Mechanism Analysis Of Uneven Abrasion For High Pour-point Oil Wells And Application Of Its Prevention Technology

The trend of leaning attrition problem of pumping units well's rod and tube is increasing among almost all large domestic oil fields in recent years, which leads to the result one-third of maintenances work is caused by leaning attrition. Aim at the question, base on the force analysis on the rod and tube in pumping units well, take the rod and tube leaning attrition distribution rules of Shenyang oil field into consideration, synthetically analyze factors which affect leaning attrition, like the bump diameter of pumping units well, containing water rate, sinking degree and sucking parameter, finally leaning attrition mechanism is come out. When oil well is coming into containing water stage, water rate of liquid exploited from oil is quite high so this kind of liquid deteriorates the lubrication condition between rod and tube and aggravates the leaning attrition phenomena."Liquid Beating"happens easily while pumping units well is running under high water rate and low sinking degree, damp of rod pricks up, at same time the wax was separated out in pump because natural gas was escaped from crude oil ahead at low sinking degree, this makes axis distribution stress of pumping units rod drop and centralized axis stress of pump port increase, all the above mentioned result in the leaning attrition. What is more, big sucking parameter in pumping units well also leads to the force on rod go towards trend of leaning attrition. The measures of prevention leaning attrition include using device of rectify implement to restrict rod, improving attrition capability of rod connector by choosing durable material, optimizing oil well spot condition and improving force on pumping units rod.