Feasibility Study for the Geoprops ODP Probe: In-Situ Measurements of Physical Properties

Geoprops ODP 探针的可行性研究：物理特性的现场测量

• 批准号: 8715781
• 负责人: Daniel Karig
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-11-01 至 1989-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8715781&HistoricalAwards=false
• 关键词: Feasibility; Study; Geoprops; ODP; Probe

The quantification of all aspects of the geosciences is creating a growing demand for accurate measurements of such quantities as physical properties, mechanical state parameters, and chemical compositions. ODP holes are becoming increasingly recognized as important probes of environmental conditions as well as records of lithology. Various techniques are available for measurements of the desired quantities in ODP holes, but most of these have proved to be poor in sections of moderately consolidated sediments, which comprise an ever increasing percentage of footage drilled. At the JOI/USSAC workshop on Physical Properties in ODP, this concern was addressed and a recommendation a made to develop the Navidrill/Geoprops concept. In this concept, a 3 3/4" hole is drilled 5 m ahead of the main bit with a mud-motor drive core bit and barrel. This Navidrill assembly can be withdrawn on a sand line and Geoprops probe, an internally recording system with packers and an array of sensors, can be quickly placed in the small hole. A conservative initial design envisages measurements of temperature, pore pressure. permeability, stress orientation and pore fluid composition, but other measurements could be added if the concept is successful. Before construction of the Geoprops probe, a feasibility study is necessary to insure the need for and suitability of such an approach, to outline the scientific and engineering constraints, and to develop a general layout. This award will support such a study.

地球科学各个方面的量化对物理性质、力学状态参数和化学成分等数量的精确测量产生了越来越大的需求。ODP孔作为环境条件和岩性记录的重要探头，越来越受到人们的重视。目前有多种技术可用于测量ODP井中所需的量，但事实证明，大多数技术在中等固结沉积物中效果不佳，而中等固结沉积物在钻井进尺中所占的比例越来越大。在JOI/USSAC关于ODP物理特性的研讨会上，解决了这一问题，并提出了开发Navidrill/Geoprops概念的建议。在这个概念中，使用泥浆马达驱动的岩心钻头和钻管，在主钻头前方5m处钻出一个3 3/4”的孔。该Navidrill组件可以在砂线上取出，Geoprops探头是一种内部记录系统，带有封隔器和一系列传感器，可以快速放置在小孔中。保守的初始设计设想测量温度、孔隙压力。渗透率、应力方向和孔隙流体成分，但如果概念成功，还可以添加其他测量。在建造Geoprops探针之前，有必要进行可行性研究，以确保这种方法的必要性和适用性，概述科学和工程限制，并制定总体布局。这笔奖金将支持这样一项研究。