Achieving the highest rate of penetration with the least possible bit wear and minimal hole problems is the goal of every drilling engineer. Bit selection is one of the most important parameters for planning and designing a new oil or gas well since the factors affecting the bit performance have complex relationships between formation properties, bit hardware design and operational parameters.
Tercel’s GeoSCAN program is proprietary software designed to analyze rock based on electrical logs to predict rock characteristics.
The rock hardness is usually calculated as the Unconfined Compressive Strength (UCS) by directly correlating the rock’s geophysical properties with electric log data and elastic properties of rocks. The Unconfined Compressive Strength (UCS) calculates the amount of energy required to reach rock sample failure without applying any lateral confinement.
In downhole drilling there is always a confinement due to the pressure of surrounding rock. This confinement increases as holes are drilled deeper and induces a rise in the amount of energy needed to crush the rock. This energy is called “Confined Compressive Strength” (CCS).
A new methodology has been developed for the calculation of an apparent confined compressive strength (CCS) of the rock.
This methodology removes uncertainty and subjectivity regarding the apparent strength of the rock to the bit, especially in deep and/or significantly over-balanced drilling conditions.
Gaining geomechanical knowledge of the well field’s area gives the driller a greater understanding of what should occur downhole and how to apply the best parameters during the drilling operation.
Running GeoScan analysis in offset wells with a good knowledge of the field geology is the best way to realize a realistic forecast of the future well’s formations and their geomechanical properties.
As well as an aid to selecting the right drill bit for the job, GeoScan can also be used as a post-analysis tool to help understand the conditions downhole once the run has taken place.
http://www.terceloilfield.com/products/software/geoscan/
Tercel’s GeoSCAN program is proprietary software designed to analyze rock based on electrical logs to predict rock characteristics.
The rock hardness is usually calculated as the Unconfined Compressive Strength (UCS) by directly correlating the rock’s geophysical properties with electric log data and elastic properties of rocks. The Unconfined Compressive Strength (UCS) calculates the amount of energy required to reach rock sample failure without applying any lateral confinement.
In downhole drilling there is always a confinement due to the pressure of surrounding rock. This confinement increases as holes are drilled deeper and induces a rise in the amount of energy needed to crush the rock. This energy is called “Confined Compressive Strength” (CCS).
A new methodology has been developed for the calculation of an apparent confined compressive strength (CCS) of the rock.
This methodology removes uncertainty and subjectivity regarding the apparent strength of the rock to the bit, especially in deep and/or significantly over-balanced drilling conditions.
Gaining geomechanical knowledge of the well field’s area gives the driller a greater understanding of what should occur downhole and how to apply the best parameters during the drilling operation.
Running GeoScan analysis in offset wells with a good knowledge of the field geology is the best way to realize a realistic forecast of the future well’s formations and their geomechanical properties.
As well as an aid to selecting the right drill bit for the job, GeoScan can also be used as a post-analysis tool to help understand the conditions downhole once the run has taken place.
http://www.terceloilfield.com/products/software/geoscan/
