Research Article
Study on Method of Determining the Safe Operation Window of Drilling Fluid Density with Credibility in Deep Igneous Rock Strata
Table 1
Pressure constraint criteria of drilling engineering risks.
| | Risk type | Safe density window boundary conditions (g/cm3) |
| | Lower limit of kick | | | Lower limit of wellbore collapse | | | Upper limit of wellbore collapse | | | Upper limit of differential pressure sticking | | | Upper limit of lost circulation | | | Upper limit of lost circulation during well killing | |
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