L80 Oil Casing Pipe, P110 Threaded Casing, 13Cr Casing, N80 Seamless Casing, K55 Pipe Material, P110

## L80 Oil Casing Pipe

 Introduction

The L80 Oil Casing Pipe is a fundamental component in the oil and gas industry, designed to provide strength and integrity in highpressure environments. Manufactured by Tianjin Longkai Lai Company, this casing pipe meets the rigorous demands of modern drilling operations. With its high yield strength and resistance to corrosion, the L80 casing pipe is suitable for a variety of applications within the oil and gas sector, particularly in challenging environments where safety and reliability are paramount.

Casing pipes are critical in the construction of oil wells, providing structural support to the wellbore and preventing the collapse of the surrounding rock formations. They also serve as a barrier to protect groundwater from contamination and to control the flow of fluids during drilling. The L80 casing pipe is specifically engineered to meet these demands, ensuring operational efficiency and safety during drilling and extraction processes.

 Specifications

The specifications of the L80 Oil Casing Pipe are tailored to meet the diverse needs of the oil and gas industry. Key specifications include:

 Outer Diameter: Ranges from 4.5 inches to 20 inches, accommodating various drilling requirements. The outer diameter is crucial as it determines the pipe's ability to handle the internal pressures exerted by drilling fluids.

 Wall Thickness: Available options range from 0.280 inches to 0.500 inches. The wall thickness contributes significantly to the pipe's overall strength, resistance to external pressures, and ability to withstand corrosive environments.

 Yield Strength: The L80 casing pipe boasts a minimum yield strength of 60,000 psi, making it suitable for highpressure applications. Yield strength is a critical factor that determines how much load a material can withstand without permanent deformation.

 Material: Made from highstrength alloy steel, the L80 casing pipe is specifically engineered for oil and gas applications. The choice of material plays a vital role in the pipe's performance, particularly in terms of durability and corrosion resistance.

 Chemical Composition

The chemical composition of the L80 casing pipe is essential to its performance and durability. The main elements include:

 Carbon (C): 0.24%  0.30%. Carbon content affects the hardness and strength of the steel. Higher carbon levels can increase strength but may also reduce ductility.

 Manganese (Mn): 0.40%  0.90%. Manganese is added to improve the hardenability of steel and enhance its strength and toughness.

 Silicon (Si): 0.10%  0.35%. Silicon is used to improve the strength and elasticity of the steel and to enhance its resistance to oxidation.

 Chromium (Cr): 0.40%  0.60%. Chromium improves the corrosion resistance of steel and enhances its strength at high temperatures.

 Nickel (Ni): ≤ 0.40%. Nickel contributes to toughness and ductility, particularly in lowtemperature environments.

 Molybdenum (Mo): ≤ 0.15%. Molybdenum enhances the strength and hardness of the steel and improves its resistance to corrosion.

This carefully balanced chemical composition contributes to the L80 casing pipe's ability to perform effectively under extreme conditions, making it suitable for various applications in the oil and gas industry.

 Pricing Advantage

Tianjin Longkai Lai Company leverages efficient manufacturing processes to offer competitive pricing on L80 Oil Casing Pipes. Our direct sourcing of raw materials and streamlined production techniques allow us to pass savings on to our customers without compromising quality.

By maintaining a robust supply chain and investing in advanced manufacturing technologies, we are able to produce highquality casing pipes at lower costs. This pricing advantage is crucial in today’s competitive oil and gas market, where cost efficiency can significantly impact overall project budgets.

 Special Connector Advantages

The L80 casing pipe is compatible with highperformance connectors such as VAM FJL and VAM TOP. These connectors are designed to ensure secure, leakproof joints that can withstand extreme pressures. The use of these specialized connectors enhances the overall integrity of the casing system, making them essential for safe drilling operations.

 VAM FJL Connector: Known for its robust design, the VAM FJL connector provides excellent sealing capabilities, ensuring that the joints remain secure even under high pressure and temperature fluctuations. This is particularly important in deep well drilling, where the integrity of the casing system is critical.

 VAM TOP Connector: This connector is engineered for highpressure applications and is designed to minimize the risk of leaks. Its innovative design allows for easy installation and maintenance, reducing downtime during drilling operations.

These connectors not only improve the performance of the casing system but also enhance safety by reducing the likelihood of failures that could lead to environmental hazards or operational disruptions.

