abstract

Provided is a compressor operable with suppressing moisture adhesion to an impeller. This compressor includes; a tubular casing forming an annular space; a motor within the casing's annular space with having a gap between the casing and the motor; a rotary shaft extending downstream from the motor, for outputting rotational driving force of the motor; an impeller affixed to the rotary shaft downstream from the motor, and that compresses an operating fluid; and first guide blades in the gap and configured so as to impart a swirl component to operating fluid passing through the gap and moving toward the impeller due to the rotation of the impeller. A first moisture accommodation hole and a first discharge port, which open toward the portion of the annular space located between the impeller and the first guide blades and are for discharging moisture in the operating fluid, are formed in the casing.

Description

TECHNICAL FIELD[0001]The present invention relates to a compressor, and particularly to a compressor used in a gas field which produces natural gas.BACKGROUND ART[0002]In recent years, gas fields to be developed have been shifting from conventional type gas fields to non-conventional type gas fields with increasing demands for fossil fuels and advancement of mining technologies. This shift of gas field development produces the necessity of placing a compressor in a harsh environment such as an environment immediately below a gas field. To cope with the environment immediately below a gas field, there has been proposed a method which places a compressor inside a gas well several thousands of meters underground, compresses gas at the bottom of the well by using the compressor, and supplies the compressed gas to the ground. Research and development of a compressor suitable for this method (a downhole-type compressor) have been in progress.[0003]A gas field has a high underground pressu...

Claims

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Application Information

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IPC IPC(8): F04D29/42F04D17/10E21B43/38
CPCF04D29/4206F04D17/10E21B43/38F04D19/00F04D29/522F04D29/706
Inventor KAWAGUCHI, DAISUKE
Owner HITACHI LTD