复杂碳酸盐岩油藏低产低效井综合治理对策研究—以伊拉克米桑Asmari油藏为例

Research on the Comprehensive Handling Measures for Low Yield and Low Efficiency Wells in Complicated Carbonate Reservoir—Taking Asmari Reservoir in Missan, Iraq as Example

摘要: 本文针对复杂碳酸盐岩油藏低产低效井的特点，系统分析了低产低效井出现的主要原因，并提出针对性的治理措施。研究表明，影响低产低效井的三大类主要因素分别为地质因素、开发因素以及工程因素，并进一步细分为七类次级因素：储层薄、强非均质、含水上升快、出砂、合采、作业污染和井筒问题等，针对低产低效原因的复杂性，本文提出了“一井一策”的治理模式，具体包括酸化、解决各类井筒问题、技术改层、下泵+放油嘴及开发层系优化等。研究成果应用效果良好。该研究对相似油田的低产低效井治理有着借鉴意义。

Abstract: The main reasons for low yield and low efficiency wells were systematically analyzed according to the characteristics of low yield and low efficiency wells (LYLEWs) in complex carbonate reservoirs. And the corresponding measures were put forward to solve the problem. Research results show that the 3 main influential factors which lead to LYLEWs are geological factors, development factors and engineering factor by research, which can be further subdivided into 7 secondary factors including thin reservoir, strong heterogeneity, water cut rising rapidly, sanding out, very long intervals of commingle production, contamination by job and wellbore problem and so on. In order to solve the above problems, “One Well One Measure” was proposed, which including acidification, borehole integrity assurance, plugging highly water cut zone and adding perforations, running pump or enlarging choke and development layer series optimization and so on. The research results were applied in Asmari formation of X oilfield and good effect was got. The study was useful for referential value of similar oilfields in the aspect of LYLEWs management.