US20050163633A1 - Pump for pumping oil from deep wells - Google Patents
Pump for pumping oil from deep wells Download PDFInfo
- Publication number
- US20050163633A1 US20050163633A1 US10/766,585 US76658504A US2005163633A1 US 20050163633 A1 US20050163633 A1 US 20050163633A1 US 76658504 A US76658504 A US 76658504A US 2005163633 A1 US2005163633 A1 US 2005163633A1
- Authority
- US
- United States
- Prior art keywords
- pump
- screw
- shaped rotors
- pressure space
- wear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
Abstract
Pump for pumping liquids, especially oil, from deep wells comprising a screw pump which is driven by a submersible motor and welding a driving spindle to which several, preferably three screw-shaped rotors, are assigned, and further being constructed as a sealing spindle, hydraulic support bearings for intercepting the axial thrust, and inlet openings which are protected against wear particles by a screen disposed on the screw-shaped rotors on the suction side and connected over bypass pipelines with the pressure side.
Description
- The invention relates to a pound for pumping liquids, especially oil from deep wells with a screw pump driven by a submersible motor.
- Generally, oil is pumped from on-shore exploration from drilled boreholes with a clear width of 4.5″, 5.5″ and 7″. The pump operating head may to amount up to 1000 m. This, in turn, requires pumps, which, on the one hand can be supplied in constructions that can be incorporated in these narrow boreholes and, on the other, are able to produce the respective pump-operating heads. Up until now, eccentric screw pumps and multistep high-pressure rotary pumps were used for this purpose. Both have service life and efficiency disadvantages. Eccentric screw pumps can hardly supply satisfactory service life intervals over expensive stators. In the case of high-pressure rotary pumps, the installed width for appropriate efficiencies by means of blade wheels constructed with an optimum diameter cannot be achieved. In both systems, the high operating temperatures of 150° to 290° C., existing at the respective drilled depths, are a further difficulty.
- The use of a classical screw pump of the usual type fails, on the one hand, because the pumping output is too low, and on the other, because of the problem of the destruction of the pumps by wear particles, such as sand or the like, present in oil that is to be pumped.
- This is also the case for a pump, described in U.S. Pat. No. 4,623,305, since the horseshoe thrust bearing and the balance piston for the idler screw would inevitably be destroyed by any contaminated oil (sand).
- Correspondingly, the same is also true for U.S. Pat. No. 2,100,560 using a screw spindle diving mechanism as driving motor. Furthermore, in the case the previously known pumps, there is the fact that the power density, that is, the pumping output in relation to the volume, is limited owing to the fact that only the central spindle acts as a screw-shaped rotor, whereas the satellite spindles are only sealing spindles.
- It is therefore an object of the invention to design a pump of the above-mentioned type, so that, during appropriate operating times, possibly contaminated oil can be pumped at high operating temperatures from great drilling depth and at the same time, an increased power density can be achieved.
- Pursuant to the invention, this objective is accomplished by a pump, which is provided with a screw pump driven by a submersible motor, the driving spindle being constructed as a sealing spindle, to which several, preferably three screw-shaped rotors are assigned and, for intercepting the axial thrust, hydraulic supporting bearings are disposed on the conveying elements, on the suction side and are connected over bypass pipelines with the pressure side, the inlet openings of which are safeguarded against wear particles by a screen.
- The inventive construction results, on the one hand, in a quite high pump performance, because three screw-shaped rotors and only one sealing spindle are provided and, not as previously, one screw-shaped rotor and, for example, three sealing spindles. On the other hand, there is also a constant flushing with purified oil, which passes over the bypass pipelines from the pressure side to the suction side into the hydraulic supporting bearings, as well as an additional flushing of the conveying gap, so that abrasive grinding materials, such as grains of sand or the like, which are transported along with the pumped oil, cannot interfere too much with the operation.
- In a further development of the invention, the screw-shaped rotors can discharge into an expanded pressure space, in the peripheral wall of which, covered with a filter, the inlet openings of the bypass pipelines are disposed. Preferably, the pressure space may have an essentially triangular cross section with rounded corners embracing the screw-shaped rotors.
- In this expanded pressure space, sufficient turbulence is developed to ensure that, when oil flows over the pressure return with the bypass pipelines from the pressure side to the suction side and the hydraulic supporting bearings, the wear particles, which remain hanging at the filter, are removed once again by this turbulent flow and carried along, so that the these wear particles are pumped upward with the oil.
- The expanded pressure space can be connected over axial boreholes with the connecting space to the conveying riser.
- In accordance with a further embodiment of the invention, the inner surface of the housing of the screw pump is to have a wear-resistant surface such as that, provided, for example, by a wear-resistant coating.
- Finally, it is also still within the scope of the invention, that the housing of the screw pump on the suction side has one lateral suction inlet opening per screw-shaped rotor.
