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API 5CT J55/K55 BTC Seamless Steel Casing Pipe for Oil Wells - High-Quality China Suppliers and Factory
Detailed Description of Casing Pipe
Stabilizes the wellbore and maintains structural integrity throughout drilling operations.
Protects unconfined water sands from contamination during wellbore operations.
Isolates undesirable water from producing formations to ensure clean extraction.
Controls well pressures during drilling, production, and workover operations.
Casing is installed in sections, or "strings", each subsequently smaller in diameter and cemented securely in place. Casing strings include the Conductor, Surface, Intermediate, and Production Casing, with a unique purpose for each string to help the well become robust and safe. When designing the casing, careful consideration is given to casing grade, casing size, and casing weight. This is important in consideration of expected hole conditions, acting pressures, and depth of target. Our casing pipes are designed to yield both high collapse pressures, burst pressures, and tensile loads, sufficiently protecting the performance of the well.
Key Parameters for OCTG Casing Pipe API 5CT
| Parameter | Details |
|---|---|
| Manufacturing Process | Seamless (SMLS) |
| Executive Standard | API SPEC 5CT, ISO 11960 |
| Grades | J55, K55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, T95, P110 |
| Wall Thickness | As per API 5CT standard, varies with OD and weight (lbs/ft) |
| Length | R1 (4.88–7.62m) | R2 (7.62–10.36m) | R3 (10.36–14.63m) |
| Thread Connections | STC (Short Thread), LTC (Long Thread), BTC (Buttress Thread), and various premium, gas-tight connections (e.g., VAM, TenarisHydril) |
| Inspection | Hydrostatic Test, NDT (UT, MT, EMI), Dimensional Inspection, Thread Inspection |
Frequently Asked Questions
Q
What are the main functions of casing pipe in oil and gas wells?
Casing pipe serves four primary functions: stabilizing the wellbore, protecting unconfined water sands from contamination, isolating undesirable water from producing formations, and controlling well pressures during drilling, production, and workover operations.
Q
What grades of OCTG casing pipe are available?
Our OCTG casing pipes are available in a wide range of API grades including J55, K55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, T95, and P110, covering standard to high-alloy corrosion-resistant options suitable for various downhole environments.
Q
What thread connection types are available for casing pipe?
Available thread connections include STC (Short Thread Coupling), LTC (Long Thread Coupling), and BTC (Buttress Thread Coupling) as standard API connections, as well as premium and gas-tight connections such as VAM and TenarisHydril for high-pressure or critical applications.
Q
What standard lengths are casing pipes manufactured in?
Casing pipes are manufactured in three standard API range lengths: R1 (4.88–7.62 m), R2 (7.62–10.36 m), and R3 (10.36–14.63 m). The appropriate range is selected based on wellbore design and operational requirements.
Q
What quality inspections are performed on casing pipes?
Each casing pipe undergoes a comprehensive inspection process including Hydrostatic Testing, Non-Destructive Testing (UT – Ultrasonic Testing, MT – Magnetic Particle Testing, EMI – Electromagnetic Inspection), Dimensional Inspection, and Thread Inspection, all in accordance with API SPEC 5CT and ISO 11960 standards.
Q
What types of casing strings are used in a well, and what is each one's purpose?
A typical well uses four types of casing strings: the Conductor Casing (provides initial structural support and prevents surface soil collapse), Surface Casing (protects freshwater aquifers), Intermediate Casing (isolates problematic formations and manages pressure zones), and Production Casing (provides the final conduit for hydrocarbons from the reservoir to the surface).