 Applications

The L80 oil casing pipe is used in various applications within the oil and gas industry, each of which requires specific properties that the L80 pipe is designed to provide. Some of the key applications include:

# 1. Deep Well Drilling Operations

Deep well drilling involves reaching significant depths to access oil and gas reserves. The high yield strength of the L80 casing pipe makes it ideal for these operations, as it can withstand the immense pressures encountered at great depths. The durability and resistance to deformation ensure that the casing maintains its structural integrity throughout the drilling process.

# 2. HighPressure Oil and Gas Extraction

In many oil fields, especially those that are mature or located offshore, the pressures encountered are considerably higher than in conventional fields. The L80 casing pipe’s minimum yield strength of 60,000 psi allows it to effectively handle these highpressure conditions, making it a reliable choice for operators seeking to extract oil and gas efficiently.

# 3. Offshore and Onshore Oil Field Operations

The versatility of the L80 casing pipe makes it suitable for both offshore and onshore drilling operations. Offshore drilling often presents unique challenges, such as exposure to saltwater and harsh environmental conditions. The corrosionresistant properties of the L80 casing pipe enable it to withstand these challenges, ensuring a long service life and reducing maintenance costs.

# 4. Environments with Corrosive Substances

In certain geological formations, the presence of corrosive fluids can pose a significant risk to the integrity of casing pipes. The chemical composition of the L80 casing pipe, which includes chromium and molybdenum, enhances its resistance to corrosion. This makes it suitable for use in environments where aggressive chemicals are present, such as in sour gas wells.

# 5. Hydraulic Fracturing (Fracking)

The hydraulic fracturing process involves injecting highpressure fluids into the wellbore to create fractures in the rock formation, allowing oil and gas to flow more freely. The L80 casing pipe’s ability to withstand high pressures makes it an excellent choice for use in fracking operations, where maintaining the integrity of the wellbore is critical.

 Quality Control

Tianjin Longkai Lai Company implements rigorous quality control measures throughout the manufacturing process to ensure that each L80 oil casing pipe meets the highest standards of performance and reliability. Our quality control processes include:

# 1. Material Testing

Each batch of raw materials is subjected to thorough testing for compliance with industry standards. This includes verifying the chemical composition and mechanical properties of the steel to ensure it meets the specifications required for L80 casing pipes.

# 2. Dimensional Verification

Automated systems check the dimensions of each pipe to ensure they meet the specified tolerances. This includes measuring the outer diameter, wall thickness, and length of the pipes to ensure they conform to design requirements.

# 3. Pressure Testing

Final products are subjected to pressure tests to verify their integrity and performance standards. This testing simulates the conditions that the casing pipes will encounter in the field, ensuring that they can withstand the pressures they will face during operation.

# 4. NonDestructive Testing (NDT)

In addition to pressure testing, nondestructive testing methods such as ultrasonic testing and radiographic testing are employed to detect any internal defects or inconsistencies in the material. This ensures that only the highest quality pipes are delivered to customers.

# 5. Final Inspection

Before shipping, each L80 casing pipe undergoes a final inspection to ensure it meets all specifications and quality standards. This includes visual inspections for surface defects and a review of all testing documentation.

 Manufacturing Process

The manufacturing process for the L80 oil casing pipe involves several key stages, each designed to ensure the highest levels of quality and performance:

# 1. Raw Material Procurement

The process begins with the procurement of highquality raw materials. Tianjin Longkai Lai Company sources alloy steel from reputable suppliers to ensure that the chemical composition meets the required standards.

# 2. Hot Rolling

The raw steel is then subjected to hot rolling, a process where the steel is heated and passed through rollers to achieve the desired shape and thickness. This process not only shapes the steel but also refines its grain structure, enhancing its mechanical properties.

# 3. Heat Treatment

After rolling, the pipes undergo heat treatment to improve their strength and toughness. This process involves heating the pipes to a specific temperature and then cooling them rapidly, which enhances their yield strength and ductility.

# 4. Forming and Welding

For pipes that require welding, the edges are prepared and then welded together using advanced welding techniques. This ensures that the joints are strong and capable of withstanding the pressures encountered during drilling operations.

# 5. Surface Treatment

Once the pipes are formed, they undergo surface treatment to improve their resistance to corrosion. This may include applying protective coatings or treatments that enhance their durability in harsh environments.

# 6. Final Inspection and Testing

The final stage of the manufacturing process involves thorough inspections and testing to ensure that each L80 casing pipe meets the strict quality standards required for oil and gas applications.

