Stepping on Development of Small and Medium Size Oilfields through Horizontal Wells- The Way Ahead
- Raj Deo Tewari (Greater Nile Petroleum Operating Co) | Mirghani Mohamed Malik (Petronas Carigali Sdn Bhd) | Sivaraman Naganathan (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil & Gas Conference and Exhibition, 11-13 September, Adelaide, Australia
- Publication Date
- Document Type
- Conference Paper
- 2006. Society of Petroleum Engineers
- 3.1.2 Electric Submersible Pumps, 1.1 Well Planning, 4.1.5 Processing Equipment, 1.6.10 Running and Setting Casing, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 2 Well Completion, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 1.8 Formation Damage, 1.6.7 Geosteering / Reservoir Navigation, 5.5.5 Evaluation of uncertainties, 2.7.1 Completion Fluids, 1.12.5 Real Time Data Transmission, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 1.12.6 Drilling Data Management and Standards, 4.6 Natural Gas, 5.1.1 Exploration, Development, Structural Geology, 5.4.6 Thermal Methods, 2.4.5 Gravel pack design & evaluation, 1.6.2 Technical Limit Drilling, 5.6.1 Open hole/cased hole log analysis, 3.1 Artificial Lift Systems, 1.6.1 Drilling Operation Management, 3.3 Well & Reservoir Surveillance and Monitoring, 5.1.5 Geologic Modeling, 3.2.5 Produced Sand / Solids Management and Control, 3 Production and Well Operations, 5.1.2 Faults and Fracture Characterisation, 1.6.6 Directional Drilling, 1.6 Drilling Operations, 3.2.6 Produced Water Management, 5.4.2 Gas Injection Methods, 4.2.3 Materials and Corrosion, 3.1.7 Progressing Cavity Pumps, 1.12.1 Measurement While Drilling, 1.2.3 Rock properties, 5.1 Reservoir Characterisation, 2.3 Completion Monitoring Systems/Intelligent Wells, 2.4.3 Sand/Solids Control, 2.2.2 Perforating, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 5.8.7 Carbonate Reservoir, 5.5.11 Formation Testing (e.g., Wireline, LWD), 1.14 Casing and Cementing, 1.12.2 Logging While Drilling, 7.4.3 Market analysis /supply and demand forecasting/pricing, 4.1.2 Separation and Treating
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Maximization of recovery from anisotropic small and medium size oil fields is a daunting task for operators. Development strategies and concepts implemented in large fields generally are not appropriate for small and medium size fields. Inappropriate strategies and methodologies of exploitation affect the overall recoveries and economics of the project. This is further complicated in tight, viscous and sand incursion prone formations. This paper discusses about number of small fields located in Muglad basin wherein oil accumulation is found in multiple layers of late cretaceous deposits. The formations are heterogeneous, unconsolidated with higher viscosity and strong aquifer support. Some formations are tighter too. Field performance is marred by exponential rise of water cut due to adverse mobility and lifting through ESP. Production is affected due to poor influx in tighter formations through conventional wells. This behavior is limiting the producing life of existing wells, resulting into decline in production and causing significant bypassed and undrained oil.
Horizontal wells with state-of-art completion both in openhole and cased holed with suitable artificial lift techniques were considered as one of the IOR option for maximizing well productivity in these thinly bedded heavy oil field with objective for tapping the bypassed oil and delaying the water production while controlling the sand production.
This paper discusses about the challenges in planning and executing cycles of real time well site well placement, completion, perforation and artificial lift selection. Lessons learnt and results of the well placement along with cost/production analysis will be presented. Production results to date have been remarkable with productivity improvement factor varying 3-4 folds compared to vertical wells. The paper illustrates how integration of different disciplines with focused efforts led to successful well placement, sand and water management in heavy oil environment and also oil production from tight formations.
Oil continues to be the world's major energy resource, accounting nearly 40% of primary energy demand. Its occurrence is widespread in all the continents. Commercial oil discoveries have been made in quite large number of countries but these reserves are unevenly distributed and bulk of reserves is located in Middle East countries. They hold nearly half of the world's known reserves. Oil industry has progressed tremendously since its inception. Technological development has impacted all gamut of activities viz exploration and production in substantial manner. General technological development in all walks of life resulting in continuous increase in oil demand, rise in oil prices, and geopolitical reasons have necessitated the technological breakthrough's in understanding of the reservoir complexities and behaviour and this has resulted into a more integrated approach to the management of the existing hydrocarbon resources and producing assets. Continual advancement/improvement in oil & gas exploration and exploitation practices and better reservoir management has led the industry in maximization of the recovery from producing fields and from new oil discoveries too. Most important is continuous reduction of lifting cost by introducing new technologies. These technologies have reduced the finding cost through better exploration and appraisal techniques, better drilling and completion practices and have also helped in accelerating the production from mature fields.
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