The casing spool in a conventional wellhead system is the component that allows for an additional string of casing to be set in the well. Depending on the casing program for the well, there can be one or more casing spools and they perform the following functions:
- Allows for suspending the next casing string in the well
- Supports the blowout preventers (BOP’s) while drilling
- Provides outlets for fluid returns
- Provides a means to test the blowout preventers while drilling
- Has flanges on both the top and bottom of the assembly
- Has a seal area in the bottom flange for a secondary seal between the casing annulus and the flanged connection
- Utilize a test port in the bottom flange that allows for the secondary seal and the flanged connection to be pressure tested
Casing Spool Components
C-22 Casing Spools
C-22 casing spools incorporate the industry workhorse C-22 geometry that will accept a standard C-21 or C-22 casing hanger. Additionally, the Sentry C-22 casing spool product line has been designed with the option to integrate full sets of lock-down screws (LDS) in the upper flange in order to provide mechanical casing hanger retention.
- The C-22 casing spool is designed for light to intermediate casing string weights
- It incorporates a straight bowl design
- Is available with Lock Down Screws(LDS) in the upper flange for mechanical casing hanger retention
- Has flanges on both the top and bottom of the assembly
- Has a seal area in the bottom flange for a secondary seal between the casing annulus and the flanged connection
- Incorporates a test port in the lower flange to accommodate secondary seal testing.
Bowl | Top Flange | WP | Bottom Flange | WP | Outlet Size | PSL Levels | Material Class |
C-22 | 11″ | 3K, 5K, 10K, 15K | 11″ | 3K, 5K, 10K, 15K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-22 | 11″ | 3K, 5K, 10K, 15K | 13-5/8″ | 3K, 5K, 10K, 15K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-22 | 13-5/8″ | 3K, 5K, 10K | 16-3/4″ | 3K, 5K, 10K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-22 | 16-3/4″ | 5K,10K | 18-5/8″ | 5K, 10K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-22 | 13-5/8” | 3K | 20-3/4″ | 3K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-22 | 13-5/8” | 3K, 5K | 21-1/4″ | 3K, 5K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-29 Casing Spools
C-29 casing spool has all of the same features and benefits as the C-22, but is designed for intermediate to extreme casing weights. This head design can also handle the standard C-21 and C-22 casing hangers.
- The C-29 casing spool is designed for intermediate to extreme casing string weights
- It incorporates a straight bowl design
- Is available with Lock Down Screws (LDS) in the upper flange for mechanical casing hanger retention
- Has flanges on both the top and bottom of the assembly
- Has a seal area in the bottom flange for a secondary seal between the casing annulus and the flanged connection
- Incorporates a test port in the lower flange to accommodate secondary seal testing
Bowl | Top Flange | WP | Bottom Flange | WP | Outlet Size | PSL Levels | Material Class |
C-29 | 11″ | 3K, 5K, 10K, 15K | 11″ | 3K, 5K, 10K, 15K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-29 | 11″ | 3K, 5K, 10K, 15K | 13-5/8″ | 3K, 5K, 10K, 15K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-29 | 13-5/8″ | 3K, 5K, 10K | 16-3/4″ | 3K, 5K, 10K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-29 | 16-3/4″ | 5K,10K | 18-5/8″ | 5K, 10K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-29 | 13-5/8” | 3K | 20-3/4″ | 3K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |
C-29 | 13-5/8” | 3K, 5K | 21-1/4″ | 3K, 5K | LP or Studded | PSL 1 thru 3 | AA, EE, FF |