• Tuesday, May 12, 2015

    Well logging measurement Neutron log


    Neutron log

    Well logging measurement Neutron log

    Neutron tools measure the amount of hydrogen in the formation and relate it to porosity

    High hydrogen content indicates water or liquid hydrocarbons

    shale sedimentary rocks don't contain hydrogen in their composition

    or

    Is aporosity logging tool which depend on the presence of hydrogen which may be found in oil,water,gas or chemical composition of some rocks such as shale

    The neutron log is the most affected with shale


    theory

    Neutron are electrically neutral particles with mass approximately equal to that of ahydrogent atom

    High-energy neutrons are emitted from achemical source

    The neutrons collide with nucleus of the formation minerals in elastic-type collisions

    Neutron will lose the most energy when they hit something with equal mass such as hydrogen atom and enter in thermal state

    Afew microseconed after being released,the neutron have lost significant energy and enter the thermal state

    When in the thermal state,neutron are captured by the nucleis of other atoms

    The detector on the tool may detect epithermal neutrons or high energy gamma ray of capture

    Compensate neutrons tools detect epithermal neutrons and use aratio of near-to-far dectector counts to determine porosity

    Side wall neutron tools detect epithermal neutrns and have less matrix effect

    The type of netron logging tools


    (CNL(COMPENSATE NEUTRON

    Detect thermal neutron

    Has one source and two detector

    Can be used in either uncased or cased hole



    (SNP(SIDE WALL LOGGING TOOLS

    Detect epithermal neutron

    Has asingle detector

    Can be used in open hole

    (DNL(DUAL NEUTRON LOG

    (TDT(THERMAL DECAY TIME

    Neutron application

    Can be used to determine porosity

    Determin the amount of liquid filled the zone 

    Can be used in acombination with neutrone to determine saturation and lithology

    طريقه عمل تسجيل للابار عن طريق النيترون

    هى طريقه تستخدم لمعرفه كميه الهيدروجين الموجود داخل البئر ومن خلاله يمكن معرفه ماذا كان هذا البئر يحتوى على كميه كبيره من الماء او السوائل 

    ومن خلال ذالك يمكن مقارنتها بمساميه التربه ومعرفه مدى وجود مساميه فى التربه من عدمه