Physical Simulation Study of In-Situ Combustion by a Chemical Self-Propagating Igniter
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摘要: 采用电点火火烧油层工艺开采稠油油藏时，存在点火温度高、点火成功率低等问题，为此引入自蔓燃技术，提出了自蔓燃化学点火方式。根据自蔓燃原理，以硝酸铵和柠檬酸为主要原料制备了自蔓燃点火剂，并制备了模拟岩心，然后在模拟试验装置上进行了模拟点火试验，分析了原油黏度、岩心孔隙度、含油饱和度、原油含水率对模拟岩心燃烧的影响。试验结果显示，自蔓燃点火剂的点火温度仅为100~200℃，最低可达98℃；随原油黏度升高，点火剂的点火温度升高；岩心孔隙度不影响点火剂的点火温度，但孔隙度越大，原油的燃烧程度和最高燃烧温度越高；含油饱和度不影响点火剂的点火温度和原油的最高燃烧温度，但含油饱和度越大原油燃烧程度越高；原油含水率对点火剂的点火温度、原油燃烧的最高温度和燃烧程度均有影响，原油含水率越低，点火温度越低，最高燃烧温度越高，燃烧程度越高。研究结果表明，自蔓燃化学点火能够安全可靠地点燃原油并进行火烧油层驱油。Abstract: The technology of electric ignition and in-situ combustion for heavy oil reservoir suffers from the fact that it has a high ignition temperature and a low ignition success rate.A chemical self-propagating igniter was introduced to solve these problems.Its effect and influence factors were analyzed by physical simulation.According to the principle of self-propagating,the ignition agent was prepared with ammonium nitrate and citric acid as the main raw material,and the simulated core was prepared.The simulated ignition test was carried out on a simulated test device.The influence of the viscosity of crude oil,core porosity,oil saturation and water content of crude oil on the combustion of simulated core was analyzed through experiments.The results showed that the ignition temperature of self-propagating igniting agent was only 100-200℃,and the minimum temperature was 98℃.The ignition temperature of igniter increased with the increasing of viscosity of crude oil.The porosity of the core did not affect the ignition temperature,but the degree of combustion and the highest combustion temperature could increase with the increasing porosity of the core.The oil saturation did not affect the ignition temperature and the highest burning temperature of the crude oil,but the degree of the oil combustion would increase with the increasing of the oil saturation.The water content of crude oil had an effect on the ignition temperature,the oil’s highest temperature and the degree of combustion of the crude oil.The ignition temperature and the highest combustion temperature would lower with the declining water content of crude oil,but in contrast,the burning degree would increase.The result showed that self-propagating chemical ignition could ignite the crude oil safely and reliably and carry out thermal flooding.
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Keywords:
- in-situ combustion /
- self-propagating /
- igniter /
- ammonium nitrate /
- citric acid /
- chemical ignition /
- physical simulation
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