降压增注酸化工艺在濮城南区沙二下油藏中的应用

濮城油田南区沙二下油藏是具有多油层开发的油藏，纵向上发育8个砂层组，37个含油小层。油藏储层在物性上表现为较强的非均质性，胶结物粘土含量高，易膨胀。长期的注水开发使注水井油层近井地带受到堵塞、结垢、污染等伤害，严重制约油田的高效开发。针对存在的问题，运用降压增注工艺技术，通过在井网注采关系完善区，选择在生产过程中由于污染、结垢、堵塞造成注水量下降或注水压力上升的水井，整体实施降压增效，收到良好的效果。该工艺不仅能达到较好的降压、增注目的，而且有效期长，是改善非均质油层注水开发油田状况的主要措施之一。

Application of Low Damage and Low Speed Deep Seated Acidification in the Lower Es2 Reservoir in the North of Pucheng Oilfield

The lower E 2 s reservoir in the north of Pucheng Oilfield is a set of multi layer reservoir,which develops 8 sets of sandstone formation,37 oil bearing layers in longitudinal,which represent strong heterogeneity of property,high content of clay of cement result in expansion.The long period water injection development result near wellbore zone blocking,fouling and contamination,which restrict the development of oilfield severely.A kind of low damage and low speed deep seated acidification technology used in selected water wells,in which injected water falling or injected pressure boost in the production area of well pattern and injection production system,was carried out and receive well effect.This technology can attain a longer available period of depressurization and increasing injection,which is one of the major measure to improve the status of the heterogeneous oil bearing injection development oilfield.