EP 0209310 A3 19880511 - AXIAL BALANCING DEVICE FOR DOWNHOLE DRILLING MOTORS
Title (en)
AXIAL BALANCING DEVICE FOR DOWNHOLE DRILLING MOTORS
Publication
Application
Priority
GB 8517747 A 19850713
Abstract (en)
[origin: EP0209310A2] A downhole drilling motor is described which has an outer drill casing (11), a shaft (12) for driving a drill bit connected thereto, and the shaft (12) being rotatable relative to the casing (11). A turbine (15) is disposed between the casing (11) and the shaft (12) to permit the shaft (12) to be rotated. A pressurised fluid can be admitted via an inlet (13) and is transmitted to the turbine (15) via a passage (20) to effect operation. The shaft is provided with reaction means which includes a sleeve (17) mounted on the shaft (12) and which sleeve and shaft have pressure surfaces (23, 24) which can be acted on by the pressure fluid to produce a force acting counter to the normal hydraulic thrust on the shaft (12) to produce a reduced resultant hydraulic thrust on the shaft (12). In a preferred arrangement, the reaction member and thrust bearing is located above the turbine (15) so that the unit can be replaced as a whole.
IPC 1-7
IPC 8 full level
E21B 4/02 (2006.01); F03B 13/02 (2006.01)
CPC (source: EP)
E21B 4/02 (2013.01); F03B 13/02 (2013.01)
Citation (search report)
- [X] FR 1161543 A 19580901
- [A] GB 781860 A 19570828 - BATAAFSCHE PETROLEUM
- [A] US 4260032 A 19810407 - FOX FRED K
- [A] US 4493381 A 19850115 - KAJIKAWA MASAUEMON [JP], et al
- [A] US 4308927 A 19820105 - FOX FRED K
- [A] FR 2240345 A1 19750307 - ALSTHOM CGEE [FR]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0209310 A2 19870121; EP 0209310 A3 19880511; GB 8517747 D0 19850821
DOCDB simple family (application)
EP 86305258 A 19860708; GB 8517747 A 19850713