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    Simulating Multizone Fracturing in Vertical Wells

    Source: Journal of Energy Resources Technology:;2014:;volume( 136 ):;issue: 004::page 42902
    Author:
    Wang, Wei
    ,
    Dahi Taleghani, Arash
    DOI: 10.1115/1.4027691
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Numerous multizone multistage hydraulic fracturing treatments are now being executed in low permeability oil and gas fields around the world. Due to the limited access to the subsurface, posttreatment assessments are mainly limited to few techniques such as tiltmeter, microseismic, and tracerlogs. The first two techniques are mainly used to determine fracture extension; however, fracture height and fracture initiation at all perforation clusters could only be confirmed through radioactive tracer logs or detailed pressure analysis. In this paper, we consider real examples from a field from Central America and investigate potential problems that led to the limited generation of fractures in multizone treatments. For instance, some of the postfrac radioactive logs show very low concentration of tracers at some perforated zones in comparison with other zones. On the other hand in some cases, tracer logs indicate the presence of tracers in deeper or shallower zones. Different reasons could cause fracture growth in nonperforated zones, including but not limited to: perforation design problems, casing/cement integrity problems, lack of containment, instability of fracture growth in one or some of the zones, and finally making a mistake in selecting lithology for fracturing. In this paper, some of these issues have been examined for a few sample wells using treatment pressure data, petrophysical logs, and postfrac tracer logs. Some recommendations in designing the length and arrangement of perforations to avoid these problems in future fracturing jobs are provided at the end of this paper.
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      Simulating Multizone Fracturing in Vertical Wells

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    contributor authorWang, Wei
    contributor authorDahi Taleghani, Arash
    date accessioned2017-05-09T01:07:13Z
    date available2017-05-09T01:07:13Z
    date issued2014
    identifier issn0195-0738
    identifier otherjert_136_04_042902.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/154590
    description abstractNumerous multizone multistage hydraulic fracturing treatments are now being executed in low permeability oil and gas fields around the world. Due to the limited access to the subsurface, posttreatment assessments are mainly limited to few techniques such as tiltmeter, microseismic, and tracerlogs. The first two techniques are mainly used to determine fracture extension; however, fracture height and fracture initiation at all perforation clusters could only be confirmed through radioactive tracer logs or detailed pressure analysis. In this paper, we consider real examples from a field from Central America and investigate potential problems that led to the limited generation of fractures in multizone treatments. For instance, some of the postfrac radioactive logs show very low concentration of tracers at some perforated zones in comparison with other zones. On the other hand in some cases, tracer logs indicate the presence of tracers in deeper or shallower zones. Different reasons could cause fracture growth in nonperforated zones, including but not limited to: perforation design problems, casing/cement integrity problems, lack of containment, instability of fracture growth in one or some of the zones, and finally making a mistake in selecting lithology for fracturing. In this paper, some of these issues have been examined for a few sample wells using treatment pressure data, petrophysical logs, and postfrac tracer logs. Some recommendations in designing the length and arrangement of perforations to avoid these problems in future fracturing jobs are provided at the end of this paper.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSimulating Multizone Fracturing in Vertical Wells
    typeJournal Paper
    journal volume136
    journal issue4
    journal titleJournal of Energy Resources Technology
    identifier doi10.1115/1.4027691
    journal fristpage42902
    journal lastpage42902
    identifier eissn1528-8994
    treeJournal of Energy Resources Technology:;2014:;volume( 136 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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