Casing couplings are common pipe fittings used in industrial piping connections; they are short pipes used to connect two pipes. They are also called external joints. Due to their ease of use, casing couplings are widely used in civil construction, industry, agriculture, and other fields.
Classification
- By Steel Grade: Casing couplings can be classified into various types according to steel grade, including but not limited to J55, K55, N801, N80Q, L80 1, L80 9Cr, L80 13Cr, C90, T95, P110, Q125, etc.
- By Specification: Casing couplings come in various specifications, commonly including 41/2, 5, 51/2, 65/8, 7, 75/8, 85/8, 95/8, 103/4, 113/4, 133/8, 16, 185/8, 20, etc. Among these, commonly used specifications include 51/2, 7, 95/8, and 133/8.
- By Thread Type: Casing couplings come in various thread types, including long round threads, short round threads, trapezoidal threads, and special threads. It is important to note that not all casing couplings are available with long round threads. For example, casing couplings of sizes 103/4, 113/4, 133/8, 16, and 185/8 are only available with short round threads and trapezoidal threads.
Function
The primary function of casing couplings is to connect two casings, ensuring a tight and secure connection. In the oil and gas industries, casing couplings are indispensable components in drilling and completion operations.
Applications:
In drilling engineering practice, casing couplings are mainly used in the following scenarios:
- Deep well casing suspension: When using a spindle-type hanger, the coupling directly bears the weight of the casing string, forming a metal-to-metal seal.
- Complex well structures: Horizontal wells and extended reach wells require high-torsion couplings with torque capacity meeting API standards.
- Corrosive environments: 13Cr couplings meet API standards for service life in CO₂/H₂S-containing oil and gas fields.
- Rapid installation requirements: Simple snap-fit couplings allow for single-person connection operations.
GNEE Casing Coupling in stock
