Ultra-Deepwater Blowout Well Control Analysis under Worst Case Blowout Scenario

2014 ◽  
Author(s):  
Zhaoguang Yuan ◽  
Yahya Hashemian ◽  
Dan R Morrell
Keyword(s):  
Control Analysis ◽  
Worst Case ◽  
Well Control

Ultra-deepwater blowout well control analysis under worst case blowout scenario

2015 ◽  
Vol 27 ◽  
pp. 122-129 ◽  
Author(s):  
Zhaoguang Yuan ◽  
Yahya Hashemian ◽  
Daniel Morrell
Keyword(s):  
Control Analysis ◽  
Worst Case ◽  
Well Control

scholarly journals Controller Performance Assessment of a Photovoltaic Generator Terminated in a Current-Mode-Buck-Convertor-Load

2019 ◽  
Vol 25 (3) ◽  
pp. 56-62 ◽  
Author(s):  
Moshe Sitbon ◽  
Martin Mellincovsky ◽  
Ilan Aharon
Keyword(s):  
Current Mode ◽  
Control Analysis ◽  
Nonlinear Behaviour ◽  
Control Task ◽  
Unstable Condition ◽  
Case Scenario ◽  
Worst Case ◽  
Controller Performance ◽  
Terminal Voltage ◽  
A Current

In this paper, a comprehensive control analysis is presented, with emphasis on regulating the terminal voltage of a photovoltaic generator, interfaced with a current mode controlled buck DC-DC converter, which is, in turn terminated by a battery. The combined generator-convertor-load system possesses nonlinear behaviour, and is subject to environmental conditions, thus causing the control task complicated. Additionally, analyses of small signal equations reveal a possible unstable condition. Hence, a new method of designing a controller for worst-case scenario is presented. Additionally, results of implementing a typical linear controller (PI), which can be designed only in reference to a single nominal operation point, revealing a varied responses. Simulation and results of mathematical analysis are presented to verify the proposed method.

Subsea Source Control Planning Solutions to Prepare Operators for Worse Case Discharge Well Events

2014 ◽  
Vol 2014 (1) ◽  
pp. 300323
Author(s):  
Michael Drieu ◽  
Jameson R. Wendell
Keyword(s):  
Emergency Response ◽  
Intervention Strategy ◽  
Source Control ◽  
Case Scenario ◽  
Worst Case ◽  
Well Control ◽  
Incident Command ◽  
Response Planning ◽  
Emergency Response Plan ◽  
Response Plan

The development of a Source Control Emergency Response Plan is one of the best ways in which an operator can ensure that the goals of their regional or project-specific Source Control emergency preparedness efforts will be met, if needed. Procedures for handling emergencies are absolutely essential to ensure the protection of life, property, and the environment. This Source Control Emergency Response Plan (SCERP) is based on decades of conventional and subsea well control experience to ensure that the planning efforts and to develop Source Control Emergency Response Planning (SCERP) through field deployment of the system in order to cap a subsea well. The aforementioned experience covers many years of source control, well control and intervention operations in conceivable operational settings and in a variety of geographic locations. The equipment and procedures specified in this SCERP address a “worst case” scenario involving a loss of well control, necessitating the immediate mobilization of intervention equipment and personnel. The primary objective of the SCERP is to establish a process for responding to and safely managing source-control emergencies using a standard, uniform approach. This process includes the following information:emergency contact information and resourcesresponse managementsource-control operational overview with strategic methodologiesorganizational staffing recommendationscheck list to guide groups and unit leaders andkey resource identification The SCERP is not intended to replace sound judgment. Modification of the mobilization plan and intervention strategy may be necessary, depending on circumstances. Subsea source-control events require common sense and professional judgment on the part of the person(s) in charge of operations, and no operation should be undertaken if it involves unreasonable risk to personnel. Additional, a Logistics Plan must be developed to support operations by identifying mobilization guidelines from the stored location for the capping stack and other support equipment necessary to secure the well. Disembarkation of the equipment clearly offering various options with estimated timelines for transporting the equipment by air, ground and sea should also be outlined to ensure equipment arrives timely and safely. Locating vessels and rigs meeting operational requirements will help ensure well incidents are managed and executed within incident-command and other expectations.

Shifting the Paradigm: The Effective Way to Use Real-Time Data for Improved and Safer Oilwell Operations

2012 ◽  
Author(s):  
David M. Pritchard ◽  
Jesse Roye ◽  
J. C. Cunha
Keyword(s):  
Real Time ◽  
Control Analysis ◽  
Time Data ◽  
Well Control ◽  
Real Time Data ◽  
Drilling Operations ◽  
Recorded Data ◽  
Well Data ◽  
The Right ◽  
Real Time Information

When analyzing root causes for minor or major problems occurring in oilwell drilling operations, investigators almost always can track past events, step by step, using recorded data that was produced when the operation occurred. In recent catastrophic blow-outs, investigators were able not only to determine the causes of the accidents but also to indicate mitigating actions, which could have prevented the accident if they were taken when the operation actually took place. This is a strong indicator that, even though the industry has valuable real-time information available, it is not using it as a tool to avoid harmful events and improve performance. Real-time data is not about well control, it is about well control avoidance. Recent catastrophic events have underscored the value of having the right kind of experience to understand and interpret well data in real time, taking the necessary corrective actions before it escalates to more serious problems. What is the well telling us? How do we use real time data to ensure a stable wellbore? Real-time monitoring, integrated with rigorous total well control analysis, is required to embrace and achieve continuous improvements — and ensure the safest possible environment. Next generation monitoring requires a step change that includes hazards avoidance as a precursor to drilling optimization. Real-time data can be used effectively in operations to avoid, minimize, and better manage operational events associated with drilling and completion. Real-time data can also provide the foundational support to improve training in the industry as well as develop hands-on simulators for hazards avoidance.

Pre-stack gather quality control and the application effect based on the well-control analysis

2018 ◽  
Author(s):  
Yahui Liu ◽  
Liping Zhou ◽  
Feng Zhu ◽  
Zhaopu Yin ◽  
Ying Luo
Keyword(s):  
Quality Control ◽  
Control Analysis ◽  
Well Control

Multi-Phase Well Control Analysis During Managed Pressure Drilling Operations

2016 ◽  
Author(s):  
Z. Ma ◽  
A. Karimi Vajargah ◽  
A. Ambrus ◽  
P. Ashok ◽  
D. Chen ◽  
...  
Keyword(s):  
Control Analysis ◽  
Well Control ◽  
Managed Pressure Drilling ◽  
Drilling Operations ◽  
Multi Phase
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