A Real-Time Identification Method for the Bottomhole Gas Invasion State in Managed Pressure Drilling

HE Miao; LIU Gong-hui; LI Jun; ZHANG Tao; LI Meng-bo; GUO Qing-feng

doi:10.3879/j.issn.1000-0887.2015.08.008

Volume 36 Issue 8

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Article Navigation > Applied Mathematics and Mechanics > 2015 > 36(8): 865-874

HE Miao, LIU Gong-hui, LI Jun, ZHANG Tao, LI Meng-bo, GUO Qing-feng. A Real-Time Identification Method for the Bottomhole Gas Invasion State in Managed Pressure Drilling[J]. Applied Mathematics and Mechanics, 2015, 36(8): 865-874. doi: 10.3879/j.issn.1000-0887.2015.08.008

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A Real-Time Identification Method for the Bottomhole Gas Invasion State in Managed Pressure Drilling

doi: 10.3879/j.issn.1000-0887.2015.08.008

¹School of Petroleum Engineering, China University of Petroleum,Beijing 102249, P.R.China;²Beijing Information Science & Technology University, Beijing 100192, P.R.China;³CNOOC Research Institute, Beijing 100027, P.R.China;⁴Research Institute of Petroleum Exploration & Development, Beijing 100083, P.R.China

Funds: The National Natural Science Foundation of China（Key Program）（51334003）;The National Natural Science Foundation of China（General Program）（51274221;51274045;51374223）

Received Date: 2015-02-02
Rev Recd Date: 2015-06-24
Publish Date: 2015-08-15

Abstract

Abstract

Real-time identification of the bottomhole gas invasion state is the key to well control during managed pressure drilling (MPD), which is directly related to the selection of follow-up operations involving the gas circulation exhaust based on standpipe pressure control or the conventional shut-in procedure. In view of the factors of gas migration expansion and dissolution, it is pointed out here that the equilibrium between outlet flow and inlet flow does not directly mean the stop of bottomhole gas invasion, and there is a precedence relationship between them. Based on the rapidly increasing wellhead back pressure control method, an MPD wellbore-formation coupling model for multiphase variable-mass flow was established, and the finite difference method was used to iteratively solve this model. The calculated results agreed well with the experimental measured ones. The simulation results show that the obvious inflexion point of the outlet flow is a sign for distinguishing the precedence relationship between the outlet-inlet flow equilibrium and the bottomhole gas invasion stop. Once the bottomhole gas invasion stops, the 2nd derivative of the standpipe pressure will quickly drop to near zero and keep stable thereafter. According to the above parameter variation characteristics, a real-time identification method for the bottomhole gas invasion state based on the outlet and inlet flow as well as the real-time monitored standpipe pressure was proposed. This study has guiding significance for the improvement of the MPD well control theory.
- managed pressure drilling,
- outlet and inlet flow,
- wellhead back pressure,
- standpipe pressure,
- 2nd derivative

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References(17)

References

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