Hebei Garisco Petroleum Pipe Co.,Ltd
Hebei Garisco Petroleum Pipe Co.,Ltd

A casing coupling is a short, threaded pipe used to connect two sections of casing in oil and gas wells. It has internal threads on both ends to join casing pipes of the same diameter, ensuring a continuous and secure casing string. Made from high-strength steel, couplings withstand extreme downhole conditions like pressure, corrosion, and mechanical stress.

Casing couplings provide a leak-proof seal, maintaining well integrity. They adhere to API standards for compatibility and reliability. Proper installation is crucial to prevent failures, ensuring well safety and efficiency. Couplings are vital in well construction, stabilizing the wellbore and enabling safe hydrocarbon extraction.

Well Casing Coupling

Casing couplings adhere to API standards, primarily API 5CT, They are classified into different grades (e.g., H-40, J-55, K-55, N-80, P-110) based on strength and performance levels, ensuring suitability for varying downhole pressures, temperatures, and corrosive environments in oil and gas wells.
J55 Coupling LTC STC BTC
J55 Coupling LTC STC BTC
API 5CT J55 casing coupling is a threaded joint used to connect J55 grade casing sections. It complies with API 5CT standards and is suitable for oil and gas wells. Its function is to ensure the seali...
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N80 Coupling LTC STC BTC
N80 Coupling LTC STC BTC
API 5CT N80 casing coupling is a connector for N80-grade casing used in oil and gas wells. N80 is a mid-range steel grade defined by API 5CT, offering a minimum yield strength of 80,000 psi (551 MPa)....
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L80 Coupling LTC STC BTC
L80 Coupling LTC STC BTC
API 5CT L80 casing coupling is a type of coupling used to connect sections of L80-grade casing in oil and gas wells. L80 is a mid-range steel grade defined by the API 5CT (American Petroleum Institute...
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P110 Coupling LTC STC BTC
P110 Coupling LTC STC BTC
API 5CT P110 casing coupling is a connector for P110-grade casing used in high-pressure oil and gas wells. P110 is a high-strength steel grade defined by API 5CT, offering a minimum yield strength of ...
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Installation Method of Casing Coupling

  • Preparation

    Clean and inspect casing pipes and couplings to ensure they meet API standards. Apply thread compound to threads.

  • Alignment

    Properly align threaded ends of casing pipes with the coupling to avoid cross-threading.

  • Threading

    Use a power tong or manual tool to screw pipes into the coupling with controlled torque for a tight connection.

  • Inspection

    Check the connection for proper threading, alignment, and seal integrity using gauges.

  • Testing

    Pressure-test the assembled casing string to confirm integrity and ability to withstand downhole conditions. Proper installation ensures safety and stability.

Casing Coupling VS Tubing Coupling

The primary difference between casing coupling and tubing coupling lies in their application and size.


Casing couplings connect larger-diameter casing pipes used to line the wellbore, providing structural integrity and preventing collapse. Tubing couplings, on the other hand, join smaller-diameter tubing pipes inserted inside the casing, which are used to transport oil, gas, or fluids to the surface.


Both are threaded connectors, but casing couplings are designed for higher strength and pressure resistance, while tubing couplings prioritize efficient fluid flow and are typically smaller and lighter.

Casing Coupling VS Tubing Coupling
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Hebei Garisco Petroleum Pipe Co.,Ltd