高磨地区灯影组室内酸化效果评价方法探讨

Discussion on laboratory evaluation methods in acidizing to Dengying Fm, Gao-Mo block

关键词:  高磨地区  长岩心  酸化效果  转向酸  胶凝酸 

Key words:  Gao-Mo block  long core  acidizing effect  diverting acid  gelling acid

摘要:

针对高磨地区震旦系灯影组裂缝-孔洞型为主的储层特征,常规的短岩心酸化效果主要模拟解除储层的表皮伤害,而对于储层的深度酸化模拟无法满足需求。为了更好地指导酸液的选择,从长岩心处理、流体选择、实验参数选择等方面进行研究,探讨了针对高磨地区灯影组的长岩心酸化效果评价方法,并通过对比转向酸与胶凝酸酸化效果室内实验,明确了转向酸对低渗储层无法突破长岩心,对高渗储层酸化效果显著,渗透率提高了12.1倍；胶凝酸对低渗储层与高渗储层酸化效果均显著,渗透率分别提高5.6倍与20倍。现场应用4井次,其改造效果与室内评价结果相吻合,从而说明长岩心酸化效果评价方法对高磨地区灯影组储层酸液的选择具有一定的指导作用。

Abstract:

For the major reservoir characteristics of fracture-cavity in the Sinian Dengying Fm, Gao-Mo block, conventional acidizing effect with short cores which simulates the elimination of reservoir skin damage is hard to meet the requirement of deeply acidizing simulation. For a better guidance to choice acidizing fluid, this paper discusses laboratory evaluation methods of acidizing with long core in Dengying Fm, Gao-Mo block, which includes long core treatment, choice of liquid and choice of experimental parameters. By contrast of laboratory acidizing effect on diverting acid and gelling acid, a conclusion is drawn that diverting acid can’t pass through long core, and is effective for high permeability reservoir with increase of permeability by 12.1 times, while gelled acid has good effects on both low and high permeability reservoirs with increase of permeability respectively by 5.6 and 20.0 times. The field application shows that the field effects are consistent with laboratory evaluation, which means evaluation methods of acidizing with long core plays a guidance role in acid fluid choices of Dengying Fm, Gao-Mo block.