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<< Click to Display Table of Contents >> Oil IPR Options: |
  
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<< Click to Display Table of Contents >> Oil IPR Options: |
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Oil IPR Options
The IPR is generated using Darcy's Law and the basic reservoir and fluid properties. This approach is valid for flow above the bubble point or for high water cut wells. This selection allows up to 5 independent zones.
Vogel's Method with Reservoir Data: The IPR is generated using Standing's extension to Vogel's original generalized IPR. The IPR is based on the reservoir and fluid data and combines Darcy's Law above the bubble point with Vogel type relationships below the bubble point. This selection allows up to 5 independent zones.
This approach uses a single rate test to generate an IPR with a constant productivity index above the bubble point with a Vogel type relationship below the bubble point. The reservoir pressure is required.
This approach solves Vogel's equation for two tests simultaneously to find the reservoir pressure and maximum flow rate. This option assumes the reservoir pressure is equal to the bubble point pressure.
Fetkovich from Multi-Point Test:
This approach fits multi-point test data to the empirical equation: 
, to determine the coefficient C, and the exponent n. The test may be a conventional flow after flow test, an isochronal, or a modified isochronal test. The minimum number of rates is 2 and the maximum is 10.
CONVENTIONAL FLOW AFTER FLOW TEST:
ISOCHRONAL TEST:
MODIFIED ISOCHRONAL TEST
The IPR is generated from the Fetkovich equation using a user-supplied coefficient and exponent, which are obtained from independent analysis of a multi-point test.
The IPR is generated from a user-supplied constant productivity index. This option is valid only for wells flowing above bubble point or for high water cut wells.
Constant Productivity Index from Fluid Level Data:
The productivity index is calculated from two flow rate tests and the corresponding fluid levels in the annulus. NOTE: The second through seventh options, which measure flowing bottomhole pressure in constructing the IPR curve, do not allow you to separately calculate the pressure drop across the completion since it is implicitly included in the pressure measured down stream from the completion.
Babu & Odeh Horizontal Well Model: This IPR model uses the method outlined by Babu and Odeh to model Horizontal well performance which includes the effects of position in the drainage area. Several simpler models are available but this one supersedes the capabilities of each of those.
Fractured Well Model:This IPR uses either the linear flow equation for very early time predictions or the quadratic equation with a modified rw for pseudo-radial flow during late times (tdxf > 0.016). Please refer to SPE monograph 12 RECENT ADVANCES IN HYDRAULIC FRACTURING pages 325-331 for a detailed discussion of the method. This is a transient model and is therefore dependent on time.
User Defined IPR Model: This IPR model allows entry of user input IPR parameters in case none of the above models adequat3ely describes the well behavior.