Sacrificial anode and protective cathode-pumping rod anti-corrosive apparatus

Abstract

The invention relates to a pumping rod which can prevent metal corrosion. The pumping rod utilizes the principle of protecting a cathode by sacrificing an anode in electrochemistry and takes zinc, lead, magnesium and other active metals as the sacrificial anode which is designed into the anode of the pumping rod. During production, the nipple of the pumping rod is processed according to the technical specification of the pumping rod firstly and the length of the nipple is 400mm to 500mm; then the nipple is put into a specially designed rod cavity; magnesium or aluminium or zinc metal blocks are converted into liquid by heating and melting and then cast into the nipple cavity of the pumping rod; and shaping, thermal insulation, slow cooling, mold unloading and mechanical processing are carried out, a coarse blank is processed into a smooth revolution body, thread at the two ends of the pumping rod is processed, and collars are screwed, therefore, the anode assembly of the pumping rod is formed. When being installed and put into a well, a group of pumping rod anodes are assembled according to the length of every 60m to 80m and the installation method is as follows: during the process of putting down the pumping rod, the anode of the pumping rod is connected in series on a rod string and the up and down collars and thread are screwed.

Description

Technical field [0001] The invention relates to an oilfield anticorrosion technology, in particular to a technology capable of slowing down the corrosion of sucker rods. Background technique [0002] At present, the known oil field sucker rod anti-corrosion technology mainly adopts the method of surface coating protection, for example: the surface of the sucker rod is painted with anti-rust paint, or covered with epoxy resin coating, etc., and the sucker rod coupling adopts surface spray coating , or take the method of blackening the surface, or adopt the method of multiple penetration to the material, these methods undoubtedly play a certain protective effect on the anticorrosion of the sucker rod, but the effect is not good, the protection period is short, and the cost is high. In industrial enterprises, especially petrochemical enterprises, corrosion is a common problem that affects the normal production of enterprises. Corrosion is a kind of spontaneous and useless consu...

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Problems solved by technology

[0002] At present, the known oil field sucker rod anti-corrosion technology mainly adopts the method of surface coating protection, for example: the surface of the sucker rod is painted with anti-rust paint, or covered with epoxy resin coating, etc., and the sucker rod coupling adopts surface spray coating , or adopt the method of blackening the surface, or adopt the method of multiple penetration to the material, these methods undoubtedly have a certain protective effect on the corrosion protection of the sucker rod, but the effect is not good, the protection period is sh

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