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CN-122013088-A - Corrosion prevention treatment method for continuous oil pipe joint

CN122013088ACN 122013088 ACN122013088 ACN 122013088ACN-122013088-A

Abstract

The invention discloses an anti-corrosion treatment method for a continuous oil pipe joint, which comprises the following steps of S1, screening powdery nickel-based alloy raw materials through a powder sieve to obtain nickel-based alloy powder, S2, polishing the surface of the continuous oil pipe joint, carrying out surface roughening treatment on the continuous oil pipe joint, S3, preheating the continuous oil pipe joint, spraying the nickel-based alloy powder onto the preheated continuous oil pipe joint to form a nickel-based alloy coating, S4, carrying out heat treatment on the nickel-based alloy coating, S5, smearing a hole sealing agent on the surface of the nickel-based alloy coating, dipping the nickel-based alloy coating, carrying out curing treatment on the nickel-based alloy coating, and polishing the nickel-based alloy coating until the surface of the continuous oil pipe joint is restored to be flat, thereby completing the anti-corrosion treatment on the continuous oil pipe joint. The anti-corrosion treatment method for the continuous oil pipe joint solves the problems that the continuous oil pipe joint is easy to corrode and overload in a severe operation environment, and then breaks and fails.

Inventors

  • WANG HAOZHEN
  • WANG WEILIANG
  • LIU ZHE
  • Qi Suixiang
  • ZANG WEI
  • YUAN QINGYING
  • WANG HAITAO
  • LI HONGBIN
  • XIAN LINYUN
  • WANG WEIDONG
  • ZHAO BO

Assignees

  • 中油国家石油天然气管材工程技术研究中心有限公司
  • 中国石油天然气集团有限公司
  • 中国石油集团宝石管业有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. The anti-corrosion treatment method for the continuous oil pipe joint is characterized by comprising the following steps of: s1, sieving powdery nickel-base alloy raw materials through a powder sieve to obtain nickel-base alloy powder, and carrying out heat preservation treatment on the nickel-base alloy powder at 80 ℃ for 24 hours; s2, polishing the surface of the joint of the continuous oil pipe, and carrying out surface roughening treatment on the joint of the continuous oil pipe; S3, preheating the joint of the continuous oil pipe to 100-150 ℃, spraying nickel-based alloy powder onto the preheated joint of the continuous oil pipe, and forming a nickel-based alloy coating on the surface of the joint of the continuous oil pipe; s4, carrying out heat treatment on the nickel-based alloy coating; And S5, smearing the hole sealing agent on the surface of the nickel-based alloy coating, dipping the nickel-based alloy coating, curing the nickel-based alloy coating, and polishing the nickel-based alloy coating until the surface of the joint of the continuous oil pipe is restored to be flat, thereby finishing the anti-corrosion treatment of the joint of the continuous oil pipe.
  2. 2. The method for corrosion protection treatment of a coiled tubing joint according to claim 1, wherein the nickel-based alloy raw material in S1 comprises ：Ni:55~60%、Cr:19~24%、Mo:5~8%、Nb:4.5~5.2%、Ti:0.8~1.15%、Al:0.4~0.8%、C≤0.05%、Cu≤0.3%、Co≤1%、Mn≤0.35%、Si≤0.35%、P≤0.01%、S≤0.01%、% by mass of the balance Fe, and the sum of the mass percentages of the components is 100%.
  3. 3. The method for corrosion protection of coiled tubing joints according to claim 1, wherein the particle size of the nickel-based alloy powder in S1 is 15-75 μm.
  4. 4. The method for corrosion protection treatment of coiled tubing joints according to claim 1, wherein the specific steps of S2 are: S2.1, polishing a groove with the length of 200mm and the depth of 300 mu m on the joint of the continuous oil pipe for one circle, and polishing two ends of the groove into 15-degree chamfers; and S2.2, scrubbing the polished continuous oil pipe joint by using acetone and alcohol, and performing scanning type sand blasting on the continuous oil pipe joint twice by adopting suction type sand blasting equipment to finish the surface roughening treatment of the continuous oil pipe joint.
  5. 5. The method for corrosion protection at a joint of coiled tubing according to claim 4, wherein the abrasive used for blasting in S2.2 is brown alumina with a particle size ranging from 500 μm to 800 μm, a pressure ranging from 0.7 mpa to 0.8mpa, a blasting angle ranging from 75 degrees to 90 degrees, and a blasting distance ranging from 100 mm to 150mm.
  6. 6. The method for corrosion prevention of a continuous oil pipe joint according to claim 5, wherein the surface roughness of the continuous oil pipe joint after finishing the surface roughening treatment is 2.5-5 μm.
  7. 7. The method for corrosion prevention treatment of a continuous oil pipe joint according to claim 1, wherein the preheating mode in S3 is that a plasma flame flow is adopted to sweep the continuous oil pipe joint twice, the spraying mode in S3 is that a supersonic plasma spraying device is adopted, the spraying voltage of the supersonic plasma spraying device is 110-130V, the spraying current is 420-450A, the powder feeding gas is dry Ar, the Ar gas flow is 160-180 l.min-1, the H2 gas flow is 6-9 l.min-1, the powder feeding gas pressure is 0.35-0.5MPa, the powder feeding gas flow is 12-15L/min, the powder feeding rate is 10-15g/min, and the spraying distance is 100-150mm.
  8. 8. The method for corrosion protection of a coiled tubing joint according to claim 1, wherein the thickness of the nickel-based alloy coating in S3 is 300-330 μm.
  9. 9. The method for corrosion protection at a coiled tubing connection according to claim 1, wherein the heat treatment in S4 comprises a solution heat treatment and an aging heat treatment; The temperature of the solution heat treatment is set at 980-1030 ℃, the heat preservation time is 30-60 minutes, then water cooling is carried out to room temperature, the temperature of the aging heat treatment is set at 680-760 ℃, the setting time is 6-8 hours, and then air cooling is carried out to room temperature.
  10. 10. The method for corrosion protection of a coiled tubing joint according to claim 1, wherein the sealer in S5 is one of an aluminum phosphate sealer, an aluminum dihydrogen phosphate sealer, an epoxy sealer, or a silicone sealer.

