Borehole Camera Observation Report
INTRODUCTION
DAY 1: Lecture on the introduction to the field course was done which also included the safety principles and conduct on site. In depth details and explanation of the exercise was achieved.
DAY 2: It was spent on GZG, Geothermal Test Site North Campus, located in Göttingen, with location coordinates; 51.556746, 9.943812. It comprises of 5 test wells, Wells M, E, W, N, S.
Tests carried out on site: Water level measurement, borehole camera observation using gamma rays, pumping test, and Fibre optical cable experiment (tracer test).
DAY 3: Task was spent on Stegemuhle Test Site, City of Gottingen. The weather was hot and sunny.
Fig 2: Showing the locations of the wells in the test field “Stegemüle” Gottingen (R. Brauchler,et …show more content…
It basically checks and monitors the well subsurface and features.
Equipment used: We made use of the JVC-manufactured equipment comprised of a rotating camera, a monitor with optic fiber cables which showed the picture of the well screen and the features therein.
Procedure: The camera was positioned into the well with the help of a winch apparatus which was used in lowering and raising the camera. We set the depth counter to zero when we touched the water, and also noted the reference point which was zero, when we touched the water it was 4.24m below the rim cap. Next, we found the right focus and good view of the camera and the full pipe section was visible.
RESULTS:
We observed clay particle intrusion flowing down the well from the joints. The second joint was at 4m below, and at 4.19m, the screen section of the well started. Inspecting the region, we noticed clay and stone-like materials coming out of the screen which indicated that the gravel pack was not correctly placed. Further massive clogging was noticed from joints and slotted sections as we went down the well to the bottom which was as a result of non-cleaning, usage or pumping of the …show more content…
Heat is widely recognized as an excellent tracer for a range of hydro geological processes that can be inferred from temperature-depth measurements in boreholes. (Saar, 2011).
A cross borehole thermal tracer test is then analyzed to identify fracture zones that are in hydraulic connection between boreholes and to estimate spatially distributed temperature breakthrough in each fracture zone. (T. Read, et al, 2013).
Cone penetration test (CPT)
Aim: This experiment was aimed at determining the stratigraphy, bedding layers, depths and geotechnical properties of the soil.
Equipments used: A crawler movable direct push machine “Geoprobe 7730DT” was used, data logger system, drills bit, drilling pipes.
Principles and Procedures: The geoprobe machine used works on direct push technology. Wenner probe was hammered down the ground and we observed a high impact force due to the hammering. More drilling rods were added to the hammer head as drilling into the ground continued until the desired depth was achieved. A data logging device records the electrical conductivity of the subsurface as well as the drilling speed and rate of penetration into the ground with respect to depth. Analyzing and plotting the results show different stratigraphy of the underground.
DAY 1: Lecture on the introduction to the field course was done which also included the safety principles and conduct on site. In depth details and explanation of the exercise was achieved.
DAY 2: It was spent on GZG, Geothermal Test Site North Campus, located in Göttingen, with location coordinates; 51.556746, 9.943812. It comprises of 5 test wells, Wells M, E, W, N, S.
Tests carried out on site: Water level measurement, borehole camera observation using gamma rays, pumping test, and Fibre optical cable experiment (tracer test).
DAY 3: Task was spent on Stegemuhle Test Site, City of Gottingen. The weather was hot and sunny.
Fig 2: Showing the locations of the wells in the test field “Stegemüle” Gottingen (R. Brauchler,et …show more content…
It basically checks and monitors the well subsurface and features.
Equipment used: We made use of the JVC-manufactured equipment comprised of a rotating camera, a monitor with optic fiber cables which showed the picture of the well screen and the features therein.
Procedure: The camera was positioned into the well with the help of a winch apparatus which was used in lowering and raising the camera. We set the depth counter to zero when we touched the water, and also noted the reference point which was zero, when we touched the water it was 4.24m below the rim cap. Next, we found the right focus and good view of the camera and the full pipe section was visible.
RESULTS:
We observed clay particle intrusion flowing down the well from the joints. The second joint was at 4m below, and at 4.19m, the screen section of the well started. Inspecting the region, we noticed clay and stone-like materials coming out of the screen which indicated that the gravel pack was not correctly placed. Further massive clogging was noticed from joints and slotted sections as we went down the well to the bottom which was as a result of non-cleaning, usage or pumping of the …show more content…
Heat is widely recognized as an excellent tracer for a range of hydro geological processes that can be inferred from temperature-depth measurements in boreholes. (Saar, 2011).
A cross borehole thermal tracer test is then analyzed to identify fracture zones that are in hydraulic connection between boreholes and to estimate spatially distributed temperature breakthrough in each fracture zone. (T. Read, et al, 2013).
Cone penetration test (CPT)
Aim: This experiment was aimed at determining the stratigraphy, bedding layers, depths and geotechnical properties of the soil.
Equipments used: A crawler movable direct push machine “Geoprobe 7730DT” was used, data logger system, drills bit, drilling pipes.
Principles and Procedures: The geoprobe machine used works on direct push technology. Wenner probe was hammered down the ground and we observed a high impact force due to the hammering. More drilling rods were added to the hammer head as drilling into the ground continued until the desired depth was achieved. A data logging device records the electrical conductivity of the subsurface as well as the drilling speed and rate of penetration into the ground with respect to depth. Analyzing and plotting the results show different stratigraphy of the underground.