喇萨杏油田层系井网现状及调整对策

CURRENT WELL PATTERN AND ADJUSTMENT CONTERMEASURE TO LASAXING OILFIELD

喇萨杏油田具有储层多，砂体形态复杂，平面、纵向差异较大及非均质严重等特点，这决定了储层不可能在开发初期一次认识清楚，需要在水驱开发过程中逐步提高对储层的认识，并不断调整、改善油田的开发效果。喇萨杏油田的开发经历了基础井网、一次加密调整、二次加密调整、三次加密调整和主力油层聚合物驱油，目前已进入特高含水期开发阶段，基于喇萨杏油田萨中及以南地区多套水驱层系井网交叉的认识，提出对喇萨杏油田不同地区的油层实行“分类研究、分类挖潜”，即对不同类型油层分别采用聚合物驱开采、注采系统调整与三次加密相结合等新的开发技术对策，为油田后期进一步提高采收率、改善油田开发效果提供有效调整途径。

The development of Lasaxing Oilfields has experienced basic well pattern, first infilting, secondary infilling, third infilling and polymer flooding in the main oil layers, and now these fields have entered into extra-high watercut development stage. On the basis of the understandings of the many sets of cross linked water-flooded-series well patterns in Sazhong and its south of Lasaxing Oilfields, the new developing technique countermeasure is point- ed out, such as ＂ classified studies and adjustments＂ for the oil layers in the different regions, that is separately a- dopting polymer flooding, injection-production-system adjustment integrating with third infilling and so on for the different types of oil layers. All the studied achievements have provided effective adjusting methods for the further enhancing oil recovery and improving development effects at the late period of the oilfields.