辛酸异丙酯和亚麻酸异丙酯合成液作为深水钻井作业中的新型替代品:关键流体特性和好氧生物降解性评估

IF 4.2 Q2 ENERGY & FUELS
Adewale Johnson Folayan , Adewale Dosunmu , Aleruchi Boniface Oriji
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引用次数: 0

摘要

目前用于深水井的钻井液对环境有严重的恶化作用,而且操作和处理成本高昂。因此,近来这些钻井液已不再受欢迎。酯类合成钻井液提供了一种新型的环境友好型替代品,但传统的酯类钻井液在深水井中表现出较高的粘度,导致当量循环密度(ECD)过高,并由于泥浆密度窗口较窄而增加了循环损失的风险。本研究通过实验研究了两种新开发的深水合成酯类钻井液(辛酸异丙酯(COIPE)和亚麻酸异丙酯(LOIPE))的关键流体特性和好氧生物降解潜力,并将其与合成石蜡(SP-SBF)和异构化烯烃(IO-SBF)合成碳氢化合物流体进行了比较。辛酸异丙酯和亚麻酸异丙酯是分别从椰子油和亚麻籽植物油生物质的均相催化酯交换反应中分离得到的酯类混合物中生产出来的。通过低压分馏技术从椰子油异丙酯混合物中分离出 COIPE。亚麻籽油异丙酯混合物中的 LOIPE 酯则是通过分馏和结晶分离出来的。同时,采用改良的耗氧量呼吸测定法进行了有氧生物降解研究。COIPE 和 LOIPE 的气相色谱-质谱分析表明,前者主要含有低饱和碳化合物(C8)。而后者含有较高分子量和不饱和碳化合物(C18+)。COIPE 和 LOIPE 的运动粘度值与参考合成碳氢化合物流体样本(SP-SBF 和 IO-SBF)的运动粘度值非常一致。不过,COIPE 合成酯的粘度值较低,这是因为它含有较短的碳链和饱和碳原子(C8 酯)。同样,亚麻油异丙酯由于含有较高浓度的多不饱和亚麻酸酯,因此浊点和倾点值较低,在深水井钻探中具有优异的冷流特性。在好氧条件下,辛酸异丙酯和亚麻酸异丙酯合成液在海水接种体中很容易生物降解。不过,辛酸异丙酯本身是可以生物降解的,因为在 10 天的窗口期内,其降解水平和参考化学样本的降解水平都已超过 60%。SP-SBF 和 IO-SBF 合成液体的有氧生物降解值较低,因为从它们的 GC-MS 图谱可以看出,它们含有少量的多芳烃。最后,与石蜡合成液体相比,酯类和不饱和合成液体的生物降解速度更快,而且有机化合物的生物降解速度随着分子量的增加而降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Iso-propyl caprylate and iso-propyl linolenate synthetic fluids as novel alternatives in deep-water drilling operations: Critical fluid properties and aerobic biodegradability assessments

Present drilling fluids for deep water wells have severe degenerative effect on the environment with high operational and disposal costs. Thus, making them less desirable in recent times. Ester synthetic drilling fluid provides a novel environmentally friendly alternative but conventional ester-based drilling fluids exhibit high viscosities in deep-water wells causing excessive equivalent circulating density (ECD) and increased risk of lost circulation owing to narrow mud density window. This study experimentally investigates the critical fluid properties and aerobic biodegradability potentials of two newly developed deep-water synthetic ester drilling fluids namely: iso-propyl caprylate (COIPE) and iso-propyl linolenate (LOIPE) synthetic fluids and their comparison with synthetic-paraffin (SP-SBF) and isomerized-olefin (IO-SBF) synthetic hydrocarbon fluids. The esters of iso-propyl caprylate and iso-propyl linolenate were produced from the isolation of ester mixtures that were obtained from the homogeneous catalytic transesterification of coconut and linseed plant oil biomass respectively. The COIPE was isolated from the coconut oil iso-propyl ester mixture by low-pressure fractional distillation technique. While fractional distillation and crystallization were used to isolate the LOIPE ester from the linseed oil iso-propyl ester mixture. Meanwhile, the aerobic biodegradation investigation was conducted by a modified oxygen consumption respirometry technique. The GC-MS analysis of the COIPE and LOIPE showed that the former contains essentially of lower saturated carbon compounds (C8). Whereas the latter contains higher molecular weight and unsaturated carbon compounds (C18+). The COIPE and LOIPE kinematic viscosity values are in good agreement with that of the reference synthetic hydrocarbon fluid samples (SP-SBF and IO-SBF). Although, the COIPE synthetic ester has lower viscosity value owing to the presence of shorter chain and saturated carbon atoms (C8 esters). Similarly, the linolenic oil iso-propyl ester has excellent cold flow characteristics for deep-water well drilling owing to lower values of cloud and pour points as a result of higher concentration of poly-unsaturated linolenic esters. The iso-propyl caprylate and the iso-propyl linolenate ester synthetic fluids are readily biodegradable in the sea water inoculum under aerobic condition. However, the iso-propyl caprylate is inherently biodegradable because its degradation level and that of the reference chemical sample were already above 60% during the 10-day window period. The SP-SBF and the IO-SBF synthetic fluids have lower aerobic biodegradation values because they contain little quantity of poly aromatic hydrocarbons as evident in their GC-MS profiles. Finally, esters and unsaturated synthetic-based fluid are more rapidly biodegradable than paraffinic synthetic fluids and the rate of biodegradation of organic compounds decreases as molecular weight increases

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来源期刊
Petroleum
Petroleum Earth and Planetary Sciences-Geology
CiteScore
9.20
自引率
0.00%
发文量
76
审稿时长
124 days
期刊介绍: Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing
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