DOWNHOLE SCREW MOTOR GEARED-ROTOR MECHANISM

oil gas industries; well drilling. SUBSTANCE: invention can be used also in screw pumps for recovery of oil and transfer of liquids. Geared-rotor mechanism of downhole screw motor has stator with internal helical teeth made of elastic material and rotor with external helical teeth whose number is le...

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Bibliographische Detailangaben
Hauptverfasser:	KOCHNEV A.M, BOBROV M.G, SUSLOV V.F, KOROTAEV JU.A, TSEPKOV A.V
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	BLASTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINE PLANTS IN GENERAL FIXED CONSTRUCTIONS HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	oil gas industries; well drilling. SUBSTANCE: invention can be used also in screw pumps for recovery of oil and transfer of liquids. Geared-rotor mechanism of downhole screw motor has stator with internal helical teeth made of elastic material and rotor with external helical teeth whose number is less than that of stator teeth by one. Profiles of external helical teeth of rotor and internal helical teeth of stator are made relatively envelopable in end face section. Leads of helical teeth of rotor and stator are proportional to their teeth number. Thickness Ct of stator tooth in pitch diameter of teeth and peripheral pitch St of teeth in end face section perpendicular to axis O2O2 of geared- rotor mechanism are related by equation Ct/St= 0,45÷0,65.> In normal section N-N perpendicular to direction of helix M-M of stator tooth, thickness CN of tooth 2 of stator 1 in pitch diameter Dp of teeth and radial height h of stator tooth are related by equation CN/h >= 1,75. EFFECT: improved performance characteristics, reliability and increased service life.