Preparation method of anti-mud wear-resistant modified layer on the surface of drill bit steel body

Abstract

The invention discloses a preparation method of a drill bit steel body surface mud-sticking-resistant and abrasion-resistant modified layer. The method comprises the following steps that (1) alloy steel is ground and subjected to sandblasting pretreatment; (2) a supersonic flame spraying system is adopted for spraying; (3) SiC sandpaper grinding, polishing and cleaning are conducted; (4) a laser is used for texture preparation; and (5) polishing, ultrasonic cleaning and drying are conducted, that is, the surface mud-sticking-resistant and abrasion-resistant modified layer is prepared on the surface of the alloy steel. The preparation method is simple and easy to implement, and the prepared modified layer has the advantages of high hardness, low porosity and decarburization rate, excellentabrasion resistance and the like, and is suitable for strengthening a drill bit steel body, so that the abrasion resistance of the drill bit steel body is improved. Through the laser surface texture technology, environment pollution is avoided, manufacturing is easy, the form is controllable, the mud-sticking resistance of the coating surface can be improved, and improvement of the abrasion resistance is assisted to a certain extent. The mud-sticking resistance and friction abrasion property of the obtained composite reinforcing layer are improved.

Description

technical field [0001] The invention belongs to the technical field of drilling bits, and in particular relates to a method for preparing a mud-packing and wear-resistant modified layer on the surface of a steel body of a drill bit. Background technique [0002] 1.1 Research Status and Existing Problems [0003] With the rapid development of the industrial economy, the global demand for oil and gas resources has also increased sharply. However, due to the fact that the discovery of conventional oil and gas fields has decreased year by year and the difficulty of exploitation has gradually increased, it is very important for mud shale oil and gas, coalbed methane and natural gas hydrate. The demand for the development of conventional oil and gas resources is becoming increasingly urgent. my country's shale oil and gas resources are quite rich, and it is an important field for future oil and gas exploration and exploitation. However, due to the special characteristics of shal...

AI Technical Summary

Problems solved by technology

(2) Drill bit structure factors: unreasonable design of the hydraulic structure of the drill bit will directly affect the cleaning effect of the bottom hole and the smooth discharge of cuttings; unreasonable design of the flow channel of the drill bit will not ensure the smooth removal of cuttings from the bottom of the well

(3) Drilling fluid factors: If the drilling fluid has weak inhibition, it cannot effectively inhibit the hydration expansion of mud shale in the formation; if the drilling fluid has poor lubricating performance, it cannot form an effective protective film on the surface of the drill bit, resulting in The poor quality solid phase is easily adsorbed on the drill bit

But its anti-mud bag performance needs to be improved

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