|
Slide 19
There is another important way that the cementing of the metal casing can be compromised.
After the cement is forced into the annular space, the driller is supposed to wait 8 hours before continuing to drill on down the hole. This is to allow the cement to harden sufficiently to do its job. But it costs the driller bunch of money for the drilling rig to sit there idle for 8 hours. We regularly get complaints that drillers do not wait the 8 hours before they start drilling. If the driller does not wait, the new drilling activity can cause cracks and spaces up and down the cementing of the casing.
|
