Oil well casing cathodic protection system and electrode layout method based on pulse current

Abstract

The cathodic protection system for oil well casing based on pulse current includes a pulse power supply respectively connected to the oil well casing and the anode well system; a soil medium is provided between the oil well casing and the anode well system; the location method includes the following steps: 1) Determine the well location of the anode well according to the data; 2) Determine the well depth of the anode well; 3) Determine the connection method of the anode cable; 4) Determine the connection method of the cathode cable; On the top, split-point binding; the potential measuring instrument is respectively connected to the reference electrode and the cathode to monitor the protection potential in real time. Through the feedback data of the potential measuring instrument, the pulse power automatic adjustment system can adjust the protection potential in real time, so that the oil well casing is always in the effective protection range; it has protection current transmission, high anode utilization, high efficiency, wide application range, and long service life of the anode , easy maintenance, and extended protection depth.

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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