L1油藏微球+表面活性剂驱油技术研究与应用

Research and application of microspheres and surfactant flooding technology in L1 reservoir

随着注水开发时间延长,姬塬油田超低渗透L1C8油藏面临平面和剖面水驱矛盾突出、油井见水等问题,通过逐轮次实施调剖调驱后,储层物性较好的高渗带优先逐步开采,物性较差的低渗带储层越难挖掘。因此急需探索通过PEG或聚合物微球堵优势水驱通道,扩大波及体积;再利用表面活性剂通过降低界面张力、改变岩石润湿性,改善驱油效率技术思路,实现“堵+驱”改善水驱、提高驱油效率技术。本文采用微球+表面活性剂先堵后驱技术思路,研发了一种AES乳化表面活性剂,通过开展室内评价和14个井组现场应用,取得了较好的驱油及降递减效果,有效的缓解了油藏水驱矛盾,实现区块剩余油的有效开采。

With the extension of development time of water injection,the ultra-low permeability L1C8 reservoir in Jiyuan oilfield is faced with some problems such as obvious contradiction between plane and profile of water flooding and water breakthrough in producing wells.After polymer microsphere flooding and PEG profile control round by round,the reservoir of the high permeability zone with good physical properties is prioritized and gradually developed,while the reservoir of the low permeability zone with poor physical property is more difficult to excavate.Therefore,it is urgent to explore the blocking of the dominant water flooding channel by PEG or polymer microspheres to expand the sweeping volume.Reusing surfactants can improve oil displacement efficiency by reducing interfacial tension,changing rock wettability,and achieving the technology of"blocking+flooding"to improve water flooding and improve the flooding efficiency.In this paper,using the idea of polymer microsphere+surfactant first blocking and then flooding technology,an AES emulsification surfactant was developed.Through experimental evaluation and the application of 14 well groups,good oil flooding performance and decrement effect have been achieved.It effectively alleviates the contradiction of water flooding in the reservoir and realizes the effective exploitation of the residual oil in the block.