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1. WO2001044615 - COMPOSITE STATOR FOR DRILLING MOTORS AND METHOD OF CONSTRUCTING SAME

Publication Number WO/2001/044615
Publication Date 21.06.2001
International Application No. PCT/US2000/042082
International Filing Date 10.11.2000
Chapter 2 Demand Filed 08.06.2001
IPC
E21B 4/02 2006.1
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
4Drives for drilling, used in the borehole
02Fluid rotary type drives
F04C 2/107 2006.1
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
2Rotary-piston machines or pumps
08of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
10of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
107with helical teeth
CPC
E21B 4/02
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
4Drives for drilling, used in the borehole
02Fluid rotary type drives
F04C 2/1075
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS
2Rotary-piston machines or pumps
08of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
10of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
107with helical teeth
1071the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
1073where one member is stationary while the other member rotates and orbits
1075Construction of the stationary member
Applicants
  • EWM TECHNOLOGY, INC. [US]/[US] (AllExceptUS)
  • MURRAY, William, David [US]/[US] (UsOnly)
  • ROHDE, Heino, J. [US]/[US] (UsOnly)
  • KAECHELE, Bruno, Harald [DE]/[DE] (UsOnly)
Inventors
  • MURRAY, William, David
  • ROHDE, Heino, J.
  • KAECHELE, Bruno, Harald
Agents
  • ROMMELMANN, Douglas, W.
Priority Data
60/164,46010.11.1999US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) COMPOSITE STATOR FOR DRILLING MOTORS AND METHOD OF CONSTRUCTING SAME
(FR) STATOR COMPOSITE DESTINE A DES MOTEURS DE FORAGE ET SON PROCEDE DE CONSTRUCTION
Abstract
(EN) A composite stator (10) having first and second end portions (12, 14) , an external tube (16), an inner liner (18) and an elastomeric layer (20). The inner liner is formed of a rigid material and has a helical, multi-lobed configuration of uniform thickness. A plurality of helical spaces (22) are formed between the inner liner and the external tube. In a first embodiment, the ends of the inner liner are formed to a circular shape and welded (24a, 24b) to the external tube and the end portions. The helical spaces between the external tube and the inner liner may be filled with a thermally conductive material for heat dissipation and structural reinforcement. In a second embodiment, the inner liner ends have a multi-lobed shape. A passageway (122) is formed through the helical spaces between the external tube and the inner liner to allow a controlled amount of drilling mud to pass through and cool the inner liner. The inner liner is secured to the external tube via welding (26a, 26b, 26c), shrink-fitting, gluing or with restraining blocks (231).
(FR) L'invention concerne un stator composite comprenant une première et une seconde extrémité, un tube externe, un revêtement interne et une couche élastomère. Le revêtement interne est fabriqué à partir d'une matière rigide et présente une configuration hélicoïdale à lobes multiples d'épaisseur uniforme. Une pluralité d'espaces hélicoïdaux sont formés entre le revêtement interne et le tube externe. Dans un premier mode de réalisation, les extrémités du revêtement interne sont formées en arrondi et soudées au tube externe et aux extrémités. Les espaces hélicoïdaux situés entre le tube externe et le revêtement interne peuvent être remplis à l'aide d'une matière thermiquement conductrice pour dissiper la chaleur et renforcer la structure. Dans un second mode de réalisation, les extrémités du revêtement interne ont une forme à lobes multiples. Un passage est formé à travers les espaces hélicoïdaux, entre le tube externe et le revêtement interne, pour permettre à une quantité régulée de boue excavée de passer à travers le revêtement interne et de le refroidir. Le revêtement interne est fixé au tube externe par soudage, par ajustement fretté, par collage ou à l'aide de blocs de retenue.
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