What question did this study set out to answer?

Formulate a transient wellbore-formation pressure model and develop a surface-pressure-based screening method to detect simultaneous upper-loss and lower-kick events.

August 14, 2026ProcessesOpen Access

Shut-In Pressure Evolution and Surface-Pressure-Based Screening of Upper-Loss–Lower-Kick Scenarios

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Authors

GXGuizhen XinChina University of Petroleum, East China LLLuxiang LiuChina University of Petroleum, East China YGYonghai GaoChina University of Petroleum, East China

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Implication

Transient modeling reveals distinct surface pressure buildup dynamics during simultaneous loss-kick events in ultra-deep wells, highlighting a method for rapid downhole hazard screening.

Key Points

Formulate a transient wellbore-formation pressure model and develop a surface-pressure-based screening method to detect simultaneous upper-loss and lower-kick events.
Constructed a transient wellbore-formation pressure model integrating phase mass conservation, global volume balance, and a gas–liquid partition coefficient to simulate phase separation at fracture inlets.
Established a screening diagnostic based on shut-in casing pressure (SICP) and shut-in drillpipe pressure (SIDPP) curves and evaluated its diagnostic accuracy on five field cases (N=5).
Circulation loss constrained bottomhole pressure recovery post-shut-in, causing sustained gas influx, a lower initial SICP, and a steeper subsequent pressure buildup relative to kick-only scenarios.
Preferential liquid loss represented by a smaller partition coefficient retained excess free gas in the wellbore, further accelerating the rate of SICP buildup.
The screening method correctly diagnosed all 5 field cases, accurately distinguishing 3 upper-loss–lower-kick events from 2 kick-only events in complete concordance with field observations.

Cite This Study

Xin et al. (2026) studied this question.

synapsesocial.com/papers/6a7ec7aab70b84ec8b91435e https://doi.org/10.3390/pr14162575

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Implication

Transient modeling reveals distinct surface pressure buildup dynamics during simultaneous loss-kick events in ultra-deep wells, highlighting a method for rapid downhole hazard screening.

Shut-In Pressure Evolution and Surface-Pressure-Based Screening of Upper-Loss–Lower-Kick Scenarios

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Cite This Study

Shut-In Pressure Evolution and Surface-Pressure-Based Screening of Upper-Loss–Lower-Kick Scenarios

Discussion

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Implication

Key Points

Cite This Study

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