Knowledge

EUE tubing is forged by adding thickness (Upset) to the end of the tubing to ensure that the physical strength at the 8-threaded connection is equivalent to or higher than that of

EUE (External Upset End) is an 8-tooth circular threaded joint made by forging and increasing the wall thickness of the pipe end before processing. It can ensure that the connectio

‌Casing can be classified into conductor casing, surface casing, intermediate casing, and production casing based on their applications‌. The conductor casing isolates seawater or

Annular Velocity refers to the speed at which a fluid—such as drilling mud or cement—flows within the annular space between the pipe string and the wellbore wall (or between two co

K55 is one of the 10 steel grades defined by the API 5CT standard (H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110, Q-125). It belongs to low-strength carbon steel pipe and i

Drill pipe is a steel pipe with threads at the tail end, used to connect surface equipment of drilling rigs with drilling and grinding equipment or bottom hole devices located at t

API 5CT L80 is a widely used medium-strength carbon and alloy steel grade for oil and gas casing and tubing, fully compliant with the API 5CT international standard for OCTG (Oil C

A technical review of API 5CT L80 casing and tubing, discussing the quenched & tempered heat treatment and the specialized sub-grades designed for H2S and CO2 resistance.

API casing is a hollow section steel pipe manufactured in accordance with standards such as API 5CT. Its outer diameter ranges from 114.3 millimeters to 508 millimeters, and its le

J55 petroleum casing is a key pipe widely used in petroleum drilling engineering, mainly used to protect the wellbore, isolate oil and non oil layers, support the wellbore wall, an

API 5CT K55 is one of the most widely used materials for oil well casing because it offers a balance of strength, weldability, and cost-effectiveness.

L80 tubing is an API 5CT-certified steel grade with a fixed yield strength of 552 MPa (80 ksi), produced via quench and tempering for uniform microstructure. It includes corrosion-