This paper presents the extended reach well construction results to-date for the development drilling campaign in Yetagun gas field, offshore Myanmar which delivered top-quartile drilling performances throughout every phase of well delivery. The main technical hurdles contributed to the success of these wells were drilling practices, mud selection and directional control technique. Every phase of drilling, evaluating, and completing of high angle wells was analyzed by utilizing in-house expertise, published literature, drilling proposals and reports. Both the techniques and lessons learnt throughout the campaign were distributed with the aim that the information can be built upon, in order to further improve future extended reach well delivery. Value was generated through performance improvement. A few offset wells were commonly selected and analyzed in order to act as a benchmark for expected performance, but up-front effort needed to be established by proposing the significant key performance indicators (KPIs) which required specialized resources. Systematic approach to benchmarking drilling performance eventually led to many features and benefits. Statistical analysis of the KPIs covering the central tendencies and convergence link to the consideration of benchmarks. Historically, the ERD development wells in PETRONAS were taken in the region by setting the key performance indicators (KPIs) for DDPTF at 3.5 days/1000ft, WCPF at 2420 USD/ft and DCPF at 1680 USD/ft. Engineering team of the campaign had delivered all the KPIs in the top quartile category with zero LTI and successfully secured the reservoir target with the maximum drainage contacts while meeting the gas volume target. Every aspect of the well design and construction was discussed, challenged and where possible, optimized for further study. The dramatic outcomes of the drilling performance always resulted from the combination of small incremental improvements and stepchange innovations. In conclusion, the key differences in drilling practices throughout the campaign were proven to be practicable and in fact played an important role in contributing to the top-quartile well delivery performances. Since the ERD became an ever-more important enabling technique to exploit hydrocarbons nowadays, the replication of the practices and lessons learnt should be shared to the industry for future extensive wells delivery operations. © 2017, Society of Petroleum Engineers.