Page 192 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

176 Gas Wettability of Reservoir Rock Surfaces with Porous Media

(A) (B)

(C)
FIGURE 5.11
Front shape of gas-displacing-oil in capillaries having different gas wettability. (A) Nongas-wetting (convexity, θ gas 5 141.63
degrees), (B) nongas-wetting (convexity, θ gas 5 137.91 degrees), (C) nongas-wetting (convexity, θ gas 5 129.13 degrees).

5.2.1 Preparation and Experiment Method for Etched Glass
Network Models
In 1961, Mattax and Kyte [1] reported an improved method by observing the
details of micron displacement, and prepared the first etched glass network
model. Later, this method was greatly improved by Davis and Jones [2]
through photographic technology. The etched glass network model is one of
the most common methods reported in literature so far for preparing micro
models.

5.2.1.1 PREPARING ETCHED GLASS NETWORK MODEL
Preparing micro models has two aspects: plate making and model preparation.
The process of preparing etched glass network model is as follows (Fig. 5.12).

5.2.1.1.1 Preparing Primary Motherboards (Simulation
Model Version)
Representative core slices are selected and photos of representative pores are
taken through a camera. Pores and network profiles are clarified after proces-
sing with graphic processing software.

In addition, the primary motherboards of ideal models of different pore-
throat rate, different rhythm, different pore-networks, and different pore-
throat coordination relations, etc., are made artificially.