Page 262 - Formulas and Calculations for Petroleum Engineering

Production engineering formulas and calculations Chapter 4 255

Formula(s)

144 A a
C ¼
FL 5:615 ρ

Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1,
Page: 49.

4.113 Wellhead pressure (multiphase flow across the choke)
Input(s)

C: Emprical Constant (dimensionless)
n: Emprical Constant (dimensionless)
m: Emprical Constant (dimensionless)
R: Producing Gas Liquid Ratio (SCF/BBL)
S: Choke Size (1/64 in.)
q: Gross Liquid Rate (bbl/d)

Output(s)
P wh : Upstream Wellhead Pressure (psi)

Formula(s)

q
m
P wh ¼ C R
S n
Reference: Boyun, G., William, C., & Ali Ghalambor, G. (2007). Petroleum Production Engineering: A Computer-Assisted
Approach, Page: 5/64.

4.114 Workover operations (maximum allowed tubing pressure)

Input(s)
FG: Fracture Gradient (psi/ft)
P t : Tubing Pressure (psi)
H: Depth of Perforations (ft)

Output(s)
MATP: Maximum Allowable Tubing Pressure (psi)

Formula(s)

MATP ¼ FG H P t

Reference: Petrowiki.org.