Technical Specification: 13 5/8" Casing / TN 95HS Grade
The 13 5/8" casing pipe with Tenaris TN 95HS grade represents one of the most advanced and specialized products in the oil and gas industry for demanding drilling applications. This product uniquely combines high collapse resistance with exceptional performance in sour (H2S) environments, making it the ideal choice for deep, high-pressure wells
:Technical Analysis of TN 95HS Grade
The TN 95HS grade is a Tenaris proprietary product classified under High Collapse & Sour Service category . This grade combines two critical performance characteristics
:High Collapse Resistance (HC)
At significant depths, casing strings face enormous hydrostatic pressure from drilling fluid columns and formation pressures. The TN 95HS grade, through precise metallurgical control and heat treatment, delivers superior collapse resistance compared to standard API grades with similar yield strength
:Sour Service Resistance (SS)
In environments containing hydrogen sulfide (H2S), Sulfide Stress Cracking (SSC) represents one of the most critical failure mechanisms. The TN 95HS grade, with its specific chemical design, controlled microstructure, and precise mechanical properties, offers exceptional resistance to this phenomenon
Tenaris maintains strict process control from steelmaking through rolling and heat treatment to achieve the optimal balance of strength and toughness
:API 5CT - PSL2 Analysis
Product Specification Level 2 (PSL2) indicates the highest level of quality requirements, including
Stricter chemical composition control with tighter limits on detrimental elements
100% non-destructive testing for surface and internal defect detection
Impact testing at specified temperatures to ensure toughness
Tighter dimensional tolerances
Complete Mill Test Certificates (MTC) documenting all test results
:Plain End Specification
Plain End designation indicates the pipe is supplied without any pre-cut threads. This offers several advantages
:Connection flexibility
Allows installation of various premium connections (e.g., Tenaris Hydril Wedge or Blue®) based on project requirements
:Reduced inventory costs
Threading can be performed to match specific length requirements
:Enhanced connection integrity
Enables custom, high-quality connection execution
Operational Applications
This product is specifically suited for
:Deep and Ultra-Deep Wells
Where high hydrostatic pressures are encountered
:Sour Service Wells
Containing hydrogen sulfide (H2S)
High Pressure, High Temperature (HPHT) Wells: Combining extreme pressure and temperature
:Geologically Complex Formations
Requiring high collapse strength
Intermediate and Production Casing Sections
:Supplementary Technical Notes
The 88.2 ppf weight for 13 5/8" size provides optimal wall thickness and is one of the most commonly specified weights for this size in the industry
The R3 length range, with maximum length of approximately 40 feet, minimizes the number of connections per string and reduces leak risks significantly