水平井分段酸化效果影响因素分析及优化

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。 

Analysis and Optimization of Influential Factors on Horizontal Well Staged Acidizing

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 acid...