Stefanyshyn A. Ptediction and increasing of sucker rods life with operational damage

The dissertation is devoted to improving the efficiency of sucker rods operational damage based on the use of effective technological process in the process of their repair, which provides their reliability and durability in the process of further operation. Proposed and introduced into production the recovery technology of sucker rods, which is to eliminate surface damage that occurs on the surface of the rod during operation (cracks, abrasions, uneven wear of a rod on diameter, damage owing to corrosion), a method machining, and the use of surface slander, which makes it possible to increase the fatigue strength of the rod and its other mechanical characteristics, as well as return a significant part of the used rods to operation. The influence of torsional stresses at complex loading of sucker rods is estimated at the stress state of the rod column, by assessing this type of load on the growth of the fatigue crack, which allows you to predict the resource during rotation of sucker rods rotator and determine the frequency of them defectoscopy, which will ensure trouble-free operation of the well. Obtained results of values under the action of different bending stresses on the restored repair rods according to the developed technology, due to the conducted tests and appropriate calculations, which made it possible to determine the limit of corrosion fatigue for different diameters of sucker rods. Received further development of the hybrid recovery sucker rods with cracks, which consists in the imposition of fiberglass bandages (l = 50cm, B = 10cm - 6 layers along the contour of the rod at the place of cracks) and epoxy resin, which makes it possible to extend their life by 15-20% when production of oil from deep wells is applied.