高胶质原油冷指沉积实验研究  

Experimental Study on Cold Finger Deposition of High Colloid Crude Oil

作　　者：张伟森 付云 尹洪超 来建宾 段林林 向凤仙 陈韵 张义 ZHANG Wei-sen;FU Yun;YIN Hong-chao;LAIJian-bin;DUAN Lin-lin;XIANG Feng-xian;CHEN Yun;ZHANG Yi(CNOOC Experimental Center,CNOOC Ener Tech-Drilling&Production Co.,Tianjin 300452,China)

机构地区：[1]中海油能源发展工程技术分公司中海油实验中心,天津300452

出　　处：《当代化工》2022年第12期2810-2813,共4页Contemporary Chemical Industry

基　　金：国家自然科学基金(项目编号:51974088)。

摘　　要：渤海某油田存在普遍的井筒沉积堵管现象,清管周期长且效果不理想。进行除蜡作业时发现,油品输送温度高于析蜡点仍产生沉积且不同产量下的井筒沉积情况不同。为探究产量不同时井筒沿线的沉积物变化规律,开展室内蜡沉积冷指实验。结果表明:当井筒壁温在析蜡点以下时,随着油壁温差增大,沉积速率和沉积厚度增大;当井筒壁温接近析蜡点时,造成沉积的主要因素是胶凝淤积,故仍需对析蜡点以上的温度进行清管作业;产量的波动会导致油温发生变化,随着产量的减小,同一壁面温度出现的位置越靠近井底,清蜡的深度也随之增大。There is a widespread phenomenon of pipe plugging because of wellbore sedimentation in an oilfield in Bohai Sea. The pigging cycle is long and the effect is not ideal. During the dewaxing operation, it was found that deposition still occurred when the oil transportation temperature was higher than the wax precipitation point, and the wellbore deposition conditions were different under different production rates. In order to explore the changing law of sediments along the wellbore at different production rates, a cold finger experiment of indoor wax deposition was carried out. The results showed that when the wellbore wall temperature was below the waxing point, the deposition rate and thickness increased as the oil wall temperature difference increased. When the wellbore wall temperature was close to the waxing point, the main factor causing the deposition was gelling and siltation. Therefore, it was still necessary to carry out pigging operations at the temperature above the wax precipitation point. Fluctuations in production will cause the change in oil temperature. With the decrease of production, the closer the temperature of the same wall appears to the bottom of the well, the depth of wax removal will also increase.

关 键 词：井筒 析蜡点 沉积速率 沉积厚度 冷指实验 

分 类 号：TE358.2[石油与天然气工程—油气田开发工程]