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Intelligent well completion

  1. Intelligent well completion Made by- Akshaya kumar mishra Roll no.- 14MPE12
  2. OUTLINE • Introduction • What are well completions? • What is intelligent well completion? • Reasons for Intelligent well completion • Components • Applications • Well control during IWC installation • Case study • Advantages/Disadvantages of Intelligent well completion over conventional completions • Conclusion • References
  3. Introduction • Through the years different types of processes have been used to complete and produce oil from reservoirs after drilling. • Demand for processes which maximize the recoverable reserves while reducing costs due to intervention has been on the increase which has brought about the latest well completion technique which is INTELLIGENT WELL COMPLETION (IWC). • This presentation therefore is to help acquaint us with this process.
  4. What is well completion? • This is a process of making a well ready for production or(injection), this principally involves preparing the bottom of the hole to the required specifications, running in the production tubing and its associated downhole tools, as well as perforating and stimulating as required. • Sometimes the process of running in and cementing the casing is also included.
  5. What is intelligent well completion? • An intelligent well is a permanent system capable of collecting, transmitting, and analyzing wellbore production and reservoir and completion integrity data, and enabling remote action to better control reservoir, well, and production processes. • IWC can be explained as the type of completion that is based on the strategy of using REAL TIME well monitoring and closed loop capability to maximize the final recovery of reserves. • This is achieved by running gauges downhole to study REAL TIME data per zone in order to make pro active(preventive) rather than reactive(corrective) decisions.
  6. Reasons for intelligent well completion The instances in which IWC’s are suitable for are thus- COMMINGLED PRODUCTION • Some fields have two or more reservoirs that could be produced at the same time (usually at different depths) but these reservoirs could have different petro physical properties, fluid characteristics and/or different pressures. INJECTION PROFILE ISSUES • Due to the subdivision by some Fluid units inside the same reservoir with different petro physical properties, differential depletion occurs (some flow units deplete faster than others) during the production process or differential replacement occurs (some fluids units build up their pressure faster than others), when injecting fluids for pressure support. DUMP FLOOD STRATEGIES • Enhanced Oil Recovery (EOR) strategies are among the most complex , successful but expensive methods for maximizing final recovery of reserves. Reducing costs in these projects is highly desirable.
  7. Components
  9. Well Control during IWC installation • IWCs are typically installed without a reservoir isolation barrier (eg FIV) • String motion generated from rig heave can induce to a well influx Main parameters affecting the swabbing effect: - Rig motion (heave and amplitude) - Completion design: Flow paths across the completion - Clearances: flow areas open to fluid movement - Wellbore Fluid viscosity Pswab < Pres risk of well influx Looking for other Operator’s experience
  10. Well Control during IWC installation Run In hole 9-5/8" Production Packer 7" Isolation Packer #4 7" Isolation Packer #3 7" Isolation Packer #2 7" Isolation Packer #1 Upward string movement can swab the formation gas Wellbore Influx 9-5/8" Production Packer 7" Isolation Packer #4 7" Isolation Packer #3 7" Isolation Packer #2 7" Isolation Packer #1 Annulus isolation with control lines across could be problematic gas Well Killing 9-5/8" Production Packer 7" Isolation Packer #4 7" Isolation Packer #3 7" Isolation Packer #2 7" Isolation Packer #1 Can we kill all the zones effectively and proceed landing the completion? gas Kill fluid
  11. Well Control during IWC installation 95 psi 150 psi 4 Zone SMART in Viscous polymer 95 psi 150 psi 4 Zone SMART in Viscous polymer • Swabbing effect is greater for 3+ zone completions • Risk is higher for gas wells Risk Mitigations: • Running Speed • Increase overbalance • Packer Clearance • Control fluid viscosity • Impose rig heave restrictions
  12. Marine Riser Seabed Sea Level Rig Floor BOP D ME LE UE Marine Riser Tensioners SFT Surface Flow Tree THRT Tubing Hanger Smart completion Surface Downhole Potential for swabbing the formation Reservoir communication during completion installation Well Control during IWC installation
  13. Case study • Flexibility of eRED® valve aids success of acid stimulation operation • Asia: Swellpacker System and Gravel Pack Enable Zonal Isolation in OH SmartWell Completion • Kuwait’s first multilateral intelligent completion results in a cost effective field management solution • Successful Auto Gas-Lift Using Intelligent Completion Boosted Oil Production • Intelligent Completion Technology Enables Selective Injection and Production in Mature Field Offshore China
  14. Intellizone Compact Modular System 1. Integrated Assembly 2. Downhole assembly include- Packer, Handling Sub, an flow control valve(FCV) 3. Each assembly tested at the factory. 4. Using frequency shift keying (FSK) , data is transmitted to surface, system monitors downhole pressure, temperature, and valve position every second. 5. Data transmitted to surface via mono- conductor single cable. 6. Hydraulic Control unit controls all hydraulic line fluid outflow, inflow and pressures required to actuate downhole flow.
  15. Case 2 savings in india • India’s offshore operator decide to complete three zone well within economic restraints of a marginal field. They sought to reduce CAPEX by using already purchased equipment and optimum return on their investment through control of each zone independently. • Completion choices- Sliding sleeves and Surface Controlled downhole flow control system. • Problem- 1. Sliding sleeve requires interventions to shift them and to bring these wells online they would have to perform coiled tubing-conveyed acid treatments across each zone individually. 2. Treating all zones at once would have result in most of acid entering in one permeable zone and leaving the other two untreated. 3. Its not possible to isolate each zone using SCSFS because three have required more hydraulic lines than existing penetrations in company own wellhead.
  16. ADVANTAGES/DISADVANTAGES OF IWC’S(CHOKING CAPABILITY) ADVANTAGES; • Total control of production or injection profiles. • No cross flow between different zones. • Real-time monitoring of different zones. • Control valves can be activated remotely. • Well test can be performed without intervention. • Operations associated with production or injection optimization can be performed online (closed loop). • Does not require maintenance. DISADVANTAGE; • Completion cost is higher than mechanical systems.
  17. Conclusion • It is obvious that IWC offers flexibility and reliability, but the most important aspect of this technology is its ability to adapt to changing well conditions, whether these changes are part of a planned reservoir exploitation strategy or an unplanned event. • It is important to note that an IWC is the key component of an exploitation strategy to maximize final recovery of reserves through maximum control, real time monitoring and closed loop capability. • Finally, IWC can help operators make the right decision at the right time by reducing uncertainty levels.
  18. Refrences • Halliburton WellDynamics Catalogue • Kevin Beveridge et al: ‘Intelligent completions at the ready’, Oilfield Review autumn 2011, pp.18-27 • Mike Robinson, Energy Development Partners Ltd. ‘Chapter 3 – Intelligent Well Completions’, Vol. IV Emerging and Peripheral Technologies, 2007,SPE • Saeed Mubarak : ‘Lessons Learned from 100 Intelligent Wells Equipped with Multiple Downhole Valves’, ’The Journal of Saudi Aramco Technology’, Fall 2009, pp.2-7 • completions/intelligent-completions/ id=hfqel9vs&nav=en-US_completions_public, accessed at 18/09/2013 at 12.05 am