Impressed current negative pole protective device of self-elevating platform and protective method thereof

Abstract

The invention relates to the technical field of metal corrosion prevention, in particular to an impressed current negative pole protective device of a self-elevating platform and a protective method thereof. The device comprises an auxiliary positive pole (4), a reference electrode (7), current control equipment (1) and a cable, wherein the current control equipment (1) is arranged on the self-elevating platform (9), the auxiliary positive pole (4) and the reference electrode (7) are fixed on a pile shoe (8) of the self-elevating platform (9) through additional plates (5), and the auxiliary positive pole (4) and the reference electrode (7) are electrically connected with the current control equipment (1) through the cable which can be coiled and uncoiled in a longitudinal mode. The cable enters into the interior of the pile shoe (8) of the self-elevating platform (9) through a water sealing part. The impressed current negative pole protective device is simple in structure, convenient to install, long in service life and low in cost, has no potential marine ecology pollution hidden troubles, provides effective protection for the self-elevating platform under the condition that load of the self-elevating platform is not increased, and prevents the self-elevating platform from being corroded by sea water.

Description

technical field [0001] The invention relates to the technical field of marine metal anticorrosion, in particular to an impressed current cathodic protection device for a self-elevating offshore platform and a protection method thereof. Background technique [0002] The jack-up platform, also known as the pile-foot drilling platform, is a steel structure platform and is currently the most widely used drilling platform. This kind of oil platform is loaded with drilling machinery, power, equipment, living equipment and a number of liftable legs. When raised, the platform and the barge can be towed by the tugboat to a new well position. Since seawater is a strong corrosive medium, if effective anti-corrosion measures are not taken, the jack-up platform will suffer corrosion damage in the harsh marine environment, which will shorten the service life of the platform and increase the maintenance cost of the platform [0003] Corrosion control of steel structure platforms in marin...

AI Technical Summary

Problems solved by technology

However, since the lifting system of the self-elevating platform adopts the rack and pinion type and the hydraulic jacking type, the platform and the legs of this lifting structure design are tightly combined, the space is compact, and the gap is narrow, so it is not allowed to install large-sized sacrificial objects on the legs. anode

The design life of the jack-up oil production platform is 20 years, and the small-sized anode is difficult to achieve the purpose of long-term protection, so it needs to be frequently docked for replacement, which affects the normal operation of the platform and increases maintenance costs

Moreover, the installation of sacrificial anodes will inevitably increase the lifting load of the pile legs, which puts forward higher requirements for the design of the lifting structure, and the construction cost will also increase accordingly.

Therefore, in the cathodic protection of jack-up drilling platform legs, the weight and size of the anode become the two bottlenecks of sacrificial anode protection technology

In addition, a large amount of aluminum, zinc and heavy metal ions are released into the seawater during the dissolution process of the anode, which poses a potential threat to the marine ecology. Since the electrolytic aluminum industry is a high energy-consuming industry, the smelting and dissolution consumption of sacrificial anodes have caused harm to the natural environment. double pollution

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