 Industry Standards

Tianjin Longkai Lai Company ensures that its L80 oil casing pipes comply with relevant industry standards, such as:

 API Specification 5CT: This standard from the American Petroleum Institute outlines the requirements for casing and tubing used in oil and gas drilling. The L80 casing pipe is manufactured to meet or exceed these specifications, ensuring reliability and performance in the field.

 ISO 3183: This international standard specifies the requirements for the design, manufacturing, and testing of line pipes used in the transportation of hydrocarbons. Compliance with this standard ensures that the L80 casing pipe is suitable for use in various applications.

 NACE MR0175: This standard provides guidelines for materials used in oil and gas production in sour service environments. The L80 casing pipe’s resistance to corrosion makes it compliant with these guidelines, ensuring safe use in challenging conditions.

 Conclusion

The L80 Oil Casing Pipe from Tianjin Longkai Lai Company is engineered for reliability and performance in the most demanding environments. With its exceptional yield strength, corrosion resistance, and compatibility with highperformance connectors, the L80 casing pipe is a trusted solution for a wide range of applications in the oil and gas industry.

Our commitment to quality and customer satisfaction ensures that you receive a product that meets your operational needs. By adhering to stringent quality control measures and industry standards, we guarantee that each L80 casing pipe is capable of withstanding the rigors of modern drilling operations.

In choosing the L80 Oil Casing Pipe, you are investing in a product that not only meets the challenges of today’s oil and gas industry but also contributes to the safety and efficiency of your drilling operations. With Tianjin Longkai Lai Company as your supplier, you can be confident in the quality and performance of your casing solutions.

Advantages/Features:

1.Established in 2008 with 17 years of operation, registered capital of 11.18 million CNY, workshop area of 8,000 m2, and annual turnover of 20 million CNY.

2.Possesses import/export rights, ISO 9001 certification, API 5CT certification, and multiple national patents.

3.Equipped with high-precision CNC lathes, thread fastening machines, hydraulic testers, and comprehensive inspection tools.

4.Specializes in producing J55, K55, N80-Q, L80, and P110 oil casings, couplings, subs, and adapters.

5.Maintains 2,000 tons of high-resistance corrosion-resistant oil casings (e.g., 80S, 90S, 110S, L80-1Cr/3Cr/13Cr) in stock.

6.Offers custom threading (e.g., wedge-type, double-step, variable pitch), coating services, and produces over 10,000 specialty threaded components annually.

?Product Name?: API-5CT Seamless Casing and Tubing
?Steel Grade?: J55, N80, P110, H40, K55, L80, L80-3Cr/9Cr/13Cr,  M65, C90, T95, Q125
?Material?: 34CrMo4, H40, J55, K55, N80, L80, M65, C90, T95, P110, Q125
?Standard?: API 5CT/ISO 11960
?Technique?: Cold Drawn/Hot Rolled
?Application?: Oil and Gas Pipes

?Outer Diameter Ranges?:

• ?Tubing?: 48.26mm~114.3mm (1.05 inches~4 1/2 inches)

• ?Casing?: 114.3mm~762mm (4 1/2 inches~30 inches)
  ?Wall Thickness?: 2.87mm~30mm (compliant with API 5CT standards)
  ?Length Ranges?:

• ?Tubing?:

• R1: 6.10m~7.32m

• R2: 8.53m~9.75m

• R3: 11.58m~12.80m

• ?Casing?:

• R1: 4.88m~7.62m

• R2: 7.62m~10.36m

• R3: 10.36m~14.63m
  ?End-Finish Types?:

• ?Tubing?: P, I, N, U

• ?Casing?: P, S, B, L

?Product Features?:

1. ?Material Optimization?:

• Cr-Mo series steel with precise chemical composition control ensures resistance to Sulfide Stress Corrosion Cracking (SSCC).

• Quenching and tempering heat treatment forms a uniform and fine sorbite structure, achieving high hardness and tempering stability.

2. ?Heat Treatment Process?:

• Strict temperature-controlled quenching and tempering guarantee consistent mechanical properties, narrow yield strength ranges, and controllable hardness.

3. ?Sulfide Corrosion Resistance?:

• Microstructure of fully tempered martensite is suitable for H?S-containing acidic oil and gas environments.

• Passes NACE standard tests, maintaining excellent SSC resistance even under 85%~90% SMYS (Specified Minimum Yield Strength).

?Inspection Standards?:

• ?Non-destructive Testing?:

• Full-body inspection for longitudinal/transverse defects on inner and outer surfaces, with standard notch depth ≤5% of wall thickness.

