Title:
METHOD OF MAKING STATORS FOR MOINEAU PUMPS
Document Type and Number:
WIPO Patent Application WO1999031389
Kind Code:
A3
Abstract:
The present invention provides methods of forming mud motors. In one method, rollers are urgingly stroked against a tubular member having a mandrel therein that has an outer profile which is the inverse of the desired profile of the stator. In another method, rollers are urged and rotated radially on the tubular member with the mandrel disposed in the tubular member. In yet another method, dies are pressed against the tubular member having a mandrel with a desired outer profile. In another method, a molten metal is deposited over a mandrel with an outer lobed surface that is substantially the inverse of the desired inner profile of the stator housing. The mandrel is then removed, leaving a metallic longitudinal member having an inner profile defined by the outer profile of the mandrel. The mandrel may also be a preformed liner of desired thickness having an inner and outer lobed surface. In each of these methods, the inner surface of the resulting member has the profile defined by the outer profile of the mandrel. The inner surface of the resulting member then may be coated or lined with a suitable material such as an elastomer or a ceramic. The stator inner surface may also be metallic. A suitable rotor is then disposed in the stator to form the drilling motor.
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Inventors:
KRUEGER VOLKER
WALTERSKOETTER MARKUS
REGENER THORSTEN
WALTERSKOETTER MARKUS
REGENER THORSTEN
Application Number:
PCT/US1998/026963
Publication Date:
September 02, 1999
Filing Date:
December 17, 1998
Export Citation:
Assignee:
BAKER HUGHES INC (US)
International Classes:
B21C37/20; C23C4/18; E21B4/02; F04C2/107; (IPC1-7): F04C2/107; B21C37/00
Foreign References:
| FR2299533A1 | 1976-08-27 | |||
| DE4111166A1 | 1992-10-08 | |||
| FR2155827A1 | 1973-05-25 | |||
| US5145342A | 1992-09-08 | |||
| DE2541779A1 | 1977-03-31 | |||
| DE2707901A1 | 1978-08-31 | |||
| US5645896A | 1997-07-08 |
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