Well Control Procedures for Dual Gradient Drilling as Compared to Conventional Riser Drilling

2006 ◽  
Vol 21 (04) ◽  
pp. 287-295 ◽  
Author(s):  
Jerome J. Schubert ◽  
Hans C. Juvkam-Wold ◽  
Jonggeun Choe
Keyword(s):  
Well Control ◽  
Control Procedures ◽  
Dual Gradient

MANAGEMENT OF THE UNIACKE G-72 INCIDENT

1985 ◽  
Vol 1985 (1) ◽  
pp. 311-313 ◽  
Author(s):  
S. D. Gill ◽  
C. A. Bonke ◽  
J. Carter
Keyword(s):  
Monitoring Program ◽  
Chemical Properties ◽  
Well Being ◽  
Gas Well ◽  
Well Control ◽  
Drilling Rig ◽  
Sampling Program ◽  
Control Procedures ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACT During the evening of February 22, 1984, the Uniacke G-72 gas well being drilled 150 nautical miles off Halifax, Nova Scotia, by the semisubmersible drilling rig, Vinland, under contract to Shell Canada Resources, blew out of control, emitting gas and condensate at an estimated rate of 300 bbl per day. During the following 10 days while Shell was assembling personnel, vessels, and equipment for reboarding the rig and initiating well control procedures, a comprehensive environmental monitoring program was put in place. An air, slick, and water column sampling program was initiated to provide information on the physical and chemical properties of the condensate. This paper describes the primary findings of the program that involved the coordination of government, area petroleum operators, and consultants.

Analysis of Field Trial Well Control Results with a Dual Gradient Drilling System

2015 ◽  
Author(s):  
E. Hauge ◽  
J.M. Godhavn ◽  
D.O. Molde ◽  
J.H Cohen ◽  
R.S. Stave ◽  
...  
Keyword(s):  
Field Trial ◽  
Well Control ◽  
Drilling System ◽  
Dual Gradient

Dual Gradient Drilling Will Control Shallow Hazards in Deepwater Environments

2009 ◽  
Author(s):  
Brandee A. Elieff ◽  
Jerome J. Schubert
Keyword(s):  
Shallow Water ◽  
Closed System ◽  
Drilling Fluid ◽  
Detection Methods ◽  
Methane Hydrates ◽  
Shallow Gas ◽  
Well Control ◽  
Water Flows ◽  
Shallow Water Flows ◽  
Dual Gradient

Currently the “Pump and Dump” method employed by Exploration and Production (E&P) companies in deepwater is simply not enough to control increasingly dangerous and unpredictable shallow hazards. “Pump and Dump” requires a heavy dependence on accurate seismic data to avoid shallow gas zones; the kick detection methods are slow and unreliable, which results in a need for visual kick detection; and it does not offer dynamic well control methods of managing shallow hazards such as methane hydrates, shallow gas and shallow water flows. These negative aspects of “Pump and Dump” are in addition to the environmental impact, high drilling fluid (mud) costs and limited mud options. Dual gradient technology offers a closed system, which improves drilling most simply because the mud within the system is recycled. The amount of required mud is reduced, the variety of acceptable mud types is increased and chemical additives to the mud become an option. This closed system also offers more accurate and faster kick detection methods in addition to those that are already used in the “Pump and Dump” method. It has the potential to prevent the formation of hydrates by adding hydrate inhibitors to the drilling mud. And more significantly, this system successfully controls dissociating methane hydrates, over pressured shallow gas zones and shallow water flows. Dual gradient technology improves deepwater drilling operations by removing fluid constraints and offering proactive well control over dissociating hydrates, shallow water flows and over pressured shallow gas zones. There are several clear advantages for dual gradient technology: economic, technical and significantly improved safety, which is achieved through superior well control.

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