Forschung und Entwicklung

Drilling Facilities
Bo.Rex(Bochum Research and Exploration Drilling Rig, 2011)
The GZB's own mobile dual drive drilling rig in combination with a high pressure triplex pump allows for investigating and developing drilling methods as well as adapt drill tooling in a real case situation. Bo.Rex was developed in cooperation with its manufacturer based on the GZB specifications for a drilling depth of up to 1.000 m. Bo.Rex includes the mobile drilling rig, casings, toolings and drill rods. Bo-Rex can be complemented by:
  • High pressure pump (2011)
  • Mud cleaning and control unit (2014)
  • Auxiliary Equipment (crawler excavator, forkllift, telehandler)
In-Situ Testfield
The in-situ testfield of the GZB is located on the campus of the Bochum University of Applied Sciences and directly adjacent to the GZB Geotechnikum representing a test hangar with a workshop, preparation, core repository and experimental setups exceeding laboratory dimensions. The in-situ testfield represents a drill site of about 10.000 m² with existing research, observation and production wells and allows further drill tests and drilling to be carried out down to depths of 5.000 m – also in conjunction with the approved authorized 50 km² mining area "Future Energies". Currently, one research well (~500 m depths fully cored), 17 production wells and one monitoring well are available. Until summer 2016, the in-situ testfield will be complemented by a seismic and hydrogeological observatory comprising six borehole seismometers at depths of up to 200 m and three further monitoring wells. The seismic network will ensure permanent observation of natural as well as potential anthropogenic seismicity. Also, drilling can be interpreted as seismic source and can be used to develop a better understanding of the geological and geophysical structure of the subsurface. Hydrogeological monitoring wells will be used for field experiments such as flowmeter tests, pumping tests or chemical analysis of groundwater.
CT Evolution
The Coiled Tubing Drilling Evolution Initiative (CT Evolution, 2014) is a project by and for students at the GZB with the aim to develop innovative drilling technologies and peripheral equipment based on coiled tubing techniques. The fully mobile trailer-type Coiled Tubing Drilling Evolution Rig is used to evaluate the technical and economical perspectives of this drilling technology.
Borehole Logging Tools
The GZB owns the following equipment for geophysical borehole logging:
  • Acoustic Televiewer
  • Full wave form sonic
  • Deviation
  • Natural Gamma
  • Temperature / Conductivity
  • Flowmeter
  • Caliper
  • NIMO-T (Non-wired Immersible Measuring Object for Temperature)
(Enhanced) Geothermal Response Test (EGRT / TRT)
The equipment for (Enhanced) Geothermal Response Tests can be used for performance tests of geothermal probes in the field. The EGRT enables measuring of underground temperature regimes in small sections.
The Membrane Interface Probe in combination with a Gas Chromatograph with FID/DELCD for organic compounds is used for in-situ determination of low-volatile hydrocarbons (<200°C), temperature and electrical conductivity and allows on-site measurements of short-chained, chlorinated hydrocarbons (PCE, TCE, TCA) in loose rock. A semi-quantitative depth profile of the toxic elements can be inferred.
The In-situ Borehole and Geofluid Simulator (IBGS, 2015) represents a unique large scale test rig to physically simulate processes during exploration and exploitation of geogenic reservoirs and drilling under in-situ pressure and temperature conditions. The IBGS will comprise a system of three interacting modules:
  • Module A – IBGS Triaxial test rig
  • Module B – Drill Rig
  • Module C – Geofluid reactor
Large rock or material samples (up to 3 m in length) will be exposed to pressure and temperature conditions corresponding to depths of up to 5.000 m. Dimensioning and design of the IBGS allows for real-case simulations of drilling processes using mechanical, hydraulic or thermal drilling techniques while simultaneously applying drilling fluids, stimulation fluids and pore fluids under pressure. Acoustic, optical and thermal sensors along the rock sample permit a detailed documentation and analysis of the complex physical processes and interactions involved.
The THErmo-Triaxial In-situ testing System (THETIS, 2015) represents a triaxial test rig for deformation experiments on cylindrical rock samples under in-situ pressure and temperature conditions corresponding to more than 5.000 km depth (150 MPa confining pressure) and various pore pressure scenarios. The high axial pressure of up to 1 GPa allows for actual deformation until failure and thus full mechanical characterization of rocks relevant to Enhanced Geothermal Systems, such as granites. Electrical feedthroughs allow for mounting piezoelectric ceramics along the sample to monitor P- and S-wave velocities and acoustic emissions during deformation.
The High-temperature high pressure Equipment for CT scanning Of Rocks (HECTOR, 2013-2015) combines the capabilities of a state-of-the-art CT-scanner housing a Multifocus transmission tube (225 kV) with an advanced fluid pump system capable of applying pressures up to 50 MPa, temperatures up to 160°C and flow rates up to 200 ml/min to rock samples from the millimeter to the decimeter scale. Core holders for various sample sizes are placed inside the CT-scanner and connected to the fluid system. Two pumps produce a hydrostatic pressure, while another system of two pumps provide constant pore fluid flow or constant pore fluid pressure. Moreover, the corrosion-resistant pore fluid system allows for investigating highly aggressive fluids, such as brines, and their interactions with the solid rock matrix including the high-resolution visualization of precipitation and dissolution processes.
The ICP-OES determines metals and heavy metals in liquids such as groundwater, mine water, drilling fluid and deep groundwater using optical emission spectrometry (OES) with inductively coupled plasma (ICP). In liquid samples, cations can be determined over a wide range of concentrations (traces to percentages).
The spectrophotometer can be used to determine concentrations of anorganic compounds (e.g. ammonium, nitrate, nitrite and ortho-phosphate) in groundwater samples.
Imaging Technologies
Rock physics characterization
The rock physics characterization package includes devices for measurements of:
  • Density
  • Porosity
  • Thermal conductivity

Zusätzliche Information


Prof. Dr. Rolf Bracke

Professor für Geothermie und Umwelttechnik
Direktor GZB - International Geothermal Centre

Raum: G1 1-011
Tel.: +49 (0)234 32-10216

Rolf Bracke

Dipl.-Ing. Volker Wittig

Leiter der Abteilung Advanced Drilling Technologies

Raum: G1 1-003
Tel.: +49 (0)234 32-10768

Volker Wittig

Prof. Dr. Erik Saenger

Leiter der Abteilung Reservoir Engineering and Rock Physics

Raum: G1 1-005

Tel.: +49 (0)234 32-10718

Erik Saenger