Fast track development projects, with timely data acquisition plans for development optimization, are very challenging for tight and heterogeneous carbonate reservoirs. This paper presents the challenges and key learning from initial stages of reservoir development with limited available data. Focus of this study is several stacked carbonate reservoirs in a giant field located in onshore Abu Dhabi. These undeveloped lower cretaceous reservoirs consist of porous sediments inter-bedded with dense layers deposited in a near shore lagoonal environment. The average permeability of these reservoirs is in the range of 0.5-5 md. Mapping the static properties of these reservoirs is difficult since they are not resolved on seismic due to the low acoustic impedance contrast with adjacent dense layers. Petrophysical evaluation of thin porous bodies inter-bedded with dense layers in highly deviated wells pose significant challenges. Laterolog type LWD resistivity measurements which are less affected by environmental effects, offer more accurate formation resistivity compared to propagation type measurements. With limited suite of logs, some of the zones with complex lithology had to be evaluated innovatively as detailed in the paper. Integrated studies are initiated to improve reservoir description by carrying out accurate permeability mapping, SCAL, geomechanical and diagenesis & rock typing studies. Significant challenges exist regarding the development of thin, tight and highly heterogeneous reservoirs, in terms of recovery mechanism, well architecture, well count, drilling, well completion and economics. Static and dynamic models were used extensively to evaluate different development scenarios and conduct sensitivity studies to bracket uncertainties. Various geo-steering options were discussed and the paper also details maximizing the reservoir productivity using long reach MRC (Maximum Reservoir Contact) wells. Tight and heterogeneous reservoirs call for extensive and real time reservoir surveillance activities to assess well performance and reservoir connectivity. This paper highlights how these challenges are overcome through upfront surveillance planning and proactive well completion strategy.

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This paper describes a case history detailing design, planning, completions, testing and production of first Inflow Control Device (ICD) horizontal well in one of field in Middle East. In this field, most of existing wells are openhole horizontal producers. A non uniform production profile across the horizontal section can result in early water and gas breakthrough. This can substantially reduce oil production, create zones of bypassed oil and lower the ultimate recovery. In case of early water breakthrough, it will also accelerate the need for artificial lift for individual wells and require increased water and gas handling capacity requirements. The area of first row of producers located close to the water injectors are now experiencing increasing water cut in some wells causing the well to decline and die prematurely. Objective from the first ICD installation was to test the technical concept of ICD completion in managing the heel-toe effect and reduce the water cut (multiple water entries) in this well, as a first step to mitigate the down-dip and mid-dip problem. Additionally following objectives were set: reduce water cut, optimize production, extend the life of well, prove ICD technology benefits and use to field wide. A critical aspect of the process way the modeling, prediction and optimization of both reservoir performance and completion hardware design. After successful ICD design and installation, well was put on production and tested, following results are achieved: oil rate increased by 100%, Water cut reduced by 18% and well head pressure increased by 30%. The appraisal and acceptance loop of the completion has been closed by having this well completed, put on production and tested. Approval of concept was achieved and the anticipated benefits were realized by actual performance of the well. Leverage knowledge from this pilot well has provided an insight into ICD capabilities and implementation and has set the stage for other fields.