Q:
15 bbl/hr of partial losses are recorded and there is no tubing in the well. If personnel fails to keep the hole full for 5 hours, what is bottom hole pressure reduction after 5 hours if the casing capacity is 0.035 bbl/ft and the current mud weight is 9.2 ppg?
Answer & Explanation
Answer: B) 1025 psi
Explanation: Total losses in the volume in five hours can be calculated by multiplying the partial losses with total time i.e. 15 × 5 = 75 bbl. The height of the 75 bbl of losses of mud can be calculated by dividing loss in volume/casing capacity = 75/0.035 ft = 2143 ft. Therefore, the hydrostatic loss = 0.052 ×2143 ×9.2 =1025 psi.
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