Patent ID: 7980301

Claim:
A method of providing a constant dampening counterforce for dampening the shocks in production wells having a tubing pump comprising the steps of: a) positioning a device consisting of a elongated damper cylinder and damper chamber connected to each other, and the top of said elongated damper cylinder connected to the bottom of tubing string in borehole of the well filled by liquid, and the bottom of said chamber connected to the top of tubing pump, and the internal diameter of said elongated damper cylinder is less than internal diameter of tubing pump cylinder; b) providing a damper plunger within said elongated damper cylinder and said damper plunger is connected to pumping unit by means of at least one sucker rod and polish rod at its upper end and said damper plunger is connected to tubing pump plunger its lower end by means of at least one sucker rod; c) moving damper plunger through the elongated damper cylinder on upstroke to compress liquid inside said damper chamber; d) creating a constant dampening counterforce inside damper chamber due to said compression of liquid in said damper chamber as a result of constant hydrodynamic resistance of liquid flowing through at least one channel made in damper plunger into the internal volume of said tubing string above said damper plunger thereby providing an additional constant pressure in damper chamber resulting in providing of said constant dampening counterforce inside damper chamber which is determined by a formulae: F = π 3 128 ⁢ k ⁢ ⁢ ρ ⁢ L 2 t 2 ⁢ ( D 2 - d 2 ) 3 S 2 , where F is a constant dampening counterforce, k is experimental coefficient of hydrodynamic resistance varied between 3 to 7, ρ is density of liquid in borehole of the well, L is length of stroke, t is the time of upstroke, D is diameter of tubing pump plunger, d is diameter of the damper plunger, S is the square area of at least one channel in the damper plunger, π equals 3.1415.