API 5CT M65 CASING TUBING
M65 Casing Pipe
Introduction
M65 casing pipe is a type of steel pipe used in the oil and gas industry for wellbore casing applications. It is designed to provide structural integrity to the wellbore, prevent contamination of freshwater zones, and ensure a reliable conduit for oil and gas extraction. M65 is a grade within the API 5CT specification, known for its medium-strength properties and suitability for various drilling environments.
API Specifications
Scope
API 5CT specifies the requirements for casing and tubing used in oil and gas wells. M65 casing pipe is designed to meet these standards, ensuring it can withstand the operational pressures and environmental conditions encountered during drilling and production.
Chemical Composition
The chemical composition of M65 casing pipe provides a balance of strength, toughness, and weldability. The typical chemical composition includes:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.28 max |
| Manganese (Mn) | 1.40 max |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 0.55 max |
Mechanical Properties
The mechanical properties of M65 casing pipe are designed to ensure durability and reliability under various operational conditions. The typical mechanical properties include:
- Tensile Strength: 552-758 MPa (80-110 ksi)
- Yield Strength: Minimum 448 MPa (65 ksi)
- Elongation: Minimum 19% in 2 inches
Pipe Sizes
M65 casing pipe is available in a range of sizes to accommodate different wellbore diameters and depths. Standard sizes are specified by their outside diameter (OD) and wall thickness. Common sizes include:
- Outside Diameter (OD): 4 1/2 inches to 20 inches
- Wall Thickness: Varies based on application requirements (e.g., 0.224 inches, 0.250 inches, etc.)
Technical Details, Dimensions, and Tolerances
Dimensions
The dimensions of M65 casing pipe are specified by their outside diameter (OD) and wall thickness. Standard sizes adhere to API 5CT requirements. Common dimensions include:
- Outside Diameter (OD): 4 1/2 inches to 20 inches
- Wall Thickness: Varies based on application requirements.
Tolerances
API 5CT outlines precise tolerances to ensure the pipes meet quality and performance standards. These tolerances include:
- Outside Diameter (OD): ±1% of the specified OD
- Wall Thickness: ±12.5% of the specified wall thickness
- Weight: ±10% of the nominal weight per unit length
Wall Thickness & Tolerance
The wall thickness of M65 casing pipe is critical for its performance in drilling and production operations. Tolerances on wall thickness ensure consistent performance. The standard tolerances include:
- Wall Thickness Tolerance: ±12.5% of the specified wall thickness.
- Minimum Wall Thickness: The minimum wall thickness must not be less than 87.5% of the specified nominal wall thickness.
Product Description
| Standard: | API 5CT | Grade: | J55/N80/P110 |
| Thickness: | 2.87-16.13mm | Section Shape: | Round |
| Outer Diameter: | 26.7-114.3mm | Place of Origin: | China(Mainland) |
| Secondary or not: | Non-secondary | Application: | Oil Pipe |
| Technique: | Cold Drawn/Hot Rolled | Certification | API |
| Surface Treatment: | Black,Varnish | Special Pipe: | API Pipe |
API-5CT Seamless Tubing
| Standard | API 5CT/ ISO11960 | |
| Grade | Group.1 | H40/PSL.1, J55/PSL.1, J55/PSL.2, J55/PSL.3, K55/PSL.1, K55/PSL.2, K55/PSL.3,
N80(1)/PSL.1, N80(1)/PSL.2, N80(Q)/PSL.1, N80(Q)/PSL.2, N80(Q)/PSL.3 |
| Group.2 | M65/PSL.1, M65/PSL.3, L80/PSL.2, L80(1)/PSL.1, L80(1)/PSL.3, L80(9Cr)/PSL.1, L80(13Cr)/PSL.1, C90/PSL.1, C90/PSL.2, C90/PSL.3, T95/PSL.1, T95/PSL.2T95/PSL.3 | |
| Group.3 | P110/PSL.1, P110/PSL.2, P110/PSL.3, | |
| Group.4 | Q125/PSL.1, Q125/PSL.2, Q125/PSL.3, | |
| Minimum Order Quantity | 20 Ton | |
| Outside Diameter Ranges | Tubing | 1.05 inch to 4 1/2 inch or 48.26mm to 114.3mm |
| Casing | 4 1/2 inch to 30inch or 114.3mm to 762mm | |
| Wall Thickness | According to API 5CT Standard | |
| Length | Tubing | R1 (6.10m to 7.32m), R2 (8.53m to 9.75m), R3 (11.58m to 12.80m) |
| Casing | R1 (4.88m to 7.62m), R2 (7.62m to 10.36m), R3 (10.36m to 14.63m) | |
| Type | Seamless | |
| Type of End-Finish | Tubing | P, I, N, U |
| Casing | P, S, B, L | |
Materials and Manufacture
Materials
M65 casing pipe is made from carbon steel, providing a balance of strength, toughness, and cost-effectiveness. The material is suitable for applications where moderate strength and resistance to collapse and internal pressure are required.
Manufacture
The manufacturing process for M65 casing pipe involves several steps to ensure quality and performance:
- Steelmaking: High-quality carbon steel is produced through processes such as electric arc furnace (EAF) or basic oxygen furnace (BOF).
- Forming: The steel is formed into cylindrical shapes using processes such as seamless rolling or welding.
- Heat Treatment: The pipes may undergo heat treatment processes such as normalizing or quenching and tempering to enhance their mechanical properties.
- Finishing: The pipes are finished to achieve the desired surface quality, dimensions, and tolerances.
Tests
To ensure the quality and performance of M65 casing pipe, several tests are conducted as per API 5CT requirements:
Hydrostatic Test
A hydrostatic test is performed to verify the pipes’ ability to withstand internal pressure. The pipes are filled with water and pressurized to a specified level to check for leaks and structural integrity.
Nondestructive Testing (NDT)
Nondestructive testing methods are used to detect internal and surface defects without damaging the pipes. Common NDT methods include:
- Ultrasonic Testing: High-frequency sound waves are used to detect internal flaws.
- Magnetic Particle Inspection: Detects surface and near-surface defects using magnetic fields.
Mechanical Tests
Mechanical tests are conducted to verify the pipes’ mechanical properties, including:
- Tensile Test: Measures tensile strength, yield strength, and elongation.
- Hardness Test: Verifies hardness levels to ensure compliance with specified limits.
- Flattening Test: Checks the pipe’s ability to withstand deformation without cracking.
Heat Treatment
Heat treatment processes such as normalizing or quenching and tempering may be applied to M65 casing pipe to enhance their mechanical properties and ensure consistent performance:
Normalizing
Normalizing involves heating the pipes to a temperature above the critical temperature and then cooling them in air. This process refines the grain structure, improving toughness and strength.
Quenching and Tempering
Quenching and tempering involves heating the pipes to a high temperature, quenching them in water or oil to rapidly cool, and then reheating to a lower temperature to relieve stresses and improve toughness.
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