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

Inactive Publication Date: 2021-05-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pre-failure preventive measures proposed by domestic and foreign scholars, the entire pipe coating on the outer surface of the drill pipe, consumes a large economic cost

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A drill pipe with corrosion resistance and high fatigue life, including a rod body 5, the rod body 5 includes a pipe body 6 and a thickened area 4 connected to the pipe body 6, and the other end of the thickened area 4 passes through the welding neck 3 and the shoulder 2 in sequence A joint 1 is connected; a specific area is provided on the drill pipe, and the specific area includes the joint 1, the shoulder 2, the welding neck 3 and the thickened area 4, and also includes the distance between 0~ 700mm area segment;

[0040] A composite coating is provided on a specific area of ​​the drill pipe, and the composite coating is a nano-composite heavy anti-rust and anti-corrosion material coated on the surface of the specific area, and the particle size of the composite coating is 40-80nm.

Embodiment 2

[0042] like figure 1 and figure 2 As shown, the structure of the drill pipe of the present invention is consistent with that of the traditional drill pipe, including the joint 1, the shoulder 2, the welding neck 3 and the rod body 5, and the rod body 5 includes the thickened area 4 and the pipe body 6.

[0043] The nano-composite heavy-duty anti-rust and anti-corrosion paint is applied to a specific area on the outer surface of the drill pipe. The operation process mainly includes:

[0044] Pretreatment before coating: Phosphating treatment on the surface of the drill pipe.

[0045] Do not apply any grease or protective grease during the pretreatment process to ensure that the phosphating surface is dry and free of debris. Check the surface of the drill pipe after cleaning, and start the coating operation after confirming that the cleaning quality is qualified.

[0046] Coating: Fully shake the nano-composite heavy anti-rust and anti-corrosion material (bottled), and try t...

Embodiment 3

[0048] A method for preparing a drill pipe with corrosion resistance and high fatigue life, comprising the steps of:

[0049] 1) Phosphating pretreatment is carried out on the surface of the drill pipe;

[0050] 2) The surface of the pretreated drill pipe in step 1) is coated with a nano-composite heavy anti-rust and anti-corrosion material, and after the coating is left to stand until the surface of the drill pipe is dry, a corrosion-resistant and extrusion-resistant drill pipe is obtained.

[0051] The specific operation of the phosphating pretreatment is as follows: the drill pipe is soaked in antirust water after degreasing and rust removal, and then soaked in the phosphating solution for 28-35 minutes.

[0052] The concrete operation of step 2) is:

[0053] 21) Stir the nano-composite heavy anti-rust and anti-corrosion material evenly;

[0054] 22) Immerse the brush in the nano-composite heavy anti-rust and anti-corrosion material in step 21) for 3-7 seconds and then ta...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00E21B17/10B05D3/10B05D7/14C23C22/73
CPCE21B17/00E21B17/1085B05D7/14B05D3/102C23C22/73
Inventor 赵金兰李京川仝柯陈志昕张翔
Owner BC P INC CHINA NAT PETROLEUM CORP
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