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Results
Self Consistent Approach to Construct Inflow Performance Relationship for Oil Well
Khasanov, Mars (Gazpromneft) | Krasnov, Vitaly (Rosneft) | Khabibullin, Rinat (Rosneft) | Musabirov, Timur (Rosneft)
Abstract This paper offers a new correlation to construct inflow performance relationship (IPR) for vertical oil well operated under solution gas drive with bottomhole pressure below the bubble poinr pressure. In this case an area with liberated free gas is created in the near-wellbore part of the reservoir. For this case a new functional equation (correlation) for IPR curve in the form of power law is suggested based on the analytical derivation and using pseudopressure function approach. In contrast to the other studies where a parametric IPR equation (usually in the polynomial form) with subsequent selection of coefficients (e.g. Vogel's methodology) was a priory used the new correlation is consistent with the fact of similarity between the oil wells IPR curves built in dimensionless coordinates. In particular case the IPR correlation considered is approximately close to the Vogel's IPR curve which allows using it as Vogel's simple alternative. A modification of the method is suggested. This modification corrects IPR curve behavior in the case of the presence of a transition zone where oil mobility decrease for the pressure values closed to the bubble-point pressure. The paper introduces the justification of the n exponent suggested by Fetkovich IPR and shows how application of new IPR correlation eliminates the contradictions associated with variation range of this parameter. Relations are also proposed to predict the future form of IPR curve and future values of the absolute open flow rate. Based on the large set of numerical calculations the expected values of exponent n for new IPR curve are presented thus they can be applied in the case studies when the experimental data are not available.
Inflow-Control-Device Design: Revisiting Objectives and Techniques
Daneshy, Ali (Daneshy Consultants International) | Guo, Boyun (University of Louisiana, Lafayette) | Krasnov, Vitaly (Rosneft) | Zimin, Sergey (Rosneft)
Summary Inflow-control devices (ICDs) were developed in response to early water breakthrough from the heel of prolific horizontal wells. In their initial applications, the design of ICD installations was based on equalizing flux (flow rate per unit length) along the length of a horizontal well, which required "choking" of flux in the heel region. In practice, these tools are often installed along the entire length of a horizontal well, with the logic that, because choking level is proportional to flow, the tool will automatically produce a more uniform flow profile. In this paper, we will re-examine the technical validity of equalizing flux along the length of the horizontal well. We will show that, in reservoirs with uniform permeability, the flux from the toe and heel regions should, in fact, be larger than that from the midsection. We will also show that delaying water or gas breakthrough is not the best reason for using ICDs. We will discuss the benefits of a new design philosophy whereby the well is segmented and choked at a level that regulates its flux to a value that produces a more-suitable flow for optimum reservoir management. This gives the operator the flexibility to design ICD layout to optimize various flow parameters, including time or cumulative production at water/gas breakthrough, location of first water/gas breakthrough, or any other parameter that fits the production strategy. This will be especially valuable for wells in variable-permeability reservoirs. A new design philosophy developed on the basis of this concept will be presented and its benefits demonstrated through a case history.
- Europe (1.00)
- Asia > Middle East (1.00)
- North America > United States > Louisiana (0.28)
- Asia > Russia > Siberian Federal District (0.28)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 054 > Block 31/6 > Troll Field > Sognefjord Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 054 > Block 31/6 > Troll Field > Heather Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 054 > Block 31/6 > Troll Field > Fensfjord Formation (0.99)
- (10 more...)