GB2071766A - Pump Systems for Installation in Wells - Google Patents
Pump Systems for Installation in Wells Download PDFInfo
- Publication number
- GB2071766A GB2071766A GB8100777A GB8100777A GB2071766A GB 2071766 A GB2071766 A GB 2071766A GB 8100777 A GB8100777 A GB 8100777A GB 8100777 A GB8100777 A GB 8100777A GB 2071766 A GB2071766 A GB 2071766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- pumps
- well
- electric
- tubing
- 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.)
- Granted
Links
- 238000009434 installation Methods 0.000 title claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/128—Adaptation of pump systems with down-hole electric drives
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An electric pump assembly (90) for installation in a well to lift oil comprises a plurality of pumps (91, 92) located at axially spaced apart positions in the well each supplied with power from a cable (94). The pumps can be located within, and supported by, a tubing (93) of larger diameter than the pumps, the annulus between pumps (91, 92) and tubing (93) being blocked, conveniently by a compressible sealing means or pack off (109) disposed between the suction and discharge of the pumps. <IMAGE>
Description
SPECIFICATION
Apparatus for Installation in Wells
This invention relates to an apparatus for lifting fluids such as oil or water in wells by means of electric pumps and a method employing same.
When oil is produced from a well it is usual for the oil initially to flow up the well to the surface as a result of the pressure existing in the oil bearing formation underground. However, during the producing life of the oil field the pressure underground falls and often a point is reached when the pressure is not sufficient to cause the oil to flow to the surface. One way of maintaining the flow of oil has been to install an electric pump in the well, usually at à depth which is near the oil bearing formation typically from 1,000 to 10,000 feet, and employing the pump to lift the oil to the surface. The pump can be of high power, for example, several hundred horsepower and may be up to 1 50 feet in length whilst only 8 inches in diameter. A pump with these dimensions can be difficult to install, particularly in a deviated well.
It is an object of the present invention to provide an electric pump assembly that reduces the above mentioned difficulty.
According to the present invention an electric pump assembly suitable for installation in a well for lifting a fluid such as oil or water comprises:
an elongate electrical conducting means having a plurality of electric pumps located at axially spaced apart positions along the length thereof each pump having at least one closed'end said assembly being suitable for installation in a well so that the electric pumps are located at axially spaced apart positions in the well.
In our copending European Patent Application
No. 80302392.8 there is described an electric pump suitable for location in a well to lift fluids in the well, the pump having a central aperture extending axially therethrough and being of sufficient size to permit wire line operations to be conducted in the well below the pump. The specification further discloses a pump assembly which comprises a plurality of said pumps maintained at axially spaced apart positions by connecting means such as tubing.
The pumps empioyed in the assembly according to the present invention have at least one closed end and thus do not have an aperture extending axially therethrough.
The pump which, when installed is the lowermost pump, may have connected thereto a means for locking the apparatus down into a well packer.
The electric pumps can be of conventional design incorporating an electric motor comprising a stator and rotor, the latter being connected to an impeller assembly.
The pumps can conveniently be supporting by a tubing.
The electrical conducting means can be a cable and the cable can conveniently be connected to the stator, the rotor being disposed around the stator and having a tubular portion through which the cable extends, the impellers being attached to the exterior thereof.
The invention is illustrated by reference to the accompanying drawings in which:
Figure 1 is a schematic view of the apparatus according to the invention installed in an oil well in which the electric pumps are run on tubing and the electric cable supplying power to the pumps is strapped to the tubing.
Figure 2 is a vertical section showing one arrangement of motor/pump unit, and
Figure 3 is an alternative arrangement.
Figure 4 is a schematic view of the apparatus according to the invention installed in an oil well the apparatus being generally similar to that of
Figure 1 but shown in more detail.
Figure 5 is a vertical section of a motor/pump unit, and
Figure 6 is a vertical section of a safety valve arrangement suitable for installation in the well at a position above the uppermost electric pump.
Figure 7 is a vertical section showing a part of the electric pump assembly of Figure 1 enlarged and in more detail.
