Page 194 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

178 Gas Wettability of Reservoir Rock Surfaces with Porous Media

5. Developing
In the darkroom, after photoetching, the glass was clamped with pli-
ers and developed in a negative glue developer for about 40 seconds. It
was then placed in a negative cleaning agent and washed for about
20 seconds. After that, it was placed under a microscope to observe the
photoetching effect.
6. Postbaking
The developed model was placed in the chuck and then in an oven

at 140 C for 30 minutes.
7. Waxing and corrosion
When the baked glass slide cooled, the part around the slide and
the part without glue film protection were coated with fused industrial
wax for corrosion protection. Then, the glass slide was put in an HF
solution to corrode for a period of time (the corrosion time is about
40 seconds).
8. Washing
Paraffin wax on the corroded model was removed with knives, and
then residual gum and paraffin wax were washed with petroleum
ether. They can also be boiled and removed using deionized water.
9. Mill grooving
The inlet and outlet of washed models were polished with a grind-
ing machine. The size of length, width, and depth of the groove must
conform to the length and diameter of fluid inlet pipes.
10. Model sintering
The model was cleaned with absorbent cotton or absorbent gauze.
The negative film was aligned with the cover slip, and was then stuck
with adhesive tape and fixed. A tile with flat surface was placed in a
high-temperature furnace. A piece of cotton paper was placed on the
tile, and the stuck glass sheet was placed into the high-temperature
furnace. The temperature was set and maintained for more than
30 minutes.
11. Bonding of the inlet and outlet pipe of models
The inlet and outlet pipes were first inserted into the two ends of
the model. The binder was placed inside the inlet pipe of the model,
optimally up to one third to two thirds of the way, before the model
was laid flat on the paper to solidify the binder.

5.2.1.1.4 Process of Displacement Experiment
The peristaltic pump and micro model were connected. The micro model was
placed under the stereo microscope for the displacement experiment. The
microscopic image of the entire displacing process was transmitted to a com-
puter with the camera connected to the stereo microscope for measurement
and characterization of displacing characteristics.