EP 0264444 A4 19890412 - DOWNHOLE SCREW MOTOR.
Title (en)
DOWNHOLE SCREW MOTOR.
Title (de)
SCHRAUBEN-BOHRLOCHSOHLENMOTOR.
Title (fr)
MOTEUR DE FOND DU TYPE A VIS.
Publication
Application
Priority
SU 8500107 W 19851230
Abstract (en)
[origin: EP0264444A1] A downhole screw motor is intended for drilling oil and gas wells. The downhole screw motor comprises a stator (3) and a hollow rotor (4) in the axial channel (5) of which is mounted a flow regulator (6) with a nozzle (16). The surface of the nozzle (16), arround which the working liquid flows, is formed by two consecutively located chambers: a receiving one (A) and a discharging one (B), the surfaces (19, 20) of which are conjugated along a break line (21). The part (22) of the receiving chamber (A) which adjoins the break line (21) has a convex form in the direction of flow of the working liquid, whereas the cross-sectional area of the receiving chamber (A) at its outlet is smaller than at its inlet.
IPC 1-7
IPC 8 full level
E21B 4/02 (2006.01); F04C 14/24 (2006.01); F04C 15/06 (2006.01)
CPC (source: EP)
E21B 4/02 (2013.01); F04C 14/24 (2013.01); F04C 15/06 (2013.01)
Citation (search report)
- [A] US 4397619 A 19830809 - ALLIQUANDER OEDOEN [HU], et al
- See references of WO 8704215A1
Designated contracting state (EPC)
AT CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0264444 A1 19880427; EP 0264444 A4 19890412; EP 0264444 B1 19910724; AT E65583 T1 19910815; BR 8507322 A 19880209; DE 3583618 D1 19910829; DK 422487 A 19870813; DK 422487 D0 19870813; JP H0412800 B2 19920305; JP S63501965 A 19880804; NO 168436 B 19911111; NO 168436 C 19920219; NO 873582 D0 19870825; NO 873582 L 19870825; WO 8704215 A1 19870716
DOCDB simple family (application)
EP 86901283 A 19851230; AT 86901283 T 19851230; BR 8507322 A 19851230; DE 3583618 T 19851230; DK 422487 A 19870813; JP 50153486 A 19851230; NO 873582 A 19870825; SU 8500107 W 19851230