A preparation process of ultra-high molecular weight polyethylene sucker rod centralizer

Abstract

The invention provides a producing process of a sucker rod centralizer made of ultrahigh-molecular-weight polyethylene. A filler is prepared from the following components by weight: 1% to 1.5% of graphite, 1.5% to 2% of carbon black, 1% to 1.5% of calcium stearate, 0.4% to 1% of pyrogenic silica, 1% to 2% of titanium dioxide, 0.5% to 1% of a coupling agent vinyl siloxane, and 90% to 95% of ultrahigh-molecular-weight polyethylene, wherein the total percentage by weight of the components is 100%. The producing process comprises the following steps: pouring the filler into the upper part of a lower sucker rod centralizer die, carrying out die assembly, putting assembled dies into a press machine for pressing to obtain a blank, and starting to heat to ensure that the filter is heated and melts into liquid gradually; filling a sucker rod centralizer die cavity with the liquid filler, continuing heating and pressing till a product is shaped, carrying out pressure-maintaining cooling, opening dies, and taking out of a finished product. According to the producing process, the material performance and the processing manner of ultrahigh-molecular-weight polyethylene are improved, so that the improved ultrahigh-molecular-weight polyethylene can be used for producing the sucker rod centralizer, and the sucker rod centralizer made of the improved ultrahigh-molecular-weight polyethylene material has higher chemical corrosion resistance, abrasion resistance and impact resistance, and longer service life.

Description

technical field [0001] The invention relates to the manufacturing technology of a sucker rod centralizer, in particular to a preparation process of an ultra-high molecular weight polyethylene sucker rod centralizer. Background technique [0002] At present, the main method of oil extraction in oilfields at home and abroad is to pump oil wells. The sucker rod is used to transmit power to the pump to extract crude oil. The sucker rod centralizer is mainly used in the rod pump pumping equipment of the oil field. A key component on the rod to prevent the eccentric wear of the tubing is the downhole tool for preventing the eccentric wear of the oil pumping well. It is connected to the sucker rod. The material of the rod centralizer has the characteristics of high strength, wear resistance and good lubricity. The contact with the oil pipe will cause the wear of the sucker rod centralizer, thereby reducing the wear of the oil pipe and achieving the purpose of preventing partial wea...

AI Technical Summary

Problems solved by technology

Compared with the performance of PA, it overcomes the shortcomings of water absorption expansion and low temperature brittleness. Because of its series of advantages, it is very suitable for the material of sucker rod centralizers. At present, there are only literature reports on the excellent characteristics of ultra-high molecular weight polyethylene, but ultra-high molecular weight polyethylene High-molecular-weight polyethylene has poor fluidity, is difficult to process by injection molding, and has defects in surface hardness, high-temperature resistance, and wear resistance, which limit its popularization and application. No manufacturer can use ultra-high-molecular-weight polyethylene to produce sucker rod centralizers

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