EP 0688938 A1 19951227 - Device for the control of rotary drawworks
Title (en)
Device for the control of rotary drawworks
Title (de)
Vorrichtung zur Steuerung eines Bohrhebewerks
Title (fr)
Dispositif de commande d'un treuil de forage
Publication
Application
Priority
FR 9407520 A 19940620
Abstract (en)
System, esp. for a winch used for lowering or raising a load (2) in a well, comprises an electric drive motor (6), a single control unit (10 a) indicating the load's direction of travel and speed, a sensor for the speed and direction, and a processor (9) which compares the speed and direction with information provided by the sensor and determines whether an increase or reduction in speed is needed. The system also incorporates a brake (8), and the processor (9) translates orders for a reduction in speed both to the motor and the brake. It also has a clutch (7) between the winch (5) and the motor (6), also controlled by the processor (9) and designed to disengage the motor if the load's speed of travel exceeds the motor's permitted speed of rotation. <IMAGE>
IPC 1-7
IPC 8 full level
B66D 1/46 (2006.01); E21B 44/00 (2006.01)
CPC (source: EP)
B66D 1/46 (2013.01); E21B 44/00 (2013.01)
Citation (applicant)
FR 2603942 A1 19880318 - FORASOL [FR]
Citation (search report)
- [A] US 3943713 A 19760316 - WALTON ERLEN B
- [A] GB 2049233 A 19801217 - HITACHI LTD
- [A] DE 2439609 A1 19750320 - HITACHI LTD
- [A] US 3887855 A 19750603 - KLIMO ROBERT G
- [A] US 3866468 A 19750218 - SMITH HUBERT IRVIN, et al
- [A] STOCKERT ET AL.: "Electrical equipment for the ten-rope winder of the 'Haard' mine", BROWN BOVERI REVIEW, vol. 72, no. 1, January 1985 (1985-01-01), BADEN, SUISSE, pages 37 - 46
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0688938 A1 19951227; FR 2721303 A1 19951222; FR 2721303 B1 19960906
DOCDB simple family (application)
EP 95401448 A 19950620; FR 9407520 A 19940620