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A dynamic managed pressure well-control method for rapid treatment of gas kick in deepwater managed pressure drilling 被引量:1
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作者 Hong-Wei Yang Jun Li +4 位作者 Ji-Wei Jiang Hui Zhang Bo-Yun Guo Geng Zhang Wang Chen 《Petroleum Science》 SCIE CAS CSCD 2022年第5期2297-2313,共17页
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... 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. 展开更多
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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Approximately-Balanced Drilling in Daqing Oilfield
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作者 XiaBairu ZhengXiuhua +1 位作者 LiGuoqing TianTuo 《Journal of China University of Geosciences》 SCIE CSCD 2004年第1期128-132,共5页
关键词 approximately-balanced drilling pore pressure reasonable negative pressure value density of drilling fluid pressure discharge for drilling well.
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Research on remote intelligent control technology of throttling and back pressure in managed pressure drilling 被引量:3
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作者 He Zhang Yongzhi Qiu +2 位作者 Haibo Liang Yunan Li Xiru Yuan 《Petroleum》 CSCD 2021年第2期222-229,共8页
In order to reduce the non production time of drilling,improve the efficiency and safety of drilling,improve the economic effect of managed pressure drilling(MPD),and realize the intelligent control construction of di... In order to reduce the non production time of drilling,improve the efficiency and safety of drilling,improve the economic effect of managed pressure drilling(MPD),and realize the intelligent control construction of digital oilfield.Based on the pressure control in MPD,this paper analyzes the pressure control drilling system,takes the wellhead back pressure as the controlled parameter,calculates the mathematical model of the throttle valve according to the characteristics of the throttle valve,the basic parameters and boundary conditions of pressure control drilling,and puts forward an improved particle swarm Optimization PID neural network(IPSO-PIDNN)model.By means of remote communication,VR technology can realize remote control of field control equipment.The real-time control results of IPSO-PIDNN are compared with those of traditional PID neural network(PIDNN)and traditional Particle Swarm Optimization PID neural network(PSO-PIDNN).The results show that IPSO-PIDNN model has good self-learning characteristics,high optimization quality,high control accuracy,no overshoot,fast response and short regulation time.Thus,the advanced automatic control of bottom hole pressure in the process of MPD is realized,which provides technical guarantee for the well control safety of MPD. 展开更多
关键词 Managed pressure drilling(MPD) IPSO-PIDNN algorithm Throttling back pressure Intelligent control
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Flow field simulation of supercritical carbon dioxide jet: Comparison and sensitivity analysis 被引量:5
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作者 王海柱 李根生 +3 位作者 田守嶒 程宇雄 贺振国 于水杰 《Journal of Hydrodynamics》 SCIE EI CSCD 2015年第2期210-215,共6页
As a new jet technology developed in recent years, the supercritical carbon dioxide(SC-CO2) jet technology enjoys many advantages when applied in oil and gas explorations. In order to study the properties and parame... As a new jet technology developed in recent years, the supercritical carbon dioxide(SC-CO2) jet technology enjoys many advantages when applied in oil and gas explorations. In order to study the properties and parametric influences of the SC-CO2 jet, the flow fields of the SC-CO2 jet are simulated using the computational fluid dynamics method. The flow field of the SC-CO2 is compared with that of the water jet. The influences of several parameters on the flow field of the SC-CO2 jet are studied. It is indicated that like the water jet, the velocity and the pressure of the SC-CO2 jet could be converted to each other, and the SC-CO2 jet can generate a significant impact pressure on the wall, the SC-CO2 jet has a stronger impact pressure and a higher velocity than those of the water jet under the same conditions, the maximum velocity and the impact pressure of the SC-CO2 jet increase with the increase of the nozzle pressure drop, under the stimulation condition of this study, the influence of the SC-CO2 temperature on the impact pressure can be neglected in engineering applications, while the maximum velocity of the SC-CO2 jet increases with the increase of the fluid temperature. This paper theoretically explores the properties of the SC-CO2 jet flow field, and the results might provide a theoretical basis for the application of the SC-CO2 jet in oil and gas well drillings and fracturing stimulations. 展开更多
关键词 supercritical carbon dioxide water jet confining pressure flow field drilling
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Revisiting fracture gradient:Comments on“A new approaching method to estimate fracture gradient by correcting MattheweKelly and Eaton's stress ratio”
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作者 Farizal Hakiki Muizzuddin Shidqi 《Petroleum》 2018年第1期1-6,共6页
A study performed by Marbun et al.[1]claimed that“A new methodology to predict fracture pressure from former calculations,MattheweKelly and Eaton are proposed.”Also,Marbun et al.'s paper stated that“A new value... A study performed by Marbun et al.[1]claimed that“A new methodology to predict fracture pressure from former calculations,MattheweKelly and Eaton are proposed.”Also,Marbun et al.'s paper stated that“A new value of Poisson's and a stress ratio of the formation were generated and the accuracy of fracture gradient was improved.”We found those all statements are incorrect and some misleading concepts are revealed.An attempt to expose the method of fracture gradient determination from industry practice also appears to solidify that our arguments are acceptable to against improper Marbun et al.'s claims. 展开更多
关键词 Fracture gradient Overburden pressure Pore pressure MattheweKelly's stress ratio Eaton's stress ratio Poisson's ratio Pressure safety drilling window GEOMECHANICS
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