Referring to the drawings, in Figure 1 the apparatus indicated generally by numeral 2 is shown located in a well lined with casing 4 and comprises electric pumps 6, 8, 10 and 12 located at axially spaced apart positions in the well and supported by tubing 1 6 and supplied with electric power by cable 18, the latter being strapped to the tubing 1 6. The annular space 20 between the tubing 1 6 and casing 4 is blocked off by packer 22 in the region of the lowermost pump 12 and may contain an inhibited fluid if necessary. Above the uppermost pump 6 is a safety valve 24. Flow of oil through the system is as indicated by the arrows.In Figure 2 a pump indicated generally by numeral 30 comprises a tubular housing 32 internally threaded at its upper end to provide a box 34 and externally threaded at its lower end to provide a pin 36. Motor 38 is located in tubing 40 and supplied with power by cable 42. The impeller assembly of the pump is located within housing 32. Figure 3 shows an alternative arrangement in which housing 32 is externally threaded at its upper end to provide pin 44. In
Figure 4 pumps 6, 7, 9 and 12 are provided with rubber sealing cups 46 which engage casing 4.
The well head 46 is conventional and includes connector 48 and hanger 50 and valve controlled ports 52 for oil discharge. The tubing 1 6 is made up of lengths joined endwise by connectors 54.
The pumps can be arranged so that the motors of adjacent pumps rotate in opposite directions and means can be provided for commencing the operation of the pumps one by one at short time intervals which may be, for example, milliseconds.
In Figure 5 the motor indicated generally by numeral 60 comprises a stator 62 (connected to an electric cable (not shown) within tubing 1 6) and a rotor 64 disposed around the stator 62 and having a tubular portion 66 to which are attached impellers 68. Interposed between tubing 16 and the upper and lower ends of rotor 64 are bearings 70 and 72 respectively. Co-operating with impellers 68 are biades 74 attached to a tubular support 76 which is mounted on casing 4 by struTs 78 and maintained central with respect to casing 4 by means C centraliser 80. Internally strew threaded sleeve connectors 82 and 84 connect the individual lengths of tubing 1 6 together. Flow of ci! is as indicated by the arrows.
In Figure 6 a sub -surface safety valve 24 for a cable suspended pump assembly and operated via control tine 25 is mount above a retrievable packer So having an aperture therethrough for cabie 1 8 to pass. The safety valve 24 is set in or run as part of a tubing hung from the tubing hanger 50 in the well head and at its lower end is connected to a retrievabie dual packer 86 with the cable sealed through one aperture and the tubing in the other. The cable 1 8 is centralised below the packer 86 with the ioad of pump and cable below the packer taken on same. Access holes in the support between packer and cable are provided for fluid to pass. Flow of oil is as indicated by the arrows.
Referring to Figure 7 a pump assembly indicated generally by numeral 90 comprises two pumps 91 and 92 each being supported by a pack off isolation 1 09 between suction and discharge.
Alternatively the diameter of the upper part of the housing 104 can be larger than that shown and can be screwed to a production tubing 93. To achieve this the outer diameter of the pump housing may be the same as the tubing 93.
Electric power is supplied to the motor of each pump by cable 94 located in the annulus 95 between the tubing 93 and well casing 96. The two pumps are of the same construction: pump 91, for example, comprising an electric motor 100 located below an impeller assembly 102 and enclosed within a common housing 104. The latter has a waisted portion 105 in which are provided apertures 106 for the entry of oil. At the upper end of the housing 104 is a discharge port 108. The lower end 110 of the housing 104 is closed. The dotted lines and arrows indicate the direction of oil flow.
The advantages of the above described assembly are: (1) the assembly is easier to instal than is a single pump unit of equivalent power,
(2) the setting depth does not have to be below a packer required to isolate the tubing from the tubing!casing annulus. Thus the packer does not have to be pulled with the pump assembly as is necessary at present. In addition the setting depth is only that required to provide a net positive suction head to the pump. ~~~~~~~~~~~~~~~~
Claims (9)
1. An electric pump assembly suitable for installation in a well for lifting a fluid such as oil or water comprising:
an elongate electrical conducting means having a plurality of electric pumps located at axially spaced apart positions along the length thereof each pump having at least one closed end, said assembly being suitable for installation in a well so that the electric pumps are located at axially spaced apart positions in the well.
