Selecting the type of drill bit for well deviation formation
2022-04-22 16:45:58
The larger formation dip is the main reason for the well deviation, and the bending of the lower drill string and the improper selection of the drill bit type are the technical factors that cause the well deviation.
From the long-term production practice, the shaft-shift type bit is likely to cause well deviation when drilling in inclined formations, so the roller cone bit with no shaft-shift or a small amount of shaft-shift should be selected. At the same time, under the premise of ensuring a small axis shift, a bit softer than the formation rock should also be selected, so that the ROP can be increased at a lower WOB, which can not only ensure the ROP, but also reduce the well deviation.
