生产参数对沥青质井筒析出影响规律研究

Influence of Production Parameters on Asphaltene Precipitation Regularity in Wellbore

吴川 张汝生 张祖国 佘跃惠 吴正彬

WUChuan ZHANGRusheng ZHANGZuguo SHEYuehui WUZhengbin

中国石化石油勘探开发研究院, 北京 海淀 100083 长江大学化学与环境工程学院, 湖北 荆州 434023 中国石油大学(北京)石油工程学院, 北京 昌平 102249

Petroleum Exploration and Production Research Institute, SINOPEC, Haidian, Beijing 100083, China College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, Hubei 434023, China College of Petroleum Engineering, China University of Petmleum(Beijing), Changping, Beijing 102249, China

针对油田沥青质井筒沉积问题，开展了生产参数对沥青质井筒析出影响规律研究，研究中采用了压差法，高温高压条件下测定温度、油气比、流速等对沥青质析出压力与再溶解的临界压力的变化规律。研究结果表明，沥青质析出压力（）与温度成反比，而沥青质再溶解的临界压力（）与温度成正比；温度一定，沥青质析出压力（）随着油气比增大而增大，即原油中溶解气体量大，沥青质沉积的趋势增大；油气比和温度一定时，流速变化对沥青质的析出压力和再溶解压力几乎没有影响。

This study investigated the influence of production parameters on asphaltene precipitation regularity under the conditions of high temperature and high pressure and evaluated the influence of temperature, GOR (gas-oil ratio), and flow velocity on asphaltene precipitation in wellbores. The results showed that the pressure of asphaltene precipitation () was inverse to temperature and the pressure of asphaltene redissolving () was proportionate to temperature. was proportionate to the GOR at a certain temperature because the dissolved gases in the oil increased when the GOR improved and may have caused asphaltene precipitation. and were not influenced by flow velocity in certain GOR and temperature ranges. This study demonstrated how asphaltene precipitation regularity can be controlled to decrease the risk of asphaltene precipitation in wellbores.

10.11885/j.issn.1674-5086.2015.05.19.04