The Study Of The Mechanism And Prevent Step About The Attrition Phenomenon Of Waterflooding Pumping Units Well's Pole And Tube's

The trend that the leaning attrition phenomenon of waterflooding pumping units well's pole and tube is increased year after year, that become the one of main reason to affect to checking pump. Aiming at the question, the pole and tube leaning attrition distribution rules of Daqing No.5 oil field were analyzed in this paper, we concluded that the main reason affecting the leaning attrition are water, sinking degree, swabbing parameter, pump clearance grade ,and so oa Pumping units's rod is separated to a system of spring-mass-damp oscillation and the simulation method of liquid burthen of pump is mended; the new simulation axis distribution stress method of pumping units's rod is set up, the helix bend differential equation were set up. The sucker rod and the restrict condition were considered, the axis critical force and the wave peak expressions were educed at the time after time helix bend in the vertical well. The graph of bend sucker rod was protracted. The distortion flexion rules of sucker rod were gained in the vertical well The produced max bend flexion of sucker rod are nearby the counteracting point always, down bend flexion the value of y is little by little. So the sucker rod and the oil tube can't but contact by the counteract point, that were main friction, and along with the flexion times increasing of the sucker rod, the wave peak move down, the wavelength turn to shorter, and the critical load of distortion flexion turn to bigger. With the critical conditions of rod knuckle distortion, the critical leaning attrition conditions of rod is set up and the critical leaning attrition conditions used now is pointed out to be wrong. With the model of new simulation axis distribution stress, centralized axis stress of pump port and the critical leaning attrition conditions, the leaning attrition mechanics mechanism of rod is brought forward. That is: owning to the depress of produce flow pressure, the part of the sucker parameter more big, the low sinking degree oil well are manifold year after year. Because the natural gas were escaped form oil ahead, at the low sinking degree oil well the wax were separated out in the oil well or pump. And the heat wash period of some oil well weren't in reason, the max produced in the sucker rod and pump, the leaning attrition were bring in some oil well. At the same time, for the increasing scale of containing water in oil field and according to this, "liquid beating" come into being in well of high scale of containing water and the low sinking degree, the damp of rod pricks up, the next question is advanced that the axis distribution stress of pumping units's rod drops and leaning attrition is pricked up. And for the accretion of sucker parameter, the rod and tube leaning attrition ratio increased. The way of prevention leaning attrition include the device of rectify implement and aggravation rod, optimize sucker parameter.