Our services
We strive to tailor our services to meet our customers specific needs and requirements.
At Geo-log,
our mission is to provide top-notch services to our customers, ensuring their satisfaction every step of the way.
Over the past 30 years, we have made significant advancements in our winches, equipment, and vehicle fleet to ensure that we can perform outstanding measurements in a variety of challenging environments.
Whether we’re working in geothermal water wells thousands of meters deep or navigating the narrowest mine shafts that require small mobile equipment, we have the tools and technology to deliver the highest quality results.
Wireline Open Hole logging
No matter the drilling purpose, wireline open hole logging is the best solution to evaluate downhole properties and fluid content of the formation penetrated by the borehole.
As Geo-Log’s oldest scope of activity, our wireline open hole logging services include all types of surveys needed in geothermal, groundwater, karstwater, geotechnical and geological exploration; and mining.
- Shallow and deep potential resistivity log (R10/R40 or R40/R160)
- Spontaneous potential log (SP)
- Guard Laterolog (LL3)
- Induction resistivity log
- Micro resistivity log
- Mud resistivity log
- Induced polarization log (IP)
- Magnetic susceptibility log
- Natural gamma-ray log (GR)
- Spectral gamma-ray log (SGR)
- Gamma-gamma density log (Cs-137)
- Neutron porosity log (AmBe-241)
- NMR log (with rented tool)
- Fullwave sonic log (Vp, Vs)
- Cement bond log (CBL)
- Acoustic borehole telewiever log (ABI))
- Vertical seismic profile (VSP)
- Temperature log (TL)
- 1 or 3 arm caliper log
- Inclination+azimuth log
- 4 arm dipmeter log (DIP)
- Optical borehole telewiever log
- Borehole camera inspection
Cased hole diagnostic for new and old wells (well test)
The aim of well inspections could be:
- quality check of a new well (for for authorization)
- well integrity and dynamic test of old wells, subsequent authorization
- failures, problems detection in case of malfunction
Inspection of well structure, its condition, or its fluid mechanics helps in establishing optimal production levels, identifying construction deficiencies and may provide explanation to changes in well condition.Our wireline cased hole logging list of surveys can be expanded by well-testing, fluid sampling or camera inspection on the Client’s request.
Our well testing system, inclusive of several portable and truck-mounted elements, makes mobilisation easy and facilitates a time-effective operation. Thus we are capable of performing surveys simultaneously in multiple wells for the purpose of interference tests.
- Pressure gradient
- Downhole flow rate test
- Real-time downhole pressure registration
- Wellhead pressure registration
- Downhole sampling (water, gas)
- Bottom depth check
- 3 -arm Caliper
- Well screen localization
- Cement Bond Logging (CBL)
- Temperature
- Flowmeter+temperature
- Fluid resistivity
- Optical transparency
- Static water level
- Dynamic water level and flow rate test
- Recovery test
- Water sampling
- Gas separating
- Water and gas volume
- Water / gas flow rate
- Labor tests (with subcontractor lab)
During a complex work process Geo-Log delivers important data that quantify well and reservoir characteristics. This information helps our Clients to optimise production or injection and assists in planning or modifying technologies based on
wells.
Our well testing system, inclusive of several portable and truck-mounted elements, makes mobilisation easy and facilitates a time-effective operation. Thus we are capable of performing surveys simultaneously in multiple wells for the purpose of interference tests.
For the downhole parameters, application of slickline or wireline cased hole logging is neccessary. In order to measure the gas/water ratio, gas phase has to be separated from liquid phase. For this purpose Geo-Log Ltd uses easy-to-transport test separators in different sizes that can handle almost any flow rate.
Well and Borehole Camera Inspections
Our company provides the most innovative downhole camera inspection systems for a wide variety of situations.
The system’s biggest advantage is that the downhole probe lens provides real-time view which can be rotated in 3D at 180° through software control by the operating personnel from the surface. In brief we have full visual coverage in vertical, horizontal, cased or open holes.
Our technology provides a most accurate inspection of well casings, well screen damages, dropped object detection, quality of rock formation, etc.
Borehole Seismic
The Downhole measurement
Downhole seismic provides shear wave velocities (VS) and compressional wave velocities (VP) for geological layers along a borehole. Soil dynamic parameters, such as shear modulus, Poisson ratio and Young’s modulus can be determined with density measurements that can be done with our radioactive source. We can perform these measurements up to a depth of 150 m.
Vertical Seismic Profile (VSP) measurement
VSP provides useful data to improve the geological model interpreted based on the surface seismic section. We can provide the following VSP measurements to our partners (Checkshot VSP, Zero offset VSP, Offset VSP) down to 3000 m depth, utilizing vibroseis (IVI MARK 4 Y2400 hydraulic vibrators) sources and GV Seismic Geophone sonde.
Slickline
For downhole pressure and temperature surveys,
Geo-Log Ltd. provides slickline services with electronic memory probes (max. 150°C, max. 300 bar), mobile winch systems and self-mounted lubricators. This solution makes the mobilization and installation much easier and faster, thus keeping the operation more time-effective and low-budget.
Downhole and Surface Fluid Sampling
Besides volume and temperature, ground water utilization also depends on physical and chemical properties, total dissolved solid (TDS) and gas content.
Regardless of the number of surveys performed in a well, you will never get a comprehensive concept of the well without liquid/gas sample analysis.
Geo-Log Ltd. uses easy-to-use and easy-to-transport separators that can be quickly assembled on-site for the purpose of gas/liquid separation and sampling. These tools are sized to adapt to any flow rate.
If surface sampling is not possible due to special circumstances during well production or we only need samples from a specific depth, we recommend the use of a downhole sampler tool. This tool allows us to get gas/water samples from any depth (max. to 1300 m) and we can determine the gas-water ratio.
Special borehole measurements
Since its foundation our company has been approached many times to perform surveys that had not originally been included in our services or where well temperatures had been higher than the operational temperature of our tools. However that has never stopped us from welcoming these opportunities as we were trying to fulfill our Clients’ wishes.
All industry tools are now easy-to-integrate, can be transported quickly and supported remotely. Any tool rented or purchased from a foreign country or provided by our Client can be integrated into our survey systems.
NMR (nuclear magnetic resonance) survey in a geological exploration project with both the NMR probe and its surface processing unit being rented (by Geo-Log) from a third party while providing our own field crew, winch and survey vehicle.
High-temperature BHTV (acoustic borehole television) survey in a geothermal exploration project with logistics as NMR.
High-temperature spectral gamma survey in a mining exploration project with the SGR probe rented while the surface processing unit, the field crew, the winch and the survey vehicle were all provided by Geo-Log.
Geothermal well inspection with extremely high well-head pressure: Geo-Log providing a slickline winch and memory gauges while the lubricator was rented