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BAKER HUGHES - Drilling Fluids Reference Manual

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PRESSURE PREDICTION AND CONTROL<br />

Thus,<br />

where,<br />

ICP = RCP + SIDP<br />

Figure 12 - 14 “U” Tube Circulating With Choke<br />

ICP = initial circulating pressure<br />

RCP = reduced circulating pressure<br />

SIDP = shut-in drillpipe pressure.<br />

For our example,<br />

RCP = 900 psi<br />

SIDP = 500 psi<br />

ICP = 900 + 500 = 1400 psi.<br />

Closing Procedure<br />

If any of the previously discussed warning signs are observed and a flow (with pump off) is<br />

detected, the following generalized procedures should be initiated.<br />

Procedure for Closing Well In While on Bottom<br />

1. Position kelly so that tool joints are clear of sealing elements.<br />

2. Stop pumps, check for flow.<br />

<strong>BAKER</strong> <strong>HUGHES</strong> DRILLING FLUIDS<br />

REFERENCE MANUAL<br />

REVISION 2006 12-29

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