SPE-182986-MS First MLTBS Level 5 Installation for Operator in Abu Dhabi Mohamed Ibrahim Elsayed, Abdallah Abdulhalim, Ali Mohamed Al-Mutairi, Talha Saqib, Abdul Moez Sabri, and Saud Mohamed Karrani, ADMA-OPCO; Calvin Ponton, Eulalio Rosas, and Rami Samir ElSin, Halliburton Copyright 2016, Society of Petroleum Engineers This paper was prepared for presentation at the Abu Dhabi International Petroleum Exhibition & Conference held in Abu Dhabi, UAE, 7-10 November 2016. This paper was prepared for presentation at the Abu Dhabi International Petroleum Exhibition and Conference held in Abu Dhabi, UAE, 7–10 November 2016. This paper was selected for presentation by an SPE program committee following review of information contained in an abstract submitted by the author(s). Contents of the paper have not been reviewed by the Society of Petroleum Engineers and are subject to correction by the author(s). The material does not necessarily reflect any position of the Society of Petroleum Engineers, its officers, or members. Electronic reproduction, distribution, or storage of any part of this paper without the written consent of the Society of Petroleum Engineers is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of SPE copyright. Abstract A major Abu Dhabi oil and gas producer targeted an increase in production from their major offshore oilfields. Better optimization of the reservoir through advanced well architecture was considered an option. One way to achieve this objective was through accessibility and hydraulic control of all horizontal drains. Multilateral technology is commonly used to increase the production per well and reduce drilling time while optimizing production facilities. The project targeted multiple reservoirs with two separate laterals to meet reservoir requirements. The application required individual through tubing access for intervention into each lateral. Multilateral technology has been traditionally limited to commingled production with limited or no access to the laterals. To help address and overcome these challenges, the operator planned and installed their first Level 5 multilateral tieback system (MLTBS). Well Selection Criteria The operator normally runs standard dual completions, however, with time production rates decrease and reservoirs require stimulation to bring production rates back in line with production targets. The standard dual completion that has been run historically by the operator only provides such accessibility for stimulation for the lower zone potentially shutting in the upper zone a short period after completion. As such, the operator selected one of these planned dual completions as a candidate for MLTBS primarily to accomplish three objectives as follows: • Get independent accessibility to both drains for dedicated stimulation • Allow for independent monitoring and logging of production profiles • Identify contributing zones (i.e., gas source) The well was selected in tight formation with natural fractures at the top of the reservoir. The selected reservoir is cretaceous reservoir forming a gentle anticline. The reservoir is faulted and fractured and capable of good production. The well was selected for MLTBS Level 5 completion to isolate the top fractured part and to produce from the matrix rather than fractures. Average porosity is 15% and average matrix permeability is between 2 to 5 millidarcies