US4823889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Downhole screw motor
Assignee: VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY INSTITUT BUROVOI TEKHNIKI
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Filing: 1985-12-30
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Granted: 1989-04-25
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Expires: 2005-12-30
Abstract
Abstract A downhole screw motor is designed for drilling oil and gas wells. A downhole screw motor has a stator (3) and a hollow rotor (4) having an axial passage (5) in which is mounted a flow regulator (6) having a nozzle (16). The surface of the nozzle (16) washed with working liquid is made up of two chambers disposed in series in the flow direction: an admission chamber (A) and a delivery chamber (B), the surfaces (19, 20) of the chambers being conjugated along a breaking line (21). A portion (22) of the admission chamber (A), which is adjacent to the breaking line (21), is convex with respect to the direction of flow of working liquid, and the cross-sectional area of the admission chamber (A) at the outlet thereof is smaller thereof is smaller than the cross-sectional area of the same chamber at the inlet thereof.
Inventors
- 👤 Dmitry F. Baldenko
- 👤 Leonid A. Kondratenko
- 👤 Valery I. Semenets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:12
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/06; E; E21; E21B; E21B4/00; E21B4/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
A downhole screw motor comprising a spindle section (2) and a motor section (1) having working members in the form of a stator (3) and a hollow rotor (4) having an axial passage (5) communicating with a high-pressure zone of working liquid, a regulator (6) of working liquid flow having a nozzle (16) being mounted in the axial passage, characterized in that the nozzle (16) has two chambers disposed in series in the direction of working liquid flow an admission chamber (A) and a delivery chamber (B) having their surfaces (19, 20) washed with liquid which are conjugated along a breaking line (21), an annular portion (22) of the admission chamber (A), which is adjacent to the breaking line (21), being convex with respect to the direction of working liquid flow, and the cross-sectional area of the admission chamber (A) at the outlet thereof being smaller than the cross-sectional area of the same chamber at the inlet thereof.
Claim 2
Dependent Claim
158 words
A downhole screw motor comprising a spindle section (2) and a motor section (1) having working members in the form of a stator (3) and a hollow rotor (4) having an axial passage (5) communicating with a high-pressure zone of working liquid, a regulator (6) of working liquid flow having a nozzle (16) being mounted in the axial passage, characterized in that the nozzle (16) has two chambers disposed in series in the direction of working liquid flow an admission chamber (A) and a delivery chamber (B) having their surfaces (19, 20) washed with liquid which are conjugated along a breaking line (21), an annular portion (22) of the admission chamber (A), which is adjacent to the breaking line (21), being convex with respect to the direction of working liquid flow, and the cross-sectional area of the admission chamber (A) at the outlet thereof being smaller than the cross-sectional area of the same chamber at the inlet thereof.
Claim 3
Dependent Claim
53 words
A downhole screw motor according to claim 1, characterized in that the nozzle (16) is made-up of two members: a bushing (23) and a rod (24) mounted inside the bushing, the admission (A) and delivery (B) chambers being defined by surfaces of the bushing (23) and rod (24) and being annular in shape.
Claim 4
Dependent Claim
42 words
A downhole screw motor according to claim 2, characterized in that the rod (24) is cylindrical and the bushing (23) is internally provided with an annular projection (23) defining the convex portion (22) of the surface (19) of the admission chamber (A).
Claim 5
Dependent Claim
35 words
A downhole screw motor according to claim 2, characterized in that the bushing (23) is cylindrical and the rod (24) has an annular projection (27) defining the convex portion (22) of the admission chamber (A).
Claim 6
Dependent Claim
38 words
A downhole screw motor according to claim 2, characterized in that the bushing (23) and rod (24) have annular projections (28, 29), each projection defining the convex portion (22) of the surface (19) of the admission chamber (A).
References Cited (Backward Citations)
SU237596A1
Cited
FR1224842A
Cited
FR1271127A
Cited
US3456746A
Cited
DE1953477A1
Cited
SU436595A2
Cited
US4019591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |