Research Papers: Petroleum Engineering

Enhancing Oil Recovery With Bottom Water Drainage Completion

[+] Author and Article Information
Ephim Shirman

Schlumberger, PTS,
16a bld 3 Leningradskoe Shosse,
Moscow 125171, Russia
e-mail: eshirman@slb.com

Andrew K. Wojtanowicz

Louisiana State University,
Baton Rouge, LA 70803
e-mail: awojtan@lsu.edu

Hilal Kurban

Chevron NA DWEP,
1500 Louisiana, Room 37-179,
Houston, TX 77002
e-mail: HKurban@chevron.com

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 29, 2013; final manuscript received September 20, 2014; published online October 21, 2014. Assoc. Editor: Arash Dahi Taleghani.

J. Energy Resour. Technol 136(4), 042906 (Oct 21, 2014) (7 pages) Paper No: JERT-13-1253; doi: 10.1115/1.4028691 History: Received August 29, 2013; Revised September 20, 2014

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.

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Fig. 1

Experimental model schematics

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Fig. 2

Oil recovery with DWS at various water drainage rates

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Fig. 3

An optimum DWS well production schedule (bottom/top rate ratio) gives maximum recovery

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Fig. 4

DWS rates cross-plot for reservoir model case-1

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Fig. 5

DWS rates cross-plot for reservoir model case-2

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Fig. 6

Experimental well production history shows no reduction of total water cut with DWS

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Fig. 7

DWS minimizes total water cut at rates below the ultimate rate (8 cc/min)

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Fig. 8

DWS well's oil recovery for different bottom water drainage rate and constant production rate, 15.9 CMPD (100 BPD)

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Fig. 9

Recovery factor for conventional and DWS wells

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Fig. 10

WOC profile shows more bypassed oil (at WC = 0.98) in conventional well (a) than DWS well (b)

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Fig. 11

DWS recovers more oil with total water cut higher than in conventional completion

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Fig. 12

High water production is trade-off for greater and faster recovery

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Fig. 13

Recovery comparison for DWS and conventional completions; total water cut limit is 99%




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