Method for calculating the plunger hanger in the cylinder of the sucker-rod pump

UDK: 622. : 621.653
DOI: 10.24887/0028-2448-2018-2-80-84
Key words: sucker-rod pump, well workover, adapting the plunger stripping, dynamic head (level), deformation
Authors: R.N. Bakhtizin (Ufa State Petroleum Technological University, RF, Ufa), K.R. Urazakov (Ufa State Petroleum Technological University, RF, Ufa), S.F. Ismagilov (Ufa State Petroleum Technological University, RF, Ufa), R.I. Bakirov (Bashneft-Dobycha LLC, RF, Ufa), I.R. Bashirov (Bashneft-Dobycha LLC, RF, Ufa), A.V. Kiselev (Bashneft-Dobycha LLC, RF, Ufa), F.F. Davletshin (Ufa State Petroleum Technological University, RF, Ufa)

The article presents a method for calculating plunger hanger to make it fit to cylinder after well workover. In general, the technique is based on the calculation of the effective plunger stripping. An example of calculating the plunger hanger for hypothetical well is given. It can be seen that proposed methodic allows to make possible the operation of the pump without a stroke both during the stabilizing the flow and during the operation at the steady flow. The calculations are based on a quasi-static model of mutual deformations of the rods and production strings, also considering the nature of alteration in deformations with the dynamic level lowering.

A technique for correcting the plunger, stripping which operates with the stroke to the inlet valve or pump casing, by the actual dynamogram is proposed. As a rule, plunger strokes are reflected as a “splash” shape of loads on the dynamogram at the end of the polished rod travel. This method allows, based upon extreme values of loads on the actual dynamogram, to calculate the value of the minimal distance, by which the depth of the plunger hanger should be altered, in order to exclude kicks.

The obtained results can be applied in design of wellwork, in particular for downhole operations of wells equipped with sucker rod pumps.


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