Thermodynamic analysis of transient two-phase flow in oil and gas reservoirs
A new method of analysis of a flowing well has been developed in this study. The method employs a thermodynamic property known as the Availability Function. The advantage of the availability function method of analysis is that it allows for the calculation of the thermodynamic efficiency of all processes, including not only those that are large work producers or consumers but also those that do not have work production or consumption as their goal. In order to simulate the fluid flow behavior, a transient, two-phase flow model was developed in both the reservoir and the wellbore. The flow in the wellbore was assumed to be one-dimensional while a radial flow was assumed for the reservoir system. The equations governing the fluid flow behavior in both systems are (1) mass, (2) momentum, (3) energy, and (4) entropy balance equations. The wellbore model includes heat transfer in the wellbore and heat conduction in the formation. Finite difference approximation was used in solving the fluid flow equations. The model developed in this study is capable of handling a single component, single phase (oil or gas) or two-phase (oil and gas) flow. The fluid flow equations provide the thermodynamic properties - energy, enthalpy, entropy, density - and the fluid velocity for use in the calculations of the maximum reversible (theoretical possible) work, the useful energy utilized in the lifting of the hydrocarbon fluid from the bottom of the well to the surface and the energy lost due to irreversibilities. The thermodynamic derivatives and phase properties were predicted by using the multi-parameter equation of state which was a modification of the BWR equation of state of Lee and Kesler.
- Research Organization:
- Oklahoma Univ., Norman (USA)
- OSTI ID:
- 5600703
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
NATURAL GAS WELLS
FLOW MODELS
THERMODYNAMIC MODEL
OIL WELLS
ASSOCIATED GAS
EFFICIENCY
ENERGY BALANCE
ENTHALPY
ENTROPY
EQUATIONS OF STATE
FINITE DIFFERENCE METHOD
FLUID FLOW
HEAT TRANSFER
MASS BALANCE
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PRODUCTION
TWO-PHASE FLOW
ENERGY TRANSFER
EQUATIONS
FLUIDS
GASES
GEOLOGIC DEPOSITS
ITERATIVE METHODS
MATHEMATICAL MODELS
MINERAL RESOURCES
NUMERICAL SOLUTION
PARTICLE MODELS
PHYSICAL PROPERTIES
RESOURCES
STATISTICAL MODELS
THERMODYNAMIC PROPERTIES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing