油井高回压影响因素的敏感性分析

Sensitivity Analysis on Influencing Factors of Oil Well High Back Pressure

油井产出液中高含水,使产出液的流动性得以提高,对于地面低温集输了提供有利条件。但低温集输工艺易导致多数油井出现回压上升的现象,现采用系统单因素敏感性分析方法,结合Beggs-Brill压降计算方法,对日产液量、含水率、井口出油温度、集油距离和管道内径五个因素进行敏感性分析,并结合现场测试数据,提出治理措施。研究表明:管道内径和井口出油温度对井口回压的影响最敏感,其次为含水率,日产液量和集油距离最不敏感。因此为防止因井口回压高而影响油田的正常生产,可以通过辅助掺热水流程来提高井口出油温度,降低井口回压,提高生产效率。

The high water cut in the produced fluid of oil well can improve the fluidity, and creates a good prerequisite for implementing low-temperature gathering and transportation. However, low-temperature gathering and transportation process can easily lead to back pressure rise in the most of oil wells. By using the single factor sensitivity analysis method, the sensitivity analysis on the liquid production, the water cut, the oil temperature, the oil gathering distance and the pipe diameter was carried out with the Beggs-Brill model calculation method. And combined with the field test data, the control measures were proposed. The results showed that: the pipe diameter and the oil temperature were the most sensitive factor, followed by the water cut, the liquid production and the oil gathering distance were the least sensitive factor. Therefore, in order to prevent the high back pressure from affecting the normal production of the oil field, the oil temperature should be increased to reduce back pressure and improve production efficiency by assisting the hot-water mixing process.