• Compliant with API 5CT standards, ensuring freedom from cracks, pores, and other defects.

?Packaging & Delivery?:

• ?Packaging?: Seawater-resistant steel shelves, iron pallets, or customized solutions per customer requirements.

• ?Delivery Time?: 20–55 days (varies based on order size and process complexity).

• ?Minimum Order Quantity (MOQ)?: 20 tons.

?Application Scenarios?:

• ?Sour Oil and Gas Fields?: High-corrosion environments with H?S and CO?.

• ?Deep/Ultra-Deep Wells?: Resistant to high pressure and temperatures (up to 200°C+).

• ?Cementing and Workover?: Supports wellbore stability and isolates formation fluids.

?Certification & Surface Treatment?:

• ?Certification?: API pipe certification.

• ?Surface Treatment?: Black paint, varnish coating; cross-sectional shape: round.

• ?Origin?: China.

?Note?: This product is non-secondary processed and supports customization. Contact the supplier for technical agreements.

rrosion after 3-year exposure to brackish groundwater.

?Specs?:

Material: J55 steel (Yield strength: 55,000 psi)

Pressure Rating: 2,300psi burst / 1,800psi collapse

Certifications: API 5CT, ISO 11960

?Support?: Free API drift testing videos & 45-day delivery to North America

?Critical Parameters?

·         ?Yield Strength?: 758–862 MPa

·         ?Charpy V-Notch Impact?: ≥55J @ -20°C (Arctic Service Compliant)

·         ?Dimensional Tolerance?:

o    OD: ±0.65% (API 5CT Table 7)

o    WT: +10%/-8.5%

?High-Temperature Performance?

·         ?Operational Limits?:

o    ?Temperature?: -50°C to +204°C (Full CTE Compensation)

o    ?H?S Partial Pressure?: ≤1.5psi (NACE MR0175/ISO 15156-2 Level II)

·         ?Coating?:

o    Internal: 250μm Epoxy-Phenolic Lining (ISO 15741)

o    External: 3LPP FBE Coating (ISO 21809-1)

?Threaded Connection?

·         ?Type?: TenarisBlue? TBHC Gas-Tight Thread (API 5B Premium)

·         ?Sealing Capacity?:

o    Internal Pressure: 138 MPa

o    External Pressure: 116 MPa

·         ?Torque Monitoring?: RFID-Embedded Shoulder Tag (Real-Time Data Logging)

?Applications?

·         Ultra-deep HPHT wells (≥10,000m TVD, 140MPa Bottomhole Pressure)

·         CO?-EOR injection wells with cyclic thermal loading

·         Arctic permafrost zones requiring low-temperature toughness

?Testing & Certification?

1.   ?Destructive Testing?:

o    Full-Scale Fatigue Test (FSFT) @ 90% SMYS × 10? cycles

o    HTHP Autoclave Corrosion Test (30d @ 150°C, 15% HCl)

2.   ?Non-Destructive Testing?:

o    Phased Array UT (ASME V Article 4)

o    Eddy Current Inspection for Coating Integrity

?Packaging & Delivery?

·         ?Anti-Corrosion Packaging?: VCI Shrink Film + Desiccant Capsules (ISO 22088-3)

·         ?Lead Time?: 60 Days (CIF Rotterdam Port)

·         ?Customization?:

o    Pre-installed RFID Collars for IoT Well Monitoring

o    Field-End Bevel Protection with Biodegradable Caps

?Formatting Consistency?:

·         ?Bolded Headers? for hierarchical navigation

·         ?Dual Units?: Metric (Primary) / Imperial (Secondary)

·         ?Risk Mitigation?: Explicit thermal/chemical limits in red-line text

·         ?Brand Integration?: Licensed TenarisBlue? threading and ISO-certified coatings

Advantages/Features:

1.Established in 2008 with 17 years of operation, registered capital of 11.18 million CNY, workshop area of 8,000 m2, and annual turnover of 20 million CNY.

2.Possesses import/export rights, ISO 9001 certification, API 5CT certification, and multiple national patents.

3.Equipped with high-precision CNC lathes, thread fastening machines, hydraulic testers, and comprehensive inspection tools.

4.Specializes in producing J55, K55, N80-Q, L80, and P110 oil casings, couplings, subs, and adapters.

5.Maintains 2,000 tons of high-resistance corrosion-resistant oil casings (e.g., 80S, 90S, 110S, L80-1Cr/3Cr/13Cr) in stock.

