Well-logging

Measurement of the physical parameters of the rock environment, well casing and liquids in the well using natural and man-made physical fields. Well-logging has a wide variety of uses in various types of projects. Although each task requires an individual approach, well-logging projects can be divided into the following categories:

Well-logging for engineering geology: lithological profiles, level of tectonic disturbance of rock, mechanical characteristics of rock, integrity of impervious walls, water leaks from dams and reservoirs, control of geotechnical work at reservoirs, control of in-situ injection, spatial course of wells, detection of erosion areas in landslide areas, inves

Measurement of the physical parameters of the rock environment, well casing and liquids in the well using natural and man-made physical fields. Well-logging has a wide variety of uses in various types of projects. Although each task requires an individual approach, well-logging projects can be divided into the following categories:

Well-logging for engineering geology: lithological profiles, level of tectonic disturbance of rock, mechanical characteristics of rock, integrity of impervious walls, water leaks from dams and reservoirs, control of geotechnical work at reservoirs, control of in-situ injection, spatial course of wells, detection of erosion areas in landslide areas, investigation of future current coal, lime, kaolin, betonies, sand etc. mine areas.

Control of the technical condition of wells and boreholes: verification of flow, visual control of well walls using video cameras, water flow in the well and function of the casing, quality of cementation and gravel packing, condition of perforation, cavities in the casing, recommendation of further use and proposal of necessary remedial work.

Well-logging for risk analysis, supervision and for various stages of remediation: lithological profile, horizontal and vertical flow in the well, flow between permeable layers, hydraulic permeability (hydraulic conductivity) of permeable layers, determination of preferential flow paths, estimation of level of risk and recommendation for further steps.

Investigation of mineral and thermal water, investigation of drinking water resources: lithological profile, horizontal and vertical flow in the well, flow between permeable layers, proposal of apparatus for the determination of permeable layers, determination of hydraulic short circuiting caused by poor casing, hydraulic permeability (hydraulic conductivity) of permeable layers.

Well-logging of deep wells for geothermal energy: precise thermometry, lithological profiles, flow of water in the wells, level of rock fracturing

The well-logging division of AQUATEST a.s. carries out measurements using the following well-logging methods:

gamma well-logging – natural radioactivity

neutron well-logging – hydrogen content (water, clay etc.)

gamma gamma well-logging – dimensional mass

magnetic well-logging - magnetic susceptibility

electro resistivity well-logging - apparent electrical resistivity of rock

slipping contacts – rock conductivity

automatic polarization - potential

acoustic well-logging – tensile strength and geo-mechanical properties

acoustic well-logging with record of complete wave image– geomechanical characteristics,

cavernometry – diameter of the well

inclinometry - gradient and azimuth of gradient

thermometry - temperature

photometry – optical lucidity of liquid

flowmetry – vertical flow of liquid

resistivimetry – measurement of the electrical resistivity of liquid

method of dilution – natural movement of liquid

method of constant pumping and constant injection – areas of flow and hydraulic conductivity

video inspection of wells and boreholes - digital color video

detection of the direction of horizontal flow in the well

Selection of the set of well-logging methods for a specific project depends on the particular issue at hand. Output values from well-logging measurements are obtained both by an appropriate combination of well-logging methods and quality processing of terrain data. This is facilitated by an experienced project team able to correctly synthesize measured and known data and apply the appropriate technology and software. The graphic database system GD Base developed in the Czech Republic is used for the processing of terrain data. The maximum depth with of measurement is 2000 m with video inspection of wells and boreholes limited to a depth of 850 m.

tigation of future current coal, lime, kaolin, betonies, sand etc. mine areas.

Control of the technical condition of wells and boreholes: verification of flow, visual control of well walls using video cameras, water flow in the well and function of the casing, quality of cementation and gravel packing, condition of perforation, cavities in the casing, recommendation of further use and proposal of necessary remedial work.

Well-logging for risk analysis, supervision and for various stages of remediation: lithological profile, horizontal and vertical flow in the well, flow between permeable layers, hydraulic permeability (hydraulic conductivity) of permeable layers, determination of preferential flow paths, estimation of level of risk and recommendation for further steps.

Investigation of mineral and thermal water, investigation of drinking water resources: lithological profile, horizontal and vertical flow in the well, flow between permeable layers, proposal of apparatus for the determination of permeable layers, determination of hydraulic short circuiting caused by poor casing, hydraulic permeability (hydraulic conductivity) of permeable layers.

Well-logging of deep wells for geothermal energy: precise thermometry, lithological profiles, flow of water in the wells, level of rock fracturing

The well-logging division of AQUATEST a.s. carries out measurements using the following well-logging methods:

gamma well-logging – natural radioactivity

neutron well-logging – hydrogen content (water, clay etc.)

gamma gamma well-logging – dimensional mass

magnetic well-logging - magnetic susceptibility

electro resistivity well-logging - apparent electrical resistivity of rock

slipping contacts – rock conductivity

automatic polarization - potential

acoustic well-logging – tensile strength and geo-mechanical properties

acoustic well-logging with record of complete wave image– geomechanical characteristics,

cavernometry – diameter of the well

inclinometry - gradient and azimuth of gradient

thermometry - temperature

photometry – optical lucidity of liquid

flowmetry – vertical flow of liquid

resistivimetry – measurement of the electrical resistivity of liquid

method of dilution – natural movement of liquid

method of constant pumping and constant injection – areas of flow and hydraulic conductivity

video inspection of wells and boreholes - digital color video

detection of the direction of horizontal flow in the well

Selection of the set of well-logging methods for a specific project depends on the particular issue at hand. Output values from well-logging measurements are obtained both by an appropriate combination of well-logging methods and quality processing of terrain data. This is facilitated by an experienced project team able to correctly synthesize measured and known data and apply the appropriate technology and software. The graphic database system GD Base developed in the Czech Republic is used for the processing of terrain data. The maximum depth with of measurement is 2000 m with video inspection of wells and boreholes limited to a depth of 850 m.