Neutron log
Well logging measurement Neutron log
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| القياسات التى تتم عن طريق النيوترون اثناء تسجيلات الابار |
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 a porosity logging tool which depends 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 by shale
theory
Neutron are electrically neutral particles with a mass approximately equal to that of a hydrogen atom
High-energy neutrons are emitted from the chemical source
The neutrons collide with a 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 the thermal state
A few microseconds after being released, the neutron has lost significant energy and enter the thermal state
When in the thermal state, the neutron is captured by the nucleus 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 a ratio of near-to-far detector counts to determine porosity
Sidewall neutron tools detect epithermal neutrons and have less matrix effect
The type of neutron 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
Determine the amount of liquid filled the zone
Can be used in combination with neutron 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
القياسات التى تتم عن طريق النيوترون اثناء تسجيلات الابار