H2S corrosion resistance premium connection casing is seal lock joint casing used for oil and gas exploitation under H2S corrosion condition. Pipe body is produced with Cr-Mo steel billet that can resist H2S stress corrosion and the component of billet is on our Changbao’s self research. Such Cr-Mo steel billet has high hardenability and tempering stability, so when tempered under specific temperature, small and uniform tempered sorbite can be obtained. And through fine adjustment of the composition and heat treatment, hardness and strength can fully meet corresponding requirement for different steel grade. It also helps improve SSC resistance performance. Changbao’s such tubing and casing with special patent gas-sealing connection joint, , applies to different complex and serious well condition. Now, Changbao’s H2S corrosion resistance premium connection casing has been approved by domestic authority and widely used in domestic oil fields. And our CBS3 premium connection, applies to H2S corrosion resistance tubing and casing, has passed CAL-IV test qualification, which is the highest level required by ISO 13679.
1 Changbao’s regular H2S corrosion resistance steel grade
CB80S、CB80SS、C90、CB90S、CB90SS、T95、CB95S 、CB95SS、C110、CB110S、CB110SS
anti-H2S level—“S” means common H2S corrosion resistance level
“SS” means common high H2S corrosion resistance level
2 Changbao’s Seal lock premium connection that can apply to H2S corrosion resistance premium connection tubing and casing
CBS1:Changbao’s Seal lock premium connection one(tubing and casing)
CBS2:Changbao’s Seal lock premium connection two(tubing and casing)
CBS3:Changbao’s Seal lock premium connection three(tubing and casing)
CB-FJ: Changbao’s flush joint Seal lock premium connection(tubing and casing)
CB-EU-HT/CB-BCS-HT :high torque opposite vertex premium connection(tubing and casing)
3 Standard
API Spec 5CT
ANSI/NACE MR0175/ISO 15156
Mechnical and Chemical property：
Steel grade | Item | Yield Strength MPa | Tensile strength MPa | Elongation | Impact Strength | Hardness maximum | Application scope （PH2S） | |
MPa | ||||||||
min | max | min | HRC | |||||
80 | CB80S | 552 | 655 | 655 | Calculated as per API 5CT | As API 5CT L80 required | 23 | 0.34KPa-100KPa |
CB80SS | PH2S>100KPa | |||||||
90 | C90 | 621 | 724 | 689 | AS API 5CT C90 required | 25.4 | ≥0.34KPa | |
CB90S | 0.34KPa-100KPa | |||||||
CB90SS | >100KPa | |||||||
95 | T95 | 655 | 758 | 724 | As API 5CT T95 required | 25.4 | ≥0.34KPa | |
CB95S | 0.34KPa-100KPa | |||||||
CB95SS | PH2S>100KPa | |||||||
110 | CB110S | 758 | 862 | 793 | As API 5CT C110 required | 30 | ≥0.34KPa | |
0.34KPa-100KPa | ||||||||
CB110SS | PH2S>100KPa | |||||||
C110 | 758 | 828 | 793 | |||||
Corrosion property
Steel grade | Corrosion property requirement | |
H2S stress corrosion test（SSC） | ||
As NACE TM 0177 A way A liquor，without cracking in 720 hours | ||
ф6.35 sample | ф3.81 sample | |
Upload SYMS number | ||
C90 T95 CB110S | 80% | 72% |
CB80S CB90S CB95S C110 | 85% | 76% |
CB80SS CB90SS CB95SS | 90% | 80% |
C90 T95（PSL-2） | 90% | 80% |
Joint performance
Type of joint | Resistance to internal pressure and collapse | Tensile efficiency | Compression efficiency | Well condition |
CBS1 | Equal to pipe body | 100% of pipe body | Tubing: 100%of pipe body Casing: 60%of pipe body | A little hard well condition, shallow well, medium-depth well |
CBS2 | 100% of pipe body | Tubing: 100%of pipe body Casing: 60%of pipe body | Hard well condition, medium-depth/deep well, etc | |
CBS3 | 100% of pipe body | Tubing: 100%of pipe body Casing: 60%of pipe body | extreme well condition, deep well, extra deep well, horizontal well, etc | |
CBS3-HTC | 100% of pipe body | 100% of pipe body | ||
CB-FJ | 45%~66% of pipe body | 45%~66% of pipe body | Repair well、 exhaust nozzle etc | |
CB-EU-HT/CB-BCS-HT | Equal to API EU/BC Property | Ordinary wells | ||
Range
OD：Φ33.4mm~Φ219.08mm；WH：3.18mm~22.2mm
