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RESEARCH PAPERS

Modeling Formation Damage by Asphaltene Deposition During Primary Oil Recovery

[+] Author and Article Information
Shaojun Wang

Mewbourne School of Petroleum and Geological Engineering,  University of Oklahoma, T 301 Sarkeys Energy Center, 100 East Boyd St., Norman, OK 73019fcivan@ou.edu

Faruk Civan1

Mewbourne School of Petroleum and Geological Engineering,  University of Oklahoma, T 301 Sarkeys Energy Center, 100 East Boyd St., Norman, OK 73019fcivan@ou.edu

1

Corresponding author.

J. Energy Resour. Technol 127(4), 310-317 (Mar 24, 2005) (8 pages) doi:10.1115/1.1924465 History: Received September 21, 2004; Revised March 24, 2005

Asphaltene precipitation and deposition during primary oil recovery and resulting reservoir formation damage are described by a phenomenological mathematical model. This model is applied using experimental data from laboratory core flow tests. The effect of asphaltene deposition on porosity, permeability, and the productivity of vertical wells in asphaltenic-oil reservoirs are investigated by simulation.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic description of asphaltene precipitation and deposition mechanisms: (a) p>pp, asphaltene is dissolved in oil completely; (b) pp>p>pb, asphaltene precipitates from oil and deposits to pore surface and∕or plugs the pore throat; (c) p≈pb, asphaltene precipitates attain maximum, some deposits are reentrained into oil; (d) p<pb, some asphaltene precipitates are redissolved into oil, where p denotes the reservoir oil pressure, pb is the bubble-point pressure and pp is the onset of asphaltene precipitate pressure.

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Figure 2

Comparison of the simulated results with the experiment GF1 data of Minssiuex (13)

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Figure 3

Comparison of the simulated results with the experiment GV5 data of Minssiuex (13)

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Figure 4

Asphaltene precipitation curve

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Figure 5

Simulated reservoir oil-pressure profile at different production times for a vertical well

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Figure 6

Simulated reservoir oil asphaltene precipitate concentration profile at different production times for a vertical well

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Figure 7

Simulated reservoir rock asphaltene deposit profile in reservoir at different production times for a vertical well

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Figure 8

Simulated reservoir rock porosity profile at different production times for a vertical well

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Figure 9

Simulated reservoir rock permeability profile at different production times for a vertical well

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Figure 10

Simulated well productivity decline with production time for vertical wells

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