China Factory Suppliers of API 5CT J55/K55 BTC Seamless Steel Casing Pipe for Oil Wells
Detailed Description of Casing Pipe
Casing, the primary structural support and stability for a wellbore, performs the following functions: 1) stabilizing the wellbore, 2) protecting unconfined water sands from contamination, 3) isolating undesirable water from producing formations, and 4) controlling and restricting 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.
- Stabilizes the Wellbore
- Protects Water Sands from Contamination
- Isolates Undesirable Water Zones
- Controls Well Pressures
- High Collapse & Burst Pressure Resistance
- High Tensile Load Capacity
Key Parameters for OCTG Casing Pipe
| 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 4.88–7.62 m R2 7.62–10.36 m R3 10.36–14.63 m |
| 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
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Q What is the primary function of casing pipe in oil and gas wells?Casing pipe provides the primary structural support and stability for a wellbore. Its key functions include stabilizing the wellbore, protecting unconfined water sands from contamination, isolating undesirable water zones from producing formations, and controlling well pressures during drilling, production, and workover operations.
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Q What are the different types of casing strings used in a wellbore?A wellbore typically uses multiple casing strings, each with a specific purpose. These include the Conductor Casing, Surface Casing, Intermediate Casing, and Production Casing. Each string is smaller in diameter than the previous one and is cemented securely in place to ensure well integrity and safety.
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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. Each grade is selected based on the specific mechanical requirements, well depth, and environmental conditions of the application.
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Q What thread connection types are available for casing pipes?Casing pipes are available with several thread connection options, including STC (Short Thread Coupling), LTC (Long Thread Coupling), and BTC (Buttress Thread Coupling). Premium and gas-tight connections such as VAM and TenarisHydril are also available for applications requiring enhanced sealing performance.
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Q What quality inspection processes are applied to casing pipes?All casing pipes undergo rigorous quality inspection procedures, including Hydrostatic Testing, Non-Destructive Testing (NDT) methods such as Ultrasonic Testing (UT), Magnetic Particle Inspection (MT), and Electromagnetic Inspection (EMI), as well as Dimensional Inspection and Thread Inspection to ensure full compliance with API SPEC 5CT and ISO 11960 standards.
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Q What standard lengths are available for OCTG casing pipes?OCTG casing pipes are supplied 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 the specific requirements of the well design and operational logistics.