In an ideal borehole and mud system, cuttings would be transported to surface with the same order and composition as they were cut, as in Figure 1. In reality, it is commonly observed that, no matter how sharp a drilling break or clearly defined a formation top on an electric log, the formation top as logged from cuttings will appear to be “transitional.” (Note: not transitional in the sense that the cuttings show a varying composition, but that cuttings of a new type appear in increasing abundance as more hole is made.)Continue reading “Drilling Cuttings RECOVERY”
A mud log is a chemical and visual analysis of the drilling mud and well cuttings for traces of subsurface natural gas and crude oil as the well is being drilled.Continue reading “What Is Mud LOGGING”
The circulating system pumps drilling mud in and back out of the well hole. Drilling mud is stored in several steel mud tanks on the ground beside the rig.
A step-change is needed in drilling process control, to enable consistently high performance, accurate pressure control and reduced risk of unwanted effects. Advances in process control have been made but risk reduction and optimization of the drilling process is still a major challenge.Continue reading “Drilling Mud Process Control”