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Reserves
- 1. Classification Of Reserves by SYED NAWAZ M.Tech Petroleum Exploration and Production Delta Studies Institute, Andhra University
- 2. Content • Introduction • Reserve • Recoverable Reserves • Types of reserves • Proved • Proved Sub-Economics • Inferred Reserves
- 3. Introduction • Reservoir: rock having sufficient porosity and permeability to store and transmit fluids. • Resource: Known to be the proof of Crude Oil • Reserves: Can be produce or extract commercially • Ultimate oil recovery depends on reservoir rock properties, fluid properties, current oil prices, and reservoir heterogeneities. • Reserves overview: classification is based on various factor 1- Based on recovery method • Primary reserves (crude can be produce by primary recovery) • Secondary reserves (can be produced by secondary recovery) • Tertiary reserves (produced by EOR)
- 4. Primary reserves classification • Sub categorized in 3 types based on degree of certainty: • Proved : can be produced (dc is greater then 65%) • Probable: can be produced (dc greater than 50%) • Possible: below 10% certainty
- 5. Proved Reserves Classification • Based on their productivity status. Proved Reserves are classified into 3 types: 1- Developed 2- Developed-Non-Producing 3- Un-Developed
- 6. Reserves • Reserves = petroleum initially in place * estimated recovery factor • Recovery factor is defined as the ratio of recoverable oil volume over original oil in place • Recovery factor of an oil reservoir can be expressed in terms of formation volume factors and saturations • Saturation : pore volume occupied by a particular fluid in the presence of other fluids. • Formation volume factor : It is the ratio between the space occupied by a barrel of oil containing solution gas at reservoir conditions and a barrel of dead oil at surface conditions
- 7. Saturation classification • Based on fluids: • Oil saturation, Gas saturation, and water saturation • Connate saturation: the saturation that cannot be recoverable by any of recovery methods and it always remains in reservoir • Irreducible saturation: • Movable saturation= 1-Swc-Soc • Residual saturation: • The fluids remains after primary recovery mechanism • Critical saturation: • Minimum saturation required for a oil to flow
- 8. Methods for estimating reserves • Volumetric method • Performance method • Analogy/Statistical method • Combination method • Reconcilation between methods
- 9. Queries?
- 10. References • Tarek ahmed • L.P.Dake • Rigzone • SPE