Conventional wellbore perforation techniques are designed to establish flow from the hydrocarbon-bearing reservoir through the cemented casing into the wellbore. The explosive force of shaped charges is focused and intensified into a small-diameter jet that penetrates the casing and cement into the reservoir rock. This process reduces reservoir rock porosity and permeability as metal and carbon debris are forced into the perforation tunnel, while very fine grain particles plug or reduce the pore throat size. As a result, it is necessary to perform time-consuming and costly post-perforation operations to minimize flow restrictions into the wellbore. Developing alternative perforation methods that reduce or eliminate formation damage could significantly boost production rates, cumulative production and overall economic returns. The research team led by Gas Technology Institute (GTI) has demonstrated, through the application of high-energy lasers to rock samples, that damage to permeability and porosity of the adjacent zones cannot only be reduced, but that near-hole permeability in a reservoir sandstone can be increased up to 171%. By applying this technique downhole, perforations and other directionally controlled completion and stimulation methods could be employed without damaging the reservoir. This paper presents the experimental methods and results of exposing sandstone, limestone, and shale rock samples to high-power laser beams. A grid pattern was applied to the rock samples from which acoustic velocity and permeability measurements in and near the perforated tunnel where taken. In addition, rock mineralogy and rock properties were analyzed before and after the test.


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    Titel :

    Well Perforation Using High-Power Lasers


    Beteiligte:
    Batarseh, S. (Autor:in) / Gahan, B.C. (Autor:in) / Graves, R.M. (Autor:in) / Parker, R.A. (Autor:in)


    Erscheinungsdatum :

    2003


    Format / Umfang :

    10 Seiten, 11 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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