Drilling bit materials for an improved performance

by Montse Vilaseca, EURECAT

Drilling is a key technology enabling heat exchangers installation and plays an important role in the building industry, both in sedimentary as well as in rock drilling. Tools employed in drilling are known as drill bits, and are the responsible for mechanically penetrating and crushing the rock underneath them. The wear of drilling tools has always been a predominant factor for the costs of geotechnical engineering measures and hard rock excavation. This fact is not only related to material and personnel costs arising from drill bit maintenance and replacement but also because of the direct and negative impact of wear on the drilling performance of a worn drill bit. Improper selection of a bit results in lower penetration rates, fast wearing of the teeth and frequent bit changes, which results in higher drilling costs overall.

Drilling is a key technology enabling heat exchangers installation and plays an important role in the building industry… Improper selection of a bit results in lower penetration rates, fast wearing of the teeth and frequent bit changes, which results in higher drilling costs overall.

During the first year of GEOFIT project representative tools from vertical and horizontal drilling operations (needed in the different pilots of the project) have been selected and provided by CDP after their end life. For vertical drilling, down to the hole hammer and drag bits have been studied. For horizontal drilling, tricones (crushers) have been selected. Drill bit materials and main damaging mechanisms have been characterized and identified in Eurecat aiming to select alternative materials and solutions in order to:

    • reduce drilling times
    • improve rate of penetration (ROP)
    • improve abrasion and chipping/spalling resistance of drill bits

 

Figure 1. Analysed drill bit.

 

Drill bit inserts are commonly made with cemented carbides (also named hardmetal, cermets or cemented carbides), which are sintered composite materials consisting of two phases called hard phase (WC) and binder phase (Co). This combination of hardness and toughness makes WC-Co a successful material in drill bit inserts. However, the mechanical properties of the material are strongly dependent on composition and structure. A high Co content gives a tough material and high WC content gives a hard but brittle material. In addition, WC grain size and carbon content affect the properties.

Cemented carbide buttons are inserted and/or soldered into holes of a steel tool body. Taking into account the main damage mechanisms identified in hard metal buttons of drill bits for GEOFIT project and looking into recent publications and developments, advanced alternative hard metal grades have been selected to improve their tribo-mechanical properties based on (i) varying the grain size of the hard phase and the binder content, named Dual properties (DP) and (ii) macro gradients of Co-migration. In the same manner alternative steels with high strength, high wear resistance, good toughness and good dimension stability specially designed for drilling applications have been selected. These alternative hard metal and steel grades are being systematically tested in Eurecat laboratory in order to obtain a classification of their tribological behavior (friction and wear resistance).

Wear tests have been designed in order to reproduce the same damaging mechanisms observed in drilling tools. Cemented carbide discs are slid against quartz and other abrasives used as counter parts. Quartz content of rock is one of the main geomechanical parameters influencing wear of drill bits. Test conditions (pressure, speed and time) have been adjusted until the same wear mechanisms have been obtained. Figure 2 compares surface of drill bit button from a tool and of a wear scar obtained in the lab, in both cases surface cracks, carbides deformation and adhesion of ore material are identified.

Figure 2. Scanning electron microscopy images (10,000 X magnification) of surfaces from a) worn drill bit button and b) wear scar from laboratory test.

 

Taking into account the main damage mechanisms identified in hard metal buttons of drill bits for GEOFIT project, advanced alternative hard metal and alternative steels grades have been selected to improve their tribo-mechanical properties and are being systematically tested in Eurecat laboratory in order to obtain a classification of their tribological behavior (friction and wear resistance).

Main results obtained in laboratory wear tests are:

    • Coefficient of friction: describes the interaction between drill bit material and rock material.
    • Wear rate: which is the worn drill bit material volume per sliding distance and applied force. Is obtained measuring wear scars (see Figure 3).

These are valuable parameters which are used to feed tool wear models that will predict tool live, models under development by LTU in the framework of GEOFIT project.

Figure 3. Wear scar topographic images corresponding to different grades of hard metal after wear tests under the same conditions (applied force, speed and time): G3 presents higher volume loss.

Third General Assembly in Vienna

From the 7th to the 9th of May the GEOFIT consortium gathered in Vienna to hold their third general assembly. The meeting was organised by AIT (Austrian Institute of Technology) in their premises located in Giefinggasse, which also put together a traditional Austrian dinner in the city centre for all partners to enjoy the food and carry on discussing emerging ideas.

Significant progress were made regarding the core hardware technology to be installed on the pilot sites during this three-day meeting. Very important decisions were made on the coordination of work packages. 

Highlights included the management of data gathering and analyses from the pilots’ hardware implementation, and reviewing the advances made regarding the advances on the overall system and building integration for efficient management.

AIT also organised a visit to their impressive lab premises where all partners could see by themselves the prospective advances that can be reached in geothermal energy development. The building itself had implemented energy efficient tools that help reduce energy consumption.

On top of the general assembly a very interesting stakeholder workshop was held on the 8th May with participation from AIT -that was also the organiser- GROEN, CDP and Uponor were all partners participated. 

