Tchnology of internal for tubing of drilling well

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...