Corrosion-resistant and long-fatigue-life drill rod and preparation method thereof

A fatigue life and corrosion resistance technology, applied in drill pipe, drilling equipment, drill pipe, etc., can solve the problem of high economic cost, and achieve the effect of saving cost, good effect and improving wear resistance
CN112855036AInactive Publication Date: 2021-05-28BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2021-05-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a corrosion-resistant and long-fatigue-life drill rod and a preparation method thereof, and belongs to the technical field of corrosion prevention of drill rods and coatings. For a stress concentration part, namely a pipe body thickening transition disappearance area, of a drill rod frequent failure area, outer coating corrosion prevention of a specific material is conducted on a specific area section, so that breakthrough is made in the aspects of improving the abrasion resistance, fatigue resistance, corrosion resistance and the like of the drill rod, and the purpose of preventing the drill rod pipe body thickening transition disappearance area from losing efficacy in advance is achieved; the corrosion and fatigue failure problems of the most common position of an existing drill rod is solved, and the service fatigue life of the drill rod is prolonged; and a specific area is designed at the stress concentration part instead of the outer surface of the whole drill rod, the cost is saved, and a composite coating is made of a nano composite heavy rust-proof anti-corrosion coating, so that the composite coating is super-strong in anti-corrosion performance, good in effect, low in cost and convenient for large-scale popularization and application in oil field production.
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Description

technical field

[0001] The invention belongs to the technical field of drill pipe and coating anticorrosion, and relates to a drill pipe with corrosion resistance and high fatigue life and a preparation method thereof. Background technique

[0002] Oil drill pipe is the main drilling tool used to transmit power and transport drilling fluid. In the process of rotary drilling, the drill pipe is usually under the working conditions of tension, pressure inside and outside drilling, bending moment, torque, various impact loads and frictional collision with the well wall. The thickened transition disappearance zone of the drill pipe body is the stiffness change point between the large-wall-thick drill-pipe joint with high rigidity and the small-wall-thick pipe body with low rigidity, and is also the weak position in the entire drill pipe structure. It has been used in the field for many years Practice and theoretical analysis have proved that this is the most common location for ...

Claims

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