LS生物酶井组驱油技术应用

APPLICATION OF OIL DISPLACEMENT BY LS BIOLOGICAL ENZYME IN WELL GROUPS

为了确定某油田区块进行LS生物酶驱油的可行性，用该油田油砂装填岩心进行物理模拟驱油实验，实验结果表明LS生物酶驱油剂的最佳使用浓度为4%，最佳段塞大小为0.2 PV，能够使原油采收率在水驱至极限含水的基础上再提高6%以上，具有较好的提高采收率效果。在该油田某井组的现场试验结果表明，注入LS生物酶驱油剂后，产液量基本保持稳定，产油量明显增加，含水率明显降低。达到产量高峰后日增油12.5 t，含水率降低12.9%，原油黏度由180 mPa·s降低至95 mPa·s，凝固点由28 ℃降低至23 ℃，油品性质得到了明显的改善。同时，LS生物酶驱油剂的注入对注水井起到了一定的解堵作用，注水井油压由8.75 MPa降低至7.60 MPa，吸水能力大大增强。措施后的6个月累计增产原油1 708.2 t，投入产出比1∶10.5。

In order to determine oil displacement feasibility by LS biological enzyme in an oilfield block, oil displacement experiment of physical simulation is conducted by the core made of the oil sands from the oil field. The result shows that the optimally used concentration of this kind of enzyme is 4% , the best slug size is 0.2PV, thus recovery factor can be enhanced by more than 6% again on the basis of the ultimate water cut of water flooding-in a word, oil recovery results are better. The field test conducted in a well group of the oil field proves that liquid production generally remains stabilized, oil production increases obviously, and at the same time water cut decrea- ses a great deal after injecting the agent. At the peak of oil production, incremental oil is 12.5t/d, water cut drops 12.9% , oil viscosity reduces from 180mPa · s to 95mPa · s, condensate point drops from 28℃ to 23℃, and oil quality improves greatly. Meantime, the injection of this kind of enzyme has played a certain role in removing block in injectors： tubing pressure of injectors slows down from 8.75MPa to 7.60MPa and furthermore water absorption capacity enhances a great deal. The accumulative oil production after 6-month stimulation reaches 1708.2t; inputoutput ratio is up to 1： 10.5.