Anti-vibration system for pc pumps

Abstract

A centralizer is taught for installation on a well string or a PC pump, the centralizer comprising: a body with a central longitudinal opening, drag blocks retained on the body and a rubber spring biasing each drag block radially outwardly from the body. A PC pump assembly is also taught comprising: a pump including: a stator in which a rotor moves, the stator including an upper end and a lower end, and a centralizer on the stator, the centralizer including centralizing blocks that are normally outwardly biased and resiliently collapsible, the centralizing blocks having an outer diameter greater than the stator outer diameter.

1 . A wellbore centralizer for installation on a well structure, the wellbore centralizer comprising: a body with a central longitudinal opening, drag blocks retained on an outwardly facing surface of the body and a rubber spring biasing each drag block radially outwardly from the body. 
     
     
         2 . A wellbore structure comprising: a PC pump including a rotor, a stator in which the rotor moves, the stator including an upper end, a lower end and an outer diameter, and a centralizer on the stator, the centralizer including centralizing blocks that are normally outwardly biased and resiliently collapsible, the centralizing blocks defining a centralizer outer diameter greater than the stator outer diameter. 
     
     
         3 . The wellbore structure further comprising: a upper tubing coupled onto the upper end of the stator; a centralizer coupled onto the upper tubing; a lower tubing coupled onto the lower end of the stator; and a lower centralizer coupled onto the lower tubing. 
     
     
         4 . A method for addressing downhole vibration damage of a PC pump in a well, the method comprising: installing a wellbore centralizer on a stator of the PC pump, wherein the wellbore centralizer includes centralizing blocks that are normally outwardly biased and resiliently collapsible, the centralizing blocks defining a centralizer outer diameter greater than a stator outer diameter; moving the PC pump and the wellbore centralizer into the well including compressing the centralizer blocks radially inwardly to be constrained within an inner diameter of the well; moving the PC pump into position within the well; and operating the PC pump while the wellbore centralizer resists deflection of the stator.