Kinetics Of Well Sucker Rod Eccentric Wear And Countermeasures

Oil well pumping unit is the world’s oil industry, the traditional method of oil extraction, And so far has been the dominant way of artificial lift, The production of oil wells across the country, about80%of the rod pumping is the use of technology,75%of oil production is taken out of the rod. Sucker rod pumping system is the main force component The production process of pumping wells, as well structure limits buckling rod string, and string bending, and other factors influence the nature of produced fluid, resulting in between the rod and tubing wear and tear. Also, because of various ions produced fluid effect on the corrosive sucker rod, eccentric wear and corrosion and promote each other, even greater damage on the rod, resulting in leakage of oil well tubing wear, wear down off the sucker rod, etc. makes the oil wells back frequently, check the pump cycles, maintenance workload increases, has seriously affected the normal production wells and oil run economic benefits. At present, especially with mid-and late into the oil field development and exploitation of the deep low permeability reservoir of bad post-injection, the pressure reduced, the pump setting depth deepened, the water cut increased year by year and other factors, combined with strong mining years of strong injection, resulting in well condition to further deterioration, resulting in rods, tubes in the deteriorating conditions of service underground, oil intensified the phenomenon of partial wear bar has seriously affected oil production, For the partial abrasion of oil, domestic and foreign oil workers made a lot of research, but also achieved some results, a variety of measures to prevent partial wear have emerged, but the mechanism of partial wear of rod and tubing is not perfect, and anti-theoretical model partial wear does not apply and other reasons, preventing side wear phenomenon of the failure of a large proportion still. Therefore, it is necessary for the rod tube wells for further study of partial abrasion.OCTG rod eccentric wear caused by many reasons, a depth of structure, caused by partial wear well trajectory; rod, tube of elastic deformation, instability caused by partial wear; high water content such as increased output of fluid partial wear; wellbore conditions and work system, causing partial wear and other aspects. And has been put into operation for a well or wells for the exploitation of the late, tubing and rod in contact force between the (positive pressure) is caused mainly due to eccentric wear, while the sucker rod string or the instability of oil buckling, but also lead to the following neutral partial rod and tubing wear of the important reasons, the process of the next stroke, the rod under pressure in the axial sinusoidal or helical buckling occurs, making the rod closely aligns the tubing, resulting in positive pressure, eventually causing the oil rod eccentric wear. Therefore, a reasonable mathematical model of the forces of oil bar for dynamic analysis of three wells in the eyes of sucker rod buckling deformation, partial to a correct understanding of rod and tubing wear for the late development of theoretical measures for preventing side wear basis for a reasonable system of pumping wells is conducive to slow down the work of eccentric wear of rod and tubing, according to the dynamic analysis of software applications accurately determine the appropriate position eccentric wear anti-bias based on detailed measures of rod and tubing wear of the comprehensive management side of practical significance.