| 摘要 |
FIELD: engines and pumps. ^ SUBSTANCE: invention relates to oil-and-gas production, particularly to downhole motors (DHM) designed drill oil and gas wells. Proposed DHM comprises a section of working elements, i.e. stator and rotor arranged off-center inside the former, spindle section and internal joint assembly representing S-like bent torsion arranged below the rotor or inside it. Said torsion has working length L and diametre d set by the following ratios where ë=2ÇZn, Z is the number of rotor teeth, E is elasticity factor, MPa; ü is specific weight, kg/m3; G is axial force, "ÿ"; n is frequency of revolution, s-1; a, b are dimensionless parametres-coordinates set proceeding from internal part of torsion stability area limited by lines a=-3b+19, a=0, a=b; a=-b+4. ^ EFFECT: longer life and higher reliability. ^ 2 cl, 3 dwg |
