METHOD OF SUCKER RODS STRINGS ASSEMBLY AND SUCKER RODS STRING STAGE Russian patent published in 1996 - IPC

FIELD: method is used for mechanized liquids extraction from wells. SUBSTANCE: sucker rods string is composed on the base of its loading in well by assembling it as one or two stage so, that each stage has sucker rods string with different diameters of body and with uniform for the sucker rods connecting size of heads. Rods are set in string each stage beginning with bigger diameter of body to smaller one. Rod body diameter is made smaller than comparison diameter of given type and size rod body and equal or exceeding body comparison diameter of following type and size with maintaining connecting size of heads of given size rods. EFFECT: method allows to realize mechanized liquids extraction from wells. 2 cl, 4 dwg