- Further advantages, distinguishing features and details of the invention arise out of the following description of an example, as well as from the drawing, in which
-
FIG. 1 shows a longitudinal section through an inventive pump and -
FIG. 2 shows a cross section along the line II-II inFIG. 1 . - The inventive pump consists of a
screw pump 1 with a submersible motor, which is connected at the suction side. In the example shown, only the motor flange 2 is indicated. Thescrew pump housing 3 has adriving spindle 4, which is formed centrally as a sealing spindle and is surrounded by three screw-shaped rotors 5. Theinner surface 6 of the housing of thescrew pump 1 is provided with a surface, which protects against wear, such as a wear-resistant coating 7. - For intercepting the axial thrust on the pumping elements, that is, the screw-
shaped rotors 5,hydraulic support bearings 8 are provided, which are connected at overbypass pipelines 9 with the pressure side of thescrew pump 1. In the example shown, an expandedpressure space 10 is provided at this pressure side and formed by a corresponding bore of thehousing 3. The essentially triangular cross-sectional shape of this expanded pressure space with rounded corners, embracing the screw-shaped rotors 5, can be seen inFIG. 2 . The whole of the inner surface of this expanded pressure space can be covered with afilter 11, which covers theinlet openings 12 to thebypass pipelines 9, so that the return of the oil under pressure is protected and the oil, returned to the hydraulic supportingbearing 8, is cleaned. This prevents not only a clogging of the hydraulic supporting bearings themselves, but also, additionally, it bring about a flushing of the gap of the screw pump by this cleaned oil, so that the service life of the inventive pump is prolonged. - The expanded
pressure space 10 is connected overboreholes 13 with the connectingspace 14 to the conveyingriser 15. - Three suction inlet openings for aspirating the oil, which is usually mixed with impurities, can be seen at 16.
Claims (7)
1. Pump for pumping liquids, especially oil, from deep wells, comprising a screw pump driven by a submersible motor and including a driving spindle, to which several, preferably three screw-shaped rotors are assigned, and further being constructed as a sealing spindle hydraulic support bearings for intercepting the axial thrust, and inlet openings which are protected against wear particles by a screen disposed on the screw-shaped rotors on the suction side and connected over bypass pipelines with the pressure side.
2. The pump of claim 1 , wherein the screw-shaped rotors discharge into an expanded pressure space, in the peripheral wall of which, covered with a filter, the inlet openings of the bypass pipeline are disposed.
3. The pump of claim 2 , wherein the pressure space has an essentially triangular cross section with rounded-off corners which embrace the screw-shaped rotors.
4. The pump of claims 2 or 3, wherein the expanded pressure space is connected over axial boreholes with the connecting space to the conveying riser.
5. The pump of one of the claims 1 to 3 , wherein the surface of the housing of the screw pump has a wear-resistant surface.
6. The pump of claim 5 , wherein the inner surface of the screw pump has a wear-resistant coating.
7. The pump of one of the claims 1 to 3 , wherein the housing of the screw pump has a lateral suction inlet opening on the suction side for each screw-shaped rotor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/766,585 US20050163633A1 (en) | 2004-01-27 | 2004-01-27 | Pump for pumping oil from deep wells |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/766,585 US20050163633A1 (en) | 2004-01-27 | 2004-01-27 | Pump for pumping oil from deep wells |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050163633A1 true US20050163633A1 (en) | 2005-07-28 |
Family
ID=34795697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/766,585 Abandoned US20050163633A1 (en) | 2004-01-27 | 2004-01-27 | Pump for pumping oil from deep wells |
Country Status (1)
Country | Link |
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US (1) | US20050163633A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110052418A1 (en) * | 2009-09-02 | 2011-03-03 | William Bruce Morrow | System and method for a water cooling pump |
WO2016037299A1 (en) * | 2014-09-09 | 2016-03-17 | 赵锡寰 | Submersible oil well pump set having underground drive conversion device |
CN105570122A (en) * | 2016-02-22 | 2016-05-11 | 太仓液压元件有限公司 | High-rotation-speed screw pump |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2504230A (en) * | 1944-08-11 | 1950-04-18 | Frank E Smith | Rotary helical compressor or engine |
US2590560A (en) * | 1948-05-10 | 1952-03-25 | Montelius Carl Oscar Torsten | Screw pump |
US2652192A (en) * | 1947-06-13 | 1953-09-15 | Curtiss Wright Corp | Compound-lead screw compressor or fluid motor |
US5601414A (en) * | 1995-09-25 | 1997-02-11 | Imo Industries, Inc. | Interstage liquid/gas phase detector |
US6050797A (en) * | 1998-05-18 | 2000-04-18 | Carrier Corporation | Screw compressor with balanced thrust |
US6964560B2 (en) * | 2001-09-27 | 2005-11-15 | Taiko Kikai Industries Co., Ltd. | Vacuum pump |
US6986652B2 (en) * | 1999-11-17 | 2006-01-17 | Carrier Corporation | Screw machine |
-
2004
- 2004-01-27 US US10/766,585 patent/US20050163633A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2504230A (en) * | 1944-08-11 | 1950-04-18 | Frank E Smith | Rotary helical compressor or engine |
US2652192A (en) * | 1947-06-13 | 1953-09-15 | Curtiss Wright Corp | Compound-lead screw compressor or fluid motor |
US2590560A (en) * | 1948-05-10 | 1952-03-25 | Montelius Carl Oscar Torsten | Screw pump |
US5601414A (en) * | 1995-09-25 | 1997-02-11 | Imo Industries, Inc. | Interstage liquid/gas phase detector |
US6050797A (en) * | 1998-05-18 | 2000-04-18 | Carrier Corporation | Screw compressor with balanced thrust |
US6986652B2 (en) * | 1999-11-17 | 2006-01-17 | Carrier Corporation | Screw machine |
US6964560B2 (en) * | 2001-09-27 | 2005-11-15 | Taiko Kikai Industries Co., Ltd. | Vacuum pump |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110052418A1 (en) * | 2009-09-02 | 2011-03-03 | William Bruce Morrow | System and method for a water cooling pump |
WO2016037299A1 (en) * | 2014-09-09 | 2016-03-17 | 赵锡寰 | Submersible oil well pump set having underground drive conversion device |
CN105570122A (en) * | 2016-02-22 | 2016-05-11 | 太仓液压元件有限公司 | High-rotation-speed screw pump |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: LEISTRITZ AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:QUAST, ROLF;REEL/FRAME:015132/0910 Effective date: 20040315 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |