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Why do you sometimes have to circulate mud halfway down the drill?
Release time:
2019-09-21
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Source:
1) The downhole has not been tripping in for a long time, or the mud has not been circulated well due to other reasons before the last trip, so as to prevent the mud performance from deteriorating and the pump cannot be started.
2) Collapse of downhole formation.
3) Slurry performance is deteriorated due to salt water, gypsum and other pollution.
4) There is slight leakage downhole.
5) The downhole situation is complicated, and the pump is often not started.
6) For complex deep wells or ultra-deep wells, or high-pressure oil and gas layers have been drilled, the mud shall be treated in sections.
If the mud is not circulated halfway, it will cause resistance to tripping, the pump will not be started after tripping, or the pump pressure is too high to leak the formation.
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