• 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