Horizontal wells productivity equation under pseudo-steady state (PSS) condition has long been used, while the shape factor (CA) parameter is still obtained from correlation of reported CA tables which are limited on few well and reservoir configurations and not yet verified. Most of the reported CA tables have significant error reaches 92% and overestimates well productivity 32%. Therefore, a comprehensive analysis was implemented and CAs were determined over a wider range of well and reservoir configurations by generalizing pressure transient model of . A new equation of primary pressure derivative (PPD) based on the generalized model was developed. Five pressure derivative functions (PPD, Slope of PPD, PPD × √TDA, Semi-log PPD (SPPD), Slope of SPPD) were evaluated and analyzed to identify five types of flow regimes (early radial, early linear, late radial, late linear, and PSS) for pressure test analysis. An efficient algorithm was achieved and accurate CAs and their correspondence pseudo-steady state time (TDA)PSS were computed and tabulated.

The results show that each of the five flow regimes has identification by a pair of the pressure derivative functions in spite of Slope of SPPD and Slope of PPD functions are considered one function.


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  1. Al Rbeawi, S. J. H., & Tiab, D.
    (2011, January1). Transient Pressure Analysis of Horizontal Wells in a Multi-Boundary System. Society of Petroleum Engineers. doi:10.2118/142316‑MS.
    https://doi.org/10.2118/142316-MS [Google Scholar]
  2. Bahadori, A.
    (2012, January1). Prediction of Skin Factor and Pseudo-Steady State Horizontal Wells Productivity for Various Drainage Areas. Society of Petroleum Engineers. doi:10.2118/156278‑MS.
    https://doi.org/10.2118/156278-MS [Google Scholar]
  3. Beshry, M. A., Krawchuk, P., Brown, G. A., & Brough, B.
    (2006, January1). Predicting the Flow Distribution on Total E&P Canada's Joslyn Project Horizontal SAGD Producing Wells Using Permanently Installed Fiber-Optic Monitoring. Society of Petroleum Engineers. doi:10.2118/102159‑MS.
    https://doi.org/10.2118/102159-MS [Google Scholar]
  4. Brown, G. A., & Tiwari, P.
    (2010, January1). Using DTS Flow Measurements Below Electrical Submersible Pumps to Optimize Production from Depleted Reservoirs by Changing Injection Support Around the Well. Society of Petroleum Engineers. doi:10.2118/135130‑MS.
    https://doi.org/10.2118/135130-MS [Google Scholar]
  5. Brown, G. A., Pinzon, I. D., Davies, J. E., & Mammadkhan, F.
    (2007, January1). Monitoring Production from Gravel-Packed Sand-Screen Completions on BP's Azeri Field Wells Using Permanently Installed Distributed Temperature Sensors. Society of Petroleum Engineers. doi:10.2118/110064‑MS.
    https://doi.org/10.2118/110064-MS [Google Scholar]
  6. Earlougher, R.C.Jr.
    : Advances in Well Test Analysis, Monograph Series, SPE, Dallas (1977) 5.
    [Google Scholar]
  7. Gringarten, A. C., Ramey, H. J., & Raghavan, R.
    (1974, August1). Unsteady-State Pressure Distributions Created by a Well With a Single Infinite-Conductivity Vertical Fracture. Society of Petroleum Engineers. doi:10.2118/4051‑PA.
    https://doi.org/10.2118/4051-PA [Google Scholar]
  8. Hagoort, J.
    (2009, December1). The Productivity of a Well with a Vertical Infinite-Conductivity Fracture in a Rectangular Closed Reservoir. Society of Petroleum Engineers. doi:10.2118/112975‑PA.
    https://doi.org/10.2118/112975-PA [Google Scholar]
  9. Haidar, A. M., Vafin, I., Borisov, G., Dzhabrailov, A., & Nikitin, A.
    (2008, January1). Formation Hydrofracturing Experience on Horizontal Wells of [email protected] NK Rosneft. Society of Petroleum Engineers. doi:10.2118/117418‑MS.
    https://doi.org/10.2118/117418-MS [Google Scholar]
  10. Huebsch, H. T., Moss, M., Trilsbeck, T. C., Brown, G. A., Rogers, S. J., & Bouchard, T.
    (2008, January1). Monitoring Inflow Distribution in Multizone, Velocity String Gas Wells Using Slickline Deployed Fiber Optic Distributed Temperature Measurements. Society of Petroleum Engineers. doi:10.2118/115816‑MS.
    https://doi.org/10.2118/115816-MS [Google Scholar]
  11. Issaka, M. B., & Ambastha, A. K.
    (1992, January1). Drawdown and Buildup Pressure Derivative Analyses for Horizontal Wells. Society of Petroleum Engineers. doi:10.2118/24323‑MS.
    https://doi.org/10.2118/24323-MS [Google Scholar]
  12. Leone, A., Galli, G., Drago, A., & Brown, G.
    (2015, September28). Characterizing Reservoir Thermofacies by Using Distributed Temperature Sensing Measurements. Society of Petroleum Engineers. doi:10.2118/175080‑MS.
    https://doi.org/10.2118/175080-MS [Google Scholar]
  13. Mattar, L.
    (1999, December1). Derivative Analysis Without Type Curves. Petroleum Society of Canada. doi:10.2118/99‑13‑63.
    https://doi.org/10.2118/99-13-63 [Google Scholar]
  14. Mattar, L., & Zaoral, K.
    (1992, April1). The Primary Pressure Derivative (Ppd) A New Diagnostic Tool In Well Test Interpretation. Petroleum Society of Canada. doi:10.2118/92‑04‑06.
    https://doi.org/10.2118/92-04-06 [Google Scholar]
  15. Mohammad AliAhmadi, RezaSoleimani, MoonyongLee, TomoakiKashiwao, AlirezaBahadori
    , Determination of oil well production performance using artificial neural network (ANN) linked to the particle swarm optimization (PSO) tool, Petroleum, Volume 1, Issue 2, 2015, Pages 118–132, ISSN 2405-6561, http://dx.doi.org/10.1016/j.petlm.2015.06.004.
    [Google Scholar]
  16. Mutalik, P. N., Godbole, S. P., & Joshi, S. D.
    (1988, January1). Effect Of Drainage Area Shapes On The Productivity Of Horizontal Wells. Society of Petroleum Engineers. doi:10.2118/18301‑MS.
    https://doi.org/10.2118/18301-MS [Google Scholar]
  17. Ozkan, E., & Raghavan, R.
    (1988, January1). Some New Solutions to Solve Problems in Well Test Analysis: Part 1 - Analytical Considerations. Society of Petroleum Engineers. SPE-18615-PA. Published in the 1991 SPE Formation Evaluation, Volume 6, Issue 3.
    [Google Scholar]
  18. Wood, P., Simpson, A., Holland, B., Brown, G. A., Rogers, G., Anderson, S., … Figueroa, M.
    (2010, January1). Monitoring Flow and Completion Integrity of a North Sea Subsea HPHT Appraisal Well During an Extended Well Test Using Permanently Installed Fiber-OpticTemperature Sensors. Society of Petroleum Engineers. doi:10.2118/137120‑MS.
    https://doi.org/10.2118/137120-MS [Google Scholar]

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