Annulars Hydril Gl Preventer

The 'GL' preventers are designed for both subsea and surface operations. Features of the 'GL' make it particularly useful for subsea and deepwater drilling.

Annular Hydril

Piston Indicator Hole Wear Plate

Packing Unit Latched Head

Opening Chamber Head

Opening Chamber Piston

Closing Chamber

Secondary Chamber (Balancing Chamber)

Figure 30 — Hydril 'GL' Annular Preventer

Piston Indicator Hole Wear Plate

Packing Unit Latched Head

Opening Chamber Head

Opening Chamber Piston

Closing Chamber

Secondary Chamber (Balancing Chamber)

k Cutaway View of 'GL' BOP shown in Midstroke. 5,000 or 10,000 psi bottom connections are available in hib, API flanged, or studded connection.

Figure 30 — Hydril 'GL' Annular Preventer

THE SECONDARY CHAMBER, which is unique to the GL BOP, provides greater flexibility of control hook-up. The chamber can be connected two ways to optimise operations for different effects:

  1. Minimise closing and opening volumes
  2. Reduce closing pressure
  3. 9.1 'GL' Control Hook-ups- Surface Operations

STANDARD SURFACE HOOK-UP

Secondary chamber connected to opening chamber (S>O).

This hook-up is considered standard for surface operations. It requires the least control fluid to close and thus results in the fastest closing time. The disadvantage of this system compared with the optional hook-up is that more pressure will be required to close the BOP.

OPTIONAL SURFACE HOOK-UP

Secondary chamber connected to closing chamber (S>C).

This optional control technique reduces the closing pressure by approximately 1/3 versus the standard hook-up. The disadvantage of this hook-up is that more closing fluid will be required.

Hydril Bop

AVERAGE CLOSING PRESSURE (psi) TO ESTABLISH SEAL OFF IN 'GL' BOPs FOR STANDARD SURFACE INSTALLATION* (Secondary Chamber to Opening Chamber)

TYPE 'GL' BLOWOUT PREVENTER SIZE

Pipe

13 5/8 - 5000

16 % - 5000

18 % - 5000

21 % - 5000

(ms)

Well Pressure (psi)

Well Pressure (psi)

Well Pressure (psi)

Well Pressure (psi)

2000

3500

5000

2000

3500

5000

2000

3500

5000

2000

3500

5000

7"

900

950

1100

700

825

950

700

825

950

640

780

925

5"

900

1000

1100

725

850

1000

800

900

1000

670

75

800

3 y2"

1200

1200

1200

800

925

1050

1000

1050

1100

Full Closure

1400

1500

1500

1400

1500

1500

1500

1500

1500

1500

1500

1500

* For optional surface hook-up (secondary chamber to closing chamber) multiply pressure shown above by 1' shown below.

GL 5000 psi

13 5/8"

16 %"

18 %"

21 V4"

1'

0.71

0.68

0.69

0.66

1' — ratio of closing chamber area to t This factor is used to adjust closing pr

ie sum of the closing chamber plus seconc essures for secondary chamber to closing c

ary chamber areas. hamber hook-up.

Well Control System Offshore

□ rillinq S Well Services Trai rnng

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