Video: Laboratory Testing and Prediction of Asphaltene Deposition in Production Wells
- Kosta J. Leontaritis (AsphWax, Inc.) | Efstratios Geroulis (AsphWax, Inc.)
- Document ID
- Offshore Technology Conference
- Publication Date
- Document Type
- 2017. Copyright is retained by the author. This presentation is distributed with the permission of the author. Contact the author for permission to use material from this video.
- 5.2 Fluid Characterization, 7.2 Risk Management and Decision-Making, 4.2 Pipelines, Flowlines and Risers, 7 Management and Information, 4.3.4 Scale, 5.2.1 Phase Behavior and PVT Measurements, 7.2.1 Risk, Uncertainty and Risk Assessment, 4.2 Pipelines, Flowlines and Risers, 2 Well completion, 4.3.3 Aspaltenes, 5 Reservoir Desciption and Dynamics
- Production, Deposition, Well, Tubing, Asphaltene
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When during primary oil production the thermodynamic conditions within the well tubing lie inside the asphaltene deposition envelope (ADE) of the produced fluid, the flocculated asphaltene particles could start depositing on the tubing wall at a certain rate. The above causes a restriction in the tubing ID which results in loss of production. Higher choke settings are required to maintain the same production level until the choke is fully open and the production losses cannot be compensated by opening the choke further. Eventually, the well may ″bridge″ and stop flowing completely or continue flowing at an extremely small flow rate in a rather ″burping″ way where the flow starts and stops at different time intervals on its own volition. Understanding when and how to intervene not only diminishes the risk of unsuccessful or, even worst, detrimental operations but also may increase the well’s productivity throughout its life.
This paper presents a methodology of first determining the ADE in the lab, along with the asphaltene particle size distribution as a function of pressure and temperature. Moreover, asphaltene deposition rates for the tubing conditions can be measured using high pressure and temperature coaxial cylinder technology. Utilizing this technique allows to quantify the amount of flocculated asphaltenes that will deposit under the expected conditions. From that data, it is illustrated how a well-equipped simulator can be, initially, tuned to predict the phase behavior measured in the lab along with the deposition rates. Finally, the simulator can then run the production scenarios available into the future, predicting the impact of asphaltene deposition in the tubing and the resulting loss of production and quantify the asphaltene deposit. It is apparent that this information can prove invaluable in the design of the well completion and flowline along with the facilities and help further refine the understanding of the expected production problems. This methodology is especially important in offshore satellite tieback wells expected to undergo asphaltene deposition.