Advanced Density Logging Tool

提出了一项研究计划，开发一种新型的测量地质地层体积密度的钻孔测井工具。该工具使用线性感应加速器（LIA）产生从地层散射的强x射线束。放置在加速器附近的探测器可以感知散射的光子，从而提供密度的直接测量。与其他密度测井工具相比，基于lia的系统具有明显的优势。由于其强度是放射性工具的50倍，因此LIA具有更高的灵敏度和/或测井速度，同时在处理和运输过程中提供更高的安全性。此外，它将更加坚固耐用，能够承受更高的工作温度（175℃），并且比其他x射线型测井工具便宜3倍，具有以下参数：(1)电子能量1MeV；(2)束流电流50ua；(3)直径10厘米；(4)造价5万美元。我们建议执行三个任务：(1)开发LIA系统设计，包括加速器，其电源系统和x射线转换器；(2)进行实验以评估和选择关键LIA组件；(3)开发x射线探测器系统的概念设计。第一阶段的成功将为第二阶段的实验室原型测井工具的开发提供坚实的基础。

A research program is proposed to develop a new and innovative type of borehole logging tool for measuring the bulk density of geological formations. This tool uses a linear induction accelerator (LIA) to generate an intense x- ray beam which is scattered from the formation. Detectors placed near the accelerator sense the scattered photons thereby providing a direct measure of density. LIA-base systems offer substantial advantages over other density logging tools. Because its intensity is 50X more than that for radioactive tools, the LIA facilitates higher sensitivity and/or logging speed while offering greater safety during handling and transport. Also, it will be more rugged, capable of higher operating temperatures (175oC), and 3X less expensive than other x-ray-type logging tool with the following parameters: (1) electron energy 1MeV; (2) beam current 50 uA; (3) diameter 10 cm and (4) cost $50,000. We propose to perform three tasks: (1) develop a LIA system design including the accelerator, its power system and an x-ray converter; (2) perform experiments to evaluate and select key LIA components and (3) develop a onceptual design for the x-ray detector system. Success in Phase I will provide a firm foundation for development of a laboratory prototype logging tool in Phase II.