公开(公告)号：US06501072B2

公开(公告)日：2002-12-31

申请号：US09772209

申请日：2001-01-29

申请人： Oliver C. Mullins ,  Abul Jamaluddin ,  Nikhil B. Joshi

发明人： Oliver C. Mullins ,  Abul Jamaluddin ,  Nikhil B. Joshi

IPC分类号： G01N1502

CPC分类号： E21B47/102

摘要： The optical density of an oil sample at a plurality of wavelengths over a plurality of different (typically decreasing) pressures is monitored and used to find the size of agglomerated asphaltene particles which are precipitating from the oil sample. The optical density information used in finding the particle size is preferably optical density information relating to the scattering of light due to the asphaltene particles only. Thus, baseline optical density information of the oil sample at a high pressure is subtracted from optical density information obtained at test pressures at each wavelength of interest. Asphaltene particles of a radius of one micron and smaller were found to be powdery, while asphaltene particles of a radius of three microns and larger were found to include paving resins. The precipitation of asphaltenes is reversible by increasing the pressure under certain circumstances.

摘要翻译： 监测多个不同（通常减小的）压力下的多个波长的油样品的光密度，并用于找到从油样中析出的附聚沥青质颗粒的尺寸。 用于发现粒度的光密度信息优选仅与由于沥青质颗粒引起的光的散射有关的光密度信息。 因此，从感兴趣的每个波长处的测试压力下获得的光密度信息中减去高压油样的基线光密度信息。 发现半径为1微米以下的沥青质颗粒为粉状，发现半径为3微米以上的沥青质颗粒包括铺路树脂。 在某些情况下，通过增加压力可以降低沥青质的沉淀。