The consortium closed the meeting  having established clear goals for the next 6 months and looking forward to the work ahead.

Progress on demonstration activities

by Gisela Soley, from COMSA

The enhanced geothermal systems that are being developed under the GEOFIT project will be installed in 5 pilots located in 4 different countries covering the following scenarios: urban retrofitting, rock drilling and seismic retrofitting.

Since the start of the project, demo sites’ owners have been providing information to the technical partners in order to start the development of the most appropriate designs in terms of energy efficiency and integration within the existing building. Good understanding of the current situation is mandatory and following the IDDS (Integrated Design and Delivery Solutions) methodology through workshops with local stakeholders and partners involved and monthly calls has allowed determining the type of drilling (vertical, horizontal or excavation) and ground heat exchangers, and type of heat pump (electrically-driven developed by OCHSNER or hybrid developed by FAHRENHEIT) to be installed, as well as proposing innovative heating and cooling distributions systems for the different scenarios.

Below are detailed some of the technologies that have already been agreed in three of the pilots and also explained the constraints encountered up to now in the other two.

Pins del Vallès School in Sant Cugat (ES). The power needed is about 100 kW, so it has been estimated that 19 boreholes of 120 m deep are required. Besides improved vertical drilling, Horizontal Directional Drilling (HDD) will be performed (several alternatives have been analysed by CDP as shown in the picture below). The heat pump is being developed by OCHSNER and technical specifications and tests are being carried out in AIT labs. In principle, the heat pump will be used for heating 3 buildings (administrative, primary school and sports pavilion) and passive cooling has been proposed for the administrative one.

Sant’Appollinare offices in Perugia (IT). The office building for demonstration activities is placed in the Sant’Appollinare Medieval Fortress and its heating and cooling demand are about 16kW and 6kW respectively. As the loads are not very high it has been considered a good pilot to install horizontal ground heat exchangers and optionally, coiled slinky ones, and a hybrid configuration for the heat pump that is being developed by FAHRENHEIT and tested in CNR ITAE labs. This building has floor heating as heating distribution system and it has been proposed to refrigerate the offices by free-cooling.

Kingfisher swimming pool in Galway (IE). In this building there is CHP and two gas boilers. The two gas boilers cover the heating demand during the night; so apparently, the best solution will be to replace these two boilers by the ground source heat pump. This pilot is still under decision with regards to number of boreholes needed and capacity of the heat pump, but it has been agreed that improved vertical drilling will be performed and that OCHSNER will manufacture an electrically-driven heat pump as heating demand is quite high.

University building in Bordeaux (FR). In the last weeks, a new building on the ENSAM campus in Talence has been proposed after facing some technical and administrative constraints with the initial Nobatek office building demo site. The new building is being under study by the partners involved to see if it is suitable for shallow heat exchangers and for a hybrid heat pump system. The Consortium expects to have a clear picture of this pilot in the next general assembly taking place in May.

Residential building in Aran Islands (IE). After the visit in Aran last January, where eight different houses were surveyed, the Consortium has to come to a decision concerning which house(s) will be selected for demonstration activities according to the heating systems installed, emitters, existing passive measures if any, drilling space, accessibility and internet connection. CFO is in contact with the householders in order to get their approval. What it is clear is that retrofitting measures (external insulation and low temperature heating system) must be considered in order to improve the thermal comfort as well as to ensure the efficiency of the geothermal system to be installed. In addition, it is being analyzed that the final retrofitting and geothermal system proposed have the broadest range of applicability in the Aran Islands.

In parallel, monitoring plan for each demo building is being elaborated in order to establish the baseline which will allow comparing and assessing the performance of the building before and after renovation. While weather stations are now operational in Sant Cugat in order to monitor indoor/outdoor conditions, we are pending of their installation in Galway and Perugia. Next step is to install heat and electricity meters so that the 1-year pre-intervention monitoring period can start in these three pilots. Once Bordeaux and Aran pilots are clearly determined, the team will proceed with the monitoring tasks.

 

Meet the pilots: Aran Islands

BY AVRIL NÍ SHEARCAIGH

The Aran Islands pilot site in this project is located on Árainn, the largest of the three Aran Islands on the west coast of Ireland. This pilot’s focus is based on residential buildings. The Killeaney Cottages, pictured below, were selected and invited to participate. Eight of the households here are interested in taking part in GEOFIT and having their current heating system replaced by a Geothermal heat pump.

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GEOFIT WORKSHOPS: Galway & Aran Islands

At the end of January we held two workshops in Ireland linked to two of our pilot sites, one located in Galway and the other in the Aran Islands. These pilot sites have different characteristics and represent different challenges for the demonstration of our project. In this post we will talk about the development of the workshops, as well as these two pilot sites, so that they can be better known.

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Workshop in Perugia

From November 21 to December 6, 2018, a workshop was held at the Perugia demonstration site with the following objectives: to establish a channel of communication with local stakeholders, define their needs and requirements, include them in the design and finally gather information on the existing building. The workshop was conducted mainly with people who are directly involved in the building.

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