Tuesday, May 12, 2015

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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


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


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


Detect thermal neutron

Has one source and two detector

Can be used in either uncased or cased hole


Detect epithermal neutron

Has asingle detector

Can be used in open hole



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

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