A LOT at 10,000 ft with 10 ppg mud records the following volumes of fluid and pressures after pumping: 3 bbl, 600 psi; 4 bbl, 800 psi; 4.5 bbl, 900 psi; 5 bbl, 950 psi. If 100 psi was lost overcoming the mud gel strength, the formation fracture pressure is closest to:
This is the Guidebook example. It's also a fair question because it tests one's understanding of a LOT. One should have the needed page in a few seconds using the TOC under "LOT".
The hydrostatic pressure calculates to 5,200 psi, 900 psi is added, and 100 psi is subtracted making 6,000 psi. Simple and fast if you understand the process and have the equation. Just be prepared to graph it out on scratch paper.
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