一种用于天然气水合物和石油储层热增产的逆流换热反应器

J. Schicks, E. Spangenberg, Ronny Giese, M. Luzi-Helbing, M. Priegnitz, K. Heeschen, B. Strauch, J. Schrötter, J. Kück, Martin Töpfer, J. Klump, J. Thaler, Sven Abendroth
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引用次数: 4

摘要

在GFZ德国地球科学研究中心,我们开发了一种安全有效的方法,通过在储层内提供热量来分解天然气水合物。热量是通过在逆流热交换反应器中甲烷的催化燃烧就地产生的。密西西比州立大学化学工程荣誉教授鲁迪·罗杰斯(Rudy Rogers)称之为“希克斯燃烧器”的反应堆被放置在一个钻孔中,这样热反应区就位于水合物层的区域。GFZ开发的逆流热交换反应器通过在贵金属催化剂上对甲烷进行无焰催化氧化来产生热量。该系统是封闭的,即反应物、催化剂和环境没有接触。出于安全考虑,甲烷和空气分别通过管中管的布置进入混合室。由于其冷却效果和安全原因,使用空气代替纯氧。气体混合物从混合室到达催化剂床上,在那里甲烷和氧气被转化为二氧化碳和水。热产物气体通过铝泡沫将热量释放到反应堆的外壁,然后释放到环境中。同时,进入的气体被预热。反应在673 ~ 823 K之间稳定自主运行。逆流换热反应器设计为实验室反应器和井下工具。为了研究含天然气水合物沉积物的传热特性,在储层模拟器上对实验室反应器进行了测试。因此,在体积为425 l的高压灭菌器(LARS)中生成甲烷水合物。在水合物饱和度为80%的试验中,在催化剂点火后12小时内,储层模拟器进行升温,使完整样品的温度高于先前形成的甲烷水合物的解离温度,该甲烷水合物解离完全,因此可以产生甲烷。在这个测试中,只有15%的产生的CH4被消耗来产生水合物热解离所需的能量。利用实验室反应器的经验,设计了一种适用于天然气水合物储层的钻孔工具。该井眼工具全长5120毫米,外径90毫米,重约100公斤。在德国Windischeschenbach的KTB大陆深钻现场测试的第一个结果证实,该钻孔工具可以可靠地在深度产生热量。
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A Counter-Current Heat-Exchange Reactor for the Thermal Stimulation of Gas Hydrate and Petroleum Reservoirs
At the GFZ German Research Centre for Geosciences we have developed a safe and efficient method which allows for the decomposition of gas hydrates by the supply of heat inside the reservoir. The heat is generated in situ by a catalytic combustion of methane in a counter-current heat-exchange reactor. The reactor that Rudy Rogers, Professor Emeritus in Chemical Engineering at Mississippi State University, referred to as the "Schicks Combustor" is placed in a borehole in such way that the hot reaction zone is situated in the area of the hydrate layer. The counter-current heat-exchange reactor developed at GFZ generates heat via a flameless catalytic oxidation of methane at a noble metal catalyst. The system is closed i.e. there is no contact of the reactants, catalyst and environment. For safety reasons, methane and air are fed separately through a tube-in-tube arrangement into the mixing chamber. Due to its cooling effect and for safety reasons air instead of pure oxygen is used. From the mixing chamber the gas mixture arrives in defined quantities on the catalyst bed, where methane and oxygen are converted into carbon dioxide and water. The hot product gases release their heat via an aluminum foam to the outer wall of the reactor and then to the environment. Simultaneously, the incoming gases are preheated. The reaction runs stable and autonomous between 673 and 823 K. The counter-current heat-exchange reactor was designed as a lab reactor and a borehole tool. The lab reactor was tested in a reservoir simulator to investigate the heat transfer into gas hydrate bearing sediments. Therefore methane hydrate was generated in the LArge Reservoir Simulator (LARS), an autoclave with a volume of 425 L. In a test with 80% hydrate saturation, the reservoir simulator warmed up within 12 hours after the ignition of the catalyst to such an extent that the temperature of the complete sample was above the dissociation temperature of the previously formed methane hydrate which dissociated completely and methane could therefore be produced. During this test, only 15% of the produced CH4 was consumed to generate the energy needed for the thermal dissociation of the hydrates. The experience with the laboratory reactor served as basis for the design of a borehole tool which is suitable for the application in natural gas hydrate reservoirs. The borehole tool has a total length of 5120 mm, an outer diameter of 90 mm and weighs ca. 100 kg. First results from field tests at the continental deep drilling site KTB in Windischeschenbach, Germany, confirm that the borehole tool reliably produces heat at depth.
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