Features of Logging-While-Drilling (LWD) in Horizontal Wells

Hansen, Randy R.; White, Jim

doi:10.2118/21989-ms

Cited by 13 publications

(3 citation statements)

References 1 publication

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“…The technical functionality with respect to memory and wireline operation, pressure and temperature resistance, and handling of all iMLS sondes was verified in the 4000 m deep test borehole of the KTB Depth Laboratory (Harms and Kück, 2020). The goal of the first full field utilization of the entire iMLS system was twofold: on the one hand, we aimed to check and improve the procedure that we had designed; on the other hand, we wished to examine the accuracy of the iMLS depth measurement method.…”

Section: Field Test and Resultsmentioning

confidence: 99%

New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling

et al. 2021

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Abstract. We established a cable-free memory-logging system for drill-string-deployed geophysical borehole measurements. For more than 20 years, various so-called “logging while tripping” (LWT) techniques have been available in the logging service industry. However, this method has rarely been used in scientific drilling, although it enables logging in deviated and unstable boreholes, such as in lacustrine sediment drilling projects. LWT operations have a far lower risk of damage or loss of downhole logging equipment compared with the common wireline logging. For this purpose, we developed, tested, and commissioned a modular memory-logging system that does not require drill string modifications, such as special collars, and can be deployed in standard wireline core drilling diameters (HQ, bit size of 96 mm, and PQ, bit size of 123 mm). The battery-powered, autonomous sondes register the profiles of the natural GR (gamma radiation) spectrum, sonic velocity, magnetic susceptibility, electric resistivity, temperature, and borehole inclination in high quality while they are pulled out along with the drill string. As a precise depth measurement carried out in the drill rig is just as important as the actual petrophysical downhole measurements, we developed depth-measuring devices providing a high accuracy of less than 0.1 m deviation from the wireline-determined depth. Moreover, the modular structure of the system facilitates sonde deployment in online mode for wireline measurements.

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Section: Field Test and Resultsmentioning

confidence: 99%

New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling

et al. 2021

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“…Initially, this technique was developed to provide a near real-time measure of downhole drilling trajectory and thus allow the steering of the bottom-hole assembly (directional drilling). Nowadays, the technique has been developed to record a variety of downhole parameters and is referred as logging while drilling (LWD) (Hansen and White, 1991).…”

Section: Borehole Based Measurement Techniquesmentioning

confidence: 99%

Energy from the earth - Deep geothermal as a resource for the future?

Hirschberg¹,

Wiemer²,

Burgherr³

2014

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Geothermal energy offers the prospect of supplying base-load power in a decentralized fashion, while remaining heat can be used in district heating networks or industrial processes. No electric power is currently generated from deep geothermal energy sources within Switzerland that is available to end consumers -despite the large resource potential. Résumé LV Options technologiques fondamentalesLes ressources conventionnelles disponibles sous forme de chaleur souterraine (autrement dit hydrothermales) reposent sur l'interaction de trois facteurs :The project benefited from the support of the Swiss Federal Office of Energy (SFOE). Finally, the study would not have been possible without huge in-kind contributions by its authors and their home organizations.

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“…EcoScope (Figure 1) is a multifunction Logging-While-Drilling (LWD) tool developed for oilwell drilling applications (Hansen & White, 1991). It is typically used in conjunction with other LWD equipment during the drilling phase of oil and gas extraction.…”

Section: Introductionmentioning

confidence: 99%

Data-Driven Fault Detection for Neutron Generator Subsystem in Multifunction Logging-While-Drilling Service

et al. 2018

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This paper presents a method for constructing a health indicator to detect neutron-generator faults in a multifunction logging-while-drilling (LWD) service and predict maintenance requirements due to wear. The method is based on extracting fetures from selected channels that hold information about the subsystem degradation with time. These features are used to build a decision-tree model which estimates the tool condition from the recorded data. The model demonstrates excellent value for both maintenance and field engineers due to the fact that in just a few minutes the physical condition of the neutron generator can be determined with high confidence. This work is part of a long-term project with the aim to construct a digital fleet management for drilling tools.

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Features of Logging-While-Drilling (LWD) in Horizontal Wells

Cited by 13 publications

References 1 publication

New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling

New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling

Energy from the earth - Deep geothermal as a resource for the future?

Data-Driven Fault Detection for Neutron Generator Subsystem in Multifunction Logging-While-Drilling Service

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