We have been logging the past few days because of some drilling issues that needed to be taken care of. A couple nights ago, some sticks found their way into the mud tank and blocked the flow of drilling mud into the hole. Below is an image of what happens to a drill bit when there is no mud lubricating the cutting face (these are PQ drill bits with an inner diameter of 3.378 inches):
The bit on the left is "used" and needs to be replaced. The bit on the right is "abused" and has had its cutting teeth ripped off by turning on bare rock without drilling mud to lubricate the cutting face. Here's another view to illustrate the point:
Note that the bit on the right is also bowed beneath the teeth, a response to the weight of the drill string on top of the bit as it tried to cut without the help of drilling mud.
The drill crew was able to recover from this issue, and after spending yesterday doing maintenance on the rig, we are back to standard coring operations.
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