Formation Instability

Formation Instability When dealing with areas of formation instability it is necessary to:

- trip cautiously through swelling formations

- pick up and ream midway through each stand (if hole conditions are severe, more frequent reaming may be required)

- trip through tight sections using slow rotation and circulation (after pulling into a tight spot, run back into gauge hole and circulate before back reaming out)

- ensure that sections of the hole found to be tight on the way out are always reamed on the trip back in.

- increase MW to maximum allowable for . . .

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