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Full Field Development Plan “The Big Picture – Creating the Future From the Future & Success Through Real Synergy” Arshad Ali 20979959 SPE Number 120429 Presented at 2009 SPE Middle East Oil & Gas show conference Bahrain (15-18 March 2009)


Contents Field Overview A Big Picture Event Major Project Approval Process (MPAP) Over All Synergy What can go Wrong ? Risk & Uncertainty Economic Analysis Consequences of not embarking the Project Conclusions & Recommendations

Field Overview:

Field Overview ADCO (Abu Dhabi Company for Onshore Oil Operations) consists of three different reservoirs Field A Development becoming increasingly complex & expensive. Need to develop an efficient design & planning philosophy. Field A is giant heterogeneous carbonate field Elongated, F aul ted & Double Plugging Anticline Area of the field is 30 Km long & 10 Km wide, dip 3-5 o on the western & eastern side & 1-2 o on the northern & southern side. Three reservoirs X Y Z are found at the depth of about 8000 ft. Y is the most prolific reservoir & contains over 2/3 of the field OIP. API Gravity of about 40 o & GOR about 800 scf / stb . Y is an under saturated heterogeneous & highly stratified reservoir made up of five subzones – YI YII YIIIU YIIIL & YIV. Composition of oil properties of three reservoirs are similar because reservoirs are in communication through fault.




A BIG PICTURE EVENT Def. A Process that encourages a complete understanding of the asset & its components and conduct a detail review of alternatives, risks & uncertainties in determining the requirements for maximizing value. Obj. To Provide a clear direction on the surface of the subsurface & a recommendation for facilities development.



Event Stages & Schedule:

Event Stages & Schedule

The Boundary:

The Boundary For the core reservoir all possible options were considered & ranked for final option selection. For the non core reservoir fields the ultimate objective was to see the impact on field A.

Evaluation Process:

Evaluation Process

Evaluation Process:

Evaluation Process

What can go Wrong ?:

What can go Wrong ? Risk & Uncertainty

Risk & Uncertainty Registers:

Risk & Uncertainty Registers 43 items were identified & described in terms of risk intensity, probability of occurrence, urgency & manageability. No critical issue was identified, except an issue related to ability to handle incremental gas & H 2 S. Most significant risk identified are related to external constraints and the foreseeable increase in operation complexity. Risks were identified on the basis of their impact to Plateau rate Ultimate Recovery (UC) Capex , Opex & HSE.

What can go wrong ?:

What can go wrong ? Reservoir The main reservoirs risk is higher than expected water cut due to limited historical data on wet production from horizontal wells. Currently well ceased to flow around 50% water cuts due to lack of artificial lift. Residual oil saturation has also been identified as an uncertainty. Recovered either by converting watered out wells to artificial lift or by infill drilling.

What can go wrong ?:

What can go wrong ? Gas & Water Injection There is a possibility that the aquifer may at some time be unable to supply water for injection purpose because of pressure drop or degradation of quantity. However 30 years of water supply from the aquifer have shown no indication. Master plan contains a strategy to use produced water as an alternate source to mitigate the problem.

What can go wrong ?:

What can go wrong ? Artificial Lift Add significant gas volumes. Can create slugging conditions. Slugging can cause the liquid handling problem. Instability of one well can be transferred to other well through pressure fluctuation. If we decide to use the rich gas instead of a lean gas for gas lift injection this will cause the condensate drop out in the gas lift distribution line. Possible mitigation is to create a mixture of the rich associated gas with the lean gas from another gas processing sister company.

What can go wrong ?:

What can go wrong ? Well Bore & Facility Integrity Well bore integrity is the major concern deals with a number of hazards that can occur including Down hole corrosion due to increasing water cuts. Stimulation practices Ineffective / proper inhibition fluid. Risk of Equipment failure specially CDS (Central Degassing Station) Pipeline Corrosion. Ensuring quality of materials. Appropriate cement & Casing designs. ADCO already has a corporate programmed & policy to inspect & repair well.

What can go wrong ?:

What can go wrong ? Gas Processing Gas processing is an important issue handled by ADCO sister company Volume of gas available to & fro from the gas processing (300 – 400 mmscf /day) Gas Composition H 2 S Concentration

Economic Analysis:

Economic Analysis

Economic Analysis:

Economic Analysis

Consequences of not Embarking on Project:

Consequences of not Embarking on Project Increasing well bore integrity issues. Leaving oil behind as wells are side tracked or abandoned prematurely. Need for redrilling to achieve ultimate recovery. Increasing OPEX Premature drilling expenditure Loose Synergy


Conclusion The event provided to ADCO the documents needed to put together TOR for the facility concept selection. The Feed & concept selection was completed by 2005. The field’s production plateau can no longer be sustained with drilling alone. This development scheme can only be achieved through combination of infill drilling, increasing/optimizing horizontal well rate, and the phased implementation of a field wide artificial lift program.

Double Plugging Anticline If the fold hinge has dip on both sides is called double plunge fold. :

Double Plugging Anticline If the fold hinge has dip on both sides is called double plunge fold.

Questions ?:

Questions ?

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