What do you know about oil casing maintenance?

The technical service of oil Casing overhaul is one of the most important links in the technical service of oil and gas field engineering inspection. How much do you know about this technology? Learn from Xiaobian together!

What is oil CASING maintenance technology
Oil and casing maintenance technical services mainly follow API and special thread standards, and carry out the whole process maintenance services of new and old oil and casing and sucker rod, such as cleaning, non-destructive testing, thread repair processing, thread blasting, pipe end reducing, hydrostatic test, spray painting, label spraying, etc. Repair the old, recycle the old, help customers to maximize the cost of production.

Industry standard for inspection and repair of petroleum casing
API Specification 5CT(10th edition)
API Specification 5B (16)
API Specification Q1(Phase 9)
API Specification Q2(Phase 2)
Q/SY TZ 0267-2015 Api Tubing repair
Q/SY TZ 0439-2015 Technical requirements for oil field gathering and transportation pipeline maintenance
Q/SY TZ 0474-2016 "13Cr Special Threaded Joint TUBING Repair Technical Regulations"
Standard test methods and definitions for mechanical properties of steel products
Ultrasonic test methods for metallic tubes
Test method for magnetic flux leakage of ferromagnetic steel tube products
ASTM E709-21 Standard Guide for Testing Magnetic Particles
SY/T 5991-2016 Thread protectors for casing, Tubing and conveying steel pipes
Petroleum and natural gas industry -- Steel tubes for casing of oil and gas Wells

Oil casing maintenance Tips
API ordinary thread and special (sealed) thread difference:
·API thread is sealed with triangular thread surface, without forming sealing surface and shoulder surface, low production and maintenance cost, fast coupling loading and unloading speed, and average sealing performance. It is often used in oil well production operations and well conditions without air tightness requirements.
· Special (sealed) threads have their own shoulder surface and sealing surface. Threads are used only for storing thread grease and connections. The sealing surface on the pipe external thread and the coupling internal thread joint is squeezed and slightly deformed to seal. Good sealing performance, reliable connection, but high production and maintenance costs. It is often used in the production of gas Wells, oil and gas mixtures and Wells requiring gas tightness.