Bottomhole Pressure When Circulating Out a Kick

Example: Use the following data and determine the bottomhole pressure when circulating out a kick:

Data: Total depth — RKB

• 0.12 psi/ft

Height of gas kick in casing = 1200 ft Original mud weight = 12.0 ppg

Choke line pressure loss = 220 psi

Annulus (casing) pressure = 631 psi

Original mud in casing below gas = 5500 ft

Step 1 Hydrostatic pressure in choke line:

Step 2 Hydrostatic pressure exerted by gas influx:

Step 3 Hydrostatic pressure of original mud below gas influx:

Kill weight mud = 12.7 ppg

Pressure loss in annulus = 75 psi

Water depth = 1500 ft

Step 4 Hydrostatic pressure of kill weight mud:

psi = 12.7 ppg x 0.052 x (13,500 — 5500 — 1200 — 1500 — 75) psi = 12.7 ppg x 0.052 x 5225 psi = 3450.59

Step 5 Bottomhole pressure while circulating out a kick:

 Pressure in choke line = 982.8 psi Pressure of gas influx = 144 psi Original mud below gas in casing = 3432 psi Kill weight mud = 3450.59 psi Annulus (casing) pressure = 630 psi Choke line pressure loss = 200 psi Annular pressure loss = 75 psi 8914.4 psi
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Responses

• dora
How to calculate the required kill weight mud for the following 12.7?
8 years ago
• Kathrin
What is Bottom hole circulating?
8 years ago
• John
What is the bottom hole pressure while circulating?
8 years ago
• cayla
When circulating out a gas kick?
5 years ago