Abstract: Reservoirs in Iranian Yada Oilfield are well developed with several payzones, including two major ones, Sarvak and L.Fahliyan. The upper major reservoir, Sarvak, is featured by high corrosive gas and asphaltene content. The lower major reservoir, L.Fahliyan, is divided into upper and lower L.Fahliyan layers, with the characteristics of high temperature and pressure, high, corrosive gas content, and potential solid phase production and so on. The completion technology research has been conducted, aiming at dealing with the challenges in both Sarvak and L.Fahliyan. In consideration of the reservoir stability, pressure system and test data of drilled wells, completion methods are put forward: for Sarvak, open hole with slotted liner; For L.Fahliyan, open hole with slotted liner for L.Fahliyan Upper only, and cased hole with perforation for both L.Fahliyan Upper and L.Fahliyan Lower. The completion string and perforation plan are optimized. The successful field applications in 10 wells indicate successful completion jobs and good results based on the designed completion measures.