水平井分段酸化效果影响因素分析及优化  

Analysis and Optimization of Influential Factors on Horizontal Well Staged Acidizing

作　　者：曲占庆[1] 于姣姣[1] 温庆志[1] 贾宗文[1,2] 田相雷[3] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266555 [2]中海油研究总院,北京100027 [3]中国石化胜利油田分公司现河采油厂,山东东营257061

出　　处：《石油钻探技术》2011年第6期63-68,共6页Petroleum Drilling Techniques

摘　　要：水平井井段在钻井过程中受到污染,会对油井产能造成影响,而水平井分段酸化技术是解除近井地带污染的一种非常有效的措施。基于实际水平井水平段污染特征和污染带的分布规律,建立了水平段污染带模型、酸液用量模型和酸化后效果预测模型,详细分析了地层矿物的质量分数、酸液浓度以及井段分段段数对酸化效果的影响,并在一定条件下对最佳酸液浓度选取方案以及分段段数进行了优化设计。结果表明:所用酸液浓度需根据地层状况确定;分段酸化可以很好地解除水平井近井地带的污染,但要根据现场的实际情况优选最佳的分段段数。对某口井进行了分段酸化优化设计并进行了施工,酸化后地层有效渗透率达到31.0×10-3μm2,孔隙度为30.9%,增产倍比为2,说明分段酸化方法适用于现场实际。Formation damage in horizontal well drilling will affect well deliverability.Staged acidizing is an efficient method to remove the near wellbore damage.On the basis of damage model,acid fluid volume calculation and the prediction model of acidizing treatment combined with the real damage feature,the effects of mineral content,acid concentration and the volume of acid fluid on treatment are analyzed.The result shows that acid concentration should be determined according to the reservoir condition.Staged acidizing can remove formation damage near wellbore region.The production is doubled when the design is applied in field.The permeability and porosity is 31×10-3 μm2 and 30.9% respectively after acidizing.It shows that this method can be used in field.

关 键 词：水平井 分段酸化 矿物质量分数 酸液浓度 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]