Sacrificial anode and protective cathode-oil pipe anti-corrosive apparatus

Abstract

The invention relates to an oil pipe which can prevent metal corrosion. The oil pipe 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 oil pipe. The production method is as follows: the nipple of the oil pipe is processed according to the technical specification of the oil pipe 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 oil pipe; 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 oil pipe is processed, and collars and joints of the oil pipe are installed, therefore, the anode assembly of the oil pipe is formed. When being installed and put into a well, a group of oil pipe 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 oil pipe, the anode of the oil pipe 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 oil field anticorrosion technology, especially a technology capable of slowing down the corrosion of oil pipes. Background technique [0002] At present, the known anticorrosion technology of oilfield tubing mainly adopts the method of surface coating protection. The material adopts multiple infiltration methods. These methods undoubtedly have a certain protective effect on the anticorrosion of the oil pipe, 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 consumption that occurs in most metals every moment. The losses and consequences caused by this consumption are very Seriously, it not only wastes a lot of metal raw material resources, but also makes production stop, material flow, equipment cost in...

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Problems solved by technology

[0002] At present, the known anticorrosion technology of oilfield tubing mainly adopts the method of surface coating protection. The material adopts the method of multi-component penetration. These methods undoubtedly have a certain protective effect on the anti-corrosion of the oil pipe, 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 consumption that occurs in most metals every moment. The losses and consequences caused by this consumption are very Seriously, it not only wastes a lot of metal raw material resources, but also makes production stop, material flow, equipment cost increase, product quality decrease, service life shorten, pollute the environment, and even cause various accidents

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