More recently it has evolved to providing direct viewing of formation images as the bit moves through the rock. Borehole images provide the optimum means to reach the desired target with fewer correction runs, less tortuosity and more borehole placement within the target reservoir. However, these two measurements differ in that real-time imaging requires a vast amount of data to be transmitted uphole through a very narrow bandwidth. The challenge has been to increase the amount of transmitted information on one side, while improving the telemetry process on the other. Both measurements work toward the goal of optimally guiding wells via unambiguous reservoir information, as opposed to data requiring interpretation.
Simplicity is key.
Success depends on deploying the correct technology, from downhole sensors capable of quantitative high-resolution measurements, to advanced microprocessors and telecommunications techniques capable of synthesizing and compressing data. LWD provides the real-time data to define the geologic environment and drilling process, serving to continuously confirm or update the MEM prediction. Remedial or preventative measures might be required if inconsistencies between prediction and reality exist. Real-time images of the formation on the scale of the wellbore, or seismic images on the scale of the reservoir, will both have pronounced effects on reducing nonproductive time when drilling, steering, and positioning wells while mitigating associated risk. They will transform the decision-making process, creating a new paradigm in which decisions become a truly collaborative effort.