Remanufacturing method of polished rods of oil pumping units and polished rods of oil pumping units
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A pumping unit and remanufacturing technology, which is applied in the manufacture of tools, drill pipes, earthwork drilling, etc., can solve the problems of waste of resources, wear and tear, lack of interchangeability, etc., and achieve cost saving, low manufacturing cost and high efficiency Effect
Inactive Publication Date: 2019-05-17
SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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Problems solved by technology
After a certain period of use, the polished rod of the pumping unit will be worn at the contact sealing part with the packing. If the wear is serious, the rod must be replaced. Usually, the replaced polished rod is treated as scrap, especially the polished rod with one end upset, which is not interchangeable. Cannot be reused, resulting in a great waste of resources
Some people also propose to repair the worn surface to reuse the polished rod, but the cost of the method used is too high to be suitable for remanufacturing repair or the quality of the repaired product cannot meet the performance requirements of the product. There is no mature remanufacturing method for repairing the polished rod of the pumping unit
Method used
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Embodiment 1
[0076] A method for remanufacturing a polished rod of a pumping unit, the specific operation steps are as follows:
[0077] 1) Classify and sort the recovered waste polished rods, classify them according to size and type, and store the polished rods of the same size and specifications. After sorting, each polished rod of the pumping unit includes the front intact section 1, the worn section 2 and the rear intact section 3;
[0078] 2), as attached figure 1 As shown, the above-mentioned different types of polished rods are cut according to the maximum length of the worn section 2. After the worn section 2 is removed, the front intact section 1 and the rear intact section 3 are retained. The method used for cutting is mechanical processing. 1 shown in the figure is the unworn front intact section with a length of L1; 2 is the intercepted worn section with a length of L2; 3 is the unworn rear intact section with a length of L3; the total length of the polished rod is L0;
[007...
Embodiment 2
[0084] Provide the embodiment that carries out the polished rod recycling of pumping unit below.
[0085] (1) Select one specification and 10 polished rods of pumping units with a length of L0 for processing;
[0086] (2) After confirmation, the maximum length of the worn section 2 is L2, and all the polished rods of the pumping unit are intercepted according to the unified standard. For L1, L2, L3;
[0087] (3) Select three intact segments 3, cut out the connecting segments 4 corresponding to the worn segments, cut out three connecting segments 4 for each intact segment 3, and cut nine connecting segments 4 out of three intact segments 3, The length of each connecting section 4 is L2+50mm;
[0088] (4) The above steps obtain 10 front intact segments 1, 9 connecting segments 4 and 7 rear intact segments 3;
[0089] (5) A front intact section, a connecting section and a rear intact section are welded and connected into a complete polished rod of the pumping unit by the frict...
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Abstract
The invention provides a remanufacturing method of polished rods of oil pumping units. The remanufacturing method comprises the steps that step 1, the abrasion section of a polished rod of a certain oil pumping unit is cut off to obtain an intact section of the polished rod of the oil pumping unit; step 2, a connecting section matched with the abrasion section is cut off from the polished rod of another oil pumping unit; step 3, friction welding connection is carried out on the intact section obtained in the step 1 and the connecting section obtained in the step 2; and step 4, post-processingis carried out on the friction welding connection part in the step 3. According to the remanufacturing method, abrasion parts of the polished rods are removed by using existing waste polished rods andadopting a sectional material obtaining method, non-abrasion parts of the polished rods are spliced to the design size by friction welding, and surface processing is carried out to meet the size requirement of the polished rods. The remanufacturing method is characterized in that friction welding is adopted to carry out splicing welding, the bonding part is metallurgical bonding, and through process control, the splicing welding is carried out below the phase change point of a material, so that embrittlement of a heat affected zone is reduced, and the remanufactured polished rods can be recycled by turning waste into treasure.
Description
technical field [0001] The present invention relates to the technical field of remanufacturing, and more specifically relates to a method for remanufacturing a polished rod of an oil pumping unit and a polished rod of an oil pumping unit prepared based on the method, especially a remanufacturing method based on friction welding technology. Background technique [0002] Pumping unit polished rod is a standard length and diameter rod with a surface roughness designed to easily form a pressure seal in the seal box and provide a mechanical connection between equipment inside and outside the oil well. [0003] The polished rod of the pumping unit is mainly used for the connection related to the downhole sucker rod, and cooperates with the wellhead packing to seal the pumping wellhead. According to the shape, the polished rod is divided into two types: ordinary and one-end upsetting type. Both ends of the ordinary polished rod have the same polished rod external thread, and there ...
Claims
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Application Information
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