Ultra-long horizontal wells are widely used in low-permeability reservoirs of NEB oilfield in ABU Dhabi, the acid distribution effect in lateral section is a key factor restricting the well performance of ultra-long horizontal wells after acidi-zing. LEL ( Limited Entry Liner) completion and acidification is an effective method to achieve uniform acidification of ultra-long horizontal wells. However, the commonly used LEL design methods mostly rely on special simulation tools, which are not convenient for parameter sensitivity analysis and fast design optimization. Based on the optimal selection of friction calculation models for pipe flow and orifice flow, analytical expressions for designing the hole number distribution of LEL are derived, which can be used to design the hole number distribution rapidly in ultra-long horizontal wells with LEL completion. Besides, the prediction and evaluation of acidizing effect were carried out based on the calculation models of wormhole length and equivalent skin coefficient. Taking the actual drilling condition of a well in NEB oilfield, ABU Dhabi as an example, the hole distribution design and acidification effect prediction of LEL were carried out. The results show that the wormhole length for LEL acidized wells can reach 1.32-1.63 m and the equivalent skin factor can reach - 2. 85 ~ - 3. 06. The PV to breakthrough is a key parameter for LEL design, which should be measured experimentally. Uniform acid coverage should not be the only goal of LEL design, reservoir heterogeneity should be taken into account, wormhole length, equivalent skin factor as well as uniform production profile are better to be taken as the goals of hole distribution design.