Device for preventing corrosion through impressed current method for oil pumping well

Abstract

The invention relates to a corrosion prevention device on an oil pumping well of an oil field, in particular to a device for preventing corrosion through an impressed current method for an oil pumping well. The device comprises a beam hanger, a sucker rod string, an oil outlet pipeline, an oil pipe, a sleeve, an oil well pump and a direct-current power source; the sleeve is mounted in a wellbore; the oil well pump is mounted on the oil pipe, then the oil pipe with the oil well pump is put in the sleeve, and the upper portion of the oil pipe is in insulated connection with the sleeve; the lower portion of the oil outlet pipeline is connected with the oil pipe; the sucker rod string is put in the oil pipe, and the lower portion of the sucker rod string is connected with a piston of the oil well pump; the upper portion of the sucker rod string penetrates through the oil outlet pipeline to be in insulated connection with the beam hanger; a plurality of non-conducting centering devices are mounted on the oil pipe at intervals; the negative pole of the direct-current power source is connected to the oil outlet pipeline, and the positive pole of the direct-current power source is connected to the ground; and the tail end of the oil pipe and the sleeve communicate through contacting to form a closed loop. The service lives of a sucker rod, the oil pipe, the oil well pump, the sleeve and downhole tools of the oil pumping well are prolonged, and the economic benefits of the oil well are improved.

Description

technical field [0001] The invention relates to an anti-corrosion device on an oil pumping well in an oil field, in particular to an anti-corrosion device using an applied current method for an oil pumping well. Background technique [0002] There are corrosion problems in the sucker rods, oil pipes, pumps, casings, and downhole tools of some oil pumping wells. At present, there are many measures to prevent the above corrosion, but all of them are anticorrosion for a single tool, such as patent No. 201220522703.7, a Chinese utility model patent titled "High Pressure Polyethylene Anti-corrosion Tubing", which can only be used for corrosion protection of oil pipes, but not for other tools in the well; "The Chinese invention patent is only anti-corrosion for the sucker rod, and cannot be anti-corrosion for other tools in the well; another example is the Chinese utility model patent with the patent number 201220650010.6 named "Long Tail Pipe Anti-Casing Corrosion Well Washing Pr...

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Problems solved by technology

[0002] There are corrosion problems in the sucker rods, oil pipes, pumps, casings, and downhole tools of some oil pumping wells. At present, there are many measures to prevent the above corrosion, but all of them are anticorrosion for a single tool, such as patent No. 201220522703.7, a Chinese utility model patent titled "High Pressure Polyethylene Anti-corrosion Tubing", which can only be used for corrosion protection of oil pipes, but not for other tools in the well; "The Chinese invention patent is only anti-corrosion for the sucker rod, and cannot be anti-corrosion for other tools in the well; another example is the Chinese utility model patent with the patent number 201220650010.6 named "Long Tail Pipe Anti-Casing Corrosion Well Washing Protection Device" , and it can only be used for corrosion protection of the casing, not for other tools in the well

The above anti-corrosion measures have limitations. Therefore, there are still corrosion problems in the sucker rod, tubing, pump, casing, and downhole tools of the pumping well, resulting in damage to the sucker rod, tubing, pump, casing, and downhole tools of the pumping well. Short service life, frequent workover operations, high oil production costs, and poor economic benefits

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