API Casing Pipe

API OIL CASING PIPE

In the complex and demanding landscape of oil and gas exploration and production, the integrity and performance of casing pipes are of utmost importance. OAK offers high-quality API casing pipes that are engineered to meet the toughest challenges.

1. Basic Parameters

1.1 Dimensions

Outer Diameter: OAK API casing pipes are available in a wide array of outer diameters, typically ranging from 5-1/2 inches (139.7 mm) to 20 inches (508 mm). This extensive selection enables seamless integration into diverse wellbore designs, whether it's a shallow onshore well or a deep - water offshore well.

Wall Thickness: The wall thickness varies depending on the specific grade and the operational requirements of the well. Thicknesses can span from as little as 0.25 inches (6.35 mm) to 1.0 inches (25.4 mm). This flexibility ensures that the casing can endure the internal and external pressures encountered during oil and gas production.

Length: We offer casing pipes in two main standard length ranges. Range 2 typically spans from 25 - 34 feet, while Range 3 extends from 34 - 48 feet. These lengths are carefully chosen to reduce the number of connections during installation, minimizing the risk of leaks and enhancing overall structural integrity.

1.2 Grades

J55/K55: These lower-grade steels are well-suited for shallow wells where the pressure and mechanical loads are relatively mild. They provide a cost - effective solution without sacrificing essential performance.

N80 (Type 1 and Q) and L80: Medium - strength grades, they are designed for deeper wells with elevated pressure and temperature conditions. N80Q, in particular, offers enhanced impact strength compared to N80-1, making it more reliable in harsh environments.

P110 and Q125: High-strength grades, these are engineered for extremely deep and high - pressure wells. They can withstand the harshest conditions, including high - temperature and high - corrosive environments. Additionally, we offer 13Cr casing pipes, which are highly resistant to corrosion, especially in wells with high CO₂ and H₂S concentrations.

1.3 Thread Connections

Buttress Thread Coupling (BTC): BTC connections are known for their high-strength and excellent sealing capabilities. They are designed to withstand high-torque applications and are commonly used in wells where the casing is subjected to significant mechanical stress.

Long Buttress Thread Coupling (LTC): LTC connections offer similar strength and sealing performance as BTC but with a longer thread engagement. This makes them suitable for applications where additional connection security is required, such as in deep wells or wells with complex geological formations.

Premium Connections: OAK offers a range of premium connections that are designed to replace traditional connections like VAM. These include Tenaris connections such as Tenaris Hydril CS, TSH W511 and their blue series, wedge series 500, legacy series, as well as Hunting connections like Seal-Lock-Flush (SLX) and Seal-Lock Semi Flush (SLSF). Premium connections provide enhanced performance in terms of torque resistance, pressure integrity, and corrosion resistance, making them ideal for challenging well conditions.

2. Performance

2.1 High Pressure Resistance

OAK API casing pipes are meticulously engineered to withstand extremely high pressures. Whether it's the internal pressure exerted by the flowing oil and gas or the external hydrostatic pressure from the surrounding rock formations, our casing pipes can maintain their structural integrity. This high-pressure resistance is crucial for ensuring the safe and efficient operation of oil and gas wells, preventing blowouts and other dangerous incidents.

2.2 Collapse Resistance

In deep wells, the external pressure from the overlying rock can be substantial. OAK casing pipes are designed with high collapse resistance to withstand these forces. The choice of appropriate grade and wall thickness, along with advanced manufacturing techniques, ensures that the casing can maintain its shape and functionality even under extreme external pressures.

2.3 Corrosion Resistance

The oil and gas production environment is often highly corrosive, with the presence of substances such as water, CO₂, H₂S, and various salts. OAK addresses this challenge by using high-quality steels and, in some cases, corrosion-resistant alloys (CRAs). Our 13Cr casing pipes, for example, are specifically designed to resist corrosion in highly aggressive environments. This corrosion resistance significantly extends the lifespan of the casing pipes, reduces maintenance costs, and minimizes the risk of leaks due to corrosion - induced failures.

2.4 Mechanical Strength

The casing pipes are engineered to resist various mechanical loads, including tension, compression, and bending. This mechanical strength allows them to endure the rigors of installation, production, and any subsequent workover operations. They can also withstand the vibrations and impacts associated with the movement of drilling and production equipment in the wellbore.

3. Application Scenarios

3.1 Conductor Casing

The conductor casing is the first casing string installed in a well. OAK API casing pipes are commonly used as conductor casings as they provide the initial support for the wellbore and help to isolate the surface formations from the drilling operations. They protect the wellbore from collapsing and prevent surface contaminants from entering the well.

3.2 Surface Casing

Surface casing is installed after the conductor casing and is used to isolate shallow water - bearing formations and provide support to the upper part of the wellbore. OAK surface casing pipes are designed to withstand the relatively lower pressures and mechanical loads at this stage of well construction while ensuring the integrity of the wellbore and preventing the contamination of fresh water sources.

3.3 Intermediate Casing

Intermediate casing is used in deeper wells to isolate troublesome formations, such as high - pressure zones, unstable rock layers, or formations with potential fluid migration problems. OAK intermediate casing pipes are engineered to handle the complex pressure and mechanical conditions encountered in these applications, providing a reliable barrier to ensure the safe continuation of drilling operations.

3.4 Production Casing

Production casing is the final casing string installed in a well and is responsible for containing the produced oil and gas and protecting the wellbore during production. OAK production casing pipes are designed to withstand the high pressures and corrosive environments associated with oil and gas production. They also provide a secure conduit for the hydrocarbons to flow to the surface, ensuring the long-term productivity and safety of the well.

4. Applied Oil Fields and Companies

OAK API casing pipes have been successfully deployed in numerous oil fields across the globe. In the prolific Bakken Formation in North America, known for its challenging geological conditions, many oil companies rely on OAK casing pipes for their well construction. The pipes' ability to withstand high pressures and resist corrosion has made them a preferred choice in this region.

In the offshore oil fields of the Gulf of Mexico, where the environment is harsh and the operational requirements are stringent, OAK casing pipes have proven their reliability. The premium connections and high - strength grades offered by OAK are well - suited for the deep - water drilling and production operations in this area.

Among the companies that have chosen OAK API casing pipes are major international oil and gas corporations such as Chevron, TotalEnergies, and Equinor. These companies recognize the importance of high - quality casing pipes in ensuring the safety and efficiency of their operations and have trusted OAK to provide them with the products they need.

In conclusion, OAK API casing pipes offer a combination of outstanding basic parameters, exceptional performance, and wide - ranging application scenarios. Their use in major oil fields and by leading companies is a testament to their quality and reliability. Whether it's a simple onshore well or a complex offshore project, OAK API casing pipes are the ideal choice for ensuring the long - term success of oil and gas production.

If you have a need for API casing pipe, don't hesitate to get in touch with the OAK team for high-quality products and technical support.