Processing method for preventing connection thread gluing of titanium alloy oil well pipe

A processing method and technology for oil well pipes, which are applied in the direction of engine lubrication, mechanical equipment, engine components, etc., can solve the problems of fretting wear, adhesive wear, and reduce the yield of pipes, so as to improve hardness and wear resistance, and reduce friction. coefficient, the effect of saving processing costs

Inactive Publication Date: 2014-01-22
XIAN SANHUAN TECH DEV GENERAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the low density of titanium alloy will make the material cost of titanium alloy tubing per unit length lower than that of nickel-based alloys. At the same time, titanium alloy pipe processing technology has made rapid progress in the past 20 years. In addition, the strength of titanium alloy through rolling or heat treatment is just It can reach 120ksi, while the nickel-based alloy pipe needs to be hardened by cold work to reach the strength level of 120ksi. During the cold deformation process, cracks and other defects are easy to occur, which will further reduce the yield of the pipe.
[0004] But the fly in the ointment is that the surface hardness of titanium alloy is low, the wear resistance is poor, and the thermal conductivity is poor. When titanium alloy is in contact with titanium alloy or other metals, it is prone to adhesive wear and fretting wear, so that the titanium alloy pipes connected by threads , the thread is prone to bite and sticking during the make-up and break-out process, which destroys the structural integrity and sealing integrity of the pipe string

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The external thread of Φ73mm tubing and the internal thread of the coupling made of TC4 alloy are respectively shot blasted and pre-plated with nickel / copper.

[0026] First, the internal thread contains 40g / L NaOH, 30g / L Na 2 CO 3 , 25g / L Na 3 PO 4 Degreasing in the solution, the solution temperature is about 80 ℃, time 8min. Afterwards, the etching treatment is carried out, and the ratio of the etching solution is 100ml / L with a volume concentration of 65% HNO 3 , 20ml / L volume concentration 40%HF, 15ml / L H 2 O 2 , Processing time 3min. After the acid etching is completed, the threaded part of the workpiece is cleaned with distilled water. After activation treatment, the density of the activation solution is 1.19g / cm 3 , 130ml / L hydrochloric acid, 40g / L Utropine composition, time 10min. After pre-plating nickel, the plating solution is as follows: 16g / L nickel sulfate, 15g / L sodium hypophosphite, 10g / L sodium acetate, 1ml / L propionic acid. The pH value of the plating s...

Embodiment 2

[0031] The outer thread of the casing and the inner thread of the coupling with Φ139.7mm made of TA18 alloy are respectively shot peened and pre-plated with nickel / copper.

[0032] First, the internal thread contains 35g / L NaOH, 30g / L Na 2 CO 3 , 30g / L Na 3 PO 4 Degreasing in the solution, the solution temperature is about 90 ℃, time 6min. Afterwards, the etching treatment is carried out. The etching solution is made of 100ml / L HNO with a volume concentration of 65% 3 , 20ml / L volume concentration of 40% HF, 15ml / L H 2 O 2 Composition, processing time 3min. After the acid etching is completed, the threaded part of the workpiece is cleaned with distilled water. After activation treatment, the density of the activation solution is 1.19g / cm 3 , 120ml / L hydrochloric acid, 45g / L Utropine composition, time 6min. After that, nickel is pre-plated, and the plating solution is as follows: 20g / L nickel sulfate, 19g / L sodium hypophosphite, 15g / L sodium acetate, 3ml / L propionic acid. The pH...

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Abstract

The invention relates to a processing method for preventing connection thread gluing of a titanium alloy oil well pipe. A shot blasting process is used for processing a connection external thread, and the hardness and the abrasive resistance of the surface of the connection external thread are improved. Meanwhile, a nickel/copper preplating process is used for a connection internal thread, a layer of copper film which is well combined with a titanium alloy matrix is electroplated on the surface of the connection internal thread, the hardness and the abrasive resistance of the surface of the connection internal thread are improved, and a friction condition is improved. Moreover, graphite is used for lubricating the internal thread and the external thread, and the friction coefficient between the surface of the internal thread and the surface of the external thread is effectively lowered. The method can effectively solve the problem of the connection thread gluing of the titanium alloy oil well pipe.

Description

Technical field [0001] The invention relates to a method for processing the thread of a titanium alloy oil well pipe joint used in the field of petroleum and natural gas production, so as to prevent the thread from sticking during use. This treatment method is suitable for API threads and non-API threads. Background technique [0002] Titanium alloy is an important structural metal material that emerged in the 1950s. Compared with other structural metal materials, titanium alloy has two significant advantages: high specific strength and excellent corrosion resistance. First, the density of titanium is 4.51g / cm 3 , Only 57% of steel, but its yield strength exceeds many alloy structural steels. In addition, compared with other metal structural materials, titanium alloys have higher high-temperature strength. Common structural titanium alloys still have sufficient strength when used below 400°C, and their high-temperature strength is significantly better than stainless steel and he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16N15/02C25D5/12C25D5/38C22F1/18
Inventor 李德君刘强宋生印白强冯耀荣贾鹏军
Owner XIAN SANHUAN TECH DEV GENERAL
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