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- Title
Influence of the Blowout Preventer Shut-Off Process on Wellbore Pressure.
- Authors
Jia, Jia; Su, Yi Nao; Shen, Yue; Hu, Gai Xing; Zhang, Ling Tan; Wang, Long; Sheng, Li Min
- Abstract
The prevailing research analyzing the transient pressure in the blowout preventer shut-off process using water hammer theory is not in accordance with the real-world situation due to the long blowout preventer shut-off periods. In this paper, to solve the well-control problem in the case of gas invasion, using downhole telemetry information, we propose a new mathematical model for analyzing the generating mechanism of transient pressure in the blowout preventer shut-off process and its effect on wellbore pressure. The mathematical model of transient pressure generated in the blowout preventer shut-off process is established using a fluid inertial pressure analysis of unsteady flow. The model clearly shows the influence of ram moving velocity, fluid velocity, fluid density, and blowout preventer structural parameters on the transient pressure. The propagation characteristics of the transient pressure along the wellbore are analyzed using Lamb's law. The results show that the transient pressure amplitude generated in the blowout preventer shut-off process is small and rapidly decays when it propagates along the wellbore, so its influence on the wellbore pressure is negligible. The wellhead backpressure plays a major role in affecting the wellbore pressure. This study theoretically solves the dispute between choosing "hard shut-in" or "soft shut-in" of the blowout preventer, thus providing an alternative to relying on engineering experience, offering guidances for the accurate analysis of the influence of the blowout preventer shut-off process on wellbore pressure, and giving new operation advice for blowout preventer operation when gas invasion occurs.
- Subjects
WATER hammer; PROBLEM solving; FLUID pressure; WATER use; MATHEMATICAL models
- Publication
Chemistry & Technology of Fuels & Oils, 2021, Vol 57, Issue 3, p571
- ISSN
0009-3092
- Publication type
Article
- DOI
10.1007/s10553-021-01279-y