双层完井技术提高底水油藏开发效果

双层完井的目的是在同一口油井进行油水同时分采,从而有效抑制底水锥进,加速底水油藏开发。该技术在油、水区分开完井,中间用封隔器隔开,油水界面以上的原油从环空中采出,油水界面以下的水从油管中采出。通过合理优化上、下完井段的排液量,可以提高底水油藏的开发速度和最终采收率。对该技术的技术原理、完井关键参数设计、理论和实验研究方法以及油田应用效果进行了详细的论述。油田应用效果表明,该技术既可用于新井的高效开发,也可使完全水淹报废井恢复生产。如果参数控制合理,采出的油可直接输入到油罐中,采出的水可直接排放或简单处理后回注地层,具有很好的经济效益和环保优势。

Application of dual completion technology to improve development effect of bottom-water reservoir

Dual completion technology means producing oil and water in the same oil well, with the aim to eliminate bottom water coning and accelerate the process of developing bottom-water reservoir. This paper thoroughly discusses the principle, critical parameters design, theoretical and experimental research methods, and field application results of the dual completion technology. Two sets of production system are installed in oil zone and water zone separately and separated by a conventional packer, with the oil flowing to surface through tubing/casing annulus and the water flowing to surface through tubes. Oil production rate and ultimate recovery will be improved remarkably if the two different completion zones are optimized and controlled reasonably. The dual completion technology has been applied in oil field, showing that it can not only be used for effective development of new wells but is also capable of restoring abandoned wells caused by water flooding. If operation parameters are controlled effectively, produced water-free oil can be piped to oil tanks directly and oil-free water can be discharged directly or re-injected into formation after simple processing, which brings good economic results and is beneficial to environmental protection.