Accuracy and borehole influences in pulsed neutron gamma density logging while drilling

被引：19
|
作者：
Yu, Huawei [1 ,2 ]
Sun, Jianmeng [2 ]
Wang, Jiaxin [1 ]
Gardner, Robin P. [1 ]
机构：
[1] N Carolina State Univ, Dept Nucl Engn, CEAR, Raleigh, NC 27695 USA
[2] China Univ Petr, Coll Georesources & Informat, Qingdao 266555, Shandong, Peoples R China
来源：
APPLIED RADIATION AND ISOTOPES | 2011年 / 69卷 / 09期
基金：
国家高技术研究发展计划(863计划);
关键词：
Logging-while-drilling; Pulsed neutron gamma density log; Inelastic gamma-ray; Monte-Carlo simulation; Borehole influence;
D O I：
10.1016/j.apradiso.2011.04.023
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
A new pulsed neutron gamma density (NGD) logging has been developed to replace radioactive chemical sources in oil logging tools. The present paper describes studies of near and far density measurement accuracy of NGD logging at two spacings and the borehole influences using Monte-Carlo simulation. The results show that the accuracy of near density is not as good as far density. It is difficult to correct this for borehole effects by using conventional methods because both near and far density measurement is significantly sensitive to standoffs and mud properties. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1313 / 1317
页数：5
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