BEAN-UP RULES OF THUMB
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Transcript of BEAN-UP RULES OF THUMB
• Bean-up guidelines are formulated as quantitative conditions which are imposed on the following parameters of bean-up procedure:
Tc - time of choke opening;
Tb - time between choke changes;
TT - total time of bean-up;
pDD - total drawdown;
p - incremental drawdown;
N = pDD /p - total number of steps;
Time
Choke size
TTT c
pBHP
Tb
pDD
“BEAN-UP RULES OF THUMB”QUALITATIVE BEAN-UP GUIDELINES
• Bean-up with a smaller incremental drawdown and short time between choke changes is superior to the one with a higher incremental drawdown but a longer “waiting” time between choke changes;
• Continuous bean-up is better than a step-wise one;
• Bean-up inflicted skin is more sensitive to a higher total drawdown rather than to a shorter total bean-up time;
• Bean-up with the same DD can be performed faster for the reservoirs with higher permeability, lower viscosity, and lower compressibility;
• Vertical wells can be beaned-up faster than horizontal ones;
• The higher completion skin, the lower bean-up-inflicted formation skin, other parameters (DD & bean-up time) being equal.
QUANTITAVE ESTIMATION of BEAN-UP-INFLICTED DAMAGE
Fines mobilization Formation failure
by transient flow ratesConcentration of damaging fines from grain size analysis
yes no
Critical flow rate (pressure grad) & permeability impairment from
coreflood test
exit
Permeability impairment and damage radius calculation vs DD
& bean-up time
Formation skin (soft & hard) calculation
as a function of DD and bean-up time
Failure criterion from core test and/or
data & grain size analysis
Tensile & compressive failure by transient flow rates vs DD & bean-up
time
Sizing of SC design
SC Non-SC
Transient sand production
prediction and quantification