EXPERT REPORT OF DR FREDERICK GENE BECK

Weatherford

REVISION A.2

DATE 1/25/2011

DOCUMENT No 0000446283

M45AP Flow-Activited Mid-Bore Auto-F1H Float Collar

NON-ROTATNGWIPERLOK

LANDING PLATE

AUTO-FILL TUBE

ASSEMBLY

NIGH DENSI1Y

3.4 SG 2.0 ODPHENOLIC BALL

235ID597 mm

45 368 mm diameter clearance

between lugs to catch .625W 41.25

mm diameter balls from above

CONCRETE

UPPER VALVEASSEMBLY

Aluminum

2.5OTubeOD

E3.S mm

219 Tube ID556 mm

LOWER VALVEASSEMBLY

Aluminum

FLOWPORTS2

1.93 49 mm BALLSEATP.D

Figure 11 Weatherford M45AP Float Collar Used In Macondo Well97

The Weatherford M45AP is an auto-fill type float collar Auto-fill

means that the check valve feature of the collar is held open while running

in the hole to automatically fill up the casing and to prevent increasing the

pressure on the formations to be cemented called surging the formation

which could fracture the formation and prematurely cause hydrocarbon

kick or lost circulation The Weatherford M45AP float collar used by BP

has phenolic resin auto-fill tube that holds two aluminum flapper-type

check valves in an open position Inside the auto-fill tube is high density

ball that is held in place at the top by three fingers and on the bottom by

Depo Ex 2582 at WFT-MDL00020470

65