13-3/8''BTC K55

13-3/8''BTC K55
13-3/8'' BTC K55 is a specific specification used in the oil and gas industry to describe casing, a critical component for wellbore stability and fluid containment. Here's a detailed breakdown:

Full English Description

13-3/8 inch BTC (Buttress Thread Connection) casing, grade K55.

Component Explanations

  1. 13-3/8 inch
    Refers to the outer diameter (OD) of the casing, equivalent to 13.375 inches. This is a large-sized casing typically used in the upper sections of oil and gas wells (often in surface or intermediate casing strings) to provide structural support and isolate shallow formations.
  2. BTC
    Stands for Buttress Thread Connection, a standardized threaded joint design. Its unique thread profile features a steep load-bearing flank (to withstand high axial tension/compression) and a shallow non-load flank (for easier makeup). BTC connections are widely used in casing applications where reliable sealing and high strength are required, especially in medium to deep wells.
  3. K55
    Denotes the material grade of the casing. K55 is a low to medium strength grade with a minimum yield strength of 55,000 psi (pounds per square inch). It is commonly made from carbon steel and is suitable for less demanding well conditions, such as shallow wells or formations with low pressure and minimal corrosion. K55 casing balances cost-effectiveness with adequate mechanical performance for many standard drilling scenarios.
In summary, 13-3/8'' BTC K55 describes a large-diameter casing with a Buttress thread connection, made from K55 grade steel, ideal for upper well sections where moderate strength and reliable threading are required.