Insights into oil cracking based on laboratory experiments
Insights into oil cracking based on laboratory experiments
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DOI：
10.1016/s0146-6380(03)00173-6
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发表时间：
2003-01-01
影响因子：
3
通讯作者：
Kaplan, IR
中科院分区：
文献类型：
--
作者：
Hill, RJ;Tang, YC;Kaplan, IR
该热解研究的目的是确定（1）石油成分、（2）气体成分和（3）气体碳同位素比值的变化，并将这些结果与储层中的烃类进行比较。在T=350-450 degreesC，P=650 bar和时间范围从24小时到33天的条件下，通过密闭干燥热解对富含饱和物的泥盆纪石油进行了实验室裂解。增加的热应力导致C1 - 5+烃馏分裂化以形成C6-14和C1-5烃和焦沥青。C6-14馏分在较高温度和延长的加热时间下继续裂解成C1-5气体加上焦沥青，并且随着油裂解的进行，Δ C-13（乙烷）-Δ C-13（丙烷）差变得更大。在产品生成和产品裂解方面存在相当大的重叠。油裂化产物的积累或者是因为任何产物的生成速率大于该产物的裂化去除速率，或者是因为该产物在实验条件下是稳定的端元。当由反应物产生的产物的量小于裂化产物的量时，油裂化产物减少。如果热解气体成分代表了自然界中石油裂解产生的气体，那么了解改变天然气成分的过程至关重要。(C)2003 Elsevier Ltd.保留所有权利。
The objectives of this pyrolysis investigation were to determine changes in (1) oil composition, (2) gas composition and (3) gas carbon isotope ratios and to compare these results with hydrocarbons in reservoirs. Laboratory cracking of a saturate-rich Devonian oil by confined, dry pyrolysis was performed at T=350-450 degreesC, P=650 bars and times ranging from 24 h to 33 days. Increasing thermal stress results in the C15+ hydrocarbon fraction cracking to form C6-14 and C1-5 hydrocarbons and pyrobitumen. The C6-14 fraction continues to crack to C1-5 gases plus pyrobitumen at higher temperatures and prolonged heating time and the delta C-13(ethane)-delta C-13(propane) difference becomes greater as oil cracking progresses. There is considerable overlap in product generation and product cracking. Oil cracking products accumulate either because the rate of generation of any product is greater than the rate of removal by cracking of that product or because the product is a stable end member under the experimental conditions. Oil cracking products decrease when the amount of product generated from a reactant is less than the amount of product cracked. If pyrolysis gas compositions are representative of gases generated from oil cracking in nature, then understanding the processes that alter natural gas composition is critical. (C) 2003 Elsevier Ltd. All rights reserved.