Field trials and physical modeling of wells with downhole water sink (DWS) completions have demonstrated controlled water coning and increased oil production rate. However, no field trials were long enough to show DWS potential in improving of oil recovery in comparison with conventional wells. Presented here are theoretical and experimental results from a DWS recovery performance study. The recovery study involved experiments with a physical model and computer simulations. The experimental results reveal that DWS dramatically accelerates the recovery process; a fivefold increase of the oil production rate was reached by adjusting the water drainage rate at the bottom completion. The results also show a 70% increase of oil recovery; from 0.52 to 0.88 for conventional and DWS completions, respectively. The computer-simulated experiments with commercial reservoir simulator demonstrate progressive improvement of recovery with downhole water drainage from 0.61 to 0.79 with no drainage and maximum drainage, respectively—a 24% increase of recovery factor, and a fivefold reduction of the time required to reach the limiting value of water cut, 0.98. However, the accelerated recovery process with DWS requires a substantial, up to 3.5-fold, increase of total water production. The simulation experiments also show that the main advantage of using DWS is its flexibility in controlling the recovery process. For conventional completions, recovery could be slightly increased by reducing production rates and largely increasing production times. For DWS, a combination of the top and bottom rates could be optimized for maximum recovery and minimum production time.

References

References
1.
Wojtanowicz
,
A. K.
,
Xu
,
H.
, and
Bassiouni
,
Z. A.
,
1991
, “
Oilwell Coning Control Using Dual Completion With Tailpipe Water Sink
,”
Proceedings of the SPE Production Operations Symposium
, Oklahoma City, OK, Apr. 7–9,
SPE Paper No. 21654
. 10.2118/21654-MS
2.
Wojtanowicz
,
A. K.
, and
Xu
,
H.
,
1992
, “
A New In-Situ Method to Minimize Oilwell Production Water-Cut Using Downhole Water Loop
,”
Proceedings of the 43rd Annual Technical Meeting of the Petroleum Society of CIM
, Calgary, AB, Canada, June 7–10, Paper No. CIM 92-13.
3.
Wojtanowicz
,
A. K.
, and
Shirman
,
E.
,
1996
, “
An In-Situ Method for Downhole Drainage–Injection of Formation Brine in a Single Oil-Producing Well
,”
Deep Injection Disposal of Hazardous and Industrial Wastes
,
J. A.
Apps
, and
C.-F.
Tsang
, eds.,
Academic
,
New York
, pp.
403
420
.
4.
Shirman
,
E. I.
,
1996
, “
A Well Completion Design Model for Water-Free Production From Reservoirs Overlaying Aquifers
,”
Proceedings of 1996 SPE Annual Technical Conference and Exhibition
, Denver, CO, Oct. 6–9, pp.
853
860
.
5.
Shirman
,
E. I.
, and
Wojtanowicz
,
A. K.
,
1997
, “
Water Cone Hysteresis and Reversal for Well Completions Using the Moving Spherical Sink Method
,”
Proceedings of 1997 Production Operations Symposium
, Oklahoma City, OK, Mar. 9–11,
SPE Paper No. 37467
, pp.
611
616
. 10.2118/37467-MS
6.
Shirman
,
E. I.
, and
Wojtanowicz
,
A. K.
,
1997
, “
Water Coning Reversal Using Downhole Water Sink—Theory and Experimental Study
,”
Proceedings of 72nd Annual Technical Conference and Exhibition of SPE
, San Antonio, TX, Oct. 5–8,
SPE Paper No. 38792
. 10.2118/38792-MS
7.
Shirman
,
E. I.
, and
Wojtanowicz
,
A. K.
,
1998
, “
More Oil With Less Water Using Downhole Water Sink Technology: A Feasibility Study
,”
Proceedings of 73rd Annual Technical Conference and Exhibition of SPE
, New Orleans, LA, Oct. 27–30,
SPE Paper No. 49052
. 10.2118/49052-MS
8.
Swisher
,
M. D.
, and
Wojtanowicz
,
A. K.
,
1995
, “
New Dual Completion Method Eliminates Bottomhole Water Coning
,”
Proceedings of SPE Annual Technical Conference and Exhibition
, Dallas, TX, Oct. 22–25, SPE Paper No. 30697, pp.
549
555
.
9.
Swisher
,
M.
, and
Wojtanowicz
,
A. K.
,
1996
, “
In-Situ Segregated Production of Oil and Water—A Production Method With Environmental Merit: Field Application
,”
SPE Adv. Technol. Ser.
,
4
(
2
), pp.
51
58
.10.2118/29693-PA
10.
