• Document: A Review Over Major Gas Blowouts In Bangladesh, Their Effects And The Measures To Prevent Them In Future
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INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH VOLUME 3, ISSUE 9, SEPTEMBER 2014 ISSN 2277-8616 A Review Over Major Gas Blowouts In Bangladesh, Their Effects And The Measures To Prevent Them In Future Md. Ashraful Islam Khan, Fuad Bin Nasir Abstract: In petroleum industry, gas blowout is one of the major hazards, causing damage to the reservoir and gas bearing formation, destructing the drilling rig, damaging the environment and so on. Many blowouts had happened in Bangladesh in the past and among them Sylhet-1(1955), Sylhet- 4(1962), Moulvibazar-1(1997) and Chattak-2 (2005) gas field‟s blowouts were more destructive. Chattak-2 (known as Magurchara) had been affected twice by blowouts. The main target of this paper is to discuss the reasons behind these blowouts, their effects, both in the environmental and petroleum industrial aspects. As the losses are unrecoverable, so we must prevent blowout and in this paper, we recommend some preventive measure to avoid blowouts in the future. Keywords: Gas blowout, Sylhet-1, Sylhet-4, Moulvibazar-1, Chattak-2, Blowout effects, Blowout prevention. ———————————————————— 1. Introduction: The 80% of the gas fields of Bangladesh discovered so far Natural gas, a primary source of energy, has a critical role are located in the eastern part of Bangladesh. The three in socio-economic development of Bangladesh. Its gas fields named Sylhet, Maulvibazar and Chattak which extensive use in generating power, producing fertilizer, are affected by blowout are located in eastern fold bed. So running industry and households activities has made it the our main concern is to discuss the eastern fold bed of prime need of the country and it accounts for about 73% of Bangladesh. commercial energy of Bangladesh. It is comparatively cheaper than other energy sources, which are imported from abroad. The availability of low cost fuel provides a competitive edge to the industrial products [1]. The use of natural as alternative fuel has been growing in recent years due to the considerable economic and environmental advantages and therefore, become more conventional fuel in internal combustion engines [2]. A powerful flow of gas into the drill string resulting, which causes the gas to come up to the surface and creating kick in the rig floor violently [3]. Our study is focused on some major blowouts (Sylhet-1, 4; Moulvibazar-1; Chattak-2) occurred in Bangladesh and to identify the causes of those accidents, effects and some preventive measure to impede it in future. 2. Geological characteristics of gas field in Bangladesh: The geology of Bangladesh may be divided into three hydrocarbon geological provinces and they are- i) The folding bed in the eastern part of Bangladesh, ii) The fore deep in the central part of Bangladesh and iii) The stable shelf and hinge zone in the west-northwest part of Bangladesh[3]. Fig. 1. Gas fields and tectonic unit of Bangladesh [3]. ___________________________ 2.1. Eastern fold bed of Bangladesh: The area extends north to south along the eastern part of  Md. Ashraful Islam Khan, Department of Petroleum & Bangladesh which includes Sylhet, Comilla, Chittagong and Mining Engineering, Shahjalal University of Science Cox‟s Bazar where the sedimentary sequence in the fold & Technology, Sylhet, Bangladesh. belt measures up to about 20 km in the Sylhet area [4]. In E-mail: sarjilsust09@gmail.com addition, the gas of this zone has been generated at the depth of 6000 to 8000 meter below the surface and  Fuad Bin Nasir, Department of Civil & Environmental migrated up through multi-kilometer sand shale sequence Engineering, Shahjalal University of Science & for long vertical distance before being accumulated in the Technology, Sylhet, Bangladesh. Mio-Pliocene sand reservoirs[5]. The reservoirs of the gas E-mail: binnasir.fuad@gmail.com in the fold belt of the eastern part of Bangladesh are all Mio- Pliocene age sandstones, which are generally occurred in

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