Evaluation of damage to horizontal wells through equivalent horizontal well length

摘要: Abstract The skin factor and additional pressure drop which are used to evaluate the formation damage of vertical wells can not accurately be applied horizontal wells. A new model for evaluating is presented. This method derived by utilizing modifying concept equivalent well length presented Malekzadeh, where permeability anisotropy considered a calculation productivity ratio proposed. results show that damaged well, shorter than completed interval, while stimulated longer interval. fact is, smaller indicates more advanced in oilfield development. subjected loss when it productive after stimulation. application Bohai Oilfield directly efficiently determine magnitude around its impaction on productivity. It also sheds light reservoir development evaluation standard.