TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper describes an innovative Down Hole Permanent Monitoring System (PDHMS) that allows real-time monitoring of bottom-hole pressure and temperature of two stacked reservoirs using one vertical observation well in a Saudi Aramco field.Permanent monitoring of pressure and temperature enables reservoir engineers to assess the performance of the reservoir in areas such as flood front movement and pressure support maintenance. In this well a multi-reservoir dual gauge system was deployed to monitor pressure and temperature in two stacked carbonate reservoirs.The standard dual-gauge system mandrel architecture requires below packer installation of the gauges which in turn increases the risk of leakage in the electric lines of the system. In this paper, we describe an innovative and potentially reliable digital permanent monitoring solution that uses the state-of-the-art welded system that aims to eliminate the risk of leakage.Included in the paper are the design criteria, deployment methodology and the "lessons learned" from installation of this fully welded PDHMS.

The use of Inflow Control Device (ICD) in long horizontal wells drilled in naturally fractured carbonate reservoirs (NFR) has helped alleviate premature water breakthrough and control high water production. The main factors associated to premature water breakthrough and high water cut in NFR wells are the uncertainty in fracture conductivities and location of fracture corridors crossing or nearby to the horizontal wellbore.In this paper, an assessment is provided of the production performance review conducted over a limited NFR area developed with some horizontal wells equipped with ICD completions versus other horizontal barefoot open-hole completions. Efforts have been made to compare the horizontal wells in same reservoir areas and layers of comparable reservoir quality and all wells used in this study had complete fluid losses during drilling. Data used in the evaluation included production and pressure data, image and caliper log, production log profile, fracture maps, open hole log and ICD completion design.Six horizontal wells equipped with ICDs are currently producing within expected oil production rates at low water cut. Two of these six wells with ICD's are observed to have water breakthrough delay of up to 18 months compared with offset barefoot open hole horizontal wells. These ICD wells have been on production for more than three years. On the other hand, three horizontal open-hole wells of similar characteristics are either dead or producing at a high water cut. This paper will shed light on lessons learned including in three horizontal wells equipped with ICDs that are experiencing high water cut. After reviewing all available well/reservoir/production data for the studied horizontal wells, some improvements have been recommended for both the ICD design approach and how wells equipped with ICD in NFR should be produced.? Geological Field BackgroundThe Super giant field is a North East trending anticlinal structure that is roughly symmetric from west to east. This carbonate formation is divided into many stratigraphic zones: Zone-1, at the top, is a thin layer with limited porosity and low permeability and separated from the main producing zones by an impermeable non-porous layer of anhydrite. Zone-2A and Zone-2B, just below Zone-1, are the major

The paper covers a story of field that was brought on production using a combination of industry leading edge technologies; maximum reservoir contact (MRC) multi-lateral wells; advanced well completions and intelligent field infrastructure. Though individual components of the technologies had been tested and proven but the combination of these technologies in one development made this field to stand out as among the firsts in the industry. This feat came with peculiar challenges and rewarding opportunities.This article undertakes an assessment of the field, the wells and the technologies; following five years of production. The article discusses a unique case study detailing real time field and wells performance monitoring, management and production optimization. The experience from this field has provided unique knowledge and insight to better understand how the advantage of these technologies were nurtured and leveraged to take performance to the next level. During the five years of production, this field has been meeting or exceeding the fundamental field Key Performance Indices (KPIs) such as production targets, sweep efficiency and well potential. Moreover, the intelligent field infrastructural environment has made possible proactive real-time reservoir management leading to more efficient operations and result-oriented business work flows.

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