Zinc impregnation agent used for preparing heat diffusion zinc impregnation layer on surface of oil casing pipe screwed joint, and zinc impregnation method thereof

Abstract

The invention discloses a zinc impregnation agent used for preparing a heat diffusion zinc impregnation layer on the surface of an oil casing pipe screwed joint, and a zinc impregnation method thereof. The zinc impregnation agent comprises the components of, by mass, 40-60% of Zn powder with 250-300 meshes, 0.5-2% of Cu powder with 180-200 meshes, 0.5-1% of Ni powder with 180-200 meshes, 1-2% of activating agents, 1-3% of energizer, and the balance thinner with 180-200 meshes. The defects of surface treatment of existing oil casing pipe screwed joints can be overcome, the heat diffusion zinc impregnation layer with the stable thread gluing resisting performance is formed, and environmental pollution caused by electro-coppering and tinning alloy surface treatment technologies of high-chromesteel oil casing pipe screwed joints can be solved at the same time.

Description

technical field [0001] The invention belongs to the surface coating preparation technology of oil-casing threaded joints, in particular to a zinc-seeding agent and a zinc-seeding method for preparing a heat-diffusion zinc-seeding layer on the surface of oil-casing threaded joints. Background technique [0002] Oil and gas exploration and development must use oil and casing products. The casing is threaded to form a casing string to form an oil production channel, and the oil pipe is threaded to form a tubing string for oil production. The oil-casing joint is composed of internal thread and external thread. During use, the thread is tightened and loosened by make-up and breakout. The threaded joint is equivalent to a pair of friction pairs. When the surfaces of the internal thread and the external thread contact each other, microscopic From the point of view, the actual contact area of ​​the two contact bodies is only on a few asperities on the joint surface. Due to the high ...

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Problems solved by technology

[0008] The object of the present invention is to provide a kind of zincizing agent and zincizing method for preparing the thermal diffusion zincizing layer on the surface of threaded joints of oil and casing pipes, which can overcome the shortcomings of the existing surface treatment of threaded joints of oiling and casing pipes, and form a Diffusion galvanized layer with stable anti-sticking performance, and at the same time solves the environmental pollution caused by the surface treatment technology of electroplated copper-tin alloy for high-chrome steel oil casing threaded joints

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