Rotary kinetic fluid motors or pumps – With diversely oriented inlet or additional inlet for...
Patent
1995-05-03
1996-12-10
Larson, James
Rotary kinetic fluid motors or pumps
With diversely oriented inlet or additional inlet for...
415147, 166321, F21B 3410, F04D 1500
Patent
active
055825052
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a bore-hole pump for pumping a viscous fluid, e.g. petroleum, from underground deposits. The bore-hole pump is lowered into a bore-hole until it is immersed in the fluid or into a fluid-carrying ground stratum. It thus fills with fluid. To facilitate pumping a viscous fluid, a low-viscosity solvent is added to the fluid in order to reduce its viscosity.
PRIOR ART
Such bore-hole pumps exist in a large number of designs. Pumps are used which are driven through linkages or driven directly by an electric motor, also turbo-pumps, that is pumps driven by turbines. One example of a turbo-pump is described in the EP-A-0 246 943, in which the driving liquid of the turbine is admixed to the pumped medium to reduce its viscosity.
However, all the above known bore-hole pumps have in common the disadvantage that, as they are lowered, fluid penetrates into the inlet of the bore-hole pump, and the pump part fills up. If the bore-hole pump is started when it is completely filled just with the highly viscous fluid, the starting torque is many times greater than the rated torque of a bore-hole pump for pumping a mixture of fluid and solvent. This must be taken into account in the design of the drive and of the torque-transmitting parts, to avoid difficulties in starting up the bore-hole pump. As a consequence, the drive is over-sized relative to normal operation, and larger dimensions and/or the use of higher-grade materials are needed to deal with the higher torques.
The invention is based on the task of remedying this disadvantage.
PRESENTATION OF THE INVENTION
This task is achieved in that a shutoff device is disposed between the inlet of the bore-hole pump and the actual inlet of the pump part. This has the advantage that, as the pump is lowered into the bore-hole, the pump part is closed, so that no viscous fluid can penetrate into the moving parts of the pump part.
The further development of claim 2 teaches the hydraulic activation of the shut-off device by the solvent. This type of activation has the advantage that the space required by the activation device can be kept small.
The shut-off device can be designed in the form of a hydraulically activated valve. A valve which has a rotationally symmetric through-flow cross-section is especially preferred.
In contrast to most conventional valves, in which the shut-off element moves in the flow direction while the valve opens, and moves counter to the flow direction while the valve closes, the further development of claim 4 is advantageous, according to which the valve is closed in the flow direction. The hydrostatic pressure in the bore-hole here reinforces the sealing action of the shut-off element, which is pressed into its seat. However, an essential advantage is that, with this design, the valve closes automatically when there is a sudden pressure drop in the solvent, e.g. because of break down of the pump at the surface. In the case of an accident, no undiluted, viscous petroleum can enter the pump part, which would make restart of the bore-hole pump difficult.
According to the further development of claim 5, the unloaded valve is closed by a reset means. This can be a spring. When the hydraulic piston is in its unloaded state, e.g. during entry of the bore-hole pump, the reset means assures reliable closure of the valve.
The further development of claim 6 has the advantage that the sealing action of the shut-off device is increased.
A turbo-pump as a bore-hole pump, as indicated in claim 7, has the advantage that the driving liquid of the turbine at the same time can be used as the solvent. The driving liquid is conducted to the turbine at high pressure, the pressure of the driving liquid being generated by a pump at the surface. It is possible to tap the pressure for activating the shut-off device at various points. Thus, the pressure prevailing at the entry of the turbine, as also the residual pressure present at the exit of the turbine, can be used. Furthermore, with a multi-stage turbine, it is possible to choose
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Larson James
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