For Coring Supervision of the whole coring operation our Core Specialists will provide technical input on all levels; coordinate the coring operation and ensure a safe and cost efficient operation. Responsible for collating and reporting all relevant coring data throughout the cored phase and concluding with follow up meetings and lessons learned for future wells. Roles include preparing pre-tour meetings for crews on location with presentation of the core operation and objectives, prepare risk assessments, present toolbox talks for all steps of the operation, liaise with coring engineers, drilling crew and core handling crew to optimize core recovery and efficiency, to report an after action review, to optimize future core operations.

For mud tracing the leading GeoTechnician consults with the mud engineer to condition the mud, calculating and controlling the amount of Tracer (Deuterium oxide, Tritium oxide, etc.) being added to the water phase of the coring mud, thus any water phase penetrating into the core can later be detected and calibrated to generate a more accurate water saturation profile.

Our Geologist support the wellsite geologist and will give operational geological guidance/input to the coring program, defines core point. In the core processing phase, he/she will be responsible for detecting the top of core, calculating the recovery and supervise the marking of core with depths, sample numbers and cut marks where required. He evaluates core gamma data. He does the petro graphic description, sedimentology including the chip sampling and facies description, but he will take also high resolution digital pictures from core end faces for geological description and documentation.

The processing of core is a multitask operation and the core technician cleans the laid down core barrels, measure and mark them by using permanent marker with depth to the end of the core (in the catcher), section or sample numbers and cut line if required. Then the technician measures and records with the core gamma surface logger the natural gamma radiation in core sections. The core gamma log is most commonly used for correlation purposes and to distinguish different lithological units. Once the Geologist has confirmed the core gamma data the core gets sawn into manageable lengths with our state of the art air

After the core gets sawn into manageable lengths the Geologist will take high definition photos from core end faces as a permanent record of the core sections for detailed geological studies or presentation. Digitised images of the core can be stored and uploaded direct from our client server.

The Core Technician will first locate and mark the maximum bedding, where visible, for each core piece. This enables the core to be slabbed correctly for later laboratory analysis as required. This is done before he is taking the plug samples parallel to the bedding whenever possible. To take these plug samples from the core, our experienced core technician will have a solid geological knowledge and is properly trained to the highest standards in our core laboratory before being allowed to obtain wellsite samples from the core. With this fresh wellsite plug sampling whole core preservation is optimized. Our goal is to ensure that all samples reach the laboratory in a good and preserved condition.

To ensure core is stabilised for transport to our costumer’s laboratories without structural damages to the core, a variety of techniques are available. Once the fresh state samples have been recovered, the process starts in ensuring the remaining core is prepared for transportation, the annulus is filled with a medium that will prevent the core from moving within its outer tube. GeoCore technicians can use different methods for core stabilization including foam injection, epoxy injection and less often gypsum. This gives your core maximum protection against freight damages.

There may be times when a wellsite geologist or their operations team, back in the office, need to get a clearer visual of the core in situations to make real-time decisions that could save valuable time and money. GeoCore have the means in the field to slab the core immediately upon its recovery. By using our mobile saw we can cleave apart the inner tube longitudinally. This lets the tube lift, clam shell style, to expose the outer wall of the core. This then allows for any basic lithological descriptions to be carried out.

To ensure the core leaves the rig without any structural damage to it, each individual core piece is boxed up in readiness for dispatch to the core laboratory or facility, where further analysis will be carried out. It is therefore vital that the core condition remains stable from the wellsite and every possible measure is taken to fulfill this requirement. Our Core dispatcher checks each core piece to ensure all annotations are visible and legible prior to it being wrapped in foam and placed in sturdy transport crates or boxes. All paperwork is then checked, manifested and reported to the company personnel. This responsibility for the well being of the core does not end until the consignment reaches the laboratory.