Description

Corrosion prevention treatment method for continuous oil pipe joint Technical Field The invention belongs to the technical field of petroleum and natural gas pipelines, and particularly relates to an anti-corrosion treatment method for a continuous oil pipe joint. Background With the continuous development of world oil and gas technology, the coiled tubing and the operation tool thereof are widely applied to the fields of well repair, well logging, well drilling and the like, and become a technical tool for reducing the cost and enhancing the efficiency of oil and gas exploration and development. Currently, high-mineralization, high-pressure, deep and H 2S、CO2 -containing corrosive medium oil and gas reservoirs in China are developed in large quantities. The construction process of various continuous oil pipes needs to use the downhole tools matched with the continuous oil pipes, and the continuous oil pipes are connected with the downhole tools usually in a slip and welding mode. In addition, to solve the length problem of the current coiled tubing, two coiled tubing are typically connected by welding. However, the current connection mode inevitably becomes the area with the weakest performance due to the problems of uneven structure, stress concentration, slag inclusion and the like. When the continuous oil pipe is in service in a severe environment, corrosion and overload are easy to occur, so that cracks, thorns and leaks occur at the joint of the continuous oil pipe, even fracture and failure occur, and serious economic loss is caused. Disclosure of Invention The invention aims to provide an anti-corrosion treatment method for a continuous oil pipe joint, which solves the problems of easy corrosion and overload and further fracture failure of the continuous oil pipe joint in a severe operation environment. The technical scheme adopted by the invention is that the anti-corrosion treatment method for the joint of the continuous oil pipe comprises the following steps: s1, sieving powdery nickel-base alloy raw materials through a powder sieve to obtain nickel-base alloy powder, and carrying out heat preservation treatment on the nickel-base alloy powder at 80 ℃ for 24 hours; s2, polishing the surface of the joint of the continuous oil pipe, and carrying out surface roughening treatment on the joint of the continuous oil pipe; S3, preheating the joint of the continuous oil pipe to 100-150 ℃, spraying nickel-based alloy powder onto the preheated joint of the continuous oil pipe, and forming a nickel-based alloy coating on the surface of the joint of the continuous oil pipe; s4, carrying out heat treatment on the nickel-based alloy coating; And S5, smearing the hole sealing agent on the surface of the nickel-based alloy coating, dipping the nickel-based alloy coating, curing the nickel-based alloy coating, and polishing the nickel-based alloy coating until the surface of the joint of the continuous oil pipe is restored to be flat, thereby finishing the anti-corrosion treatment of the joint of the continuous oil pipe. The invention is also characterized in that: the nickel-based alloy raw material in S1 comprises ：Ni:55~60%、Cr:19~24%、Mo:5~8%、Nb:4.5~5.2%、Ti:0.8~1.15%、Al:0.4~0.8%、C≤0.05%、Cu≤0.3%、Co≤1%、Mn≤0.35%、Si≤0.35%、P≤0.01%、S≤0.01%、 parts by mass of Fe and the balance of Fe, wherein the sum of the parts by mass is 100%. The particle size of the nickel-base alloy powder in S1 is 15-75 mu m. The specific steps of S2 are as follows: S2.1, polishing a groove with the length of 200mm and the depth of 300 mu m on the joint of the continuous oil pipe for one circle, and polishing two ends of the groove into 15-degree chamfers; S2.2, scrubbing the polished continuous oil pipe joint by using acetone and alcohol, and performing scanning sand blasting on the continuous oil pipe joint twice by adopting suction-jet sand blasting equipment to finish surface roughening treatment on the continuous oil pipe joint; and S2.2, wherein the abrasive adopted in the sand blasting is brown corundum with the particle size range of 500-800 mu m, the pressure range of 0.7-0.8 MPa, the sand blasting angle of 75-90 degrees and the sand blasting distance of 100-150 mm. The roughness of the surface of the joint of the continuous oil pipe is 2.5-5 mu m. The preheating mode in S3 is that plasma flame flow is adopted to sweep the joint of the continuous oil pipe twice, the spraying mode in S3 adopts supersonic plasma spraying equipment, the spraying voltage of the supersonic plasma spraying equipment is 110-130V, the spraying current is 420-450A, powder feeding gas is dry Ar, ar gas flow is 160-180 L.min-1, H2 gas flow is 6-9 L.min-1, powder feeding gas pressure is 0.35-0.5MPa, powder feeding gas flow is 12-15L/min, powder feeding rate is 10-15g/min, and spraying distance is 100-150mm. And S3, the thickness of the nickel-based alloy coating is 300-330 mu m. S4, heat treatment comprises solution heat treatment and aging heat treatment; the temp