Rod pump oil recovery is the most widely used method of mechanical oil. At present, as the oilfield enters the middle and late stages of development, the liquid supply capability of the oil well deteriorates, the pumping depth increases year by year, the downhole tubular string is more complicated, the eccentricity of the pipe rod is serious, the corrosiveness of the produced fluid is increased, Chemical corrosion and electrochemical corrosion exist at the same time; In addition, as the oilfield enters the high water cut period, the increase of water content reduces the lubricity of the well fluid and increases the friction coefficient; the proportion of wax content in the crude oil in the formation rises continuously, Increase, work load increased. These have exacerbated the rod pump failure. Oil pump failure mainly due to the following: Wear: Pump barrel and plunger pump core is the two components, constitute a moving friction pair, the friction between the normal wear and tear is inevitable. Sanding Buried Sanding Card: The increasingly severe sand formation leads to abnormal abrasive wear and scratches on the friction pair between the plunger and the pump barrel. Large amounts of grit will trap the fixed valve and cause sand burying and sanding cards . Corrosion: The corrosive medium in well fluid will cause serious corrosion damage to all parts of the oil pump. In severe cases, the plunger is perforated and the plunger chrome layer is off. The above failure of a serious impact on the normal production of the oil field, so check pump cycle shortened. In these failures, 70% of pump failures result from wear and tear between the pump barrel and the plunger. Therefore, the main idea to solve the pump failure problem is to improve the abrasion resistance of the cylinder and plunger friction pair. Under normal circumstances, to improve the wear resistance of a workpiece surface is the main method of surface treatment to improve the hardness of the workpiece surface, but this will inevitably cause greater wear and tear pairs of friction damage and careless, resulting in the overall friction can not improve the service life . In response to the above, Anton Oil Technology (Group) Co., Ltd. successfully developed into aof bidirectional protection pump, the pump by optimizing the matching, the bi-directional protection of the alloy material is applied to the plunger surface, the plunger surface to improve wear At the same time, effectively reduce the wear on the inner surface of the pump cylinder, thereby enhancing the overall life of the friction pair. The main components of the alloy material include chromium and nickel, these two elements coexist and remelting process can be obtained single-phase micro-crystal austenite, with excellent corrosion resistance; chromium remelted in the surface after the formation of a layer Thin dense chromium-enriched dense passivation film, with excellent oxidation resistance; alloy materials, the right amount of silicon, boron and other non-metallic elements with nickel, chromium to form a hard silicide and boride, these hard points Dispersion in the soft nickel-chromium matrix, play the role of dispersion strengthened, as a whole to improve the hardness of the coating, but also improve the coating anti-wear properties. In addition, the coating also contains anti-friction elements, the anti-friction element in the plunger and pump cylinder friction occurred during the transfer, the pump cylinder to form a uniform distribution of the surface of the sheet-shaped anti-wear elements, play a solid lubricant Reduce the friction coefficient and protect the pump cylinder. The use of new materials technology to improve the wear resistance of the pump as a whole, while less structural changes to ensure that the overall structure and specifications of the aof bidirectional protection pump consistent with the ordinary pump, which makes us have reason to believe that aof bidirectional protection pump Will replace the ordinary pump and get more widely used as a tool to improve the technological level of oil field development.
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