Patent US4655177A successfully refreshed from Google Patents.
Patent US4413958A successfully refreshed from Google Patents.
US4413958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for installation in wells
Assignee: BP PLC
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Filing: 1980-07-16
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Granted: 1983-11-08
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Expires: 2000-07-16
Abstract
Abstract An electric pump assembly (1) for lifting fluids in wells comprises a plurality of electric pumps (20) and (24) located at axially spaced apart locations in the well each pump having an axial aperture (21) to permit wire line operations to be conducted in the well below the assembly (1). Adjacent pumps (20) and (24) can rotate in opposite directions about a common axis to effect torque balancing. Each pump (20) can have a transformer (50) to permit local adjustment of voltage and means (40) are provided for sequential operation of the pumps. Assembly can be supported on cable (12), (14) or on production tubing (60) assisted by packers.
Inventors
- 👤 Alan D. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:19
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/10; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/128; F04D13/0646; Y; Y10; Y10S; Y10S415/00; Y10S415/901
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
An electric pump suitable for location in a well to lift fluids in the well, the pump having an electric motor comprising a rotor and a stator, the stator being fixed and internal with respect to the rotor and having a central aperture extending axially therethrough of a dimension sufficient to permit wire line operations to be conducted through the aperture in the well below the pump, the rotor having a plurality of fluid impellers attached thereto, the pump further comprising a non-return valve located in said aperture and biased in the open position when the pump is inoperative but closable by the wash of well fluids when the pump is working.
Claim 2
Dependent Claim
112 words
An electric pump suitable for location in a well to lift fluids in the well, the pump having an electric motor comprising a rotor and a stator, the stator being fixed and internal with respect to the rotor and having a central aperture extending axially therethrough of a dimension sufficient to permit wire line operations to be conducted through the aperture in the well below the pump, the rotor having a plurality of fluid impellers attached thereto, the pump further comprising a non-return valve located in said aperture and biased in the open position when the pump is inoperative but closable by the wash of well fluids when the pump is working.
Claim 3
Dependent Claim
55 words
An electric pump assembly suitable for installation in an oil well to lift oil in the well comprising a plurality of electric pumps as claimed in claim 1 the pumps being maintained at axially spaced apart positions by connecting means to permit wire line operations to be conducted in the well below the pump assembly.
Claim 4
Dependent Claim
31 words
An electric pump assembly as claimed in claim 2 wherein adjacent pumps or pairs of pumps are arranged to rotate in opposite directions about a common axis to improve torque balancing.
Claim 5
Dependent Claim
29 words
An electric pump assembly as claimed in claim 2 wherein each pump is provided with a transformer to permit local adjustment of voltage to accommodate supply cable voltage drop.
Claim 6
Dependent Claim
28 words
An electric pump assembly as claimed in claim 2 wherein means are provided for controlling the operation of the pumps individually to permit operation of the pumps sequentially.
Claim 7
Dependent Claim
17 words
An electric pump assembly as claimed in claim 2 wherein the pump assembly is suspended on cable.
Claim 8
Dependent Claim
26 words
An electric pump assembly as claimed in claim 6 wherein the cable suspension comprises three cables symmetrically disposed with respect to the axis of the well.
Claim 9
Dependent Claim
30 words
An electric pump assembly as claimed in claim 2 wherein packers are provided to engage the sides of the well to assist in supporting the pump assembly in the well.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |