FLUID PROPERTIES

PHASE
1. any homogenous (all liquid, solid or gas) part of system separated from other parts by definite boundary surface
2. eg: ice water: 2 phase (l+g)
3. PHASE BEHAVIOR
  1. P-T diagram
    1. describe phase behavior (equilibria) betw. phases as changes P,V,T of system
    2. single component
      1. SUBLIMATION curve (s-g), VAPOR PRESS curve (l-g)
      2. CRITICAL POINT
        critical temp
        at higher temp than critical temp, incr. press will not liquefy gas
        critical press
        at higher press than criticalpress, incr. temp can't coexist gas & liquid
      3. TRIPLE POINT
        temp, press which liquid, solid, gas coexist under equilibrium condition
    3. two-component
      1. BUBBLE POINT curve: down first bubble gas formed
      2. DEW POINT curve: up first liquid drop form
      3. CRITICAL POINT: bubble point & dew point curves meet, all properties of liquid & gas are identical
      4. CRICONDENBAR: max. press on curves, above always liquid
      5. CRICONDENTHERM: max.temp on curves, always gas
      6. QUALITY line: temp & press for equal V of liquids, show ratio liquid:gas
  2. conditions of temp & Press for which different phase exist
  3. Subcooled/compressed liquid: liquid phase that has pressure higher than vapour pressure (above vapour press curve)
  4. Superheated Vapor: gas phase that has higher temp than vapor temp (below vapor press curve)
PURE SUBSTANCES
1. uniform&invariable in chemical composition
2. can exist in >1 phase but each phase must have same chemical composition
3. eg: ice water is a pure substance with 2 phases
SYSTEM: what we want to study
1. CLOSED SYSTEM
  1. no mass loss from system
2. ISOLATED SYSTEM
  1. no energy lose from system
3. system condition described by its properties
  1. eg: condtion STATE described by p,V, T
SURROUNDINGS: everything external to system
BOUNDARY: separate system from surroundings
PHYSICAL PROPERTIES
1. INTENSIVE
  1. independent of quantity of material presented (p,Temp,press)
2. EXTENSIVE
  1. dependent of quantity of material presented (V, mass)
COMPOSITION
1. C-4:$$$, C-7: cheap
RESERVOIR FLUID TYPES
1. decide factors: sampling, prediction, calculation, recovery method, type/size equipment, depletion plan
2. confirmed by: lab observations, production info
3. determined by fluid properties: initial production GOR, gravity & colour of stock-tank fluid
4. Oil reservoir
  1. reservoir temp < critical temp
  2. UNDERSATURATED: can dissolve more gas, > bubble-point press
  3. SATURATED: can't dissolve more gas, =bubble point press
  4. GAS-CAP/2-PHASE: <bubble point press
  5. HEAVY oil (BLACK)
    1. equally spaced quality line, brown/dark green
  6. Light oil ( VOLATILE)
    1. closer-wider down quality line, green/orange
5. Gas reservoir
  1. reservoir temp > critical temp
  2. RETROGRADE CONDENSATE gas
    1. closer-wider right quality line, >gas as press decr, white/colour liquid in stock-tank
  3. WET gas
    1. white liquid in stock-tank
  4. DRY gas
    1. only gas in tank/ water
decr. temp& press - decr. VISCOSITIES fluid
COMPRESSIBILITY
1. decr. press - compress effect gas cap, compaction drive

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	Creado por Hoa Truong hace alrededor de 9 años