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Tchnology of internal for tubing of drilling well

A technology of inner coating and pipe, which is applied in the direction of drill pipe, drilling equipment, drill pipe, etc., can solve the problems of short service life and narrow application range, improve corrosion resistance and wear resistance, reduce floor space, expand The effect of application range

Active Publication Date: 2005-01-05
SHANGHAI TUBE COTE PETROLEUM PIPE COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention overcomes the defects of relatively narrow pipe use range and short service life in the original pipe inner coating process, and provides an inner coating process for drilling pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0014] An inner coating process of pipes for drilling, including thread cleaning, heat cleaning and surface sandblasting of the pipes in the early stage, characterized in that the inner coating process of pipes for drilling is operated according to the following steps:

[0015] (1) Spray the pre-treated pipe with epoxy phenolic resin coating TC2000 series, and then bake it. The baking temperature is 120-150°C and the baking time is 50-70 minutes;

[0016] (2) After the pipe is cooled, it is sprayed with epoxy phenolic resin coating TC2000 series, and then baked. The baking temperature is 120-150 ° C, and the baking time is 50-70 minutes;

[0017] (3) Curing treatment: put the pipe into a continuous furnace for curing treatment, the curing temperature is 200-240° C., and the curing time is 60 minutes.

[0018] There is a partition wall between the surface sandblasting treatment area of ​​the pipe in the early stage and the primer spraying area. The partition wall is a wall with...

Embodiment 1

[0020] Example 1: The pipe is a 5-inch drill pipe, the primer baking temperature is 140°C, the baking time is 60 minutes, the topcoat baking temperature is 140°C, the baking time is 60 minutes, the curing temperature is 240°C, and the curing time is 60 minutes. The time is 60 minutes, and the implementation effect: through performance testing, the coating quality is considered to be in full compliance with the indicators in the petroleum industry standard SY / T0544-1995; the application effect is good in various domestic oil fields, and the drilling depth exceeds 6000 meters.

Embodiment 2

[0021] Example 2: The pipe is a 3.5-inch oil pipe, the primer baking temperature is 130°C, the baking time is 50 minutes, the topcoat baking temperature is 130°C, the baking time is 50 minutes, the curing temperature is 220°C, the curing time It takes 60 minutes to implement the effect: through performance testing, the quality of the coating is considered to be in full compliance with the indicators in the petroleum industry standard SY / TO544-1995; the application effect is good in various domestic oil fields, and the coating is tested in different corrosive media and the temperature is as high as 150 ℃ Oil production wells and water injection wells have been used for a long time, and the coating has not been damaged.

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PUM

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Abstract

The invention relates to inner coating process for drilling pipes. The process includes preceding threaded rinsing, heat eliminating and sand-spraying process to surface; the process is operated according to following steps: 1. the preceding processed pipe uses epoxy phenol resin paint TC2000 series to spray primer, then carries on bake to it, the temperature is 120-150deg.C, the time is 50-70 minutes; 2. uses epoxy phenol resin paint TC2000 series to carry on finishing coat to the pipe after the pipe is cooled, then carries on bake, the baking temperature is 120-150deg.C, the time is 50-70 minutes; 3. solidification process, the pipe is put into the continuous furnace to be solidified, the solidification temperature is 200-240deg.C, the time is 60 minutes. The invention simplifies the painting device, and it increases the corrosion and friction resisting performance.

Description

technical field [0001] The invention relates to an inner coating process of a pipe, in particular to an inner coating process of a pipe used for drilling. Background technique [0002] At present, in the process of exploration and production of oil and natural gas, due to the complex geological structure and ever-changing underground environment, some downhole environments are very harsh. Therefore, the operating environment (including temperature, pressure and well depth, etc.) ) for specific analysis so that the pipes used can meet the needs of exploration and production. In this regard, the construction drilling industry must use special pipes (that is, pipes with inner coatings) to meet the corresponding use requirements, and these pipes include drill pipes, oil pipes and casings. Most of the drilling pipes used in the drilling industry are pipes with a single inner coating process, which has certain restrictions on the use environment, making the use range relatively n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00
Inventor 曹育红李连宝
Owner SHANGHAI TUBE COTE PETROLEUM PIPE COATING
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