Products Description
Q125 Casing Pipe is a high-strength oil well casing used in oil and gas drilling projects. The "Q125" indicates the steel grade of the casing. Its tensile strength is above 125,000 psi (about 860 MPa). It belongs to the high-grade steel product in the API 5CT standard and is often used in oil and gas exploration and development projects under extreme working conditions such as shale gas, tight oil, and deep natural gas.
Advantages
1. Extremely high mechanical strength
Q125 casing has high tensile strength, with a minimum tensile strength of 862 MPa (125,000 psi), which is significantly higher than conventional steel grade casing (such as J55 and N80). This strength level enables Q125 casing to maintain structural stability under complex geological conditions, and is particularly suitable for well sections with high formation stress, and can effectively withstand the challenges brought by axial loads and downhole stress changes.
2. Excellent anti-extrusion performance
In high-pressure or deep well and ultra-deep well operations, the external pressure of the formation may cause significant extrusion pressure on the casing. Q125 casing has good anti-extrusion ability, can maintain a stable outer diameter under high formation pressure environment, effectively resist damage caused by back pressure, well fluid column pressure or collapse, and ensure the long-term integrity and safety of the well wall.
3. Reliable connection structure
To meet different construction requirements, Q125 casing can be equipped with a variety of connection forms, including API standard threads (such as BTC, LTC) and premium airtight connections (Premium Connections). Among them, the advanced connection has higher sealing and mechanical strength, which is suitable for gas wells, sour environment wells and HPHT (high temperature and high pressure) wells, which can effectively prevent leakage at the connection and improve the reliability of the entire string system.
4. Good heat treatment stability
Q125 casing adopts quenching + tempering (Q&T) heat treatment process, which can achieve uniformity of material organization and improve the stability of its various mechanical properties. By precisely controlling the heat treatment process, each casing has consistent hardness, strength and toughness, which helps to improve the product consistency in the whole well construction and reduce the potential risks caused by quality fluctuations.
Product Parameters
|
Product Name |
API 5CT Q125 Oil Casing Steel Pipe |
|
Out Diameter |
4 1/2"-20"(114.3-508mm) |
|
Wall Thickness |
5-30mm |
|
Length |
R1(4.88-7.62m), R2(7.62-10.36m), R3(10.36-14.63m) |
|
Material Standard |
API 5CT |
|
Type of Connection |
SC, LC, BC |
|
Surface |
Antirust Coating, color black, red, green etc. |
|
Packing |
Plastic Film, Plastic Cap, Bundle, Woven bag, Wooden Case, Iron Frame |
|
Delivery |
Within 3 days with stock, 15-50 days based on production |
|
Payment |
T/T, D/P, L/C at sight, Usance L/C etc. |
Chemical Requirements
|
Composition, % |
|||||||||
|
Grade |
C |
Mn |
Mo |
Cr |
Ni |
Cu |
P |
S |
Si |
|
Q125 |
0.35max |
1.35max |
0.85max |
1.50max |
0.99max |
- |
0.020max |
0.010max |
- |
Mechanical Property
|
Grade |
Tensile strength min Mpa |
Yield strength min-max Mpa |
|
Q125 |
931 |
862-1034 |
Product Show
Our company has over ten years of experience exporting oil casing without any quality issues, earning widespread praise from customers. You are welcome to visit our company.
Product Packing
We formulate a customized packaging plan for each order: for small-sized (OD≤89mm) stainless steel pipes, we use wooden boxes; for medium-sized (114.3mm≤OD≤273mm) steel pipes, we bundle them and cover with woven bags; for large-sized (OD>273mm) steel pipes, we individually package them and cover with woven bags.
If you have any questions about API 5CT Q125 oil casing steel pipes, please contact us, and we will respond within one hour.
Email: johnny@yqpipeline.com
WhatsApp: +86 15632733100
Tel: +86 317 6376727
FAQ
Q: What are the main material components of Q125 casing?
A: Q125 steel grade is generally low-alloy high-strength steel, and the main alloying elements include carbon (C), manganese (Mn), chromium (Cr), molybdenum (Mo), etc. to improve its strength and toughness. The specific chemical composition will vary slightly according to the manufacturer's standards, and its performance will be optimized through heat treatment.
Q: Is Q125 casing suitable for corrosive well conditions?
A: The standard Q125 steel grade does not have the ability to resist hydrogen sulfide (H₂S) corrosion, but Q125 HC (high crack resistance) or Q125 SS (suitable for sulfur-containing environments) versions can be provided according to customer needs to enhance its service life in acidic or corrosive environments.
Q: Does Q125 casing support third-party testing?
A: Yes, Q125 casing can be inspected and certified by third-party organizations such as SGS, BV, TÜV, etc. The inspection items include dimensional accuracy, mechanical properties, metallographic analysis, thread detection, etc. to ensure that it meets international standards and project requirements.
Q: What are the specifications for the outer diameter and wall thickness of Q125 casing?
A: The conventional outer diameter range of Q125 casing is generally 4-1/2" to 13-3/8", and the wall thickness covers from standard wall thickness to thickened type according to API 5CT standard. The appropriate specifications can be selected according to the project conditions.
Q: Can Q125 casing be used for offshore oil and gas development?
A: Yes. Due to its excellent strength performance and customized corrosion resistance solutions, Q125 casing is also widely used in development wells and evaluation wells of offshore platforms, especially in high pressure and high load environments.
Q: What are the quality control links in the production process of Q125 casing?
A: The production process includes raw material acceptance, heat treatment control, non-destructive testing (such as ultrasonic and eddy current testing), size inspection, thread processing and testing, final inspection and packaging, etc., to ensure that all performance indicators of the product meet the standards.
Q: Does Q125 casing meet international standards?
A: Q125 casing is produced according to API 5CT standard, and can also meet international oil and gas industry standards such as ISO 11960 according to customer needs, ensuring project applicability and interchangeability around the world.
Q: What are the precautions for the storage and transportation of Q125 casing?
A: The casing should avoid direct contact with the ground, be stacked with wooden pads or steel frames, and be equipped with thread protectors to prevent end damage. During transportation, it should be reinforced and tied to avoid mechanical damage caused by sliding, collision or rolling.
Q: Can Q125 casing be coated internally and externally?
A: Yes. To improve corrosion resistance, Q125 casing can be customized with internal coating (such as epoxy resin, glass flakes) and external coating (such as anti-corrosion paint, three-layer PE) to meet the corrosion resistance requirements under different well conditions.
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