Journal of the Japanese Association for Petroleum Technology
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
Volume 71, Issue 4
Displaying 1-3 of 3 articles from this issue
Article
  • Tatsuo Shimamoto
    2006 Volume 71 Issue 4 Pages 327-336
    Published: July 01, 2006
    Released on J-STAGE: November 30, 2007
    JOURNAL FREE ACCESS
    One-dimensional radial flow equations are equivalent to those of linear flow, which has hyperbolic function of permeability and porosity. In other words, if we consider the permeability and porosity variation for linear direction, we can represent the radial flow. To expand this idea to various types of inner and outer boundary shapes, we defined the S-function as “the function of permeability and porosity for radial-direction which should be used for radial composite model to reproduce the pressure transient behavior of particular outer and inner boundary shapes”. The pressure behavior of radial composite model includes all the type of pressure curves. For example, one can realize any pressure transient behavior (channel type, sealing fault and hydraulic fractured well, etc) with radial model by assigning the permeability and porosity distribution along radial direction adequately. We found that the S-function can be easily estimated from the steady state stream function. The composite models with the S-functions reproduce “sealing fault”, “channel type”, “horizontal sink” and “the reservoir which has different transmissibility regions”. We compared the results with the conventional analytical model by commercial software (Kappa Saphir), and obtained excellent agreement. Not only its high novelty and expandability, but its calculation speed and visibility, this methodology (S-function) will be a powerful tool for pressure transient analysis.
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  • -The characteristics and sources of maker pumice beds-
    Atushi Urabe, Satoshi Yasui, Mitsuru Inaba, Kyoko Kataoka, Nobuyuki Ta ...
    2006 Volume 71 Issue 4 Pages 337-348
    Published: July 01, 2006
    Released on J-STAGE: November 30, 2007
    JOURNAL FREE ACCESS
    The Higashi-Niigata gas field is located in the coast to offshore area in the northern part of Niigata City, Niigata Prefecture, central Japan. The stratigraphy of the middle Pleistocene to Holocene strata is reexamined by the borehole data above 600 m depth. The strata are divided into the Shirone Formation and the Kanbara Group in descending order. The Kanbara Group is composed of alternation of conglomerate, sandstone and mudstone with diagnostic four pumice beds. These pumice beds are newly named as the Higashi-Niigata first pumice bed (HN-P1), the Higashi-Niigata second pumice bed (HN-P2), the Higashi-Niigata third pumice bed (HN-P3) and the Higashi-Niigata forth pumice bed (HN-P4) in descending order. These pumice are probably reworked sediments derived from pyroclastic flow deposits which flowed in the Agano River. The HN-P1, HN-P2, HN-P3 and HN-P4 are respectively correlated to the Numazawako pyroclastic flow about 5ka, the Tagashira tephra about 130 ka, the Sunagohara-Kubota pyroclastic flow (Sn-KB) about 220 ka, the Sunagohara-Sakasegawa pyroclastic flow (Sn-SK) about 290 ka. As the result, the upper part of the Kanbara Group including the G4-layer which is the influential natural gas layer dissolved in water is estimated with the sediment about 18 ka to 300 ka.
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Lecture
  • Jose Castillo, F. Benitez, Y. Acasio, K. Regardiz, J. Rodríguez ...
    2006 Volume 71 Issue 4 Pages 349-362
    Published: July 01, 2006
    Released on J-STAGE: November 30, 2007
    JOURNAL FREE ACCESS
    This work presents an overview of the development strategic followed by Petróleos de Venezuela, S.A. (PDVSA) for the production of the heavy and extra heavy oil in the Orinoco Belt, in Venezuela. Also will be presented the result of a specific integrated study conducted in the larger reservoir (U2-3 MFB 53) located in the Bare Field, in the Ayacucho area. The study consisted in the construction of a geostatistical model 3D, integrating the information of the different disciplines: geophysics, geology, petrophysics and production-reservoir engineering, which allowed the calculation of an OOIP of 5,935 MSTB with greater certainty. It was determined that the paleotopography of the basement controlled the process of sedimentation of the U2-3 basal sands, confirmed by the drilling of vertical wells and by means of the interpretation of the seismic 3D. This concept was applied to relatively undeveloped neighboring areas of the reservoir to identify new development opportunities. A dynamic model of this area was generated to evaluate cold production using horizontal and multilateral wells of long reach. Using the dynamic model, the optimum flowing bottom hole pressure to avoid the early production of gas was determined, in order to maximize the efficiency of the electrosubmersible and progressive cavity pumps. Based on this study, the first horizontal well (MFB-664) of long reach was drilled, which represent a record for PDVSA of 5,070 feet of horizontal section. The initial production for this well was 2,130 bopd. Other record was obtained in the drilling of the multilateral well MFB-667 (two branches) with an overall length of 8,260 feet; the initial production test was 1,820 bopd at minimal draw down. On the other hand, PDVSA also has developed innovative completions that improve recovery of heavy or extra heavy crude oil: Intelligent Completion, Selective Steam Injection Completion and Progressive Cavity/Sucker Rod Pump Optimization Systems
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