DRILLING WORK

Drilling is part of geological survey work, the use of drilling machines with different types of drill bits and rods to drill into the ground to a certain depth (possibly hundreds of meters). During the drilling process, drill cores will be collected for the purpose of describing the geological stratum conditioning of the ground. Some types of samples such as undisturbed samples, disturbance samples, water samples, and rock samples will be taken and analyzed in the laboratory to determine the mechanical properties of the soil as well as the chemical composition of the water, water corrosion performance of standard concrete.

Machine rotary drilling

Rotary drilling is used with large capacity drilling machines, combined with specialized drill bits to collect samples with good quality. Drilling can be performed in different conditions such as drilling on land, plains, swamps, mountainous areas and also on the water. Depending on geological conditions, construction purposes, the drilling process and the depth of the borehole will also change.

During the drilling process or when the drilling has been completed, depending on the foundation conditions and design requirements, some types of tests will be conducted in the borehole such as standard penetration test (SPT), pour test water in the borehole, water pressure test in borehole, water absorption test in borehole, ground wave velocity measurement test (downhole test, crosshole test).

Some types of rock, soil and water samples will also be collected and analyzed in the laboratory to determine the mechanical properties of soil, rock and water chemistry.

GOSCO has equipped drilling rigs XY-1A, XY-3 for survey drilling. These rigs have large capacity, high flexibility, and easy transport, which will help ensure the quality of drilling also meet the urgent requirements of the project.

OFFSHORE DRILLING WORK

The geological drilling for marine designing works is a challenge for engineers and survey workers, especially when it must be implemented in unfavourable weather conditions such as big waves and high speed of wind, or thunderstorms. When drilling on the sea, it will be very difficult if using buoys or boats or barges as floating unit for drilling due to instability and it is strongly impacted by wind, waves, ocean currents and tides.
GOSCO equips “jackup” drilling rigs for offshore drilling. The jackup flatform is highly flexible, less affected by weather conditions such as wind, waves, currents or tides. This stability will help drilling quality assurance and also meet the urgent requirements of the progress of the project.

MANUAL DRILLING

Manual drilling is the use of hand drills with different types of drill bits and rods (usually a spiral auger drill rod) to drill into the ground to a certain depth, usually no more than 12m. During the drilling process, drill core will be collected for the purpose of describing the electrostatic conditioning of the ground. Some types of samples such as undisturbed samples, disturbance samples, and water samples will be taken and analyzed in the laboratory to determine the mechanical properties of the soil as well as the chemical composition of the water, the ability to corrosion of water for standard concrete.

GOSCO

We desire and always try our best to provide reliable topographic, geological and hydro-meteorological data that can contribute the suitable, safe and effective design solutions for structures.

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Topographical survey

Geological survey

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Hydrographic survey (under water survey)