If normal well killing techniques are not possible or will result in critical well control conditions bullheading may be considered whereby mud/influx in displaced/squeezed back into the weakest open hole formation. Bullheading is a critical option of well killing and authorisation to proceed with this method of well killing must generaly be obtained form the Drilling Superintendent.
It shall only be used under the following circumstances:
- Large influx which may result in excessive volume of gas or excessive pressure at surface if circulated out.
- Influx is likely to contain . . .
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