Pulse current based oil well casing cathode protection system and electrode arrangement method thereof

Abstract

The invention relates to a pulse current based oil well casing cathode protection system. The pulse current based oil well casing cathode protection system comprises a pulse power supply which is connected with an oil well casing and an anode well system, and a soil medium is arranged between the oil well casing and the anode well system. The electrode arrangement method of the pulse current based oil well casing cathode protection system comprises the following steps: (1) determining the position of an anode well; (2) determining the depth of the anode well; (3) determining the connection method of anode cables; (4) determining the connection method of cathode cables; and (5) directly binding a reference electrode on the oil well casing through coating an insulating material, and communicating a potential measuring instrument with the reference electrode and a cathode so as to monitor the protective potential in real time, wherein the reference electrode can be bound on different points of the oil well casing. The protective potential is adjusted in real time by adopting an automatic adjustment system of the pulse power supply according to the feedback data of the potential measuring instrument so that the oil well casing is in an effective protection range all the time. The pulse current based oil well casing cathode protection system provided by the invention has the characteristics of protective current transmission, high anode utilization rate, high efficiency, wide range of application, long service life of an anode, simple maintenance and high protection degree.

Description

technical field [0001] The invention belongs to the technical field of corrosion and protection of oil wells in oil fields, and relates to a pulse current-based oil well casing cathodic protection system and an electrode layout method, which are used for limiting protection current attenuation and delaying anode failure. It can be applied to the field of oil well casing, and can also be further extended to the field of gas well casing. Background technique [0002] The reasonable electrode placement method of the pulse current cathodic protection system is not only related to the long-term operation of the entire protection system, but also plays a vital role in the protection effect of the oil well casing. The existing cathodic protection electrode layout method is difficult to ensure the difference between the potential of the anode after the circuit is connected and the potential of the oil well casing after cathodic polarization, that is, the effective voltage; The reac...

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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a pulse current-based oil well casing cathodic protection system and an electrode layout method. , anode well depth, cathode wiring position, reference electrode layout and electrical connection point connection method for a reasonable layout; the protection effect of the oil well casing cathodic protection system, the protection depth of the oil well casing and the prerequisites for the service life of the anode are reasonable electrode layout position method; the electrode layout structure of the oil well casing cathodic protection system powered by pulse current not only solves the problem that the anode material will cause the anode to shrink when the cathodic protection system is running, and the end will be consumed quickly, which will affect the life of the anode system; at the same time, due to The pulse current transmission distance is far, and the protection current can be transmitted to a longer distance when the oil well casing cathodic protection system is running, so the protection depth of the oil well casing is significantly deepened; The electrode layout method of the protection system has undergone major changes in principle and structure, which can facilitate technical transformation; in addition, this system has the characteristics of wide practicality, and can also be used in cathodic protection systems such as gas well casings, which has great advantages. social and economic benefits

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