火烧油层物理模拟的研究

PHYSICAL MODELLING OF IN-SITU COMBUSTION

火烧油层法有与蒸汽热来法不同的机理和特点，它作为常规稠油、超稠油开采方法的补充，目前在国内外油田现场正不断得到应用，相应的实验室技术——火烧物理模型及其应用研究也不断加强。除介绍了火烧油层法的机理和特点外，主要介绍火烧物理模拟装置、火烧物理模拟相似准则及三大燃烧参数（燃料生成量，原油的自燃温度，通风强度）和其它物理模拟试验可得到的结果，如火烧经济指标（例如民油比和燃烧率）等。最后，以辽河科尔沁油田庙5块油样的试验为例，说明火烧物理模拟的应用。初步得到庙5块进行大驱的必要工艺设计参数，即原油的自燃温度约为420℃，当通风强度为4m2／（h·m2）时，其燃料生成量大于42．4kg／m3，占储量的百分比大于17％，说明该区块可以进行稳定燃烧，试验的采收率达到了60％。

In-situ combustion process involves a lot of different features and oil driving mechanisms from conventional steam oil recovery. As a supplementary means to conventional heavy crude and super-heavy crude thermal recovery at present, in-situ combustion has been applied in oil fields at home and abroad- Corresponding studies of laboratory techniques of in-situ combustion physical modelling and its applied researches have been enhanced continuously. Besides introducing mechanism and some features of in-situ combustion, combustion test equipment and its analogy criteria for simulation, three combustion parameters (fuel forming amount, air flux, spontaneous ignition temperature of crude) and other results to be available such as economic indexes (air/oil and air consuming ratio) for physical modelling are all introduced in this paper. Finally, for showing the application of the combustion modelling, a simulated combustion test with oil samples from Miao 5 block of the Horqin oil field in Liaohe oil complexis given. Some requisite technical parameters for combustion process to be designed in field performance for this block are obtained. For an example, oil spontaneous ignition temperature is about 420℃ for Miao 5 block, the air flux is 4m3/(h· m2), the fuel forming amount is over 42. 4kg/m' and the ratio of coke amount to OOIP is over 17%. It is exDected that stabilized combustion can be established in Miao 5 block. A recovery factor of 60% is obtained in this modelling test.