Diverter System Surface
- 5.1 Function. When drilling top hole through the 30-inch casing, the riser may be employed enabling the use of weighted mud to provide overbalance if needed. Blowout preventers (BOPs) are not in place at this stage (see Section 2.14.1) because the 30-inch casing normally lacks sufficient pressure integrity to allow shut in. Therefore, if the well flows, the riser will direct that flow to the diverter system aboard the rig. Typically the diverter system includes an annular sealing device, means to both open the vent line and close the mud flowline, and a control system.
- 5.2. Location. Surface diverter systems on floating rigs are usually installed directly below the rotary table. The diverter unit is latched into a built-in housing. The upper flex/ball joint, which is the uppermost component in a marine drilling riser system, is usually mounted to the bottom of the diverter unit.
A subsea diverter stack may be installed on the wellhead to divert subsea.
2.5.3 Operation. API RP 64 provides Recommended Practices for Diverter Systems Equipment and Operations.
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