生产参数对油井沥青质沉积特征的影响

Effects of Production Parameters on Asphaltene Deposition Characteristics in Oil Wells

油井生产过程地层能量衰减、溶解气析出将会改变沥青质的沉积特征,明晰油井生产工况变化对沥青质沉积的影响有利于维持原油高效稳定生产。本研究以顺北A油井为研究对象,通过薄层色谱法测试了原油组分,并采用高温高压固相沉积规律测试装置模拟了不同工况对沥青质沉积的影响。结果表明:原油胶体不稳定指数CII随生产周期的延长而增大;气油比减小会促使沥青质在井口沉积,而油藏压力衰减会促使沥青质向地层沉积。

Oil reservoir energy decay and dissolved gas release will change the deposition characteristics of asphaltene during oil well production.Understanding the influence of oil well production conditions on asphaltene deposition was conducive to maintaining efficient and stable oil production.Taking Shunbei A well as the research object,the crude oil components were measured by TLC,and the effects of different conditions on asphaltene deposition were simulated by a high-temperature and high-pressure solid-phase deposition device.The results showed that CII index of crude oil increased with the production cycle,decreasing gas-oil ratio urges asphaltene deposition at the wellhead,while decreasing reservoir pressure caused asphaltene deposition into the reservoir.