Bowlin
,
K. R.
,
Chea
,
C. K.
,
Wheeler
,
S. S.
, and
Waldo
,
L. A.
,
1997
, “
Field Application of In-Situ Gravity Segregation to Remediate Prior Water Coning
,”
Proceedings of 1997 SPE Western Regional Meeting
, Long Beach, CA, June 25–27,
SPE Paper No. 38296
, pp.
1117
1120
.10.2118/38296-MS
11.
Loginov
,
A.
, and
Shaw
,
C.
,
1997
, “
Completion Design for Downhole Water and Oil Separation and Invert Coning
,”
Proceedings of 72nd Annual Technical Conference and Exhibition of SPE
, San Antonio, TX, Oct. 5–8,
SPE Paper No. 38829
, pp.
70
73
.10.2118/38829-MS
12.
Hernandez
,
J. C.
, and
Wojtanowicz
,
A. K.
,
2005
, “
Qualification of Un-recovered Reserves Due Production Process Dynamics in Water-Drive Reservoirs
,”
Petroleum Society 6th Canadian International Petroleum Conference 2005
, Calgary, AB, Canada, June 7–9,
CIPC Paper No. 2005-237
. 10.2118/2005-237
13.
Hernandez
,
J. C.
, and
Wojtanowicz
,
A. K.
,
2005
, “
Prediction of By-passed Oil With Correlations in Side Water Drive Reservoirs
,”
Petroleum Society 6th Canadian International Petroleum Conference 2005
, Calgary, AB, Canada, June 7–9, CIPC Paper No. 2005-196.
14.
Hernandez
,
J. C.
, and
Wojtanowicz
,
A. K.
,
2006
, “
Assessment of Un-recovered Oil in Dipping Reservoirs From Analysis of Water Cut Development
,”
Petroleum Society 7th Canadian International Petroleum Conference 2006
, Calgary, AB, Canada, June 13–15,
CIPC Paper No. 2006-200
. 10.2118/2006-200
15.
Kimbrell
,
W. C.
, and
Wojtanowicz
,
A. K.
,
2006
, “
Enhancing Inactive Well Recovery Potential—A Case History
,”
Petroleum Society 7th Canadian International Petroleum Conference 2006
, Calgary, AB, Canada, June 13–15,
CIPC Paper No. 2006-177
. 10.2118/2006-177
16.
Wojtanowicz
,
A. K.
, and
Armenta
,
M.
,
2004
, “
Assessment of Downhole Water Sink Technology for Controlling Water Inflow at Petroleum Wells
,”
ASME J. Energy Resour. Technol.
,
126
(
4
), pp.
334
341
.10.1115/1.1831282
17.
Byrne
,
W. B.
, Jr.
, and
Morse
,
R. A.
,
1973
, “
The Effect of Various Reservoir and Well Parameters on Water Coning Performance
,”
Proceedings of the Third Numerical Simulation of Reservoir Performance Symposium of SPE
, Houston, TX, Jan. 10–12, SPE Paper No. 4287.
18.
Kuo
,
M. C. T.
, and
DesBrisay
,
C. L.
,
1983
, “
A Simplified Method for Water Coning Predictions
,”
Proceedings of the 58th Annual Technical Conference and Exhibition
, San Francisco, CA, Oct. 5–8,
SPE Paper No. 12067
. 10.2118/12067-MS
19.
Caudle
,
B. H.
, and
Silberberg
,
I. H.
,
1965
, “
Laboratory Models of Oil Reservoirs Produced by Natural Water Drive
,”
SPEJ
,
5
(
1
), pp.
25
36
.10.2118/984-PA
20.
Henley
,
D. H.
,
Owens
,
W. W.
, and
Craig
,
F. F.
, Jr.
,
1960
, “
A Scale-Model Study of Bottom-Water Drives
,”
J. Petrol. Eng.
,
13
(1), pp.
90
98
.10.2118/1539-G-PA
21.
Shirman
,
E. I.
,
1998
, “
Experimental and Theoretical Study of Dynamic Water Control in Oil Wells
,” Ph.D. dissertation, Louisiana State University, Baton Rouge, LA.
22.
Kurban
,
H.
,
1999
, “
Numerical Simulation of Downhole Water Sink Production System Performance
,” M.S. thesis, Louisiana State University, Baton Rouge, LA.
23.
Arslan
,
O.
,
White
,
C. D.
, and
Wojtanowicz
,
A. K.
,
2008
, “
Maximum Revenue for Oil Wells With Optimized Downhole Water Drainage
,”
J. Can. Pet. Technol.
,
47
(
5
), pp.
56
62
.
You do not currently have access to this content.