Subjects: Mine Engineering Technology >> Development Engineering of Oil and Gas Well Subjects: Mechanics >> Hydromechanics submitted time 2021-01-06
Abstract: Jump interface in porous media exists widely in oil and gas reservoirs during development. The traditional seepage theory holds that the pressure and Darcy velocity are continuous at the discontinuous interface, and we have falsified them in previous studies. In this paper, taking gas-water phase as an example and considering the compressibility of the fluids, the connection conditions of phase pressures and Darcy velocities at the immovable jump interface are established. The results show that :(1) the total pressure is always continuous, but the phase pressure of each phase can be discontinuous;(2) The total Darcy velocity at the both sides are equal, but the phase Darcy velocity probably discontinuous;(3) The connection conditions of fixed jump interface do not comfort to Rankine - Hugoniot conditions, which are different from mobile jump interface, i.e. flood front.
Peer Review Status:Awaiting Review
Subjects: Mine Engineering Technology >> Development Engineering of Oil and Gas Well Subjects: Mechanics >> Hydromechanics submitted time 2020-12-25
Abstract: Gas-liquid two-phase displacement are widely observed in oil and gas reservoir. The traditional seepage theory holds that the phase pressures and Darcy velocities must be continuous at the jump interface, and we have falsified them in previous studies. In this paper, the jump interface condition of two-phase seepage is extended from incompressible fluids to compressible. Taking gas-water displacement as an example, the new connection conditions of phase pressures and Darcy velocities at the gas-water displacement front in porous media were built. The results show that at the flood front, the global pressure is continuous, but not the fluid pressure are. (2) The total Darcy velocity can be discontinuous with a specific functional relationship;(3) The phase Darcy velocity of each phase of the fluid is discontinuous.
Peer Review Status:Awaiting Review