酸压井酸蚀蚓孔区对产能的影响

Effect of acid-wormholing zone on deliverability of acid fracturing wells

陈冀嵋 文浩 徐乐 杜岚 蒋宜春

CHEN Jimei WEN Hao XU Le DU Lan JING Yichun

西南石油大学，四川成都　610500 华北油田公司，河北任丘　062552 辽河油田公司，辽宁盘锦　124010

Southwest Petroleum University,Chengdu 610500, China Huabei Oilfield Co.,Renqiu 062552 China

针对酸压后蚓孔区影响油井产能问题，将酸压井的酸蚀蚓孔区考虑为双重介质系统，导出酸压井蚓孔区渗流模型。将蚓孔区双重介质渗流数学模型结合裂缝流动模型、地层线性流模型以及地层拟径向流模型求得各流动阶段井底压力解，从而建立了考虑蚓孔影响的酸压井产能公式。对各个渗流阶段无因次时间与无因次导流能力的分析结果表明，蚓孔区对低渗透油藏的酸压产能影响明显。研究结果为合理预测酸压井产能提供了一条可行途径。

The wormhole zone is considered as a dual-media system and a model is proposed by considering the effect of the wormhole. The bottomhole pressure can be solved by combining the mathematical model of flow through dual media with the fracture flow model, the linear flow in formation and the pseudo radial flow model. So a deliverability equation of acid fracturing wells considering the effect of wormhole is established. The dimensionless time and dimensionless flow conductivity of different flow stages are analyzed. The results show that the wormhole zone exerts great impact on the acid-fracturing deliverability of low-permeability reservoir.