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30. DIVERTER

30.1 FUNCTION

- Description

The Diverter is installed on the conductor pipe before drilling of first phase of the well and isdesigned to keep

personnel and Rig safe.It consist of an annular type blow out preventer and is designed to divert shallow gas away

fromthe well area while drilling surface hole.In doing so, the well remains open but diverting the pressure avoids

fracturing a formation.

- Manufacture specifications

Diverter system are manufactured according to API 16A and RP 64.The relevant ISO standard is the 13533 Spec.EN

requirements are defined by "Well control policy" and an internal specification.

30.2 TYPICAL CONFIGURATION

- Off-shore application (APIRP 64) Schematic arrangement foran off-shore application, asper API RP 64

recommendations.

- Hydril's suggested configurations

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- Hydril example with SXVspool arrangement

This integral type spoolwith diverter has theadvantage of remotecontrols, eliminating theuse of lateral valves.

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- SXV MSP Engineering Data

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-Typical configurationon Saipem's Rigs

Typical configurationon Saipem's mediumand high power Rigs

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- Diverter Installations

- Diverter valve

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30.3 TYPES AND CHARACTERISTICS

- Hydril MSP

The 29 " Diverter is the most commonlyused.It allows the running of 27" bit.For fast moving type Rigs, uses the

20"annular BOPThe MSP 29-1/2"-500 requires onlyclosing pressure. Seal off is effected by hydraulicpressureapplied to the closing chamber whichraises the piston, moving the packing unit radially inward into a sealing

engagement. Any normal closing unit having aseparate regulator valve for the annular BOP and sufficient accumulator

volumecan be used to operate the MSP.

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- Table Data

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- Table Initial Closing Pressure (psi)

Required for MSP 29-1/2-500 BOP / DIVERTER

Closing Pressure 500 PSI Wellbore

12" ipe 5" Pipe CSO

959 psi 1350 psi 1500 psi

30.4 INSPECTIONS

The Diverter System shall be inspected (modally and frequency) according to the manufacturer'srecommendations

and as per API RP 53.ENI requirements are defined by an internal specification.

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