Bidirectional protecting oil pump plunger and hot spray processing technique for surface of same

Abstract

The invention relates to a bidirectional protecting oil pump plunger and a hot spray processing technique for the surface of the same. The protecting oil pump plunger comprises a long cylinder, wherein two ends of the cylinder are provided with external threads and connected with a valve cover; and the surface of the plunger is sprayed with a layer of corrosion-resistant and wear-resistant AOC alloy coating. The processing technique comprises the following steps: carrying out surface oil removal treatment on a plunger blank; burnishing and roughening the plunger blank; preheating the plunger blank for surface activation; pre-spraying alloy powder to protect the surface of the plunger from contacting air indirectly; continuously spraying till the ultimate thickness of the coating reaches 0.4 mm; heating the plunger blank after spraying for remelting of the alloy coating; and finally burnishing and polishing the plunger blank to prepare the bidirectional protecting oil pump plunger with the coating of which the thickness is more than 0.25 mm. The processing technique has simple and convenient operation, the coating is combined closely after spraying; the performance of a basal body of the plunger is not influenced during coating; and the thickness of the coating is more than 0.25 mm, and the coating can resist outside wearing and corrosion, and reduce the wearing to the inner surface of a pump cylinder of an oil well pump.

Description

technical field [0001] The invention relates to a two-way protection oil well pump plunger and a thermal spraying process on the surface of the plunger, which belongs to the field of petroleum equipment processing. Background technique [0002] Rod pump oil production of pumping unit is an artificial lifting oil production method, which is widely used in major oil fields at home and abroad for its advantages of simple equipment, low investment, convenient management and strong adaptability. The performance of rod pump oil extraction equipment plays a decisive role in the field of oil extraction. The oil well pump is an important part of it. It is lowered into the well through the oil pipe and the sucker rod and submerged at a certain depth below the liquid surface, and the oil is discharged from the ground by pumping. The oil pump is mainly composed of pump barrel, plunger, oil inlet valve and oil outlet valve. During the upstroke, the volume of the lower pump chamber belo...

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Problems solved by technology

[0005] Although the chemical plating and other coatings on the surface of the plunger of the oil well pump in the past slow down the wear of the plunger to a certain extent and improve the corrosion resistance of the plunger, due to the increase of its own surface hardness, it will inevitably cause damage to the inside of the pump barrel. Increased surface wear reduces the normal service life of the pump barrel

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