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Critical rate for 3-D Coning

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					Estimating the critical rate for 3-D Coning

qco = k Dr [(hoil)2 – (hwell)2] / [moil ln(re/rw)]
Input                                                                          Effect of Barrier R
Permeability, k, md                                 1000
Density difference, Dr, g/ml                          0.3
                                                                       6
Height of oil zone, hoil, ft                           50
Completion height in the oil zone, hwell, ft           10
Oil viscosity, moil, cp                                 1              5
External drainage radius, re, ft                     400
Wellbore radius, rw, ft                               0.4
                                                                       4




                                                            qc / qco
RESULT
Critical rate, qco, BPD                           159.89               3


                                                                       2
Effect of a horizontal barrier on the critical rate
                                                                       1
qc = qco [ln(re/rw)]/[ln(re/rb)]                                           0

Input
Critical rate before gel treatment, qco, BPD       159.9
External drainage radius, re, ft                     400
Wellbore radius, rw, ft                               0.4
Radius of gel barrier, ft                              20

RESULT
Critical rate after gel, qc, BPD                  368.68


Calculations
                             Barrier radius, ft qc/qco
                                           0.40         1
                                           0.60      1.06
                                           0.90      1.13
                                           1.35      1.21
                                           2.03      1.31
                                           3.04      1.42
                                           4.56      1.54
  6.83   1.70
 10.25   1.89
 15.38   2.12
 23.07   2.42
 34.60   2.82
 51.90   3.38
 77.85   4.22
116.77   5.61
           This is Muscat's model. Other models can be used instead.

Effect of Barrier Radius on Critical Rate




         Series1




    20         40         60        80      100   120
                   Barrier Radius, ft

				
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posted:11/19/2011
language:English
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