Prediction of well performance instability in thin layered reservoirs
conference paper
By using a full dynamic model for both the well and the near well reservoir, a large range of instabilities can be simulated. These instabilities include gas lift heading, severes slugging and compressibility effects. To simulate these types of fluctuations it is necessary to use an integrated dynamic model for the complete system. Using a constant productivity index to describe the inflow or using lift curves for the well are not sufficient to capture the dynamics. In this paper a well is described where reservoir-well interaction leads to unstable well behaviour. In order to investigate the cause for the unstable production a full dynamic model was developed for both the well and the near well reservoir. The simulation results are compared to field data of this well. The instabilities encountered at this well were explained by a combination of severe slugging in the well and the influence of the dynamics of the reservoir. The wellbore could act as a gas storage volume in which a pressure build up can take place. The well model used was a three phase dynamic models based of the drift flux formulation. For the reservoir basic single phase oil model was used to simulate a radial inflow. In the reservoir the compressibility of the oil is taken into account.
Topics
TNO Identifier
238836
Publisher
Society of Petroleum Engineers SPE
Article nr.
SPE 95835
Source title
SPE Annual Technical Conference and Exhibition, ATCE 2005, 9-12 October 2005, Dallas, TX, USA
Collation
7 p.
Pages
1629-1635
Files
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