Journal of the Japanese Association for Petroleum Technology
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
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Volume 60, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • An efficient approach for simulation of kill
    Joe M. Kang, Seung Ihl Kam
    1995 Volume 60 Issue 3 Pages 199-209
    Published: 1995
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.60.199
    JOURNAL FREE ACCESS
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    A kick is one of the most dangerous and difficult problems in drilling operations. The methods for simulating kill operations to suppress a kick are classified into steady state, pseudosteady state, and fully transient analysis depending on calculation of the gas hold-up.
    Steady state analysis has been widely used in field calculation due to its simplicity and convenience. However, the effects of the formation cheracteristics, additional gas influx after well shut-in, and multiphase behavior in the annulus are not considered in steady state analysis. Fully transient analysis can describe kill operations with accuracy. However, fully transient analysis requires too much application time and it is known to be not effective method to simulate kill operations on the spot.
    In order to raise fleld availability of fully transient analysis, a new model is proposed in this study by combining fully transient analysis for the period prior to the kill mud injection and the pseudosteady state analysis for the period after the kill mud injection. To check the availability of the new model, it is compared with the Nickens model that makes use of the fully transient analysis. Results reveal that the two models are generally in good agreements if the difference of well configuration is compensated. The example results of Driller's method and Wait & Weight method are exhibited to show the validity of the new model. From the quantitative analysis of parameters, it is found that the pressure difference between the bottomhole and formation has strong influences on the annular pressures and then, has tendency to suppress the gas expansion. The effects of permeability and ROP i, e., rate of penetration) reveal that the volume of gas inflow before well stabilization determines pressures and the gas expansion after well stabilization.
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  • History matching studies of a coalbed methane gas reservoir
    Shinji Yamaguchi, Satoshi Akibayashi, Shumin Lin
    1995 Volume 60 Issue 3 Pages 210-217
    Published: 1995
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.60.210
    JOURNAL FREE ACCESS
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    This paper presents the history matching studies of a certain coalbed methane gas production well and the applicability of the numerical model developed by the authors to real field problems. Ten year future predictions on coalbed methane gas production from the history matched well suggested that stimulation of the well could increase cumulative gas production by 1.5 or 2.0 times.
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  • Produced-water treatment at El Bunduq oil field
    Mamoru Sakaino
    1995 Volume 60 Issue 3 Pages 218-227
    Published: 1995
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.60.218
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    One of the most important subjects accomplished in our production operations is the achievement made in handling produced water upstream of crude processing. Consequently, we have managed to achieve a stable production.
    The El Bunduq oil field is situated on the offshore boundary between Abu Dhabi (United Arab Emirates) and the State of Qatar in the Arabian Gulf. The crude oil is produced offshore and transported to Das Island which is 26km away from the Bunduq field. In 1983, oil production was resumed by water flooding under our secondary recovery. Since 1988, the water cut has been increasing considerably, and in order to overcome this problem, we installed a production separator for carrying out dehydration on the offshore platform. In 1990, a disposal well was drilled to be used for injecting the produced water into an aqueous formation. In 1993, we started to re-use an old redundant 16″ Main Oil Line to re-transfer the produced water from Das Island to offshore facilities for handling offshore. During 1994, while endeavoring to solve the problems related to produced water, we carried out a retrofit in the production separator and optimization of injecting emulsion breaker.
    As a result of our efforts, 99% of produced water is now handled offshore without any problems enabling us to maintain a plateau of oil production for the last seven years.
    In this paper, the following referred topics are related to produced water;
    (1) Maximization of crude oil recovery at crude processing plant
    (2) Decrease of operating pressure due to low well flowing pressure
    (3) Prevention of hydrate formation
    (4) Reduction of scale precipitation
    (5) Corrosion protection for downstream facilities
    (6) Working ratio
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  • A survey of recent developments of hydraulic fracturing technology
    1995 Volume 60 Issue 3 Pages 228-242
    Published: 1995
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.60.228
    JOURNAL FREE ACCESS
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