Review on the Vibration Mechanism of Drill String During Natural Gas Exploitation
Wang Baojin,
Zhang Wenrui,
Yuan Hong,
Wang Liuci
Issue:
Volume 11, Issue 5, September 2022
Pages:
91-101
Received:
19 September 2022
Accepted:
18 October 2022
Published:
24 October 2022
DOI:
10.11648/j.ijepe.20221105.11
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Abstract: Gas hydrate, also known as combustible ice, is a pollution-free and clean energy source with huge reserves, so it is widely recognized as an energy source to replace oil. In the process of drilling and exploitation, a large amount of gas is generated by the decomposition of hydrate, which leads to the transformation of the single fluid (drilling fluid) into gas-liquid two-phase flow in the annulus. The constant change of the characteristic parameters of gas-liquid two-phase flow will aggravate the vibration frequency of the drill string. Combustible ice as sediment cement exist, can affect the strength of the sediment, and induce the occurrence of geological hazards, such as underwater landslides, and technical conditions for the present mining cost is too high, so it is necessary to in-depth analysis of the phenomenon, this paper introduced the research present situation and the drill string mechanics when there is a gas liquid two phase flow in the annulus, The research status of the influence of annulus fluid on drill string vibration is aimed to review the relevant literature on the influence of annulus fluid on drill string vibration, and to provide reference for the study of drill string dynamics in gas hydrate drilling and production.
Abstract: Gas hydrate, also known as combustible ice, is a pollution-free and clean energy source with huge reserves, so it is widely recognized as an energy source to replace oil. In the process of drilling and exploitation, a large amount of gas is generated by the decomposition of hydrate, which leads to the transformation of the single fluid (drilling fl...
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Installation of Solar Carport for the Provision of Car Shade and Lighting of Staff Quarter in Admiralty University of Nigeria (ADUN), Delta State
Dioha IFeabunike Joseph,
Chidozie Ekene,
Nnabugwu Chinyere Peace
Issue:
Volume 11, Issue 5, September 2022
Pages:
102-109
Received:
18 August 2022
Accepted:
13 September 2022
Published:
22 November 2022
DOI:
10.11648/j.ijepe.20221105.12
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Abstract: A study of a 3.5kW solar carport for the provision of car shade and lighting of staff quarter in the Admiralty University of Nigeria, Delta State has been conducted. The energy audit of the staff quarter showed that 120kWh of energy is consumed for the lighting of staff quarter. This study includes the efficient lighting of the staff quarter and the provision of a carport for the university. Energy-saving lamps (LEDs) are used to reduce the staff quarter’s lighting energy consumption from 120kWh to 51.4kWh. Cars exposed to the atmosphere without shade are prone to atmospheric, thermal, and oxidative degradations as well as degradation caused by ultraviolet radiation (UV). The adverse condition that the cars are exposed to, at different seasons of the year will reduce the life span of the cars. The calculated average cost for the installation of 3.5kW solar photovoltaic car park for Life Cycle Cost (LCC) of 7 years is eleven thousand and eighty eight dollars ($11,088:00) while the LCC of operating 3.5 kW (4.38KVA) is fourteen thousand three hundred and thirty six dollars, ten cents ($14,336.10) excluding the cost of atmospheric degradation of the environment by SOx, NOx, CO2, CO emissions and also noise pollution from the generator.
Abstract: A study of a 3.5kW solar carport for the provision of car shade and lighting of staff quarter in the Admiralty University of Nigeria, Delta State has been conducted. The energy audit of the staff quarter showed that 120kWh of energy is consumed for the lighting of staff quarter. This study includes the efficient lighting of the staff quarter and th...
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Research and Application of Nitrogen Assisted for Offshore Fracturing Fluid Flowback
Du Weigang,
Chen Xing,
Duan Wei,
Li Meng,
Gao Xiangtao
Issue:
Volume 11, Issue 5, September 2022
Pages:
110-113
Received:
8 October 2022
Accepted:
16 November 2022
Published:
29 November 2022
DOI:
10.11648/j.ijepe.20221105.13
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Abstract: With the deepening of offshore oil exploration and development, low-permeability reservoirs are gradually entering the development plan. Low permeability reservoirs must be commercially exploited by production enhancement measures due to their low production and poor economic efficiency. Therefore, the production enhancement technology mainly fracturing technology has been developed rapidly and also become an important technology for the development of offshore low permeability reservoirs. In this paper, through the investigation, statistics, and analysis of the timing of each part of fracturing construction for medium-sized fracturing wells offshore, we found that the fracturing fluid drainage time is long during the fracturing construction process. The fracturing fluid re-discharge efficiency issue becomes an important factor affecting the fracturing cost and period. Different methods of fracturing fluid drainage are analyzed, and this paper focuses on the applicability of different drainage processes after fracturing in non-self-injected wells. Nitrogen-assisted drainage is preferred as the main means of offshore fracture fluid drainage through analysis. Through the analysis and optimization of the nitrogen-assisted fracturing fluid flowback process, the preferred methods of nitrogen-assisted fluid flowback pressure and auxiliary fluid flowback timing are proposed. Field application and practice show that after adopting nitrogen annular auxiliary drainage process, the fluid flowback volume increases obviously, the oil pressure at the wellhead increases significantly, and the fracturing fluid flowback efficiency improves remarkable.
Abstract: With the deepening of offshore oil exploration and development, low-permeability reservoirs are gradually entering the development plan. Low permeability reservoirs must be commercially exploited by production enhancement measures due to their low production and poor economic efficiency. Therefore, the production enhancement technology mainly fract...
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