Drilling through gas hydrates formations: possible problems and suggested solution

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Title: Drilling through gas hydrates formations: possible problems and suggested solution
Author: Amodu, Afolabi Ayoola
Abstract: Gas hydrate research in the last two decades has taken various directions ranging from ways to understand the safe and economical production of this enormous resource to drilling problems . as more rigs and production platforms move into deeper waters to its environmental impact on global warming and cooling . Gas hydrates are ice -like structures of a water lattice with cavities , which contain guest gases . Gas hydrates are stable at low temperatures and high pressures . The amount of energy trapped in gas hydrates all over the world is about twice the amount found in all recoverable fossil fuels today . This research identifies the problems facing the oil and gas industry as it drills in deeper waters where gas hydrates are present and suggests solutions to some of the problems . The problems considered in this research have been approached from a drilling point of view . Hence , the parameters investigated and discussed are drilling controlled parameters . They include rate of penetration , circulation rate and drilling fluid density . The rate of penetration in offshore wells contributes largely to the final cost of the drilling process . These 3 parameters have been linked in the course of this research in order to suggest an optimum rate of penetration . The results show the rate of penetration is directly proportional to the amount of gas released when drilling through gas hydrate . As the volume of gas released increases , the problems facing the drilling rigs , drilling crew and environment is seen to increase . The results also show the extent of risk to be expected while drilling through gas hydrate formations . A chart relating the rate of penetration , circulation rate and effective mud weight was used to select the optimum drilling rate within the drilling safety window . Finally , future considerations and recommendations in order to improve the analyses presented in this work are presented . Other drilling parameters proposed for future analysis include drill bit analysis with respect to heat transfer and the impact of dissociation of gas hydrate around the wellbore and seafloor stability .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3033
Date: 2009-05-15

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Drilling through gas hydrates formations: possible problems and suggested solution. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3033 .

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