特低孔低渗裂缝性油藏酸化改造效果分析

ANALYSIS OF THE ACID STIMULATION EFFECT FOR EXTRA-LOW PERMEABILITY,POROUS FRACTURED RESERVOIR

公山庙油田位于四川盆地中北部,于1990年投入试采,区域构造属于川中古隆中斜平缓构造区营山构造群的中部,属特低孔低渗、孔隙裂缝性多产层开采的复杂油田。油藏储层非均质性强,油气富集主要受高能滩相灰岩与裂缝的双重控制,宏观裂缝或微裂缝是获得产能的必要条件。因油田为消耗式开采,年自然递减率高达16%左右,采用增产工艺措施改造储层是油田稳定生产、延缓递减的重要途径。针对近年来酸化增产工艺措施井的生产效果进行了综合分析,对影响措施效果的因素进行了较深入的研究,为下步油田的储层改造、维持油田稳产具有重要的指导意义。实践证明,油田实施的酸化改造措施能有效改善近井地带的渗流条件和沟通较远地带裂缝,形成有效的油流通道,这对于其他同类油田具有一定的借鉴意义。

Gongshan Field locates in Middle North of Sichuan Basin,it belongs to extra-low permeability,porous fractured reservoir,oil and gas enriched zone is controlled by high energy facies limestone and fracture.The fracture is essential to get productivity.For the field adopts expendable production and annual natural decline rate is high up to 16%,acid stimulation is very important measure to make production stability.The paper analyzed the effect of acid stimulation and studied the factors that affected the acid stimulation effect.The research result has very important guidance significance for the reservoir renovation and sustained production in the future.