6.Offers custom threading (e.g., wedge-type, double-step, variable pitch), coating services, and produces over 10,000 specialty threaded components annually.

?Product Name?: API-5CT Seamless Casing and Tubing
?Steel Grade?: J55, N80, P110, H40, K55, L80, L80-3Cr/9Cr/13Cr,  M65, C90, T95, Q125
?Material?: 34CrMo4, H40, J55, K55, N80, L80, M65, C90, T95, P110, Q125
?Standard?: API 5CT/ISO 11960
?Technique?: Cold Drawn/Hot Rolled
?Application?: Oil and Gas Pipes

?Outer Diameter Ranges?:

• ?Tubing?: 48.26mm~114.3mm (1.05 inches~4 1/2 inches)

• ?Casing?: 114.3mm~762mm (4 1/2 inches~30 inches)
  ?Wall Thickness?: 2.87mm~30mm (compliant with API 5CT standards)
  ?Length Ranges?:

• ?Tubing?:

• R1: 6.10m~7.32m

• R2: 8.53m~9.75m

• R3: 11.58m~12.80m

• ?Casing?:

• R1: 4.88m~7.62m

• R2: 7.62m~10.36m

• R3: 10.36m~14.63m
  ?End-Finish Types?:

• ?Tubing?: P, I, N, U

• ?Casing?: P, S, B, L

?Product Features?:

1. ?Material Optimization?:

• Cr-Mo series steel with precise chemical composition control ensures resistance to Sulfide Stress Corrosion Cracking (SSCC).

• Quenching and tempering heat treatment forms a uniform and fine sorbite structure, achieving high hardness and tempering stability.

2. ?Heat Treatment Process?:

• Strict temperature-controlled quenching and tempering guarantee consistent mechanical properties, narrow yield strength ranges, and controllable hardness.

3. ?Sulfide Corrosion Resistance?:

• Microstructure of fully tempered martensite is suitable for H?S-containing acidic oil and gas environments.

• Passes NACE standard tests, maintaining excellent SSC resistance even under 85%~90% SMYS (Specified Minimum Yield Strength).

?Inspection Standards?:

• ?Non-destructive Testing?:

• Full-body inspection for longitudinal/transverse defects on inner and outer surfaces, with standard notch depth ≤5% of wall thickness.

• Compliant with API 5CT standards, ensuring freedom from cracks, pores, and other defects.

?Packaging & Delivery?:

• ?Packaging?: Seawater-resistant steel shelves, iron pallets, or customized solutions per customer requirements.

• ?Delivery Time?: 20–55 days (varies based on order size and process complexity).

• ?Minimum Order Quantity (MOQ)?: 20 tons.

?Application Scenarios?:

• ?Sour Oil and Gas Fields?: High-corrosion environments with H?S and CO?.

• ?Deep/Ultra-Deep Wells?: Resistant to high pressure and temperatures (up to 200°C+).

• ?Cementing and Workover?: Supports wellbore stability and isolates formation fluids.

?Certification & Surface Treatment?:

• ?Certification?: API pipe certification.

• ?Surface Treatment?: Black paint, varnish coating; cross-sectional shape: round.

• ?Origin?: China.

?Note?: This product is non-secondary processed and supports customization. Contact the supplier for technical agreements.

Tianjin  Grand Victory Petroleum Equipment Co., Ltd. is a comprehensive enterprise for production, processing, sales, technology research and development, and spot storage. Located in Jinghai District, Tianjin, China, it was founded in 2008 with a registered capital of 11.18 million yuan. It has import and export rights, ISO9001 quality system certification, American Petroleum Institute API 5CT certification and a number of national patent certificates. The production workshop is equipped with several types of equipment such as highprecision CNC lathes, thread tightening machines, hydraulic presses, etc., and complete inspection and measurement instruments. Products include J55, K55, N801/Q, L80, P110 and other oil casing, couplings, Pup Joint、Xover （Cross over）; 80S, 90S, 110S, L801Cr/3Cr/13Cr and other highcorrosion resistant oil casing spot storage, with a longterm reserve of about 2,000 tons. At the same time, it undertakes the processing and copper plating of special sealing threads such as direct connection, wedge shape, double step, variable pitch, etc. for oil well pipes and petroleum accessories, with fast delivery and excellent quality, reducing costs and increasing efficiency for customers.  Our vision: to build an international oil pipeline equipment enterprise with integrity and innovation. We welcome leaders and friends from all walks of life to visit us for cooperation and common development.