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A dynamic managed pressure well-control method for rapid treatment of gas kick in deepwater managed pressure drilling

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Petroleum Science 2022年第5期19卷 2297-2313页

作者： Hong-Wei Yang Jun Li Ji-Wei Jiang Hui Zhang Bo-Yun Guo Geng Zhang Wang Chen China University of Petroleum-Beijing Beijing102249China China University of Petroleum-Beijing at Karamay Karamay834000XinjiangChina CNPC Engineering Technology R&D Company Limited Beijing102206China University of Louisiana at Lafayette LafayetteLA70504USA

During deepwater managed pressure drilling(MPD),the gas kick may occur in abnormally high-pressure formations.If the traditional well control method is adopted,the treatment time is long and the advantage of early gas kick detection of MPD is lost.The dynamic managed pressure well-control(MPWC)method can be used to rapidly treat gas kick in deepwater MPD.In this paper,considering the effect of large-variable-diameter annulus and complex wellbore temperature in deepwater drilling,a simplified model of non-isothermal gas-liquid two-phase flow was established for dynamic deepwater MPWC simulation.Using this model,the response characteristics of outlet flow and wellhead backpressure were investigated.The results indicated that the gas fraction,outlet liquid flow rate,pit gain and wellhead backpressure presented complex alternating characteristics when gas moved upwards in the wellbore due to the large-variable-diameter annulus.The outlet liquid flow rate would be lower than the inlet flow rate and the pit gain would decrease before the gas moved to the wellhead.The variation trend of the wellhead backpressure was consistent with that of the pit gain.When the gas-liquid mixture passed through the choke,the expansion or compression of the gas caused part of the choke pressure drop to be supplemented or unloaded,delaying the response rate of the wellhead backpressure.The wellbore temperature,borehole diameter and seawater depth had different effects on outlet flow rate,pit gain and wellhead backpressure.This research could provide a new idea for well control methods in deepwater managed pressure drilling.

关键词： gas kick Managed pressure well-control gas-liquid two-phase flow Wellhead backpressure Outlet flow characteristics Deepwater managed pressure drilling

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Evolution of gas kick and overflow in wellbore and formation pressure inversion method under the condition of failure in well shut-in during a blowout

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Petroleum Science 2022年第2期19卷 678-687页

作者： Guo-Shuai Ju Tie Yan Xiao-Feng Sun Jing-Yu Qu Qiao-Bo Hu College of Petroleum Engineering Northeast Petroleum UniversityDaqing163318HeilongjiangPeople's Republic of China

With ongoing development of oil exploration and techniques,there is a significant need for improved well control strategies and formation pressure prediction methods.In this paper,a gas-liquid transient drift flow model was established according to the gas-liquid two-phase flow characteristics during the gas kick.A Roe scheme was used for numerical calculation based on the finite volume method.The changes of bottom-hole pressure,casing pressure,the development law of cross-sectional gas holdup,and gas velocity,along with the vertical well depth,were analyzed through simulation examples.The time-series characteristics of mud pit gain were obtained by adjusting the formation parameter.The complex nonlinear mapping relationship between the formation parameters and the mud pit gain was established.The long short-term memory network(LSTM)of deep learning was used to obtain a formation pressure inversion when the blowout is out of control and the well cannot be shut-in.Experimental data from a well were used to verify the gas-liquid two-phase transient drift flow model based on the finite volume method,demonstrating that this method is reliable,with greatly improved prediction accuracy.This approach provides theoretical support for the early monitoring of gas kick during drilling,and for well-killing design and construction after uncontrolled blowout.

关键词： gas kick Formation pressure Multiphase flow Computational model Long short-term memory

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Deepwater gas kick simulation with consideration of the gas hydrate phase transition

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Journal of Hydrodynamics 2014年第1期26卷 94-103页

作者：王志远孙宝江 School of Petroleum Engineering China University of Petroleum (East China)

The hydrate phase transition presents new problems and challenges for the deepwater well control in the drilling processes. A simulation model is built for deepwater gas kicks with consideration of the hydrate phase transition. The model is based on the multiphase flow governing equations and the hydrate phase transition calculation equations. The influence of the hydrate phase tran-sition on the gas kick hydraulics is investigated through numerical simulations. It is shown that the diameter of the gas bubbles can significantly influence the hydrate phase transition effect. The influence of the hydrate phase transition on the gas kick hydraulics in-creases with the decrease of the average gas bubble diameter. The hydrate phase transition adds a＂hidden＂nature for the well kick in deepwater and hinders the early detection of the gas kick. The influence of the hydrate phase transition on the gas kick hydraulics is also studied in the case when the hydrate inhibitor is added to the drilling fluid.

关键词： deepwater gas kick simulation gas hydrate phase transition

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Annular multiphase flow behavior during deep water drilling and the effect of hydrate phase transition

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Petroleum Science 2009年第1期6卷 57-63页

作者： Wang Zhiyuan Sun Baojiang School of Petroleum Engineering China University of Petroleum （East China） Dongying Shandong 257061 China

It is very important to understand the annular multiphase flow behavior and the effect of hydrate phase transition during deep water drilling. The basic hydrodynamic models, including mass, momentum, and energy conservation equations, were established for annular flow with gas hydrate phase transition during gas kick. The behavior of annular multiphase flow with hydrate phase transition was investigated by analyzing the hydrate-forming region, the gas fraction in the fluid flowing in the annulus, pit gain, bottom hole pressure, and shut-in casing pressure. The simulation shows that it is possible to move the hydrate-forming region away from sea floor by increasing the circulation rate. The decrease in gas volume fraction in the annulus due to hydrate formation reduces pit gain, which can delay the detection of well kick and increase the risk of hydrate plugging in lines. Caution is needed when a well is monitored for gas kick at a relatively low gas production rate, because the possibility of hydrate presence is much greater than that at a relatively high production rate. The shut-in casing pressure cannot reflect the gas kick due to hydrate formation, which increases with time.

关键词： Annular multiphase flow phase transition natural gas hydrate gas kick

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