Borehole logging in investigations of slope deformations (original) (raw)
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2015
Temperature gradient drilling has historically been a key tool in the exploration for geothermal resources in the Great Basin, USA, but regulatory, environmental, and accessibility issues, as well as the expense of drilling, are increasingly limiting its use. In cases where thermal groundwater is not overlain by near-surface cold aquifers, it is possible to augment temperature gradient drilling with temperatures measured from a 2-meter depth. We discuss the development of a rapid, efficient, and portable 2-meter-deep temperature measurement system that obtains accurate temperatures within an hour of emplacing hollow steel probes into the ground, making it possible to map results on a daily basis so that temperature surveys can rapidly vector towards thermal anomalies. As an example, a thermal anomaly related to a 60 m (200 ft) deep thermal aquifer at the Desert Queen geothermal area, near Desert Peak, Churchill County, Nevada, USA was mapped in much greater detail with 2-meter-deep ...
Construction of a probe for measuring temperature and pressure in deep wells
Geothermics, 1980
As part of the Energy Research & Development Programme of the European Economic Communities (EEC), the National Electric Authority (ENEL), with a financial contribution from the EEC,* carried out an optimisation study of the instrumentation and techniques used in geothermal measurements.
Development of a high-temperature diagnostics-while-drilling tool
2009
This report documents work performed in the second phase of the Diagnostics While-Drilling (DWD) project in which a high-temperature (HT) version of the phase 1 low-temperature (LT) proof-of-concept (POC) DWD tool was built and tested. Descriptions of the design, fabrication and field testing of the HT tool are provided. Background on prior phases of the project can be found in SAND2003 2069 and SAND2000-0239. critical to the success of the program in general. The entire Geothermal Research Department at Sandia contributed to the completion of the Joule milestone. The field tests would not have come to fruition without the support of a large number of suppliers and contractors, and a hearty "thanks" is extended to all those who supported this effort. Lastly, this demonstration would not have been possible without the cooperation of ORMAT, who not only allowed an interruption of their drilling activities but also enthusiastically supported our efforts during the conduct of this test.
Proceedings of the …, 2007
Temperature gradient drilling has historically been a key tool in the exploration for geothermal resources in the Great Basin, USA, but regulatory, environmental, and accessibility issues, as well as the expense of drilling, are increasingly limiting its use. In cases where thermal groundwater is not overlain by near-surface cold aquifers, it is possible to augment temperature gradient drilling with temperatures measured from a 2-meter depth. We discuss the development of a rapid, efficient, and portable 2-meter-deep temperature measurement system that obtains accurate temperatures within an hour of emplacing hollow steel probes into the ground, making it possible to map results on a daily basis so that temperature surveys can rapidly vector towards thermal anomalies. As an example, a thermal anomaly related to a 60 m (200 ft) deep thermal aquifer at the Desert Queen geothermal area, near Desert Peak, Churchill County, Nevada, USA was mapped in much greater detail with 2-meter-deep measurements than possible with previous temperature gradient drilling, demonstrating that this technique can reduce the number of temperature gradient wells needed to identify zones of thermal upwelling.
Novel Instrument for Temperature Measurements in Borehole Heat Exchangers
IEEE Transactions on Instrumentation and Measurement, 2019
The thermal response test (TRT) is the standard method for characterizing the thermal properties of the ground and those of a borehole heat exchanger (BHE). During the TRT, the inlet and outlet temperatures of the BHE are monitored. However, this test typically considers the ground as a homogeneous, isotropic, and infinite media, and therefore, it only determines the bulk and effective parameters, such as effective thermal conductivity and thermal borehole resistance. Hence, the enhanced TRT protocols are necessary where the depthdependent temperatures are measured to estimate depth-specific thermal properties. Thus, a novel instrument with a data logger to automatically obtain the temperature measurements along the BHE is introduced. This device is based on a Zynq-7000 all programmable system on a chip. It has a dual-core central processing unit and a field-programmable gate array on one chip, thus providing a versatile architecture that reduces cost and improves efficiency in comparison with other systems of similar characteristics. This paper describes the implemented hardware and software developments that range from user interface application to a free-distribution operating system based on an embedded Linux. The proposed instrument can be easily incorporated throughout a TRT, and the nonspecialized staff can remotely manage or visualize the results through a menu-driven interface. The device is tested in a specific BHE installation and validated with standard Pt100-temperature-sensors. The results are comparable and, therefore, demonstrate the applicability of this novel instrument called Geowire. Index Terms-Borehole heat exchanger (BHE), embedded operating system, field-programmable gate array (FPGA), ground source heat pump (GSHP), open source, system on a chip (SoC), temperature profile, thermal response test (TRT).
Development of a Mud-Pulse High-Temperature Measurement-While-Drilling (MWD) System
2002
The overall program objective is to develop a mud-pulse measurement-whiledrilling (MWD) tool for oil and gas drilling operations that can be used where downhole temperatures are as high as 195ºC (383ºF). The work was planned to be completed in two phases: Phase I and an optional Phase II. Analysis of the economics of the 195ºC tool highlights the greatest obstacle to future commercialization. Costs to screen individual components, then subassemblies, and finally completed tools for high-temperature operations are very high. Tests to date also show a relatively short life for high-temperature tools-on the order of 300 hours. These factors mean that the daily cost of the tool will be higher (3 to 5 times more) than a conventional tool. Sperry Sun and the MWD industry have benefited from this program in the following areas: Pulser Improvements. Several improvements were implemented in "O" ring selection, oil selection, and other areas. Magnetometer and Calibration Improvements. Work on the magnetometer included upgrades to Sperry Sun magnetometers. This has led to improvements to the design of Sperry Sun's existing magnetometers, which will be beneficial across all directional work.-vi-Maurer Technology Inc.