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Petrophysicist or Petrophysical Eng

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  1. [1]
    م.أبويوسف
    م.أبويوسف غير متواجد حالياً

    عضو

    تاريخ التسجيل: Feb 2004
    المشاركات: 14
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    Petrophysicist or Petrophysical Eng

    salam alucom
    All
    I'd like here to give a brief talk about the above Petroleum Eng. type of work.
    Generally speaking the word Petrophysicist (PP) came to exist in 1950s when the Shell electrical Eng. Archie wrote a paper about calculating formation water saturation from resistivity. Indeed, he was the father of PPs. in general, PPs are those who seek to measure fluid and rock properties such as (porosity, permeability, saturation ......est.) form wireline or pipe convey measurement or cores. Mainly, there types of measurement are required so that PPs can do their job, electrical measurements, acoustic measurement and nuclear measurement.
    Basically, all the three types of measurement will give physical properties either for the rock or the fluid or the fluid being contained in the pore space in the rock and sometimes the mud used in drilling. For example, all resistivity typed tools are categorized in three main types, and these are: laterlog, Microresistivity and induction tool. Each type of these has certain limit and can be run in specific borehole environment such as type of mud, water base mud or oil based mud and the range of resistivity and Rmf/Rw ratio. I’ll continue the rest later

  2. [2]
    م.أبويوسف
    م.أبويوسف غير متواجد حالياً
    عضو


    تاريخ التسجيل: Feb 2004
    المشاركات: 14
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    Back again to our topic. Resistivity measurement gives an indication how easy the electric current can pass a certain formation, the measured resistivity is measured in ohm.m, now assume we have a container fill with brine (salt) water, the current will pass easy since salt water has N+ and Cl- as ions that convey that current, measured R will equal (in principle) the Rw (of water), once again assume that sand is being added to the container, so the measured resistivity will have different value from Rw by a factor, so R(assured)≠Rw but will equal to it with a factor called “formation factor “ so R(would be called Ro=F*Rw, now assume we add some oil and conduct the same experiment, the calculated R will be different than Ro by a factor since oil resist current passes, so R=I*Ro, where I is called the resistivity index. So now we can relate Rw & R(measured) from the above equation. … will be continued

    0 Not allowed!



  
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