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

  • 13,500 ft Gas gradient
  • 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

+1 0

Responses

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

Post a comment