Top hole drilling with dual gradient technology to control shallow hazards

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Title: Top hole drilling with dual gradient technology to control shallow hazards
Author: Elieff, Brandee Anastacia Marie
Abstract: 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 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 . This closed system 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 .
URI: http : / /hdl .handle .net /1969 .1 /4441
Date: 2006-10-30

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Top hole drilling with dual gradient technology to control shallow hazards. Available electronically from http : / /hdl .handle .net /1969 .1 /4441 .

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