Pumps – One fluid pumped by contact or entrainment with another – Jet
Reexamination Certificate
1999-12-21
2001-04-03
Freay, Charles G. (Department: 3746)
Pumps
One fluid pumped by contact or entrainment with another
Jet
C417S198000
Reexamination Certificate
active
06210123
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a jet pumping device whose efficiency is improved in relation to known jet pumps.
The continuous jet pump works according to the principle of injection of a working fluid through a calibrated restriction (nozzle) leading to a high-velocity jet along the axis of a mixing neck. The jet carries along and mixes with the fluid to be pumped according to the momentum exchange principle. The velocity at the mixer outlet is converted to pressure in a divergent channel that follows the mixing neck.
The present invention improves pumping efficiencies by acting on the circulation of the pumped fluid and/or of the working fluid.
This type of pump can be used notably in petroleum effluent production, whether in surface installations or in bottomhole installations.
The advantages afforded by improved-efficiency jet pumps can be:
no or very few parts in motion,
all fluid types can be pumped (liquids, gases, viscous liquids or liquids containing solids) from a liquid working fluid (water, oil, . . . ),
their size is relatively compact and compatible with the dimensions of an oil well or of a delivery pipe.
SUMMARY OF THE INVENTION
The present invention thus relates to a fluid jet pumping device comprising an injection nozzle intended for injection of a working fluid, placed in a line comprising, from upstream to downstream, a substantially cylindrical barrel, a convergent neck, a mixing channel and a diffuser, said nozzle is placed at the end of a nozzle holder on the longitudinal axis of said line, the pumped fluid circulates in the annular space contained between the barrel and the outside of the nozzle and of the nozzle holder, the orifice of the nozzle has the longitudinal axis as the axis of symmetry. According to the invention, the device consists of one of the following combinations:
a) the nozzle holder comprises, in its inner channel, means for rotating the working fluid stream in the nozzle and means for rotating the nozzle around the longitudinal axis, said rotation means being independent of the energy of the working fluid or of the pumped fluid, the nozzle rotating in the opposite direction to the direction of rotation of the working fluid stream;
b) the nozzle holder comprises, on the outside, means for rotating the pumped fluid stream, such as blades inclined in relation to the longitudinal axis;
c) the nozzle holder comprises, on the outside, means for rotating the pumped fluid stream, such as blades inclined in relation to the longitudinal axis and, in its inner channel, means for rotating the working fluid stream in the nozzle.
In a first variant concerning combinations b) and c), the nozzle of the device can be static.
In a second variant concerning combinations b) and c), the nozzle can comprise external rotation means independent of the energy of the working fluid or of the pumped fluid.
In the previous variant, the nozzle can rotate in the opposite direction to the direction of rotation of the working fluid stream.
In the device according to the invention, the means for rotating the pumped fluid stream can consist of a series of blades evenly distributed on the outside of the nozzle holder and inclined in relation to the longitudinal axis at an angle ranging between 10 and 50 degrees.
The direction of rotation of the pumped fluid stream can be identical to the direction of rotation of the assembly consisting of the nozzle and of the nozzle holder.
The means for rotating the working fluid stream can consist of a flat strip whose width is substantially equal to the inside diameter of the nozzle holder channel, said strip being helical in said channel so as to form two helical channels. The helix pitch is possibly variable, in particular decreasing in the vicinity of the nozzle.
The means for rotating the working fluid stream can consist of a stationary turbine in the nozzle channel.
The invention relates to an application of the device for pumping an effluent from the bottom of a well to the ground surface. The invention can also be used for surface pumping of a petroleum effluent.
REFERENCES:
patent: 92313 (1869-07-01), Hughes
patent: 541781 (1895-06-01), Wheeler
patent: 1739600 (1929-12-01), Loth
patent: 2306727 (1942-12-01), Hill
patent: 3134338 (1964-05-01), Dodge
patent: 5082426 (1992-01-01), Sasaki et al.
patent: 136245 (1901-07-01), None
patent: 906743 (1949-07-01), None
patent: 1082970 (1955-01-01), None
patent: 2097675 (1972-03-01), None
Antonelli Terry Stout & Kraus LLP
Freay Charles G.
Institut Francais du Pe'trole
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