2. An electric pump assembly as claimed in claim 1 wherein the pumps are located in a tubing in the well and the annulus between each pump and the tubing is blocked by engagement of compressible sealing means with the pump and tubing.
3. An electric pump assembly as claimed in claim 1 wherein the pumps are supported in the well at least partly by a tubing.
4. An electric pump assembly as claimed in claim 3 wherein the rotor of one or more of the electric pumps is disposed around its stator and has a tubular portion through which the electrical conducting means extends, the exterior of the tubular portion having impellers attached thereto.
5. An electric pump assembly as claimed in any one of the preceding claims wherein each pump is arranged with respect to the electrical connecting means so that its motor is located below its impellers, and the motor is enclosed within a housing the lower end of which is closed.
6. An electric pump assembly as claimed in claim 5 wherein each pump is supported by a connecting means which connects the pump to the tubing within which the pump is located and blocks the annulus between the pump and tubing between the suction and discharge parts of the pump.
7. An electric pump assembly suitable for installation in a well for lifting a fluid such as oil or water substantially as hereinbefore described with reference to any one of Figures 1 to 7 of the accompanying drawings.
8. A method of lifting a fluid such as oil or water in a well which method comprises installing in the well a plurality of electric pumps at axially spaced apart positions, each of the pumps being closed at at least one end, the power of the pumps and their spacing being such that the fluid can be lifted from the lowermost to the uppermost pump, and operating the electric pumps to lift the fluid in the well.
9. An electric pump assembly substantially as hereinbefore described with reference to Figures 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8100777A GB2071766B (en) | 1980-01-12 | 1981-01-12 | Pump systems for installation in wells |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8001066 | 1980-01-12 | ||
| GB8100777A GB2071766B (en) | 1980-01-12 | 1981-01-12 | Pump systems for installation in wells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2071766A true GB2071766A (en) | 1981-09-23 |
| GB2071766B GB2071766B (en) | 1984-06-06 |
Family
ID=26274122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8100777A Expired GB2071766B (en) | 1980-01-12 | 1981-01-12 | Pump systems for installation in wells |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2071766B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438515A (en) * | 2006-05-23 | 2007-11-28 | Baker Hughes Inc | Capsule for downhole pump modules |
| US7481270B2 (en) * | 2004-11-09 | 2009-01-27 | Schlumberger Technology Corporation | Subsea pumping system |
| WO2019083352A1 (en) * | 2017-10-25 | 2019-05-02 | Petroliam Nasional Berhad (Petronas) | Method and system for installing an electrical submersible pump |
-
1981
- 1981-01-12 GB GB8100777A patent/GB2071766B/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7481270B2 (en) * | 2004-11-09 | 2009-01-27 | Schlumberger Technology Corporation | Subsea pumping system |
| AU2005229738B2 (en) * | 2004-11-09 | 2009-05-14 | Schlumberger Technology B.V. | Subsea pumping system |
| US7669652B2 (en) | 2004-11-09 | 2010-03-02 | Schlumberger Technology Corporation | Subsea pumping system |
| GB2438515A (en) * | 2006-05-23 | 2007-11-28 | Baker Hughes Inc | Capsule for downhole pump modules |
| GB2438515B (en) * | 2006-05-23 | 2009-08-05 | Baker Hughes Inc | Capsule for two downhole pump modules |
| US7736133B2 (en) | 2006-05-23 | 2010-06-15 | Baker Hughes Incorporated | Capsule for two downhole pump modules |
| CN101086250B (en) * | 2006-05-23 | 2011-12-28 | 贝克休斯公司 | Capsule for downhole pump modules |
| WO2019083352A1 (en) * | 2017-10-25 | 2019-05-02 | Petroliam Nasional Berhad (Petronas) | Method and system for installing an electrical submersible pump |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2071766B (en) | 1984-06-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970112 |