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ABSTRACT: Regularities in Movement of Subsurface Condensated Fluids

A. G. Arye

Darcy's law is traditionally considered to be a major filtration law. However, molecular and kinetic analyses of fluid movement in a porous medium with regard for physical interaction between liquids and rocks enabled me to derive a new, more general law:


where: V = filtration rate, J = head gradient, Jo = initial filtration gradient of Ko = V with J Jo, i.e., Darcy's permeability coefficient.

With J > Jo, this law is transformed into Darcy's law. With J = Jo, filtration stops as any multi-molecular liquid flow, and with J < Jo, it is transformed into an individual molecular movement called filling. Filling rate is determined using the law V = ^lgrJ, where ^lgr is filling coefficient.

The concept of initial filtration gradient gets a new interpretation. It is now considered as gradient with which pore-liquid movement is transformed from filtration type to a filling one.

These regularities are important in evaluating subsurface fluid movement in the original environments or at some distance from exciting wells. In particular, it is found that pore-liquid flow in a natural environment is of filling type, and during this process separation of solution ingredients occurs.

Final sizes of a depression cone of a functioning well or mine are controlled by existence of interactions between water and rock.

AAPG Search and Discovery Article #91003©1990 AAPG Annual Convention, San Francisco, California, June 3-6, 1990