Mechanism Research Of Pumoing Unit Load Shedding Device

Sucker rod pumping is a kind of traditional mechanical oil extraction. With the extensionof oilfield development time, the exploitation of oil reservoir obtained more and more use. Todevelop this kind of reservoir mainly adopts small pump depth. Because deep pumpingtechnology small pump is pumping unit rated load and polished rod quality constraints, thepump depth is under certain restrictions.Pumping unit load shedding device is a down hole tool in producing well, can reduce thepumping unit horse head load and polished rod stress through its own hydraulic feedbackforce, solve the problem of the existing pumping equipment rated suspension point load andsucker rod string is overweight.This paper analyzes the principle of reducing load of the pumping unit load reduction,concludes the calculation method of the residual and the well depth, studies the generalstructure design and calculation method of pumping unit load reductionAfter adding load shedding device, the stress of the rod string changes, analysis andcalculation of the lightening rod string, make fatigue strength check for the recombination ofrod string. For lightening rod string is analyzed with mechanics, and the lightening isobtained after the method for calculating the polished rod load. Making some hypothesis toestablished a lightening rod string dynamic mathematical model, and established in ANSYSenvironment lightening finite element model of rod string and calculate the staticdisplacement deformation and stress of rod string data, simulate the lightening rod stringdynamic characteristics in four time zone.J2-10Wells in zhejiang oilfield as an example forlightening of lightening the ability to do the verification experiment.